package org.apache.velocity.runtime.parser.node; /* * 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. */ /** * Please look at the Parser.jjt file which is * what controls the generation of this class. * * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a> * @version $Id: ASTIfStatement.java 517553 2007-03-13 06:09:58Z wglass $ */ import java.io.IOException; import java.io.Writer; import org.apache.velocity.context.InternalContextAdapter; import org.apache.velocity.exception.MethodInvocationException; import org.apache.velocity.exception.ParseErrorException; import org.apache.velocity.exception.ResourceNotFoundException; import org.apache.velocity.runtime.parser.Parser; /** * */ public class ASTIfStatement extends SimpleNode { /** * @param id */ public ASTIfStatement(int id) { super(id); } /** * @param p * @param id */ public ASTIfStatement(Parser p, int id) { super(p, id); } /** * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object) */ public Object jjtAccept(ParserVisitor visitor, Object data) { return visitor.visit(this, data); } /** * @see org.apache.velocity.runtime.parser.node.SimpleNode#render(org.apache.velocity.context.InternalContextAdapter, java.io.Writer) */ public boolean render( InternalContextAdapter context, Writer writer) throws IOException,MethodInvocationException, ResourceNotFoundException, ParseErrorException { /* * Check if the #if(expression) construct evaluates to true: * if so render and leave immediately because there * is nothing left to do! */ if (jjtGetChild(0).evaluate(context)) { jjtGetChild(1).render(context, writer); return true; } int totalNodes = jjtGetNumChildren(); /* * Now check the remaining nodes left in the * if construct. The nodes are either elseif * nodes or else nodes. Each of these node * types knows how to evaluate themselves. If * a node evaluates to true then the node will * render itself and this method will return * as there is nothing left to do. */ for (int i = 2; i < totalNodes; i++) { if (jjtGetChild(i).evaluate(context)) { jjtGetChild(i).render(context, writer); return true; } } /* * This is reached when an ASTIfStatement * consists of an if/elseif sequence where * none of the nodes evaluate to true. */ return true; } /** * @param context * @param visitor */ public void process( InternalContextAdapter context, ParserVisitor visitor) { } }