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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2008-2013, fluid Operations AG<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * FedX is free software: you can redistribute it and/or modify<a name="line.4"></a>
<span class="sourceLineNo">005</span> * it under the terms of the GNU Affero General Public License as<a name="line.5"></a>
<span class="sourceLineNo">006</span> * published by the Free Software Foundation, either version 3 of the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * License, or (at your option) any later version.<a name="line.7"></a>
<span class="sourceLineNo">008</span> * <a name="line.8"></a>
<span class="sourceLineNo">009</span> * This program is distributed in the hope that it will be useful,<a name="line.9"></a>
<span class="sourceLineNo">010</span> * but WITHOUT ANY WARRANTY; without even the implied warranty of<a name="line.10"></a>
<span class="sourceLineNo">011</span> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the<a name="line.11"></a>
<span class="sourceLineNo">012</span> * GNU Affero General Public License for more details.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * <a name="line.13"></a>
<span class="sourceLineNo">014</span> * You should have received a copy of the GNU Affero General Public License<a name="line.14"></a>
<span class="sourceLineNo">015</span> * along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>package com.fluidops.fedx.util;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.io.BufferedReader;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.io.FileNotFoundException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.io.FileReader;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.io.IOException;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.ArrayList;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.HashSet;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.LinkedHashSet;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.List;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.Set;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.log4j.Logger;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.openrdf.model.BNode;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.openrdf.model.Literal;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.openrdf.model.Resource;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.openrdf.model.URI;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.openrdf.model.Value;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.openrdf.model.impl.ValueFactoryImpl;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import org.openrdf.query.BindingSet;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import org.openrdf.query.algebra.StatementPattern;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import org.openrdf.query.algebra.Var;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import org.openrdf.query.impl.EmptyBindingSet;<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>import com.fluidops.fedx.algebra.ExclusiveGroup;<a name="line.42"></a>
<span class="sourceLineNo">043</span>import com.fluidops.fedx.algebra.ExclusiveStatement;<a name="line.43"></a>
<span class="sourceLineNo">044</span>import com.fluidops.fedx.algebra.FedXStatementPattern;<a name="line.44"></a>
<span class="sourceLineNo">045</span>import com.fluidops.fedx.algebra.FilterValueExpr;<a name="line.45"></a>
<span class="sourceLineNo">046</span>import com.fluidops.fedx.algebra.IndependentJoinGroup;<a name="line.46"></a>
<span class="sourceLineNo">047</span>import com.fluidops.fedx.algebra.StatementTupleExpr;<a name="line.47"></a>
<span class="sourceLineNo">048</span>import com.fluidops.fedx.evaluation.SparqlFederationEvalStrategyWithValues;<a name="line.48"></a>
<span class="sourceLineNo">049</span>import com.fluidops.fedx.evaluation.iterator.BoundJoinVALUESConversionIteration;<a name="line.49"></a>
<span class="sourceLineNo">050</span>import com.fluidops.fedx.exception.FilterConversionException;<a name="line.50"></a>
<span class="sourceLineNo">051</span>import com.fluidops.fedx.exception.IllegalQueryException;<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span>/**<a name="line.53"></a>
<span class="sourceLineNo">054</span> * Various static functions for query handling and parsing.<a name="line.54"></a>
<span class="sourceLineNo">055</span> * <a name="line.55"></a>
<span class="sourceLineNo">056</span> * @author Andreas Schwarte<a name="line.56"></a>
<span class="sourceLineNo">057</span> */<a name="line.57"></a>
<span class="sourceLineNo">058</span>public class QueryStringUtil {<a name="line.58"></a>
<span class="sourceLineNo">059</span>        <a name="line.59"></a>
<span class="sourceLineNo">060</span>        /* TODO make operations more performant, i.e. use same instance of StringBuilder more permanently */<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span>        public static Logger log = Logger.getLogger(QueryStringUtil.class);<a name="line.62"></a>
<span class="sourceLineNo">063</span>        <a name="line.63"></a>
<span class="sourceLineNo">064</span>        /**<a name="line.64"></a>
<span class="sourceLineNo">065</span>         * A dummy URI which is used as a replacement for {@link BNode}s in {@link #appendBNode(StringBuilder, BNode)}<a name="line.65"></a>
<span class="sourceLineNo">066</span>         * since BNodes cannot be expressed in SPARQL queries<a name="line.66"></a>
<span class="sourceLineNo">067</span>         */<a name="line.67"></a>
<span class="sourceLineNo">068</span>        public static final URI BNODE_URI = ValueFactoryImpl.getInstance().createURI("http://fluidops.com/fedx/bnode");<a name="line.68"></a>
<span class="sourceLineNo">069</span>        <a name="line.69"></a>
<span class="sourceLineNo">070</span>        /**<a name="line.70"></a>
<span class="sourceLineNo">071</span>         * returns true iff there is at least one free variable, i.e. there is no binding<a name="line.71"></a>
<span class="sourceLineNo">072</span>         * for any variable<a name="line.72"></a>
<span class="sourceLineNo">073</span>         * <a name="line.73"></a>
<span class="sourceLineNo">074</span>         * @param stmt<a name="line.74"></a>
<span class="sourceLineNo">075</span>         * @param bindings<a name="line.75"></a>
<span class="sourceLineNo">076</span>         * @return<a name="line.76"></a>
<span class="sourceLineNo">077</span>         */<a name="line.77"></a>
<span class="sourceLineNo">078</span>        public static boolean hasFreeVars(StatementPattern stmt, BindingSet bindings) {<a name="line.78"></a>
<span class="sourceLineNo">079</span>                for (Var var : stmt.getVarList()) {<a name="line.79"></a>
<span class="sourceLineNo">080</span>                        if(!var.hasValue() &amp;&amp; !bindings.hasBinding(var.getName()))<a name="line.80"></a>
<span class="sourceLineNo">081</span>                                return true;    // there is at least one free var                               <a name="line.81"></a>
<span class="sourceLineNo">082</span>                }<a name="line.82"></a>
<span class="sourceLineNo">083</span>                return false;<a name="line.83"></a>
<span class="sourceLineNo">084</span>        }<a name="line.84"></a>
<span class="sourceLineNo">085</span>        <a name="line.85"></a>
<span class="sourceLineNo">086</span>                <a name="line.86"></a>
<span class="sourceLineNo">087</span>        /**<a name="line.87"></a>
<span class="sourceLineNo">088</span>         * Return a string representation of this statement using the following pattern, where<a name="line.88"></a>
<span class="sourceLineNo">089</span>         * variables are indicated using ?var and values are represented as strings.<a name="line.89"></a>
<span class="sourceLineNo">090</span>         * <a name="line.90"></a>
<span class="sourceLineNo">091</span>         * Pattern: {s; p; o} <a name="line.91"></a>
<span class="sourceLineNo">092</span>         * <a name="line.92"></a>
<span class="sourceLineNo">093</span>         * @param stmt<a name="line.93"></a>
<span class="sourceLineNo">094</span>         * @return<a name="line.94"></a>
<span class="sourceLineNo">095</span>         */<a name="line.95"></a>
<span class="sourceLineNo">096</span>        public static String toString(StatementPattern stmt) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>                StringBuilder sb = new StringBuilder();<a name="line.97"></a>
<span class="sourceLineNo">098</span>                sb.append("{");<a name="line.98"></a>
<span class="sourceLineNo">099</span>                appendVar(sb, stmt.getSubjectVar(), new HashSet&lt;String&gt;(), EmptyBindingSet.getInstance());<a name="line.99"></a>
<span class="sourceLineNo">100</span>                sb.append("; ");<a name="line.100"></a>
<span class="sourceLineNo">101</span>                appendVar(sb, stmt.getPredicateVar(), new HashSet&lt;String&gt;(), EmptyBindingSet.getInstance());<a name="line.101"></a>
<span class="sourceLineNo">102</span>                sb.append("; ");<a name="line.102"></a>
<span class="sourceLineNo">103</span>                appendVar(sb, stmt.getObjectVar(), new HashSet&lt;String&gt;(), EmptyBindingSet.getInstance());<a name="line.103"></a>
<span class="sourceLineNo">104</span>                sb.append("}");<a name="line.104"></a>
<span class="sourceLineNo">105</span>                return sb.toString();<a name="line.105"></a>
<span class="sourceLineNo">106</span>        }<a name="line.106"></a>
<span class="sourceLineNo">107</span>        <a name="line.107"></a>
<span class="sourceLineNo">108</span>        public static String toString(Var var) {<a name="line.108"></a>
<span class="sourceLineNo">109</span>                if (!var.hasValue())<a name="line.109"></a>
<span class="sourceLineNo">110</span>                        return "?" + var.getName();<a name="line.110"></a>
<span class="sourceLineNo">111</span>                return getValueString(var.getValue());<a name="line.111"></a>
<span class="sourceLineNo">112</span>        }<a name="line.112"></a>
<span class="sourceLineNo">113</span>        <a name="line.113"></a>
<span class="sourceLineNo">114</span>        <a name="line.114"></a>
<span class="sourceLineNo">115</span>        /**<a name="line.115"></a>
<span class="sourceLineNo">116</span>         * Return a string representation of this statement using the following pattern, where<a name="line.116"></a>
<span class="sourceLineNo">117</span>         * variables are indicated using ?var and values are represented as strings.<a name="line.117"></a>
<span class="sourceLineNo">118</span>         * <a name="line.118"></a>
<span class="sourceLineNo">119</span>         * Pattern: {s; p; o} <a name="line.119"></a>
<span class="sourceLineNo">120</span>         * <a name="line.120"></a>
<span class="sourceLineNo">121</span>         * @param stmt<a name="line.121"></a>
<span class="sourceLineNo">122</span>         * @return<a name="line.122"></a>
<span class="sourceLineNo">123</span>         */<a name="line.123"></a>
<span class="sourceLineNo">124</span>        public static String toString(Resource subj, URI pred, Value obj) {<a name="line.124"></a>
<span class="sourceLineNo">125</span>                return toString(QueryAlgebraUtil.toStatementPattern(subj, pred, obj));<a name="line.125"></a>
<span class="sourceLineNo">126</span>        }<a name="line.126"></a>
<span class="sourceLineNo">127</span>        <a name="line.127"></a>
<span class="sourceLineNo">128</span>        <a name="line.128"></a>
<span class="sourceLineNo">129</span>        /**<a name="line.129"></a>
<span class="sourceLineNo">130</span>         * Construct a SELECT query for the provided statement. <a name="line.130"></a>
<span class="sourceLineNo">131</span>         * <a name="line.131"></a>
<span class="sourceLineNo">132</span>         * @param stmt<a name="line.132"></a>
<span class="sourceLineNo">133</span>         * @param bindings<a name="line.133"></a>
<span class="sourceLineNo">134</span>         * @param filterExpr<a name="line.134"></a>
<span class="sourceLineNo">135</span>         * @param evaluated<a name="line.135"></a>
<span class="sourceLineNo">136</span>         *                      parameter can be used outside this method to check whether FILTER has been evaluated, false in beginning<a name="line.136"></a>
<span class="sourceLineNo">137</span>         * <a name="line.137"></a>
<span class="sourceLineNo">138</span>         * @return<a name="line.138"></a>
<span class="sourceLineNo">139</span>         * @throws IllegalQueryException<a name="line.139"></a>
<span class="sourceLineNo">140</span>         *                              if the query does not have any free variables<a name="line.140"></a>
<span class="sourceLineNo">141</span>         */<a name="line.141"></a>
<span class="sourceLineNo">142</span>        public static String selectQueryString( FedXStatementPattern stmt, BindingSet bindings, FilterValueExpr filterExpr, Boolean evaluated) throws IllegalQueryException {<a name="line.142"></a>
<span class="sourceLineNo">143</span>                <a name="line.143"></a>
<span class="sourceLineNo">144</span>                Set&lt;String&gt; varNames = new HashSet&lt;String&gt;();<a name="line.144"></a>
<span class="sourceLineNo">145</span>                String s = constructStatement(stmt, varNames, bindings);<a name="line.145"></a>
<span class="sourceLineNo">146</span>                <a name="line.146"></a>
<span class="sourceLineNo">147</span>                // project only relevant variables, i.e. do not bind local variables<a name="line.147"></a>
<span class="sourceLineNo">148</span>                varNames = project(stmt, varNames);<a name="line.148"></a>
<span class="sourceLineNo">149</span>                <a name="line.149"></a>
<span class="sourceLineNo">150</span>                StringBuilder res = new StringBuilder();<a name="line.150"></a>
<span class="sourceLineNo">151</span>                <a name="line.151"></a>
<span class="sourceLineNo">152</span>                res.append("SELECT ");<a name="line.152"></a>
<span class="sourceLineNo">153</span>                <a name="line.153"></a>
<span class="sourceLineNo">154</span>                if (varNames.size()==0)<a name="line.154"></a>
<span class="sourceLineNo">155</span>                        throw new IllegalQueryException("SELECT query needs at least one projection!");<a name="line.155"></a>
<span class="sourceLineNo">156</span>                <a name="line.156"></a>
<span class="sourceLineNo">157</span>                for (String var : varNames)<a name="line.157"></a>
<span class="sourceLineNo">158</span>                        res.append(" ?").append(var);<a name="line.158"></a>
<span class="sourceLineNo">159</span>                <a name="line.159"></a>
<span class="sourceLineNo">160</span>                res.append(" WHERE { ").append(s);<a name="line.160"></a>
<span class="sourceLineNo">161</span>                <a name="line.161"></a>
<span class="sourceLineNo">162</span>                if (filterExpr!=null) {<a name="line.162"></a>
<span class="sourceLineNo">163</span>                        try {<a name="line.163"></a>
<span class="sourceLineNo">164</span>                                String filter = FilterUtils.toSparqlString(filterExpr);<a name="line.164"></a>
<span class="sourceLineNo">165</span>                                res.append("FILTER ").append(filter);<a name="line.165"></a>
<span class="sourceLineNo">166</span>                                evaluated = true;<a name="line.166"></a>
<span class="sourceLineNo">167</span>                        } catch (FilterConversionException e) {<a name="line.167"></a>
<span class="sourceLineNo">168</span>                                log.warn("Filter could not be evaluated remotely. " + e.getMessage());<a name="line.168"></a>
<span class="sourceLineNo">169</span>                        }<a name="line.169"></a>
<span class="sourceLineNo">170</span>                }<a name="line.170"></a>
<span class="sourceLineNo">171</span>        <a name="line.171"></a>
<span class="sourceLineNo">172</span>                res.append(" }");<a name="line.172"></a>
<span class="sourceLineNo">173</span>                <a name="line.173"></a>
<span class="sourceLineNo">174</span>                return res.toString();          <a name="line.174"></a>
<span class="sourceLineNo">175</span>        }<a name="line.175"></a>
<span class="sourceLineNo">176</span>        <a name="line.176"></a>
<span class="sourceLineNo">177</span>        /**<a name="line.177"></a>
<span class="sourceLineNo">178</span>         * Construct a SELECT query for the provided {@link ExclusiveGroup}. Note that bindings<a name="line.178"></a>
<span class="sourceLineNo">179</span>         * and filterExpr are applied whenever possible.<a name="line.179"></a>
<span class="sourceLineNo">180</span>         *  <a name="line.180"></a>
<span class="sourceLineNo">181</span>         * @param group<a name="line.181"></a>
<span class="sourceLineNo">182</span>         *                              the expression for the query<a name="line.182"></a>
<span class="sourceLineNo">183</span>         * @param bindings<a name="line.183"></a>
<span class="sourceLineNo">184</span>         *                              the bindings to be applied<a name="line.184"></a>
<span class="sourceLineNo">185</span>         * @param filterExpr<a name="line.185"></a>
<span class="sourceLineNo">186</span>         *                              a filter expression or null<a name="line.186"></a>
<span class="sourceLineNo">187</span>         * @param evaluated<a name="line.187"></a>
<span class="sourceLineNo">188</span>         *                              parameter can be used outside this method to check whether FILTER has been evaluated, false in beginning<a name="line.188"></a>
<span class="sourceLineNo">189</span>         * <a name="line.189"></a>
<span class="sourceLineNo">190</span>         * @return<a name="line.190"></a>
<span class="sourceLineNo">191</span>         * @throws IllegalQueryException <a name="line.191"></a>
<span class="sourceLineNo">192</span>         * <a name="line.192"></a>
<span class="sourceLineNo">193</span>         */<a name="line.193"></a>
<span class="sourceLineNo">194</span>        public static String selectQueryString( ExclusiveGroup group, BindingSet bindings, FilterValueExpr filterExpr, Boolean evaluated) throws IllegalQueryException  {<a name="line.194"></a>
<span class="sourceLineNo">195</span>                <a name="line.195"></a>
<span class="sourceLineNo">196</span>                StringBuilder sb = new StringBuilder();<a name="line.196"></a>
<span class="sourceLineNo">197</span>                Set&lt;String&gt; varNames = new HashSet&lt;String&gt;();<a name="line.197"></a>
<span class="sourceLineNo">198</span>                <a name="line.198"></a>
<span class="sourceLineNo">199</span>                for (ExclusiveStatement s : group.getStatements())<a name="line.199"></a>
<span class="sourceLineNo">200</span>                        sb.append( constructStatement(s, varNames, bindings) );<a name="line.200"></a>
<span class="sourceLineNo">201</span>                <a name="line.201"></a>
<span class="sourceLineNo">202</span>                // project only relevant variables, i.e. do not bind local variables<a name="line.202"></a>
<span class="sourceLineNo">203</span>                varNames = project(group, varNames);<a name="line.203"></a>
<span class="sourceLineNo">204</span>                <a name="line.204"></a>
<span class="sourceLineNo">205</span>                if (varNames.size()==0)<a name="line.205"></a>
<span class="sourceLineNo">206</span>                        throw new IllegalQueryException("SELECT query needs at least one projection!");         <a name="line.206"></a>
<span class="sourceLineNo">207</span><a name="line.207"></a>
<span class="sourceLineNo">208</span>                StringBuilder res = new StringBuilder();        <a name="line.208"></a>
<span class="sourceLineNo">209</span>                res.append("SELECT  ");<a name="line.209"></a>
<span class="sourceLineNo">210</span>                        <a name="line.210"></a>
<span class="sourceLineNo">211</span>                for (String var : varNames)<a name="line.211"></a>
<span class="sourceLineNo">212</span>                        res.append(" ?").append(var);<a name="line.212"></a>
<span class="sourceLineNo">213</span>                        <a name="line.213"></a>
<span class="sourceLineNo">214</span>                <a name="line.214"></a>
<span class="sourceLineNo">215</span>                res.append(" WHERE { ").append(sb);<a name="line.215"></a>
<span class="sourceLineNo">216</span>                <a name="line.216"></a>
<span class="sourceLineNo">217</span>                if (filterExpr!=null) {<a name="line.217"></a>
<span class="sourceLineNo">218</span>                        try {<a name="line.218"></a>
<span class="sourceLineNo">219</span>                                String filter = FilterUtils.toSparqlString(filterExpr);<a name="line.219"></a>
<span class="sourceLineNo">220</span>                                res.append("FILTER ").append(filter);<a name="line.220"></a>
<span class="sourceLineNo">221</span>                                evaluated = true;<a name="line.221"></a>
<span class="sourceLineNo">222</span>                        } catch (FilterConversionException e) {<a name="line.222"></a>
<span class="sourceLineNo">223</span>                                log.warn("Filter could not be evaluated remotely. " + e.getMessage());<a name="line.223"></a>
<span class="sourceLineNo">224</span>                        }<a name="line.224"></a>
<span class="sourceLineNo">225</span>                }<a name="line.225"></a>
<span class="sourceLineNo">226</span>                <a name="line.226"></a>
<span class="sourceLineNo">227</span>                res.append(" }");<a name="line.227"></a>
<span class="sourceLineNo">228</span>                <a name="line.228"></a>
<span class="sourceLineNo">229</span>                return res.toString();<a name="line.229"></a>
<span class="sourceLineNo">230</span>        }<a name="line.230"></a>
<span class="sourceLineNo">231</span><a name="line.231"></a>
<span class="sourceLineNo">232</span>        /**<a name="line.232"></a>
<span class="sourceLineNo">233</span>         * Transform the exclusive group into a ASK query string<a name="line.233"></a>
<span class="sourceLineNo">234</span>         * <a name="line.234"></a>
<span class="sourceLineNo">235</span>         * @param group<a name="line.235"></a>
<span class="sourceLineNo">236</span>         * @param bindings<a name="line.236"></a>
<span class="sourceLineNo">237</span>         * @return<a name="line.237"></a>
<span class="sourceLineNo">238</span>         * @throws IllegalQueryException<a name="line.238"></a>
<span class="sourceLineNo">239</span>         */<a name="line.239"></a>
<span class="sourceLineNo">240</span>        public static String askQueryString( ExclusiveGroup group, BindingSet bindings) {<a name="line.240"></a>
<span class="sourceLineNo">241</span>                <a name="line.241"></a>
<span class="sourceLineNo">242</span>                StringBuilder sb = new StringBuilder();<a name="line.242"></a>
<span class="sourceLineNo">243</span>                Set&lt;String&gt; varNames = new HashSet&lt;String&gt;();<a name="line.243"></a>
<span class="sourceLineNo">244</span>                <a name="line.244"></a>
<span class="sourceLineNo">245</span>                for (ExclusiveStatement s : group.getStatements())<a name="line.245"></a>
<span class="sourceLineNo">246</span>                        sb.append( constructStatement(s, varNames, bindings) );<a name="line.246"></a>
<span class="sourceLineNo">247</span>                <a name="line.247"></a>
<span class="sourceLineNo">248</span>                StringBuilder res = new StringBuilder();        <a name="line.248"></a>
<span class="sourceLineNo">249</span>                res.append("ASK { ").append(sb.toString()).append(" }");<a name="line.249"></a>
<span class="sourceLineNo">250</span>                return res.toString();<a name="line.250"></a>
<span class="sourceLineNo">251</span>        }<a name="line.251"></a>
<span class="sourceLineNo">252</span><a name="line.252"></a>
<span class="sourceLineNo">253</span>        /**<a name="line.253"></a>
<span class="sourceLineNo">254</span>         * Construct a SELECT query string for a bound union.<a name="line.254"></a>
<span class="sourceLineNo">255</span>         * <a name="line.255"></a>
<span class="sourceLineNo">256</span>         * Pattern:<a name="line.256"></a>
<span class="sourceLineNo">257</span>         * <a name="line.257"></a>
<span class="sourceLineNo">258</span>         * SELECT ?v_1 ?v_2 ?v_N WHERE { { ?v_1 p o } UNION { ?v_2 p o } UNION ... } <a name="line.258"></a>
<span class="sourceLineNo">259</span>         * <a name="line.259"></a>
<span class="sourceLineNo">260</span>         * Note that the filterExpr is not evaluated at the moment.<a name="line.260"></a>
<span class="sourceLineNo">261</span>         * <a name="line.261"></a>
<span class="sourceLineNo">262</span>         * @param stmt<a name="line.262"></a>
<span class="sourceLineNo">263</span>         * @param unionBindings<a name="line.263"></a>
<span class="sourceLineNo">264</span>         * @param filterExpr<a name="line.264"></a>
<span class="sourceLineNo">265</span>         * @param evaluated<a name="line.265"></a>
<span class="sourceLineNo">266</span>         *                      parameter can be used outside this method to check whether FILTER has been evaluated, false in beginning<a name="line.266"></a>
<span class="sourceLineNo">267</span>         * <a name="line.267"></a>
<span class="sourceLineNo">268</span>         * @return<a name="line.268"></a>
<span class="sourceLineNo">269</span>         */<a name="line.269"></a>
<span class="sourceLineNo">270</span>        public static String selectQueryStringBoundUnion( StatementPattern stmt, List&lt;BindingSet&gt; unionBindings, FilterValueExpr filterExpr, Boolean evaluated) {<a name="line.270"></a>
<span class="sourceLineNo">271</span>                                        <a name="line.271"></a>
<span class="sourceLineNo">272</span>                Set&lt;String&gt; varNames = new HashSet&lt;String&gt;();<a name="line.272"></a>
<span class="sourceLineNo">273</span>                <a name="line.273"></a>
<span class="sourceLineNo">274</span>                StringBuilder unions = new StringBuilder();<a name="line.274"></a>
<span class="sourceLineNo">275</span>                for (int i=0; i&lt;unionBindings.size(); i++) {<a name="line.275"></a>
<span class="sourceLineNo">276</span>                        String s = constructStatementId(stmt, Integer.toString(i), varNames, unionBindings.get(i));<a name="line.276"></a>
<span class="sourceLineNo">277</span>                        if (i&gt;0)<a name="line.277"></a>
<span class="sourceLineNo">278</span>                                unions.append(" UNION");<a name="line.278"></a>
<span class="sourceLineNo">279</span>                        unions.append(" { ").append(s).append(" }");<a name="line.279"></a>
<span class="sourceLineNo">280</span>                }<a name="line.280"></a>
<span class="sourceLineNo">281</span>                <a name="line.281"></a>
<span class="sourceLineNo">282</span>                StringBuilder res = new StringBuilder();<a name="line.282"></a>
<span class="sourceLineNo">283</span>                <a name="line.283"></a>
<span class="sourceLineNo">284</span>                res.append("SELECT ");<a name="line.284"></a>
<span class="sourceLineNo">285</span>                <a name="line.285"></a>
<span class="sourceLineNo">286</span>                for (String var : varNames)<a name="line.286"></a>
<span class="sourceLineNo">287</span>                        res.append(" ?").append(var);<a name="line.287"></a>
<span class="sourceLineNo">288</span>                                <a name="line.288"></a>
<span class="sourceLineNo">289</span>                res.append(" WHERE {");<a name="line.289"></a>
<span class="sourceLineNo">290</span>                <a name="line.290"></a>
<span class="sourceLineNo">291</span>                res.append( unions );<a name="line.291"></a>
<span class="sourceLineNo">292</span>                <a name="line.292"></a>
<span class="sourceLineNo">293</span>                // TODO evaluate filter expression remote<a name="line.293"></a>
<span class="sourceLineNo">294</span>//              if (filterExpr!=null) {<a name="line.294"></a>
<span class="sourceLineNo">295</span>//              <a name="line.295"></a>
<span class="sourceLineNo">296</span>//              }<a name="line.296"></a>
<span class="sourceLineNo">297</span>        <a name="line.297"></a>
<span class="sourceLineNo">298</span>                res.append(" }");<a name="line.298"></a>
<span class="sourceLineNo">299</span>                <a name="line.299"></a>
<span class="sourceLineNo">300</span>                return res.toString();<a name="line.300"></a>
<span class="sourceLineNo">301</span>        }       <a name="line.301"></a>
<span class="sourceLineNo">302</span>        <a name="line.302"></a>
<span class="sourceLineNo">303</span>        /**<a name="line.303"></a>
<span class="sourceLineNo">304</span>         * Creates a bound join subquery using the SPARQL 1.1 VALUES operator.<a name="line.304"></a>
<span class="sourceLineNo">305</span>         * <a name="line.305"></a>
<span class="sourceLineNo">306</span>         * Example subquery:<a name="line.306"></a>
<span class="sourceLineNo">307</span>         * <a name="line.307"></a>
<span class="sourceLineNo">308</span>         * &lt;source&gt;<a name="line.308"></a>
<span class="sourceLineNo">309</span>         * SELECT ?v ?__index WHERE {<a name="line.309"></a>
<span class="sourceLineNo">310</span>         *   ?s name ?v.<a name="line.310"></a>
<span class="sourceLineNo">311</span>         * } VALUES (?s ?__index) { (:s1 1) (:s2 2) ... (:sN N) }<a name="line.311"></a>
<span class="sourceLineNo">312</span>         * &lt;/source&gt;<a name="line.312"></a>
<span class="sourceLineNo">313</span>         * <a name="line.313"></a>
<span class="sourceLineNo">314</span>         * @param stmt<a name="line.314"></a>
<span class="sourceLineNo">315</span>         * @param unionBindings<a name="line.315"></a>
<span class="sourceLineNo">316</span>         * @param filterExpr<a name="line.316"></a>
<span class="sourceLineNo">317</span>         * @param evaluated<a name="line.317"></a>
<span class="sourceLineNo">318</span>         *                      parameter can be used outside this method to check whether FILTER has been evaluated, false in beginning<a name="line.318"></a>
<span class="sourceLineNo">319</span>         * <a name="line.319"></a>
<span class="sourceLineNo">320</span>         * @return<a name="line.320"></a>
<span class="sourceLineNo">321</span>         * @see SparqlFederationEvalStrategyWithValues<a name="line.321"></a>
<span class="sourceLineNo">322</span>         * @see BoundJoinVALUESConversionIteration<a name="line.322"></a>
<span class="sourceLineNo">323</span>         * @since 3.0<a name="line.323"></a>
<span class="sourceLineNo">324</span>         */<a name="line.324"></a>
<span class="sourceLineNo">325</span>        public static String selectQueryStringBoundJoinVALUES(StatementPattern stmt, List&lt;BindingSet&gt; unionBindings, FilterValueExpr filterExpr, Boolean evaluated) {<a name="line.325"></a>
<span class="sourceLineNo">326</span>                <a name="line.326"></a>
<span class="sourceLineNo">327</span>                Set&lt;String&gt; varNames = new LinkedHashSet&lt;String&gt;(); <a name="line.327"></a>
<span class="sourceLineNo">328</span>                StringBuilder res = new StringBuilder();<a name="line.328"></a>
<span class="sourceLineNo">329</span>                <a name="line.329"></a>
<span class="sourceLineNo">330</span>                String stmtPattern = constructStatement(stmt, varNames, new EmptyBindingSet());<a name="line.330"></a>
<span class="sourceLineNo">331</span>                res.append("SELECT ");<a name="line.331"></a>
<span class="sourceLineNo">332</span>                <a name="line.332"></a>
<span class="sourceLineNo">333</span>                for (String var : varNames)<a name="line.333"></a>
<span class="sourceLineNo">334</span>                        res.append(" ?").append(var);<a name="line.334"></a>
<span class="sourceLineNo">335</span>                                <a name="line.335"></a>
<span class="sourceLineNo">336</span>                res.append(" ?").append(BoundJoinVALUESConversionIteration.INDEX_BINDING_NAME).append(" WHERE {");<a name="line.336"></a>
<span class="sourceLineNo">337</span>                <a name="line.337"></a>
<span class="sourceLineNo">338</span>                res.append( stmtPattern );<a name="line.338"></a>
<span class="sourceLineNo">339</span>                <a name="line.339"></a>
<span class="sourceLineNo">340</span>                // TODO evaluate filter expression remote<a name="line.340"></a>
<span class="sourceLineNo">341</span>//              if (filterExpr!=null) {<a name="line.341"></a>
<span class="sourceLineNo">342</span>//              <a name="line.342"></a>
<span class="sourceLineNo">343</span>//              }<a name="line.343"></a>
<span class="sourceLineNo">344</span>        <a name="line.344"></a>
<span class="sourceLineNo">345</span>                res.append(" }");<a name="line.345"></a>
<span class="sourceLineNo">346</span>                <a name="line.346"></a>
<span class="sourceLineNo">347</span>                // add VALUES clause<a name="line.347"></a>
<span class="sourceLineNo">348</span>                res.append(" VALUES (");<a name="line.348"></a>
<span class="sourceLineNo">349</span>                <a name="line.349"></a>
<span class="sourceLineNo">350</span>                // find relevant bindings               <a name="line.350"></a>
<span class="sourceLineNo">351</span>                for (String var : varNames)<a name="line.351"></a>
<span class="sourceLineNo">352</span>                        res.append("?").append(var).append(" ");<a name="line.352"></a>
<span class="sourceLineNo">353</span>                res.append(" ?__index) { ");<a name="line.353"></a>
<span class="sourceLineNo">354</span>                <a name="line.354"></a>
<span class="sourceLineNo">355</span>                int index=0;<a name="line.355"></a>
<span class="sourceLineNo">356</span>                for (BindingSet b : unionBindings) {<a name="line.356"></a>
<span class="sourceLineNo">357</span>                        res.append("(");<a name="line.357"></a>
<span class="sourceLineNo">358</span>                        for (String var : varNames) {<a name="line.358"></a>
<span class="sourceLineNo">359</span>                                if (b.hasBinding(var))<a name="line.359"></a>
<span class="sourceLineNo">360</span>                                        appendValue(res, b.getValue(var)).append(" ");<a name="line.360"></a>
<span class="sourceLineNo">361</span>                                else<a name="line.361"></a>
<span class="sourceLineNo">362</span>                                        res.append("UNDEF ");<a name="line.362"></a>
<span class="sourceLineNo">363</span>                        }<a name="line.363"></a>
<span class="sourceLineNo">364</span>                        res.append("\"").append(index).append("\") ");<a name="line.364"></a>
<span class="sourceLineNo">365</span>                        index++;<a name="line.365"></a>
<span class="sourceLineNo">366</span>                }<a name="line.366"></a>
<span class="sourceLineNo">367</span>                res.append(" }");<a name="line.367"></a>
<span class="sourceLineNo">368</span>                <a name="line.368"></a>
<span class="sourceLineNo">369</span>                return res.toString();<a name="line.369"></a>
<span class="sourceLineNo">370</span>        }<a name="line.370"></a>
<span class="sourceLineNo">371</span>        <a name="line.371"></a>
<span class="sourceLineNo">372</span>        /**<a name="line.372"></a>
<span class="sourceLineNo">373</span>         * Modifies the set of varNames to remove those variables that are local<a name="line.373"></a>
<span class="sourceLineNo">374</span>         * to the expression, i.e. those that do not have to be projected. Does<a name="line.374"></a>
<span class="sourceLineNo">375</span>         * not create a copy!<a name="line.375"></a>
<span class="sourceLineNo">376</span>         * @param expr<a name="line.376"></a>
<span class="sourceLineNo">377</span>         * @param varNames<a name="line.377"></a>
<span class="sourceLineNo">378</span>         * @return<a name="line.378"></a>
<span class="sourceLineNo">379</span>         */<a name="line.379"></a>
<span class="sourceLineNo">380</span>        private static Set&lt;String&gt; project(StatementTupleExpr expr, Set&lt;String&gt; varNames) {<a name="line.380"></a>
<span class="sourceLineNo">381</span>                varNames.removeAll(expr.getLocalVars());<a name="line.381"></a>
<span class="sourceLineNo">382</span>                return varNames;<a name="line.382"></a>
<span class="sourceLineNo">383</span>        }<a name="line.383"></a>
<span class="sourceLineNo">384</span>        <a name="line.384"></a>
<span class="sourceLineNo">385</span>        /**<a name="line.385"></a>
<span class="sourceLineNo">386</span>         * Construct a SELECT query for a grouped bound check.<a name="line.386"></a>
<span class="sourceLineNo">387</span>         * <a name="line.387"></a>
<span class="sourceLineNo">388</span>         * Pattern:<a name="line.388"></a>
<span class="sourceLineNo">389</span>         * <a name="line.389"></a>
<span class="sourceLineNo">390</span>         * SELECT  ?o_1 .. ?o_N WHERE { { s1 p1 ?o_1 FILTER ?o_1=o1 } UNION ... UNION { sN pN ?o_N FILTER ?o_N=oN }}<a name="line.390"></a>
<span class="sourceLineNo">391</span>         * <a name="line.391"></a>
<span class="sourceLineNo">392</span>         * @param stmt<a name="line.392"></a>
<span class="sourceLineNo">393</span>         * @param unionBindings<a name="line.393"></a>
<span class="sourceLineNo">394</span>         * @return<a name="line.394"></a>
<span class="sourceLineNo">395</span>         */<a name="line.395"></a>
<span class="sourceLineNo">396</span>        public static String selectQueryStringBoundCheck(StatementPattern stmt, List&lt;BindingSet&gt; unionBindings) {<a name="line.396"></a>
<span class="sourceLineNo">397</span>                <a name="line.397"></a>
<span class="sourceLineNo">398</span>                Set&lt;String&gt; varNames = new HashSet&lt;String&gt;();<a name="line.398"></a>
<span class="sourceLineNo">399</span>                <a name="line.399"></a>
<span class="sourceLineNo">400</span>                StringBuilder unions = new StringBuilder();<a name="line.400"></a>
<span class="sourceLineNo">401</span>                for (int i=0; i&lt;unionBindings.size(); i++) {<a name="line.401"></a>
<span class="sourceLineNo">402</span>                        String s = constructStatementCheckId(stmt, i, varNames, unionBindings.get(i));<a name="line.402"></a>
<span class="sourceLineNo">403</span>                        if (i&gt;0)<a name="line.403"></a>
<span class="sourceLineNo">404</span>                                unions.append(" UNION");<a name="line.404"></a>
<span class="sourceLineNo">405</span>                        unions.append(" { ").append(s).append(" }");<a name="line.405"></a>
<span class="sourceLineNo">406</span>                }<a name="line.406"></a>
<span class="sourceLineNo">407</span>                <a name="line.407"></a>
<span class="sourceLineNo">408</span>                StringBuilder res = new StringBuilder();<a name="line.408"></a>
<span class="sourceLineNo">409</span><a name="line.409"></a>
<span class="sourceLineNo">410</span>                res.append("SELECT ");<a name="line.410"></a>
<span class="sourceLineNo">411</span>                <a name="line.411"></a>
<span class="sourceLineNo">412</span>                for (String var : varNames)<a name="line.412"></a>
<span class="sourceLineNo">413</span>                        res.append(" ?").append(var);<a name="line.413"></a>
<span class="sourceLineNo">414</span>                                <a name="line.414"></a>
<span class="sourceLineNo">415</span>                res.append(" WHERE {").append( unions ).append(" }");<a name="line.415"></a>
<span class="sourceLineNo">416</span>                <a name="line.416"></a>
<span class="sourceLineNo">417</span>                return res.toString();<a name="line.417"></a>
<span class="sourceLineNo">418</span>        }       <a name="line.418"></a>
<span class="sourceLineNo">419</span>        <a name="line.419"></a>
<span class="sourceLineNo">420</span>        <a name="line.420"></a>
<span class="sourceLineNo">421</span>        /**<a name="line.421"></a>
<span class="sourceLineNo">422</span>         * <a name="line.422"></a>
<span class="sourceLineNo">423</span>         * SELECT ?v_0 ?v_1 WHERE {<a name="line.423"></a>
<span class="sourceLineNo">424</span>         *              { ?v_0 p1 o1 . }<a name="line.424"></a>
<span class="sourceLineNo">425</span>         *              UNION<a name="line.425"></a>
<span class="sourceLineNo">426</span>         *              { ?v_1 p2 o1 . }<a name="line.426"></a>
<span class="sourceLineNo">427</span>         * }<a name="line.427"></a>
<span class="sourceLineNo">428</span>         * @param joinGroup<a name="line.428"></a>
<span class="sourceLineNo">429</span>         * @param bindings<a name="line.429"></a>
<span class="sourceLineNo">430</span>         * @return<a name="line.430"></a>
<span class="sourceLineNo">431</span>         */<a name="line.431"></a>
<span class="sourceLineNo">432</span>        public static String selectQueryStringIndependentJoinGroup(IndependentJoinGroup joinGroup, BindingSet bindings) {<a name="line.432"></a>
<span class="sourceLineNo">433</span>                <a name="line.433"></a>
<span class="sourceLineNo">434</span>                Set&lt;String&gt; varNames = new HashSet&lt;String&gt;();<a name="line.434"></a>
<span class="sourceLineNo">435</span>                <a name="line.435"></a>
<span class="sourceLineNo">436</span>                StringBuilder unions = new StringBuilder();<a name="line.436"></a>
<span class="sourceLineNo">437</span>                for (int i=0; i&lt;joinGroup.getMemberCount(); i++) {<a name="line.437"></a>
<span class="sourceLineNo">438</span>                        StatementPattern stmt = (StatementPattern)joinGroup.getMembers().get(i);<a name="line.438"></a>
<span class="sourceLineNo">439</span>                        String s = constructStatementId(stmt, Integer.toString(i), varNames, bindings);<a name="line.439"></a>
<span class="sourceLineNo">440</span>                        if (i&gt;0)<a name="line.440"></a>
<span class="sourceLineNo">441</span>                                unions.append(" UNION");<a name="line.441"></a>
<span class="sourceLineNo">442</span>                        unions.append(" { ").append(s).append(" }");<a name="line.442"></a>
<span class="sourceLineNo">443</span>                }<a name="line.443"></a>
<span class="sourceLineNo">444</span>                <a name="line.444"></a>
<span class="sourceLineNo">445</span>                StringBuilder res = new StringBuilder();<a name="line.445"></a>
<span class="sourceLineNo">446</span>                <a name="line.446"></a>
<span class="sourceLineNo">447</span>                res.append("SELECT ");<a name="line.447"></a>
<span class="sourceLineNo">448</span>                <a name="line.448"></a>
<span class="sourceLineNo">449</span>                for (String var : varNames)<a name="line.449"></a>
<span class="sourceLineNo">450</span>                        res.append(" ?").append(var);<a name="line.450"></a>
<span class="sourceLineNo">451</span>                                <a name="line.451"></a>
<span class="sourceLineNo">452</span>                res.append(" WHERE {");<a name="line.452"></a>
<span class="sourceLineNo">453</span>                <a name="line.453"></a>
<span class="sourceLineNo">454</span>                res.append( unions );<a name="line.454"></a>
<span class="sourceLineNo">455</span>                                <a name="line.455"></a>
<span class="sourceLineNo">456</span>                res.append(" }");<a name="line.456"></a>
<span class="sourceLineNo">457</span>                <a name="line.457"></a>
<span class="sourceLineNo">458</span>                return res.toString();<a name="line.458"></a>
<span class="sourceLineNo">459</span>        }<a name="line.459"></a>
<span class="sourceLineNo">460</span>        <a name="line.460"></a>
<span class="sourceLineNo">461</span>        /**<a name="line.461"></a>
<span class="sourceLineNo">462</span>         * Construct a select query representing a bound independent join group.<a name="line.462"></a>
<span class="sourceLineNo">463</span>         * <a name="line.463"></a>
<span class="sourceLineNo">464</span>         * ?v_%stmt%_%bindingId$<a name="line.464"></a>
<span class="sourceLineNo">465</span>         * <a name="line.465"></a>
<span class="sourceLineNo">466</span>         * SELECT ?v_0_0 ?v_0_1 ?v_1_0 ... <a name="line.466"></a>
<span class="sourceLineNo">467</span>         *      WHERE { <a name="line.467"></a>
<span class="sourceLineNo">468</span>         *              { ?v_0#0 p o UNION ?v_0_1 p o UNION ... } <a name="line.468"></a>
<span class="sourceLineNo">469</span>         *              UNION <a name="line.469"></a>
<span class="sourceLineNo">470</span>         *              { ?v_1_0 p o UNION ?v_1_1 p o UNION ... } <a name="line.470"></a>
<span class="sourceLineNo">471</span>         *      UNION<a name="line.471"></a>
<span class="sourceLineNo">472</span>         *      ...<a name="line.472"></a>
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<span class="sourceLineNo">474</span>         * @param joinGroup<a name="line.474"></a>
<span class="sourceLineNo">475</span>         * @param bindings<a name="line.475"></a>
<span class="sourceLineNo">476</span>         * @return<a name="line.476"></a>
<span class="sourceLineNo">477</span>         */<a name="line.477"></a>
<span class="sourceLineNo">478</span>        public static String selectQueryStringIndependentJoinGroup(IndependentJoinGroup joinGroup, List&lt;BindingSet&gt; bindings) {<a name="line.478"></a>
<span class="sourceLineNo">479</span>                <a name="line.479"></a>
<span class="sourceLineNo">480</span>                Set&lt;String&gt; varNames = new HashSet&lt;String&gt;();<a name="line.480"></a>
<span class="sourceLineNo">481</span>                <a name="line.481"></a>
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<span class="sourceLineNo">484</span>                        String innerUnion = constructInnerUnion((StatementPattern)joinGroup.getMembers().get(i), i, varNames, bindings);<a name="line.484"></a>
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<span class="sourceLineNo">486</span>                                outerUnion.append(" UNION");<a name="line.486"></a>
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<span class="sourceLineNo">489</span>                <a name="line.489"></a>
<span class="sourceLineNo">490</span>                <a name="line.490"></a>
<span class="sourceLineNo">491</span>                StringBuilder res = new StringBuilder();<a name="line.491"></a>
<span class="sourceLineNo">492</span>                <a name="line.492"></a>
<span class="sourceLineNo">493</span>                res.append("SELECT ");<a name="line.493"></a>
<span class="sourceLineNo">494</span>                <a name="line.494"></a>
<span class="sourceLineNo">495</span>                for (String var : varNames)<a name="line.495"></a>
<span class="sourceLineNo">496</span>                        res.append(" ?").append(var);<a name="line.496"></a>
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<span class="sourceLineNo">754</span>        <a name="line.754"></a>
<span class="sourceLineNo">755</span>        /**<a name="line.755"></a>
<span class="sourceLineNo">756</span>         * Append the uri to the stringbuilder, i.e. &lt;uri.stringValue&gt;.<a name="line.756"></a>
<span class="sourceLineNo">757</span>         * <a name="line.757"></a>
<span class="sourceLineNo">758</span>         * @param sb<a name="line.758"></a>
<span class="sourceLineNo">759</span>         * @param uri<a name="line.759"></a>
<span class="sourceLineNo">760</span>         * @return<a name="line.760"></a>
<span class="sourceLineNo">761</span>         */<a name="line.761"></a>
<span class="sourceLineNo">762</span>        protected static StringBuilder appendURI(StringBuilder sb, URI uri) {<a name="line.762"></a>
<span class="sourceLineNo">763</span>                sb.append("&lt;").append(uri.stringValue()).append("&gt;");<a name="line.763"></a>
<span class="sourceLineNo">764</span>                return sb;<a name="line.764"></a>
<span class="sourceLineNo">765</span>        }<a name="line.765"></a>
<span class="sourceLineNo">766</span>        <a name="line.766"></a>
<span class="sourceLineNo">767</span>        /**<a name="line.767"></a>
<span class="sourceLineNo">768</span>         * Append a dummy string (see {@link #BNODE_URI}) to represent the BNode.<a name="line.768"></a>
<span class="sourceLineNo">769</span>         * <a name="line.769"></a>
<span class="sourceLineNo">770</span>         * Note: currently it is not possible to retrieve values for a BNode via<a name="line.770"></a>
<span class="sourceLineNo">771</span>         * SPARQL, hence we use a dummy BNode which does not produce any results.<a name="line.771"></a>
<span class="sourceLineNo">772</span>         * A warning is printed to debug.<a name="line.772"></a>
<span class="sourceLineNo">773</span>         * <a name="line.773"></a>
<span class="sourceLineNo">774</span>         * @param sb<a name="line.774"></a>
<span class="sourceLineNo">775</span>         * @param uri<a name="line.775"></a>
<span class="sourceLineNo">776</span>         * @return<a name="line.776"></a>
<span class="sourceLineNo">777</span>         */<a name="line.777"></a>
<span class="sourceLineNo">778</span>        protected static StringBuilder appendBNode(StringBuilder sb, BNode bNode) {<a name="line.778"></a>
<span class="sourceLineNo">779</span>                log.debug("Cannot express BNodes in SPARQl: Bnode " + bNode.toString() + " is replaced with " + BNODE_URI.stringValue());<a name="line.779"></a>
<span class="sourceLineNo">780</span>                // TODO think how this can be done in queries, for now we just append a<a name="line.780"></a>
<span class="sourceLineNo">781</span>                // dummy URI which does not produce any results<a name="line.781"></a>
<span class="sourceLineNo">782</span>                return appendURI(sb, BNODE_URI);<a name="line.782"></a>
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<span class="sourceLineNo">784</span>        <a name="line.784"></a>
<span class="sourceLineNo">785</span>        <a name="line.785"></a>
<span class="sourceLineNo">786</span>        /**<a name="line.786"></a>
<span class="sourceLineNo">787</span>         * Append the literal to the stringbuilder.<a name="line.787"></a>
<span class="sourceLineNo">788</span>         * <a name="line.788"></a>
<span class="sourceLineNo">789</span>         * @param sb<a name="line.789"></a>
<span class="sourceLineNo">790</span>         * @param lit<a name="line.790"></a>
<span class="sourceLineNo">791</span>         * @return<a name="line.791"></a>
<span class="sourceLineNo">792</span>         */<a name="line.792"></a>
<span class="sourceLineNo">793</span>        protected static StringBuilder appendLiteral(StringBuilder sb, Literal lit) {<a name="line.793"></a>
<span class="sourceLineNo">794</span>                sb.append('"');<a name="line.794"></a>
<span class="sourceLineNo">795</span>                sb.append(lit.getLabel().replace("\"", "\\\""));<a name="line.795"></a>
<span class="sourceLineNo">796</span>                sb.append('"');<a name="line.796"></a>
<span class="sourceLineNo">797</span><a name="line.797"></a>
<span class="sourceLineNo">798</span>                if (lit.getLanguage() != null) {<a name="line.798"></a>
<span class="sourceLineNo">799</span>                        sb.append('@');<a name="line.799"></a>
<span class="sourceLineNo">800</span>                        sb.append(lit.getLanguage());<a name="line.800"></a>
<span class="sourceLineNo">801</span>                }<a name="line.801"></a>
<span class="sourceLineNo">802</span><a name="line.802"></a>
<span class="sourceLineNo">803</span>                if (lit.getDatatype() != null) {<a name="line.803"></a>
<span class="sourceLineNo">804</span>                        sb.append("^^&lt;");<a name="line.804"></a>
<span class="sourceLineNo">805</span>                        sb.append(lit.getDatatype().stringValue());<a name="line.805"></a>
<span class="sourceLineNo">806</span>                        sb.append('&gt;');<a name="line.806"></a>
<span class="sourceLineNo">807</span>                }<a name="line.807"></a>
<span class="sourceLineNo">808</span>                return sb;<a name="line.808"></a>
<span class="sourceLineNo">809</span>        }       <a name="line.809"></a>
<span class="sourceLineNo">810</span>        <a name="line.810"></a>
<span class="sourceLineNo">811</span>        <a name="line.811"></a>
<span class="sourceLineNo">812</span>        <a name="line.812"></a>
<span class="sourceLineNo">813</span>        /**<a name="line.813"></a>
<span class="sourceLineNo">814</span>         * load the queries from a queries file located at the specified path.<a name="line.814"></a>
<span class="sourceLineNo">815</span>         * <a name="line.815"></a>
<span class="sourceLineNo">816</span>         * Expected format:<a name="line.816"></a>
<span class="sourceLineNo">817</span>         *  - Queries are SPARQL queries in String format<a name="line.817"></a>
<span class="sourceLineNo">818</span>         *  - queries are allowed to span several lines<a name="line.818"></a>
<span class="sourceLineNo">819</span>         *  - a query is interpreted to be finished if an empty line occurs<a name="line.819"></a>
<span class="sourceLineNo">820</span>         *  <a name="line.820"></a>
<span class="sourceLineNo">821</span>         *  Ex:<a name="line.821"></a>
<span class="sourceLineNo">822</span>         *  <a name="line.822"></a>
<span class="sourceLineNo">823</span>         *  QUERY1 ...<a name="line.823"></a>
<span class="sourceLineNo">824</span>         *   Q1 cntd<a name="line.824"></a>
<span class="sourceLineNo">825</span>         *   <a name="line.825"></a>
<span class="sourceLineNo">826</span>         *  QUERY2<a name="line.826"></a>
<span class="sourceLineNo">827</span>         * <a name="line.827"></a>
<span class="sourceLineNo">828</span>         * @param queryType<a name="line.828"></a>
<span class="sourceLineNo">829</span>         * @return<a name="line.829"></a>
<span class="sourceLineNo">830</span>         *                      a list of queries for the query type<a name="line.830"></a>
<span class="sourceLineNo">831</span>         * @throws FileNotFoundException<a name="line.831"></a>
<span class="sourceLineNo">832</span>         * @throws IOException<a name="line.832"></a>
<span class="sourceLineNo">833</span>         */<a name="line.833"></a>
<span class="sourceLineNo">834</span>        public static List&lt;String&gt; loadQueries(String queryFile) throws FileNotFoundException, IOException {<a name="line.834"></a>
<span class="sourceLineNo">835</span>                ArrayList&lt;String&gt; res = new ArrayList&lt;String&gt;();<a name="line.835"></a>
<span class="sourceLineNo">836</span>                BufferedReader in = null;<a name="line.836"></a>
<span class="sourceLineNo">837</span>                try {<a name="line.837"></a>
<span class="sourceLineNo">838</span>                        in = new BufferedReader(new FileReader(queryFile));<a name="line.838"></a>
<span class="sourceLineNo">839</span>                        String tmp;<a name="line.839"></a>
<span class="sourceLineNo">840</span>                        String tmpQuery = "";<a name="line.840"></a>
<span class="sourceLineNo">841</span>                        while ((tmp = in.readLine()) != null){<a name="line.841"></a>
<span class="sourceLineNo">842</span>                                if (tmp.equals("")){<a name="line.842"></a>
<span class="sourceLineNo">843</span>                                        if (!tmpQuery.equals(""))<a name="line.843"></a>
<span class="sourceLineNo">844</span>                                                res.add(tmpQuery);<a name="line.844"></a>
<span class="sourceLineNo">845</span>                                        tmpQuery = "";<a name="line.845"></a>
<span class="sourceLineNo">846</span>                                }<a name="line.846"></a>
<span class="sourceLineNo">847</span>                                else {<a name="line.847"></a>
<span class="sourceLineNo">848</span>                                        tmpQuery = tmpQuery + tmp;<a name="line.848"></a>
<span class="sourceLineNo">849</span>                                }<a name="line.849"></a>
<span class="sourceLineNo">850</span>                        }<a name="line.850"></a>
<span class="sourceLineNo">851</span>                        if (!tmpQuery.equals(""))<a name="line.851"></a>
<span class="sourceLineNo">852</span>                                res.add(tmpQuery);<a name="line.852"></a>
<span class="sourceLineNo">853</span>                        return res;<a name="line.853"></a>
<span class="sourceLineNo">854</span>                } finally {<a name="line.854"></a>
<span class="sourceLineNo">855</span>                        if (in!=null)<a name="line.855"></a>
<span class="sourceLineNo">856</span>                                in.close();<a name="line.856"></a>
<span class="sourceLineNo">857</span>                }<a name="line.857"></a>
<span class="sourceLineNo">858</span>                <a name="line.858"></a>
<span class="sourceLineNo">859</span>        }<a name="line.859"></a>
<span class="sourceLineNo">860</span>}<a name="line.860"></a>




























































</pre>
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