/* | |
* Licensed to the Apache Software Foundation (ASF) under one or more | |
* contributor license agreements. See the NOTICE file distributed with | |
* this work for additional information regarding copyright ownership. | |
* The ASF licenses this file to You 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.apache.struts2.jasper.tagplugins.jstl.core; | |
import org.apache.struts2.jasper.compiler.tagplugin.TagPlugin; | |
import org.apache.struts2.jasper.compiler.tagplugin.TagPluginContext; | |
public class Catch implements TagPlugin { | |
public void doTag(TagPluginContext ctxt) { | |
//flag for the existence of the var attribute | |
boolean hasVar = ctxt.isAttributeSpecified("var"); | |
//temp name for exception and caught | |
String exceptionName = ctxt.getTemporaryVariableName(); | |
String caughtName = ctxt.getTemporaryVariableName(); | |
//main part to generate code | |
ctxt.generateJavaSource("boolean " + caughtName + " = false;"); | |
ctxt.generateJavaSource("try{"); | |
ctxt.generateBody(); | |
ctxt.generateJavaSource("}"); | |
//do catch | |
ctxt.generateJavaSource("catch(Throwable " + exceptionName + "){"); | |
//if the var specified, the exception object should | |
//be set to the attribute "var" defines in page scope | |
if(hasVar){ | |
String strVar = ctxt.getConstantAttribute("var"); | |
ctxt.generateJavaSource(" pageContext.setAttribute(\"" + strVar + "\", " | |
+ exceptionName + ", PageContext.PAGE_SCOPE);"); | |
} | |
//whenever there's exception caught, | |
//the flag caught should be set true; | |
ctxt.generateJavaSource(" " + caughtName + " = true;"); | |
ctxt.generateJavaSource("}"); | |
//do finally | |
ctxt.generateJavaSource("finally{"); | |
//if var specified, the attribute it defines | |
//in page scope should be removed | |
if(hasVar){ | |
String strVar = ctxt.getConstantAttribute("var"); | |
ctxt.generateJavaSource(" if(!" + caughtName + "){"); | |
ctxt.generateJavaSource(" pageContext.removeAttribute(\"" + strVar + "\", PageContext.PAGE_SCOPE);"); | |
ctxt.generateJavaSource(" }"); | |
} | |
ctxt.generateJavaSource("}"); | |
} | |
} |