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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;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.util.HashMap;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.HashSet;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.Scanner;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Set;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.concurrent.ConcurrentSkipListSet;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.regex.MatchResult;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.regex.Pattern;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.log4j.Logger;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.openrdf.query.BooleanQuery;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.openrdf.query.GraphQuery;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.openrdf.query.MalformedQueryException;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.openrdf.query.Query;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.openrdf.query.QueryLanguage;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.openrdf.query.TupleQuery;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.openrdf.query.algebra.TupleExpr;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.openrdf.query.impl.DatasetImpl;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import org.openrdf.query.impl.EmptyBindingSet;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import org.openrdf.query.parser.ParsedOperation;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import org.openrdf.query.parser.ParsedQuery;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import org.openrdf.query.parser.QueryParserUtil;<a name="line.40"></a>
<span class="sourceLineNo">041</span>import org.openrdf.repository.Repository;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import org.openrdf.repository.RepositoryConnection;<a name="line.42"></a>
<span class="sourceLineNo">043</span>import org.openrdf.repository.RepositoryException;<a name="line.43"></a>
<span class="sourceLineNo">044</span>import org.openrdf.sail.SailException;<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>import com.fluidops.fedx.exception.FedXException;<a name="line.46"></a>
<span class="sourceLineNo">047</span>import com.fluidops.fedx.exception.FedXRuntimeException;<a name="line.47"></a>
<span class="sourceLineNo">048</span>import com.fluidops.fedx.optimizer.Optimizer;<a name="line.48"></a>
<span class="sourceLineNo">049</span>import com.fluidops.fedx.structures.QueryInfo;<a name="line.49"></a>
<span class="sourceLineNo">050</span>import com.fluidops.fedx.structures.QueryType;<a name="line.50"></a>
<span class="sourceLineNo">051</span><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> * QueryManager to manage queries. <a name="line.54"></a>
<span class="sourceLineNo">055</span> * <a name="line.55"></a>
<span class="sourceLineNo">056</span> * a) Management of running queries (abort, finish)<a name="line.56"></a>
<span class="sourceLineNo">057</span> * b) Factory to create queries<a name="line.57"></a>
<span class="sourceLineNo">058</span> * <a name="line.58"></a>
<span class="sourceLineNo">059</span> * @author Andreas Schwarte<a name="line.59"></a>
<span class="sourceLineNo">060</span> */<a name="line.60"></a>
<span class="sourceLineNo">061</span>public class QueryManager {<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span>        <a name="line.63"></a>
<span class="sourceLineNo">064</span>        public static Logger log = Logger.getLogger(QueryManager.class);<a name="line.64"></a>
<span class="sourceLineNo">065</span>        <a name="line.65"></a>
<span class="sourceLineNo">066</span>        <a name="line.66"></a>
<span class="sourceLineNo">067</span>        // singleton behavior: initialized in constructor of FederationManager<a name="line.67"></a>
<span class="sourceLineNo">068</span>        protected static QueryManager instance = null;<a name="line.68"></a>
<span class="sourceLineNo">069</span>        protected static QueryManager getInstance() {<a name="line.69"></a>
<span class="sourceLineNo">070</span>                return instance;<a name="line.70"></a>
<span class="sourceLineNo">071</span>        }<a name="line.71"></a>
<span class="sourceLineNo">072</span>        <a name="line.72"></a>
<span class="sourceLineNo">073</span>        protected final FederationManager federationManager;<a name="line.73"></a>
<span class="sourceLineNo">074</span>        protected final Repository repo;<a name="line.74"></a>
<span class="sourceLineNo">075</span>        protected final RepositoryConnection conn;<a name="line.75"></a>
<span class="sourceLineNo">076</span>        protected Set&lt;QueryInfo&gt; runningQueries = new ConcurrentSkipListSet&lt;QueryInfo&gt;();<a name="line.76"></a>
<span class="sourceLineNo">077</span>        protected HashMap&lt;String, String&gt; prefixDeclarations = new HashMap&lt;String, String&gt;();<a name="line.77"></a>
<span class="sourceLineNo">078</span>        <a name="line.78"></a>
<span class="sourceLineNo">079</span>        protected QueryManager(FederationManager federationManager, Repository repo) {<a name="line.79"></a>
<span class="sourceLineNo">080</span>                this.federationManager = federationManager;<a name="line.80"></a>
<span class="sourceLineNo">081</span>                this.repo = repo;<a name="line.81"></a>
<span class="sourceLineNo">082</span>                try     {<a name="line.82"></a>
<span class="sourceLineNo">083</span>                        this.conn = repo.getConnection();<a name="line.83"></a>
<span class="sourceLineNo">084</span>                } catch (RepositoryException e) {<a name="line.84"></a>
<span class="sourceLineNo">085</span>                        throw new FedXRuntimeException(e);              // should never occur<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>        <a name="line.88"></a>
<span class="sourceLineNo">089</span>        <a name="line.89"></a>
<span class="sourceLineNo">090</span>        /**<a name="line.90"></a>
<span class="sourceLineNo">091</span>         * Add the query to the set of running queries, queries are identified via a unique id<a name="line.91"></a>
<span class="sourceLineNo">092</span>         * @param queryInfo<a name="line.92"></a>
<span class="sourceLineNo">093</span>         */<a name="line.93"></a>
<span class="sourceLineNo">094</span>        public void registerQuery(QueryInfo queryInfo) {<a name="line.94"></a>
<span class="sourceLineNo">095</span>                assert runningQueries.contains(queryInfo) : "Duplicate query: query " + queryInfo.getQueryID() + " is already registered.";<a name="line.95"></a>
<span class="sourceLineNo">096</span>                runningQueries.add(queryInfo);<a name="line.96"></a>
<span class="sourceLineNo">097</span>        }<a name="line.97"></a>
<span class="sourceLineNo">098</span>        <a name="line.98"></a>
<span class="sourceLineNo">099</span>        public Set&lt;QueryInfo&gt; getRunningQueries() {<a name="line.99"></a>
<span class="sourceLineNo">100</span>                return new HashSet&lt;QueryInfo&gt;(runningQueries);<a name="line.100"></a>
<span class="sourceLineNo">101</span>        }<a name="line.101"></a>
<span class="sourceLineNo">102</span>        <a name="line.102"></a>
<span class="sourceLineNo">103</span>        public int getNumberOfRunningQueries() {<a name="line.103"></a>
<span class="sourceLineNo">104</span>                return runningQueries.size();<a name="line.104"></a>
<span class="sourceLineNo">105</span>        }<a name="line.105"></a>
<span class="sourceLineNo">106</span>        <a name="line.106"></a>
<span class="sourceLineNo">107</span>        public void abortQuery(QueryInfo queryInfo) {<a name="line.107"></a>
<span class="sourceLineNo">108</span>                synchronized (queryInfo) {<a name="line.108"></a>
<span class="sourceLineNo">109</span>                        if (!runningQueries.contains(queryInfo))<a name="line.109"></a>
<span class="sourceLineNo">110</span>                                return;         <a name="line.110"></a>
<span class="sourceLineNo">111</span>                        log.info("Aborting query " + queryInfo.getQueryID());<a name="line.111"></a>
<span class="sourceLineNo">112</span>                        federationManager.getJoinScheduler().abort(queryInfo.getQueryID());<a name="line.112"></a>
<span class="sourceLineNo">113</span>                        federationManager.getUnionScheduler().abort(queryInfo.getQueryID());<a name="line.113"></a>
<span class="sourceLineNo">114</span>                        runningQueries.remove(queryInfo);<a name="line.114"></a>
<span class="sourceLineNo">115</span>                }<a name="line.115"></a>
<span class="sourceLineNo">116</span>        }<a name="line.116"></a>
<span class="sourceLineNo">117</span>        <a name="line.117"></a>
<span class="sourceLineNo">118</span>        public void finishQuery(QueryInfo queryInfo) {<a name="line.118"></a>
<span class="sourceLineNo">119</span>                runningQueries.remove(queryInfo);<a name="line.119"></a>
<span class="sourceLineNo">120</span>        }<a name="line.120"></a>
<span class="sourceLineNo">121</span>        <a name="line.121"></a>
<span class="sourceLineNo">122</span>        public boolean isRunning(QueryInfo queryInfo) {<a name="line.122"></a>
<span class="sourceLineNo">123</span>                return runningQueries.contains(queryInfo);<a name="line.123"></a>
<span class="sourceLineNo">124</span>        }<a name="line.124"></a>
<span class="sourceLineNo">125</span>        <a name="line.125"></a>
<span class="sourceLineNo">126</span>        /**<a name="line.126"></a>
<span class="sourceLineNo">127</span>         * Register a prefix declaration to be used during query evaluation. If a <a name="line.127"></a>
<span class="sourceLineNo">128</span>         * known prefix is used in a query, it is substituted in the parsing step.<a name="line.128"></a>
<span class="sourceLineNo">129</span>         * <a name="line.129"></a>
<span class="sourceLineNo">130</span>         * If prefix is null, the corresponding entry is removed.<a name="line.130"></a>
<span class="sourceLineNo">131</span>         * <a name="line.131"></a>
<span class="sourceLineNo">132</span>         * @param prefix<a name="line.132"></a>
<span class="sourceLineNo">133</span>         *                              a common prefix, e.g. rdf<a name="line.133"></a>
<span class="sourceLineNo">134</span>         * @param namespace<a name="line.134"></a>
<span class="sourceLineNo">135</span>         *                              the corresponding namespace, e.g. "http://www.w3.org/1999/02/22-rdf-syntax-ns#"<a name="line.135"></a>
<span class="sourceLineNo">136</span>         */<a name="line.136"></a>
<span class="sourceLineNo">137</span>        public void addPrefixDeclaration(String prefix, String namespace) {<a name="line.137"></a>
<span class="sourceLineNo">138</span>                if (prefix==null) {<a name="line.138"></a>
<span class="sourceLineNo">139</span>                        prefixDeclarations.remove(prefix);<a name="line.139"></a>
<span class="sourceLineNo">140</span>                        return;<a name="line.140"></a>
<span class="sourceLineNo">141</span>                }<a name="line.141"></a>
<span class="sourceLineNo">142</span>                <a name="line.142"></a>
<span class="sourceLineNo">143</span>                prefixDeclarations.put(prefix, namespace);<a name="line.143"></a>
<span class="sourceLineNo">144</span>        }<a name="line.144"></a>
<span class="sourceLineNo">145</span>        <a name="line.145"></a>
<span class="sourceLineNo">146</span>        <a name="line.146"></a>
<span class="sourceLineNo">147</span>        /**<a name="line.147"></a>
<span class="sourceLineNo">148</span>         * Prepare a tuple query which uses the underlying federation to evaluate the query.&lt;p&gt;<a name="line.148"></a>
<span class="sourceLineNo">149</span>         * <a name="line.149"></a>
<span class="sourceLineNo">150</span>         * The queryString is modified to use the declared PREFIX declarations, see <a name="line.150"></a>
<span class="sourceLineNo">151</span>         * {@link Config#getPrefixDeclarations()} for details.<a name="line.151"></a>
<span class="sourceLineNo">152</span>         * <a name="line.152"></a>
<span class="sourceLineNo">153</span>         * @param queryString<a name="line.153"></a>
<span class="sourceLineNo">154</span>         * @return<a name="line.154"></a>
<span class="sourceLineNo">155</span>         * @throws MalformedQueryException<a name="line.155"></a>
<span class="sourceLineNo">156</span>         */<a name="line.156"></a>
<span class="sourceLineNo">157</span>        public static TupleQuery prepareTupleQuery(String queryString) throws MalformedQueryException {<a name="line.157"></a>
<span class="sourceLineNo">158</span>                                <a name="line.158"></a>
<span class="sourceLineNo">159</span>                Query q = prepareQuery(queryString);<a name="line.159"></a>
<span class="sourceLineNo">160</span>                if (!(q instanceof TupleQuery))<a name="line.160"></a>
<span class="sourceLineNo">161</span>                        throw new FedXRuntimeException("Query is not a tuple query: " + q.getClass());<a name="line.161"></a>
<span class="sourceLineNo">162</span>                return (TupleQuery)q;<a name="line.162"></a>
<span class="sourceLineNo">163</span>        }<a name="line.163"></a>
<span class="sourceLineNo">164</span>        <a name="line.164"></a>
<span class="sourceLineNo">165</span>        /**<a name="line.165"></a>
<span class="sourceLineNo">166</span>         * Prepare a tuple query which uses the underlying federation to evaluate the query.&lt;p&gt;<a name="line.166"></a>
<span class="sourceLineNo">167</span>         * <a name="line.167"></a>
<span class="sourceLineNo">168</span>         * The queryString is modified to use the declared PREFIX declarations, see <a name="line.168"></a>
<span class="sourceLineNo">169</span>         * {@link Config#getPrefixDeclarations()} for details.<a name="line.169"></a>
<span class="sourceLineNo">170</span>         * <a name="line.170"></a>
<span class="sourceLineNo">171</span>         * @param queryString<a name="line.171"></a>
<span class="sourceLineNo">172</span>         * @return<a name="line.172"></a>
<span class="sourceLineNo">173</span>         * @throws MalformedQueryException<a name="line.173"></a>
<span class="sourceLineNo">174</span>         */<a name="line.174"></a>
<span class="sourceLineNo">175</span>        public static GraphQuery prepareGraphQuery(String queryString) throws MalformedQueryException {<a name="line.175"></a>
<span class="sourceLineNo">176</span>                                <a name="line.176"></a>
<span class="sourceLineNo">177</span>                Query q = prepareQuery(queryString);<a name="line.177"></a>
<span class="sourceLineNo">178</span>                if (!(q instanceof GraphQuery))<a name="line.178"></a>
<span class="sourceLineNo">179</span>                        throw new FedXRuntimeException("Query is not a graph query: " + q.getClass());<a name="line.179"></a>
<span class="sourceLineNo">180</span>                return (GraphQuery)q;<a name="line.180"></a>
<span class="sourceLineNo">181</span>        }<a name="line.181"></a>
<span class="sourceLineNo">182</span>        <a name="line.182"></a>
<span class="sourceLineNo">183</span>        /**<a name="line.183"></a>
<span class="sourceLineNo">184</span>         * Prepare a boolean query which uses the underlying federation to evaluate the query.&lt;p&gt;<a name="line.184"></a>
<span class="sourceLineNo">185</span>         * <a name="line.185"></a>
<span class="sourceLineNo">186</span>         * The queryString is modified to use the declared PREFIX declarations, see <a name="line.186"></a>
<span class="sourceLineNo">187</span>         * {@link Config#getPrefixDeclarations()} for details.<a name="line.187"></a>
<span class="sourceLineNo">188</span>         * <a name="line.188"></a>
<span class="sourceLineNo">189</span>         * @param queryString<a name="line.189"></a>
<span class="sourceLineNo">190</span>         * @return<a name="line.190"></a>
<span class="sourceLineNo">191</span>         * @throws MalformedQueryException<a name="line.191"></a>
<span class="sourceLineNo">192</span>         */<a name="line.192"></a>
<span class="sourceLineNo">193</span>        public static BooleanQuery prepareBooleanQuery(String queryString) throws MalformedQueryException {<a name="line.193"></a>
<span class="sourceLineNo">194</span>                                <a name="line.194"></a>
<span class="sourceLineNo">195</span>                Query q = prepareQuery(queryString);<a name="line.195"></a>
<span class="sourceLineNo">196</span>                if (!(q instanceof BooleanQuery))<a name="line.196"></a>
<span class="sourceLineNo">197</span>                        throw new FedXRuntimeException("Unexpected query type: " + q.getClass());<a name="line.197"></a>
<span class="sourceLineNo">198</span>                return (BooleanQuery)q;<a name="line.198"></a>
<span class="sourceLineNo">199</span>        }<a name="line.199"></a>
<span class="sourceLineNo">200</span>        <a name="line.200"></a>
<span class="sourceLineNo">201</span>        <a name="line.201"></a>
<span class="sourceLineNo">202</span>        static Pattern prefixCheck = Pattern.compile(".*PREFIX .*", Pattern.CASE_INSENSITIVE | Pattern.DOTALL);<a name="line.202"></a>
<span class="sourceLineNo">203</span>        static Pattern prefixPattern = Pattern.compile("PREFIX[ ]*(\\w*):[ ]*&lt;(\\S*)&gt;", Pattern.CASE_INSENSITIVE | Pattern.DOTALL);<a name="line.203"></a>
<span class="sourceLineNo">204</span>        <a name="line.204"></a>
<span class="sourceLineNo">205</span>        /**<a name="line.205"></a>
<span class="sourceLineNo">206</span>         * Prepare a {@link Query} which uses the underlying federation to evaluate the SPARQL query.&lt;p&gt;<a name="line.206"></a>
<span class="sourceLineNo">207</span>         * <a name="line.207"></a>
<span class="sourceLineNo">208</span>         * The queryString is modified to use the declared PREFIX declarations, see <a name="line.208"></a>
<span class="sourceLineNo">209</span>         * {@link Config#getPrefixDeclarations()} for details.<a name="line.209"></a>
<span class="sourceLineNo">210</span>         * <a name="line.210"></a>
<span class="sourceLineNo">211</span>         * @param queryString<a name="line.211"></a>
<span class="sourceLineNo">212</span>         * @return<a name="line.212"></a>
<span class="sourceLineNo">213</span>         * @throws MalformedQueryException<a name="line.213"></a>
<span class="sourceLineNo">214</span>         */<a name="line.214"></a>
<span class="sourceLineNo">215</span>        public static Query prepareQuery(String queryString) throws MalformedQueryException {<a name="line.215"></a>
<span class="sourceLineNo">216</span>                QueryManager qm = getInstance();<a name="line.216"></a>
<span class="sourceLineNo">217</span>                if (qm==null)<a name="line.217"></a>
<span class="sourceLineNo">218</span>                        throw new FedXRuntimeException("QueryManager not initialized, used FedXFactory methods to initialize FedX correctly.");<a name="line.218"></a>
<span class="sourceLineNo">219</span>                <a name="line.219"></a>
<span class="sourceLineNo">220</span>                <a name="line.220"></a>
<span class="sourceLineNo">221</span>                if (qm.prefixDeclarations.size()&gt;0) {<a name="line.221"></a>
<span class="sourceLineNo">222</span>                        <a name="line.222"></a>
<span class="sourceLineNo">223</span>                        /* we have to check for prefixes in the query to not add<a name="line.223"></a>
<span class="sourceLineNo">224</span>                         * duplicate entries. In case duplicates are present<a name="line.224"></a>
<span class="sourceLineNo">225</span>                         * Sesame throws a MalformedQueryException<a name="line.225"></a>
<span class="sourceLineNo">226</span>                         */<a name="line.226"></a>
<span class="sourceLineNo">227</span>                        if (prefixCheck.matcher(queryString).matches())<a name="line.227"></a>
<span class="sourceLineNo">228</span>                                queryString = qm.getPrefixDeclarationsCheck(queryString) + queryString;<a name="line.228"></a>
<span class="sourceLineNo">229</span>                        else<a name="line.229"></a>
<span class="sourceLineNo">230</span>                                queryString = qm.getPrefixDeclarations() + queryString;<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>                Query q;<a name="line.233"></a>
<span class="sourceLineNo">234</span>                try     {<a name="line.234"></a>
<span class="sourceLineNo">235</span>                        q = qm.conn.prepareQuery(QueryLanguage.SPARQL, queryString);<a name="line.235"></a>
<span class="sourceLineNo">236</span>                } catch (RepositoryException e) {<a name="line.236"></a>
<span class="sourceLineNo">237</span>                        throw new FedXRuntimeException(e);      // cannot occur<a name="line.237"></a>
<span class="sourceLineNo">238</span>                }<a name="line.238"></a>
<span class="sourceLineNo">239</span>                <a name="line.239"></a>
<span class="sourceLineNo">240</span>                // TODO set query time<a name="line.240"></a>
<span class="sourceLineNo">241</span>                <a name="line.241"></a>
<span class="sourceLineNo">242</span>                return q;<a name="line.242"></a>
<span class="sourceLineNo">243</span>        }<a name="line.243"></a>
<span class="sourceLineNo">244</span>        <a name="line.244"></a>
<span class="sourceLineNo">245</span>        /**<a name="line.245"></a>
<span class="sourceLineNo">246</span>         * Retrieve the query plan for the given query string.<a name="line.246"></a>
<span class="sourceLineNo">247</span>         */<a name="line.247"></a>
<span class="sourceLineNo">248</span>        public static String getQueryPlan(String queryString) throws MalformedQueryException, FedXException {<a name="line.248"></a>
<span class="sourceLineNo">249</span>                <a name="line.249"></a>
<span class="sourceLineNo">250</span>                QueryManager qm = getInstance();<a name="line.250"></a>
<span class="sourceLineNo">251</span>                if (qm==null)<a name="line.251"></a>
<span class="sourceLineNo">252</span>                        throw new FedXRuntimeException("QueryManager not initialized, used FedXFactory methods to initialize FedX correctly.");<a name="line.252"></a>
<span class="sourceLineNo">253</span>                                <a name="line.253"></a>
<span class="sourceLineNo">254</span>                if (qm.prefixDeclarations.size()&gt;0) {<a name="line.254"></a>
<span class="sourceLineNo">255</span>                        <a name="line.255"></a>
<span class="sourceLineNo">256</span>                        /* we have to check for prefixes in the query to not add<a name="line.256"></a>
<span class="sourceLineNo">257</span>                         * duplicate entries. In case duplicates are present<a name="line.257"></a>
<span class="sourceLineNo">258</span>                         * Sesame throws a MalformedQueryException<a name="line.258"></a>
<span class="sourceLineNo">259</span>                         */<a name="line.259"></a>
<span class="sourceLineNo">260</span>                        if (prefixCheck.matcher(queryString).matches())<a name="line.260"></a>
<span class="sourceLineNo">261</span>                                queryString = qm.getPrefixDeclarationsCheck(queryString) + queryString;<a name="line.261"></a>
<span class="sourceLineNo">262</span>                        else<a name="line.262"></a>
<span class="sourceLineNo">263</span>                                queryString = qm.getPrefixDeclarations() + queryString;<a name="line.263"></a>
<span class="sourceLineNo">264</span>                }<a name="line.264"></a>
<span class="sourceLineNo">265</span>                <a name="line.265"></a>
<span class="sourceLineNo">266</span>                ParsedOperation query = QueryParserUtil.parseOperation(QueryLanguage.SPARQL, queryString, null);<a name="line.266"></a>
<span class="sourceLineNo">267</span>                if (!(query instanceof ParsedQuery))<a name="line.267"></a>
<span class="sourceLineNo">268</span>                        throw new MalformedQueryException("Not a ParsedQuery: " + query.getClass());<a name="line.268"></a>
<span class="sourceLineNo">269</span>                // we use a dummy query info object here<a name="line.269"></a>
<span class="sourceLineNo">270</span>                QueryInfo qInfo = new QueryInfo(queryString, QueryType.SELECT);<a name="line.270"></a>
<span class="sourceLineNo">271</span>                TupleExpr tupleExpr = ((ParsedQuery)query).getTupleExpr();<a name="line.271"></a>
<span class="sourceLineNo">272</span>                try {<a name="line.272"></a>
<span class="sourceLineNo">273</span>                        tupleExpr = Optimizer.optimize(tupleExpr, new DatasetImpl(), EmptyBindingSet.getInstance(), FederationManager.getInstance().getStrategy(), qInfo);<a name="line.273"></a>
<span class="sourceLineNo">274</span>                        return tupleExpr.toString();<a name="line.274"></a>
<span class="sourceLineNo">275</span>                } catch (SailException e) {<a name="line.275"></a>
<span class="sourceLineNo">276</span>                        throw new FedXException("Unable to retrieve query plan: " + e.getMessage());<a name="line.276"></a>
<span class="sourceLineNo">277</span>                }               <a name="line.277"></a>
<span class="sourceLineNo">278</span>        }<a name="line.278"></a>
<span class="sourceLineNo">279</span>        <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>         * Get the prefix declarations that have to be prepended to the query.<a name="line.282"></a>
<span class="sourceLineNo">283</span>         * <a name="line.283"></a>
<span class="sourceLineNo">284</span>         * @return<a name="line.284"></a>
<span class="sourceLineNo">285</span>         */<a name="line.285"></a>
<span class="sourceLineNo">286</span>        protected String getPrefixDeclarations() {<a name="line.286"></a>
<span class="sourceLineNo">287</span>                StringBuilder sb = new StringBuilder();<a name="line.287"></a>
<span class="sourceLineNo">288</span>                for (String namespace : prefixDeclarations.keySet()) {<a name="line.288"></a>
<span class="sourceLineNo">289</span>                        sb.append("PREFIX ").append(namespace).append(": &lt;")<a name="line.289"></a>
<span class="sourceLineNo">290</span>                                        .append(prefixDeclarations.get(namespace)).append("&gt;\r\n");<a name="line.290"></a>
<span class="sourceLineNo">291</span>                }<a name="line.291"></a>
<span class="sourceLineNo">292</span>                return sb.toString();<a name="line.292"></a>
<span class="sourceLineNo">293</span>        }<a name="line.293"></a>
<span class="sourceLineNo">294</span>        <a name="line.294"></a>
<span class="sourceLineNo">295</span>        /**<a name="line.295"></a>
<span class="sourceLineNo">296</span>         * Get the prefix declarations that have to be added while considering<a name="line.296"></a>
<span class="sourceLineNo">297</span>         * prefixes that are already declared in the query. The issue here is<a name="line.297"></a>
<span class="sourceLineNo">298</span>         * that duplicate declaration causes exceptions in Sesame<a name="line.298"></a>
<span class="sourceLineNo">299</span>         * <a name="line.299"></a>
<span class="sourceLineNo">300</span>         * @param queryString<a name="line.300"></a>
<span class="sourceLineNo">301</span>         * @return<a name="line.301"></a>
<span class="sourceLineNo">302</span>         */<a name="line.302"></a>
<span class="sourceLineNo">303</span>        protected String getPrefixDeclarationsCheck(String queryString) {<a name="line.303"></a>
<span class="sourceLineNo">304</span>                <a name="line.304"></a>
<span class="sourceLineNo">305</span>                Set&lt;String&gt; queryPrefixes = findQueryPrefixes(queryString);<a name="line.305"></a>
<span class="sourceLineNo">306</span>                <a name="line.306"></a>
<span class="sourceLineNo">307</span>                StringBuilder sb = new StringBuilder();<a name="line.307"></a>
<span class="sourceLineNo">308</span>                for (String prefix : prefixDeclarations.keySet()) {<a name="line.308"></a>
<span class="sourceLineNo">309</span>                        if (queryPrefixes.contains(prefix))<a name="line.309"></a>
<span class="sourceLineNo">310</span>                                continue;       // already there, do not add<a name="line.310"></a>
<span class="sourceLineNo">311</span>                        sb.append("PREFIX ").append(prefix).append(": &lt;")<a name="line.311"></a>
<span class="sourceLineNo">312</span>                                        .append(prefixDeclarations.get(prefix)).append("&gt;\r\n");<a name="line.312"></a>
<span class="sourceLineNo">313</span>                }<a name="line.313"></a>
<span class="sourceLineNo">314</span>                return sb.toString();<a name="line.314"></a>
<span class="sourceLineNo">315</span>        }<a name="line.315"></a>
<span class="sourceLineNo">316</span>        <a name="line.316"></a>
<span class="sourceLineNo">317</span>        <a name="line.317"></a>
<span class="sourceLineNo">318</span>        /**<a name="line.318"></a>
<span class="sourceLineNo">319</span>         * Find all prefixes declared in the query<a name="line.319"></a>
<span class="sourceLineNo">320</span>         * @param queryString<a name="line.320"></a>
<span class="sourceLineNo">321</span>         * @return<a name="line.321"></a>
<span class="sourceLineNo">322</span>         */<a name="line.322"></a>
<span class="sourceLineNo">323</span>        protected static Set&lt;String&gt; findQueryPrefixes(String queryString) {<a name="line.323"></a>
<span class="sourceLineNo">324</span>                <a name="line.324"></a>
<span class="sourceLineNo">325</span>                HashSet&lt;String&gt; res = new HashSet&lt;String&gt;();<a name="line.325"></a>
<span class="sourceLineNo">326</span>                <a name="line.326"></a>
<span class="sourceLineNo">327</span>                Scanner sc = new Scanner(queryString);<a name="line.327"></a>
<span class="sourceLineNo">328</span>                while (true) {<a name="line.328"></a>
<span class="sourceLineNo">329</span>                        while (sc.findInLine(prefixPattern)!=null) {<a name="line.329"></a>
<span class="sourceLineNo">330</span>                                MatchResult m = sc.match();<a name="line.330"></a>
<span class="sourceLineNo">331</span>                                res.add(m.group(1));<a name="line.331"></a>
<span class="sourceLineNo">332</span>                        }<a name="line.332"></a>
<span class="sourceLineNo">333</span>                        if (!sc.hasNextLine())<a name="line.333"></a>
<span class="sourceLineNo">334</span>                                break;<a name="line.334"></a>
<span class="sourceLineNo">335</span>                        sc.nextLine();<a name="line.335"></a>
<span class="sourceLineNo">336</span>                }<a name="line.336"></a>
<span class="sourceLineNo">337</span>                sc.close();<a name="line.337"></a>
<span class="sourceLineNo">338</span>                return res;<a name="line.338"></a>
<span class="sourceLineNo">339</span>        }<a name="line.339"></a>
<span class="sourceLineNo">340</span>        <a name="line.340"></a>
<span class="sourceLineNo">341</span>        public static void main(String[] args) {<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>}<a name="line.345"></a>




























































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