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)
{
}
}