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The ActiveMQ Client implementation
/**
* 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.activemq.filter;
import javax.jms.JMSException;
/**
* A filter performing a comparison of two objects
*
*
*/
public abstract class LogicExpression extends BinaryExpression implements BooleanExpression {
/**
* @param left
* @param right
*/
public LogicExpression(BooleanExpression left, BooleanExpression right) {
super(left, right);
}
public static BooleanExpression createOR(BooleanExpression lvalue, BooleanExpression rvalue) {
return new LogicExpression(lvalue, rvalue) {
public Object evaluate(MessageEvaluationContext message) throws JMSException {
Boolean lv = (Boolean)left.evaluate(message);
if (lv != null && lv.booleanValue()) {
return Boolean.TRUE;
}
Boolean rv = (Boolean)right.evaluate(message);
if (rv != null && rv.booleanValue()) {
return Boolean.TRUE;
}
if (lv == null || rv == null) {
return null;
}
return Boolean.FALSE;
}
public String getExpressionSymbol() {
return "OR";
}
};
}
public static BooleanExpression createAND(BooleanExpression lvalue, BooleanExpression rvalue) {
return new LogicExpression(lvalue, rvalue) {
public Object evaluate(MessageEvaluationContext message) throws JMSException {
Boolean lv = (Boolean)left.evaluate(message);
if (lv != null && !lv.booleanValue()) {
return Boolean.FALSE;
}
Boolean rv = (Boolean)right.evaluate(message);
if (rv != null && !rv.booleanValue()) {
return Boolean.FALSE;
}
if (lv == null || rv == null) {
return null;
}
return Boolean.TRUE;
}
public String getExpressionSymbol() {
return "AND";
}
};
}
public abstract Object evaluate(MessageEvaluationContext message) throws JMSException;
public boolean matches(MessageEvaluationContext message) throws JMSException {
Object object = evaluate(message);
return object != null && object == Boolean.TRUE;
}
}