/*
 * Copyright 2006-2009 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.springframework.batch.core.configuration.xml;

import java.util.Collection;

import org.springframework.batch.core.job.flow.support.state.StepState;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.parsing.BeanComponentDefinition;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.ParserContext;
import org.w3c.dom.Element;

/**
 * Internal parser for the <step/> elements inside a job. A step element
 * references a bean definition for a
 * {@link org.springframework.batch.core.Step} and goes on to (optionally) list
 * a set of transitions from that step to others with <next on="pattern"
 * to="stepName"/>. Used by the {@link JobParser}.
 * 
 * @see JobParser
 * 
 * @author Dave Syer
 * @author Thomas Risberg
 * @since 2.0
 */
public class InlineStepParser extends AbstractStepParser {

	/**
	 * Parse the step and turn it into a list of transitions.
	 * 
	 * @param element the <step/gt; element to parse
	 * @param parserContext the parser context for the bean factory
	 * @param jobFactoryRef the reference to the {@link JobParserJobFactoryBean}
	 *        from the enclosing tag
	 * @return a collection of bean definitions for
	 *         {@link org.springframework.batch.core.job.flow.support.StateTransition}
	 *         instances objects
	 */
	public Collection<BeanDefinition> parse(Element element, ParserContext parserContext, String jobFactoryRef) {

		BeanDefinitionBuilder stateBuilder = BeanDefinitionBuilder.genericBeanDefinition(StepState.class);
		String stepId = element.getAttribute(ID_ATTR);

		AbstractBeanDefinition bd = parseStep(element, parserContext, jobFactoryRef);
		parserContext.registerBeanComponent(new BeanComponentDefinition(bd, stepId));
		stateBuilder.addConstructorArgReference(stepId);

		return InlineFlowParser.getNextElements(parserContext, stepId, stateBuilder.getBeanDefinition(), element);

	}

}