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/* 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.
*/
package org.apache.qpid.filter;
import org.apache.qpid.AMQInternalException;
import org.apache.qpid.client.message.AbstractJMSMessage;
/**
* A filter performing a comparison of two objects
*/
public abstract class LogicExpression extends BinaryExpression implements BooleanExpression
{
public static BooleanExpression createOR(BooleanExpression lvalue, BooleanExpression rvalue)
{
return new LogicExpression(lvalue, rvalue)
{
public Object evaluate(AbstractJMSMessage message) throws AMQInternalException
{
Boolean lv = (Boolean) left.evaluate(message);
// Can we do an OR shortcut??
if ((lv != null) && lv.booleanValue())
{
return Boolean.TRUE;
}
Boolean rv = (Boolean) right.evaluate(message);
return (rv == null) ? null : rv;
}
public String getExpressionSymbol()
{
return "OR";
}
};
}
public static BooleanExpression createAND(BooleanExpression lvalue, BooleanExpression rvalue)
{
return new LogicExpression(lvalue, rvalue)
{
public Object evaluate(AbstractJMSMessage message) throws AMQInternalException
{
Boolean lv = (Boolean) left.evaluate(message);
// Can we do an AND shortcut??
if (lv == null)
{
return null;
}
if (!lv.booleanValue())
{
return Boolean.FALSE;
}
Boolean rv = (Boolean) right.evaluate(message);
return (rv == null) ? null : rv;
}
public String getExpressionSymbol()
{
return "AND";
}
};
}
/**
* @param left
* @param right
*/
public LogicExpression(BooleanExpression left, BooleanExpression right)
{
super(left, right);
}
public abstract Object evaluate(AbstractJMSMessage message) throws AMQInternalException;
public boolean matches(AbstractJMSMessage message) throws AMQInternalException
{
Object object = evaluate(message);
return (object != null) && (object == Boolean.TRUE);
}
}
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