Java tutorial
package org.xacml4j.spring; /* * #%L * Xacml4J Spring 3.x Support Module * %% * Copyright (C) 2009 - 2014 Xacml4J.org * %% * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Lesser Public License for more details. * * You should have received a copy of the GNU General Lesser Public * License along with this program. If not, see * <http://www.gnu.org/licenses/lgpl-3.0.html>. * #L% */ import java.util.List; import org.springframework.beans.factory.config.BeanDefinition; import org.springframework.beans.factory.support.AbstractBeanDefinition; import org.springframework.beans.factory.support.BeanDefinitionBuilder; import org.springframework.beans.factory.support.ManagedList; import org.springframework.beans.factory.xml.AbstractBeanDefinitionParser; import org.springframework.beans.factory.xml.ParserContext; import org.springframework.util.StringUtils; import org.springframework.util.xml.DomUtils; import org.w3c.dom.Element; public class FunctionProvidersDefinitionParser extends AbstractBeanDefinitionParser { @Override protected AbstractBeanDefinition parseInternal(Element element, ParserContext parserContext) { BeanDefinitionBuilder factory = BeanDefinitionBuilder .rootBeanDefinition(FunctionProvidersFactoryBean.class); List<Element> childElements = DomUtils.getChildElementsByTagName(element, "FunctionProvider"); if (childElements != null && childElements.size() > 0) { parseChildComponents(childElements, factory); } return factory.getBeanDefinition(); } private static BeanDefinitionBuilder parseComponent(Element element) { BeanDefinitionBuilder component = BeanDefinitionBuilder.rootBeanDefinition(FunctionProvider.class); String clazz = element.getAttribute("class"); if (StringUtils.hasText(clazz)) { component.addPropertyValue("providerClass", clazz); } String ref = element.getAttribute("ref"); if (StringUtils.hasText(ref)) { component.addPropertyReference("providerInstance", ref); } return component; } private static void parseChildComponents(List<Element> childElements, BeanDefinitionBuilder factory) { ManagedList<BeanDefinition> children = new ManagedList<BeanDefinition>(childElements.size()); for (Element childElement : childElements) { BeanDefinitionBuilder child = parseComponent(childElement); children.add(child.getBeanDefinition()); } factory.addPropertyValue("providers", children); } }