org.snaker.engine.parser.ModelParser Maven / Gradle / Ivy
/* Copyright 2013-2014 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.snaker.engine.parser;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import org.snaker.engine.SnakerException;
import org.snaker.engine.core.ServiceContext;
import org.snaker.engine.helper.XmlHelper;
import org.snaker.engine.model.NodeModel;
import org.snaker.engine.model.ProcessModel;
import org.snaker.engine.model.TransitionModel;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
/**
* 流程定义xml文件的模型解析器
* @author yuqs
* @version 1.0
*/
public class ModelParser {
/**
* 解析流程定义文件，并将解析后的对象放入模型容器中
* @param bytes
*/
public static ProcessModel parse(byte[] bytes) {
DocumentBuilder documentBuilder = XmlHelper.createDocumentBuilder();
if(documentBuilder != null) {
Document doc = null;
try {
doc = documentBuilder.parse(new ByteArrayInputStream(bytes));
Element processE = doc.getDocumentElement();
ProcessModel process = new ProcessModel();
process.setName(processE.getAttribute(NodeParser.ATTR_NAME));
process.setDisplayName(processE.getAttribute(NodeParser.ATTR_DISPLAYNAME));
process.setExpireTime(processE.getAttribute(NodeParser.ATTR_EXPIRETIME));
process.setInstanceUrl(processE.getAttribute(NodeParser.ATTR_INSTANCEURL));
process.setInstanceNoClass(processE.getAttribute(NodeParser.ATTR_INSTANCENOCLASS));
NodeList nodeList = processE.getChildNodes();
int nodeSize = nodeList.getLength();
for(int i = 0; i < nodeSize; i++) {
Node node = nodeList.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
NodeModel model = parseModel(node);
process.getNodes().add(model);
}
}
//循环节点模型，构造变迁输入、输出的source、target
for(NodeModel node : process.getNodes()) {
for(TransitionModel transition : node.getOutputs()) {
String to = transition.getTo();
for(NodeModel node2 : process.getNodes()) {
if(to.equalsIgnoreCase(node2.getName())) {
node2.getInputs().add(transition);
transition.setTarget(node2);
}
}
}
}
return process;
} catch (SAXException e) {
e.printStackTrace();
throw new SnakerException(e);
} catch (IOException e) {
throw new SnakerException(e);
}
} else {
throw new SnakerException("documentBuilder is null");
}
}
/**
* 对流程定义xml的节点，根据其节点对应的解析器解析节点内容
* @param node
* @return
*/
private static NodeModel parseModel(Node node) {
String nodeName = node.getNodeName();
Element element = (Element)node;
NodeParser nodeParser = null;
try {
nodeParser = ServiceContext.getContext().findByName(nodeName, NodeParser.class);
nodeParser.parse(element);
return nodeParser.getModel();
} catch (RuntimeException e) {
throw new SnakerException(e);
}
}
}