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/**
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* Copyright 2006 OCLC Online Computer Library Center Licensed under the Apache
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* License, Version 2.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or
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* agreed to in writing, software distributed under the License is distributed on
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* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package edu.ucsb.nceas.metacat.oaipmh.provider.server.crosswalk;
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import java.io.FileInputStream;
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import java.io.StringReader;
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import java.io.StringWriter;
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import java.util.HashMap;
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import java.util.Properties;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.stream.StreamResult;
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import javax.xml.transform.stream.StreamSource;
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import ORG.oclc.oai.server.crosswalk.Crosswalk;
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import ORG.oclc.oai.server.verb.CannotDisseminateFormatException;
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import ORG.oclc.oai.server.verb.OAIInternalServerError;
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/**
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* Convert native "item" to oai_dc. In this case, the native "item" is assumed
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* to already be formatted as an OAI <record> element, with the possible
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* exception that multiple metadataFormats may be present in the <metadata>
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* element. The "crosswalk", merely involves pulling out the one that is
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* requested.
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*/
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public class Eml2oai_dc extends Crosswalk {
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/* Class fields */
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private static String dirPath = null;
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private static final String XSLT_NAME_200 = "eml200toDublinCore.xsl";
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private static final String XSLT_NAME_201 = "eml201toDublinCore.xsl";
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private static final String XSLT_NAME_210 = "eml210toDublinCore.xsl";
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private static final String SCHEMA_LOCATION =
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"http://www.openarchives.org/OAI/2.0/oai_dc/ " +
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"http://www.openarchives.org/OAI/2.0/oai_dc.xsd";
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/* Instance fields */
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private Transformer transformer = null;
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private Transformer transformer200 = null;
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private Transformer transformer201 = null;
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private Transformer transformer210 = null;
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/* Constructors */
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/**
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* The constructor assigns the schemaLocation associated with this crosswalk.
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* Since the crosswalk is trivial in this case, no properties are utilized.
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*
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* @param properties
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* properties that are needed to configure the crosswalk.
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*/
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public Eml2oai_dc(Properties properties) throws OAIInternalServerError {
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super(SCHEMA_LOCATION);
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String xsltPath200 = dirPath + "/" + XSLT_NAME_200;
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String xsltPath201 = dirPath + "/" + XSLT_NAME_201;
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String xsltPath210 = dirPath + "/" + XSLT_NAME_210;
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try {
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TransformerFactory tFactory200 = TransformerFactory.newInstance();
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FileInputStream fileInputStream200 = new FileInputStream(xsltPath200);
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StreamSource xslSource200 = new StreamSource(fileInputStream200);
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this.transformer200 = tFactory200.newTransformer(xslSource200);
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TransformerFactory tFactory201 = TransformerFactory.newInstance();
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FileInputStream fileInputStream201 = new FileInputStream(xsltPath201);
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StreamSource xslSource201 = new StreamSource(fileInputStream201);
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this.transformer201 = tFactory201.newTransformer(xslSource201);
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TransformerFactory tFactory210 = TransformerFactory.newInstance();
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FileInputStream fileInputStream210 = new FileInputStream(xsltPath210);
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StreamSource xslSource210 = new StreamSource(fileInputStream210);
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this.transformer210 = tFactory210.newTransformer(xslSource210);
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}
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catch (Exception e) {
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e.printStackTrace();
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throw new OAIInternalServerError(e.getMessage());
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}
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}
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/* Class methods */
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public static void setDirPath(String configDir) {
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Eml2oai_dc.dirPath = configDir;
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}
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/* Instance methods */
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/**
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* Perform the actual crosswalk.
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*
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* @param nativeItem
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* the native "item". In this case, it is already formatted as an OAI
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* <record> element, with the possible exception that multiple
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* metadataFormats are present in the <metadata> element.
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* @return a String containing the FileMap to be stored within the <metadata>
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* element.
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* @exception CannotDisseminateFormatException
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* nativeItem doesn't support this format.
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*/
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public String createMetadata(Object nativeItem)
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throws CannotDisseminateFormatException {
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HashMap recordMap = (HashMap) nativeItem;
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try {
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//String xmlRec = (new String((byte[]) recordMap.get("recordBytes"),
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// "UTF-8")).trim();
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String xmlRec = (String) recordMap.get("recordBytes");
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xmlRec = xmlRec.trim();
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if (xmlRec.startsWith("<?")) {
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int offset = xmlRec.indexOf("?>");
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xmlRec = xmlRec.substring(offset + 2);
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}
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if (xmlRec.contains("eml://ecoinformatics.org/eml-2.0.0")) {
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transformer = transformer200;
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}
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else if (xmlRec.contains("eml://ecoinformatics.org/eml-2.0.1")) {
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transformer = transformer201;
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}
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else if (xmlRec.contains("eml://ecoinformatics.org/eml-2.1.0")) {
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transformer = transformer210;
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}
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StringReader stringReader = new StringReader(xmlRec);
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StreamSource streamSource = new StreamSource(stringReader);
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StringWriter stringWriter = new StringWriter();
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synchronized (transformer) {
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transformer.transform(streamSource, new StreamResult(stringWriter));
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}
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return stringWriter.toString();
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}
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catch (Exception e) {
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throw new CannotDisseminateFormatException(e.getMessage());
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}
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}
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/**
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* Can this nativeItem be represented in DC format?
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*
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* @param nativeItem
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* a record in native format
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* @return true if DC format is possible, false otherwise.
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*/
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public boolean isAvailableFor(Object nativeItem) {
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return true;
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}
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}
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