package bboss.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 bboss.org.apache.velocity.context.InternalContextAdapter;
import bboss.org.apache.velocity.exception.MethodInvocationException;
import bboss.org.apache.velocity.exception.VelocityException;
import bboss.org.apache.velocity.runtime.RuntimeConstants;
import bboss.org.apache.velocity.runtime.log.Log;
import bboss.org.apache.velocity.runtime.parser.Parser;
import bboss.org.apache.velocity.util.TemplateNumber;
/**
* Handles arg1 < arg2<br><br>
*
* Only subclasses of Number can be compared.<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>
*/
public class ASTLTNode extends SimpleNode
{
/**
* @param id
*/
public ASTLTNode(int id)
{
super(id);
}
/**
* @param p
* @param id
*/
public ASTLTNode(Parser p, int id)
{
super(p, id);
}
/**
* @see bboss.org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(bboss.org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object)
*/
public Object jjtAccept(ParserVisitor visitor, Object data)
{
return visitor.visit(this, data);
}
/**
* @see bboss.org.apache.velocity.runtime.parser.node.SimpleNode#evaluate(bboss.org.apache.velocity.context.InternalContextAdapter)
*/
public boolean evaluate(InternalContextAdapter context)
throws MethodInvocationException
{
/*
* get the two args
*/
Object left = jjtGetChild(0).value( context );
Object right = jjtGetChild(1).value( context );
/*
* if either is null, lets log and bail
*/
if (left == null || right == null)
{
String msg = (left == null ? "Left" : "Right")
+ " side ("
+ jjtGetChild( (left == null? 0 : 1) ).literal()
+ ") of '<' operation has null value at "
+ Log.formatFileString(this);
if (rsvc.getBoolean(RuntimeConstants.RUNTIME_REFERENCES_STRICT, false))
{
throw new VelocityException(msg);
}
log.error(msg);
return false;
}
/*
* convert to Number if applicable
*/
if (left instanceof TemplateNumber)
{
left = ( (TemplateNumber) left).getAsNumber();
}
if (right instanceof TemplateNumber)
{
right = ( (TemplateNumber) right).getAsNumber();
}
/*
* Only compare Numbers
*/
if ( !( left instanceof Number ) || !( right instanceof Number ))
{
String msg = (!(left instanceof Number) ? "Left" : "Right")
+ " side of '>=' operation is not a valid Number at "
+ Log.formatFileString(this);
if (rsvc.getBoolean(RuntimeConstants.RUNTIME_REFERENCES_STRICT, false))
{
throw new VelocityException(msg);
}
log.error(msg);
return false;
}
return MathUtils.compare ( (Number)left,(Number)right) == -1;
}
/**
* @see bboss.org.apache.velocity.runtime.parser.node.SimpleNode#value(bboss.org.apache.velocity.context.InternalContextAdapter)
*/
public Object value(InternalContextAdapter context)
throws MethodInvocationException
{
boolean val = evaluate(context);
return val ? Boolean.TRUE : Boolean.FALSE;
}
}