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<pre><span class="sourceLineNo">001</span>package com.fluidops.fedx.provider;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import info.aduna.iteration.Iterations;<a name="line.3"></a>
<span class="sourceLineNo">004</span><a name="line.4"></a>
<span class="sourceLineNo">005</span>import org.openrdf.query.MalformedQueryException;<a name="line.5"></a>
<span class="sourceLineNo">006</span>import org.openrdf.query.QueryEvaluationException;<a name="line.6"></a>
<span class="sourceLineNo">007</span>import org.openrdf.query.QueryLanguage;<a name="line.7"></a>
<span class="sourceLineNo">008</span>import org.openrdf.query.TupleQuery;<a name="line.8"></a>
<span class="sourceLineNo">009</span>import org.openrdf.query.TupleQueryResult;<a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.openrdf.repository.Repository;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import org.openrdf.repository.RepositoryConnection;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import org.openrdf.repository.RepositoryException;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>import com.fluidops.fedx.Config;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import com.fluidops.fedx.structures.Endpoint;<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> * Convenience methods for {@link Endpoint} providers<a name="line.18"></a>
<span class="sourceLineNo">019</span> * <a name="line.19"></a>
<span class="sourceLineNo">020</span> * @author Andreas Schwarte<a name="line.20"></a>
<span class="sourceLineNo">021</span> *<a name="line.21"></a>
<span class="sourceLineNo">022</span> */<a name="line.22"></a>
<span class="sourceLineNo">023</span>public class ProviderUtil {<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>        /**<a name="line.25"></a>
<span class="sourceLineNo">026</span>         * Checks the connection by submitting a SPARQL SELECT query:<a name="line.26"></a>
<span class="sourceLineNo">027</span>         * <a name="line.27"></a>
<span class="sourceLineNo">028</span>         * SELECT * WHERE { ?s ?p ?o } LIMIT 1<a name="line.28"></a>
<span class="sourceLineNo">029</span>         * <a name="line.29"></a>
<span class="sourceLineNo">030</span>         * Throws an exception if the query cannot be evaluated<a name="line.30"></a>
<span class="sourceLineNo">031</span>         * successfully for some reason (indicating that the <a name="line.31"></a>
<span class="sourceLineNo">032</span>         * endpoint is not ok)<a name="line.32"></a>
<span class="sourceLineNo">033</span>         * <a name="line.33"></a>
<span class="sourceLineNo">034</span>         * @param repo<a name="line.34"></a>
<span class="sourceLineNo">035</span>         * @throws RepositoryException<a name="line.35"></a>
<span class="sourceLineNo">036</span>         * @throws QueryEvaluationException<a name="line.36"></a>
<span class="sourceLineNo">037</span>         * @throws MalformedQueryException<a name="line.37"></a>
<span class="sourceLineNo">038</span>         */<a name="line.38"></a>
<span class="sourceLineNo">039</span>        public static void checkConnectionIfConfigured(Repository repo) throws RepositoryException {<a name="line.39"></a>
<span class="sourceLineNo">040</span>                <a name="line.40"></a>
<span class="sourceLineNo">041</span>                if (!Config.getConfig().isValidateRepositoryConnections())<a name="line.41"></a>
<span class="sourceLineNo">042</span>                        return;<a name="line.42"></a>
<span class="sourceLineNo">043</span>                <a name="line.43"></a>
<span class="sourceLineNo">044</span>                RepositoryConnection conn = null;               <a name="line.44"></a>
<span class="sourceLineNo">045</span>                try {<a name="line.45"></a>
<span class="sourceLineNo">046</span>                        conn = repo.getConnection();<a name="line.46"></a>
<span class="sourceLineNo">047</span>                        TupleQuery query = conn.prepareTupleQuery(QueryLanguage.SPARQL, "SELECT * WHERE { ?s ?p ?o } LIMIT 1");<a name="line.47"></a>
<span class="sourceLineNo">048</span>                        TupleQueryResult qRes = null;<a name="line.48"></a>
<span class="sourceLineNo">049</span>                        try {<a name="line.49"></a>
<span class="sourceLineNo">050</span>                                qRes = query.evaluate();<a name="line.50"></a>
<span class="sourceLineNo">051</span>                                if (!qRes.hasNext())<a name="line.51"></a>
<span class="sourceLineNo">052</span>                                        throw new RepositoryException("No data in provided repository");<a name="line.52"></a>
<span class="sourceLineNo">053</span>                        } finally {<a name="line.53"></a>
<span class="sourceLineNo">054</span>                                if (qRes!=null)<a name="line.54"></a>
<span class="sourceLineNo">055</span>                                        Iterations.closeCloseable(qRes);<a name="line.55"></a>
<span class="sourceLineNo">056</span>                        }                       <a name="line.56"></a>
<span class="sourceLineNo">057</span>                        <a name="line.57"></a>
<span class="sourceLineNo">058</span>                } catch (MalformedQueryException ignore) { <a name="line.58"></a>
<span class="sourceLineNo">059</span>                                ;       // can never occur<a name="line.59"></a>
<span class="sourceLineNo">060</span>                } catch (QueryEvaluationException e) {<a name="line.60"></a>
<span class="sourceLineNo">061</span>                        throw new RepositoryException(e);<a name="line.61"></a>
<span class="sourceLineNo">062</span>                } finally {                     <a name="line.62"></a>
<span class="sourceLineNo">063</span>                        if (conn!=null)<a name="line.63"></a>
<span class="sourceLineNo">064</span>                                conn.close();<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>}<a name="line.67"></a>




























































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