org.apache.velocity.runtime.parser.node.ASTAndNode Maven / Gradle / Ivy
The newest version!
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.
*/
import org.apache.velocity.context.InternalContextAdapter;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.runtime.parser.Parser;
/**
* Please look at the Parser.jjt file which is
* what controls the generation of this class.
*
* @author Jason van Zyl
* @author Geir Magnusson Jr.
* @version $Id$
*/
public class ASTAndNode extends ASTLogicalOperator
{
/**
* @param id
*/
public ASTAndNode(int id)
{
super(id);
}
/**
* @param p
* @param id
*/
public ASTAndNode(Parser p, int id)
{
super(p, id);
}
@Override
public String getLiteralOperator()
{
return "&&";
}
/**
* @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object)
*/
@Override
public Object jjtAccept(ParserVisitor visitor, Object data)
{
return visitor.visit(this, data);
}
/**
* Returns the value of the expression.
* Since the value of the expression is simply the boolean
* result of evaluate(), lets return that.
* @param context
* @return The value of the expression.
* @throws MethodInvocationException
*/
@Override
public Object value(InternalContextAdapter context)
throws MethodInvocationException
{
return evaluate(context) ? Boolean.TRUE : Boolean.FALSE;
}
/**
* logical and :
*
* null && right = false
* left && null = false
* null && null = false
*
* @param context
* @return True if both sides are true.
* @throws MethodInvocationException
*/
@Override
public boolean evaluate(InternalContextAdapter context)
throws MethodInvocationException
{
Node left = jjtGetChild(0);
Node right = jjtGetChild(1);
/*
* null == false
*/
if (left == null || right == null)
{
return false;
}
/*
* short circuit the test. Don't eval the RHS if the LHS is false
*/
if( left.evaluate( context ) )
{
if ( right.evaluate( context ) )
{
return true;
}
}
return false;
}
}