diff options
author | dims <dims@13f79535-47bb-0310-9956-ffa450edef68> | 2008-06-17 00:23:01 +0000 |
---|---|---|
committer | dims <dims@13f79535-47bb-0310-9956-ffa450edef68> | 2008-06-17 00:23:01 +0000 |
commit | bdd0a41aed7edf21ec2a65cfa17a86af2ef8c48a (patch) | |
tree | 38a92061c0793434c4be189f1d70c3458b6bc41d /sandbox/old/contrib/persistence/common/src/main/java/org/apache/tuscany/service/persistence/common/PersistenceUnitScanner.java |
Move Tuscany from Incubator to top level.
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@668359 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'sandbox/old/contrib/persistence/common/src/main/java/org/apache/tuscany/service/persistence/common/PersistenceUnitScanner.java')
-rw-r--r-- | sandbox/old/contrib/persistence/common/src/main/java/org/apache/tuscany/service/persistence/common/PersistenceUnitScanner.java | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/sandbox/old/contrib/persistence/common/src/main/java/org/apache/tuscany/service/persistence/common/PersistenceUnitScanner.java b/sandbox/old/contrib/persistence/common/src/main/java/org/apache/tuscany/service/persistence/common/PersistenceUnitScanner.java new file mode 100644 index 0000000000..00fd02b891 --- /dev/null +++ b/sandbox/old/contrib/persistence/common/src/main/java/org/apache/tuscany/service/persistence/common/PersistenceUnitScanner.java @@ -0,0 +1,99 @@ +/* + * 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); + + } + +} |