Java tutorial
/* * Copyright 2009 The Fornax Project Team, including the original * author or authors. * * Licensed 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.fornax.cartridges.sculptor.framework.test; import java.util.HashSet; import java.util.Iterator; import java.util.Set; import org.dom4j.Attribute; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; class PersistenceXmlParser { private final Set<String> persictenceUnitNames = new HashSet<String>(); @SuppressWarnings("unchecked") void parse(String xml) { try { Document document = DocumentHelper.parseText(xml); Element rootElement = document.getRootElement(); Iterator<Element> elementIterator = rootElement.elementIterator("persistence-unit"); while (elementIterator.hasNext()) { parsePersistentUnit(elementIterator.next()); } } catch (DocumentException e) { throw new RuntimeException(e.getMessage()); } } private void parsePersistentUnit(Element persistenceUnitElement) { Attribute persistenceUnitNameAttribute = persistenceUnitElement.attribute("name"); if (persistenceUnitNameAttribute == null) { throw new IllegalArgumentException("Invalid persistence.xml, no persistence-unit name"); } persictenceUnitNames.add(persistenceUnitNameAttribute.getText()); } Set<String> getPersictenceUnitNames() { return persictenceUnitNames; } }