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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.exception.MethodInvocationException;
import org.apache.velocity.exception.VelocityException;
import org.apache.velocity.runtime.RuntimeConstants;
import org.apache.velocity.runtime.parser.Parser;
import org.apache.velocity.util.DuckType;
import org.apache.velocity.util.StringUtils;
/**
* Numeric comparison support<br><br>
*
* @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a>
* @author <a href="mailto:pero@antaramusic.de">Peter Romianowski</a>
* @author Nathan Bubna
*/
public abstract class ASTComparisonNode extends ASTBinaryOperator
{
/**
* @param id
*/
public ASTComparisonNode(int id)
{
super(id);
}
/**
* @param p
* @param id
*/
public ASTComparisonNode(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)
*/
@Override
public Object jjtAccept(ParserVisitor visitor, Object data)
{
return visitor.visit(this, data);
}
/**
* @see org.apache.velocity.runtime.parser.node.SimpleNode#evaluate(org.apache.velocity.context.InternalContextAdapter)
*/
@Override
public boolean evaluate(InternalContextAdapter context) throws MethodInvocationException
{
Object left = jjtGetChild(0).value(context);
Object right = jjtGetChild(1).value(context);
if (left == null || right == null)
{
return compareNull(left, right);
}
Boolean result = compareNumbers(left, right);
if (result == null)
{
result = compareNonNumber(left, right);
}
return result;
}
/**
* Always false by default, != and == subclasses must override this.
* @param left
* @param right
* @return comparison result
*/
public boolean compareNull(Object left, Object right)
{
// if either side is null, log and bail
String msg = (left == null ? "Left" : "Right")
+ " side ("
+ jjtGetChild( (left == null? 0 : 1) ).literal()
+ ") of comparison operation has null value at "
+ StringUtils.formatFileString(this);
if (rsvc.getBoolean(RuntimeConstants.RUNTIME_REFERENCES_STRICT, false))
{
throw new VelocityException(msg, null, rsvc.getLogContext().getStackTrace());
}
log.error(msg);
return false;
}
/**
* compare numbers
* @param left
* @param right
* @return comparison result
*/
public Boolean compareNumbers(Object left, Object right)
{
try
{
left = DuckType.asNumber(left);
}
catch (NumberFormatException nfe) {}
try
{
right = DuckType.asNumber(right);
}
catch (NumberFormatException nfe) {}
// only compare Numbers
if (left instanceof Number && right instanceof Number)
{
return numberTest(MathUtils.compare((Number)left, (Number)right));
}
return null;
}
/**
* get the string representing the mathematical operator
* @return operator string
*/
@Override
public abstract String getLiteralOperator();
/**
* performs the actual comparison
* @param compareResult
* @return comparison result
*/
public abstract boolean numberTest(int compareResult);
public boolean compareNonNumber(Object left, Object right)
{
// by default, log and bail
String msg = (right instanceof Number ? "Left" : "Right")
+ " side of comparison operation is not a number at "
+ StringUtils.formatFileString(this);
if (rsvc.getBoolean(RuntimeConstants.RUNTIME_REFERENCES_STRICT, false))
{
throw new VelocityException(msg, null, rsvc.getLogContext().getStackTrace());
}
log.error(msg);
return false;
}
private String getLiteral(boolean left)
{
return jjtGetChild(left ? 0 : 1).literal();
}
/**
* @see org.apache.velocity.runtime.parser.node.SimpleNode#value(org.apache.velocity.context.InternalContextAdapter)
*/
@Override
public Object value(InternalContextAdapter context) throws MethodInvocationException
{
return evaluate(context);
}
}
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