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/**
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* Copyright (C) 2009 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.ext.sru;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import org.apache.http.NameValuePair;
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import org.apache.http.message.BasicNameValuePair;
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import eu.etaxonomy.cdm.ext.common.SchemaAdapterBase;
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import eu.etaxonomy.cdm.ext.common.ServiceWrapperBase;
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import eu.etaxonomy.cdm.model.reference.Reference;
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/**
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* @author a.kohlbecker
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* @since 24.08.2010
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*/
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public class SruServiceWrapper extends ServiceWrapperBase<Reference> {
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private String sruVersion = "1.1";
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/**
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* The GRIB sru service is available at "http://gso.gbv.de/sru/DB=1.83/"
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* The documentation is found at http://bhleurope.gbv.de/#sru from where the following text has been retrieved:
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* <p>
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* General information about Search/Retrieve via URL (SRU) is available in
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* the official SRU specification (http://www.loc.gov/standards/sru/). The SRU-Interface of GRIB supports some
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* specific search keys. Please do not use the (dc) fields but only the
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* (pica) search fields:
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* <dl>
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* <dt>PPN</dt>
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* <dd>Internal record id without prefix 'grib:ppn:' (This may change)</dd>
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* <dt>DST</dt>
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* <dd>Digitization status (8300-8305: 8300=not digitized, 8301=should be digitized, 8302=will be digitized, 8305=document available)</dd>
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* <dt>URL</dt>
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* <dd>URL of a digitized object</dd>
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* <dt>??? (not defined yet)</td>
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* <dd>Stable identifier of a record (PICA+ field 006Y)</dd>
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* </dl>
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* </p>
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* @param cqlQuery
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* an <b>URL encoded</b> CQL Query string see
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* {@link http://www.loc.gov/standards/sru/specs/cql.html} for documentation
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* @param recordSchema
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* @return
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*/
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public List<Reference> doSearchRetrieve(String cqlQuery, String recordSchema){
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List<NameValuePair> pairs = new ArrayList<NameValuePair>();
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SchemaAdapterBase<Reference> schemaAdapter = schemaAdapterMap.get(recordSchema);
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if(schemaAdapter == null){
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logger.error("No SchemaAdapter found for " + recordSchema);
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}
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String sruOperation = "searchRetrieve";
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pairs.add(new BasicNameValuePair("operation", sruOperation));
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pairs.add(new BasicNameValuePair("version", sruVersion));
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pairs.add(new BasicNameValuePair("query", cqlQuery));
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pairs.add(new BasicNameValuePair("recordSchema", recordSchema));
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Map<String, String> requestHeaders = new HashMap<>();
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requestHeaders.put("Accept-Charset", "UTF-8");
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try {
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URI requestUri = createUri(null, pairs);
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InputStream stream = executeHttpGet(requestUri, requestHeaders);
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return schemaAdapter.getCmdEntities(stream);
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} catch (IOException e) {
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// thrown by doHttpGet
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logger.error(e);
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} catch (URISyntaxException e) {
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// thrown by createUri
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logger.error(e);
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}
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return null;
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}
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}
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