org.apache.activemq.filter.UnaryExpression Maven / Gradle / Ivy
/**
* 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 java.math.BigDecimal;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import javax.jms.JMSException;
/**
* An expression which performs an operation on two expression values
*
*
*/
public abstract class UnaryExpression implements Expression {
private static final BigDecimal BD_LONG_MIN_VALUE = BigDecimal.valueOf(Long.MIN_VALUE);
protected Expression right;
public UnaryExpression(Expression left) {
this.right = left;
}
public static Expression createNegate(Expression left) {
return new UnaryExpression(left) {
public Object evaluate(MessageEvaluationContext message) throws JMSException {
Object rvalue = right.evaluate(message);
if (rvalue == null) {
return null;
}
if (rvalue instanceof Number) {
return negate((Number)rvalue);
}
return null;
}
public String getExpressionSymbol() {
return "-";
}
};
}
public static BooleanExpression createInExpression(PropertyExpression right, List