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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.service.persistence.common;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import javax.persistence.spi.PersistenceUnitInfo;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
/**
* Scans the classloader for the specified persistence unit.
*
* @version $Rev$ $Date$
*/
class PersistenceUnitScanner {
/** Cache of persistence unit info */
private Map<String, PersistenceUnitInfo> persistenceUnitInfos = new HashMap<String, PersistenceUnitInfo>();
/**
* Scans the lassloader for the specified persistence unit and creates
* an immutable representation of the information present in the matching
* persistence.xml file.
*
* @param unitName Persistence unit name.
* @param classLoader Classloader to scan.
* @return Persistence unit information.
*/
PersistenceUnitInfo getPersistenceUnitInfo(String unitName, ClassLoader classLoader) {
synchronized (persistenceUnitInfos) {
if(persistenceUnitInfos.containsKey(unitName)) {
return persistenceUnitInfos.get(unitName);
}
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Enumeration<URL> persistenceUnitUrls = classLoader.getResources("META-INF/persistence.xml");
while (persistenceUnitUrls.hasMoreElements()) {
URL persistenceUnitUrl = persistenceUnitUrls.nextElement();
Document persistenceDom = db.parse(persistenceUnitUrl.openStream());
String rootJarUrl = persistenceUnitUrl.toString();
rootJarUrl = rootJarUrl.substring(0, rootJarUrl.lastIndexOf("META-INF"));
PersistenceUnitInfo info = new TuscanyPersistenceUnitInfo(persistenceDom, classLoader, rootJarUrl);
if (!unitName.equals(info.getPersistenceUnitName())) {
continue;
}
persistenceUnitInfos.put(unitName, info);
return info;
}
} catch (IOException ex) {
throw new TuscanyJpaException(ex);
} catch (ParserConfigurationException ex) {
throw new TuscanyJpaException(ex);
} catch (SAXException ex) {
throw new TuscanyJpaException(ex);
}
}
throw new TuscanyJpaException("Unabel to find persistence unit: " + unitName);
}
}
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