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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.runtime.parser.Parser;
import org.apache.velocity.util.DuckType;
/**
* Handles number addition of nodes.<br><br>
*
* Please look at the Parser.jjt file which is
* what controls the generation of this class.
*
* @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a>
* @author <a href="mailto:pero@antaramusic.de">Peter Romianowski</a>
* @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @version $Id$
*/
public class ASTAddNode extends ASTMathNode
{
/**
* @param id
*/
public ASTAddNode(int id)
{
super(id);
}
/**
* @param p
* @param id
*/
public ASTAddNode(Parser p, int id)
{
super(p, id);
}
@Override
protected Object handleSpecial(Object left, Object right, InternalContextAdapter context)
{
// check for strings, but don't coerce
String lstr = DuckType.asString(left, false);
String rstr = DuckType.asString(right, false);
if (lstr != null || rstr != null)
{
if (lstr == null)
{
lstr = left != null ? left.toString() : jjtGetChild(0).literal();
}
else if (rstr == null)
{
rstr = right != null ? right.toString() : jjtGetChild(1).literal();
}
return lstr.concat(rstr);
}
return null;
}
@Override
public String getLiteralOperator()
{
return "+";
}
@Override
public Number perform(Number left, Number right, InternalContextAdapter context)
{
return MathUtils.add(left, right);
}
}
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