106 lines
2.8 KiB
Java
Executable File
106 lines
2.8 KiB
Java
Executable File
package org.gcube.informationsystem.collector.impl.xmlstorage.exist;
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import java.io.BufferedReader;
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import java.io.FileReader;
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import java.io.IOException;
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import javax.xml.transform.OutputKeys;
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import org.exist.xmldb.XQueryService;
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import org.xmldb.api.base.Collection;
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import org.xmldb.api.base.CompiledExpression;
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import org.xmldb.api.base.ResourceSet;
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import org.gcube.common.core.utils.logging.GCUBELog;
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import org.gcube.informationsystem.collector.impl.xmlstorage.exist.XQuery;
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/**
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* XQuery to be executed
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*
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*/
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public class XQuery {
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private String query_string = null;
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private static GCUBELog logger = new GCUBELog(XQuery.class.getName());
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public XQuery(String xquery) {
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this.query_string = xquery;
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}
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public XQuery(FileReader file) throws IOException {
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try {
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this.query_string = this.readFile(file);
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} catch (IOException ioe) {
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logger.error("Unable to read the XQuery file");
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throw new IOException("Unable to read the XQuery file "
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+ ioe.getStackTrace()[0].toString());
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}
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}
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/**
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* Returns the xquery string
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*/
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public String toString() {
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return this.query_string;
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}
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/**
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* Executes the query on the given base collection
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*
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* @param col
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*/
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public ResourceSet execute(Collection col) throws Exception {
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logger.info("Executing query on collection " + col.getName());
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XQueryService service = (XQueryService) col.getService("XQueryService", "1.0");
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// set pretty-printing on
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service.setProperty(OutputKeys.INDENT, "yes");
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service.setProperty(OutputKeys.ENCODING, "UTF-8");
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CompiledExpression compiled = service.compile(this.query_string);
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long start = System.currentTimeMillis();
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// execute query and get results in ResourceSet
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ResourceSet result = service.execute(compiled);
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long qtime = System.currentTimeMillis() - start;
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start = System.currentTimeMillis();
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/*Properties outputProperties = new Properties();
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outputProperties.setProperty(OutputKeys.INDENT, "yes");
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SAXSerializer serializer = (SAXSerializer) SerializerPool.getInstance().borrowObject(SAXSerializer.class);
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serializer.setOutput(new OutputStreamWriter(System.out), outputProperties);
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SerializerPool.getInstance().returnObject(serializer); */
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//long rtime = System.currentTimeMillis() - start;
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logger.trace("hits: " + result.getSize());
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logger.trace("query time: " + qtime + "ms");
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//logger.info(State.logPrefix + "retrieve time: " + rtime);
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return result;
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}
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/**
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* Reads the xquery file and return as string.
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*/
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protected String readFile(FileReader file) throws IOException {
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BufferedReader f = new BufferedReader(file);
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String line;
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StringBuffer xml = new StringBuffer();
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while ((line = f.readLine()) != null)
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xml.append(line + " ");
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f.close();
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return xml.toString();
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}
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}
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