001/*
002 * Copyright 2006-2008 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.springframework.batch.core.configuration.xml;
017
018import java.util.Collection;
019
020import org.springframework.beans.MutablePropertyValues;
021import org.springframework.beans.factory.config.BeanDefinition;
022import org.springframework.beans.factory.support.AbstractBeanDefinition;
023import org.springframework.beans.factory.support.BeanDefinitionBuilder;
024import org.springframework.beans.factory.support.GenericBeanDefinition;
025import org.springframework.beans.factory.xml.ParserContext;
026import org.w3c.dom.Element;
027
028/**
029 * Internal parser for the <flow/> elements inside a job.
030 * 
031 * @see JobParser
032 * 
033 * @author Dave Syer
034 * 
035 */
036public class FlowElementParser {
037
038        private static final String ID_ATTR = "id";
039
040        private static final String REF_ATTR = "parent";
041
042        /**
043         * Parse the flow and turn it into a list of transitions.
044         * 
045         * @param element the <flow/gt; element to parse
046         * @param parserContext the parser context for the bean factory
047         * @return a collection of bean definitions for
048         * {@link org.springframework.batch.core.job.flow.support.StateTransition}
049         * instances objects
050         */
051        public Collection<BeanDefinition> parse(Element element, ParserContext parserContext) {
052
053                String refAttribute = element.getAttribute(REF_ATTR);
054                String idAttribute = element.getAttribute(ID_ATTR);
055
056                BeanDefinitionBuilder stateBuilder = BeanDefinitionBuilder
057                                .genericBeanDefinition("org.springframework.batch.core.job.flow.support.state.FlowState");
058
059                AbstractBeanDefinition flowDefinition = new GenericBeanDefinition();
060                flowDefinition.setParentName(refAttribute);
061                MutablePropertyValues propertyValues = flowDefinition.getPropertyValues();
062                propertyValues.addPropertyValue("name", idAttribute);
063                stateBuilder.addConstructorArgValue(flowDefinition);
064                stateBuilder.addConstructorArgValue(idAttribute);
065                return InlineFlowParser.getNextElements(parserContext, stateBuilder.getBeanDefinition(), element);
066
067        }
068}