View Javadoc

1   /*
2    * Copyright 2006-2008 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.springframework.batch.core.configuration.xml;
17  
18  import java.util.Collection;
19  
20  import org.springframework.beans.MutablePropertyValues;
21  import org.springframework.beans.factory.config.BeanDefinition;
22  import org.springframework.beans.factory.support.AbstractBeanDefinition;
23  import org.springframework.beans.factory.support.BeanDefinitionBuilder;
24  import org.springframework.beans.factory.support.GenericBeanDefinition;
25  import org.springframework.beans.factory.xml.ParserContext;
26  import org.w3c.dom.Element;
27  
28  /**
29   * Internal parser for the <flow/> elements inside a job..
30   * 
31   * @see JobParser
32   * 
33   * @author Dave Syer
34   * 
35   */
36  public class FlowElementParser {
37  
38  	private static final String ID_ATTR = "id";
39  
40  	private static final String REF_ATTR = "parent";
41  
42  	/**
43  	 * Parse the flow and turn it into a list of transitions.
44  	 * 
45  	 * @param element the <flow/gt; element to parse
46  	 * @param parserContext the parser context for the bean factory
47  	 * @return a collection of bean definitions for
48  	 * {@link org.springframework.batch.core.job.flow.support.StateTransition}
49  	 * instances objects
50  	 */
51  	public Collection<BeanDefinition> parse(Element element, ParserContext parserContext) {
52  
53  		String refAttribute = element.getAttribute(REF_ATTR);
54  		String idAttribute = element.getAttribute(ID_ATTR);
55  
56  		BeanDefinitionBuilder stateBuilder = BeanDefinitionBuilder
57  				.genericBeanDefinition("org.springframework.batch.core.job.flow.support.state.FlowState");
58  
59  		AbstractBeanDefinition flowDefinition = new GenericBeanDefinition();
60  		flowDefinition.setParentName(refAttribute);
61  		MutablePropertyValues propertyValues = flowDefinition.getPropertyValues();
62  		propertyValues.addPropertyValue("name", idAttribute);
63  		stateBuilder.addConstructorArgValue(flowDefinition);
64  		stateBuilder.addConstructorArgValue(idAttribute);
65  		return InlineFlowParser.getNextElements(parserContext, stateBuilder.getBeanDefinition(), element);
66  
67  	}
68  }