/**
* 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.camel.processor.resequencer;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
/**
* Compares elements of an {@link Exchange} sequence by comparing
* <code>long</code> values returned by this comparator's
* <code>expression</code>.
*
* @version
*/
public class DefaultExchangeComparator implements ExpressionResultComparator {
private Expression expression;
@Override
public void setExpression(Expression expression) {
this.expression = expression;
}
@Override
public boolean predecessor(Exchange o1, Exchange o2) {
long n1 = getSequenceNumber(o1);
long n2 = getSequenceNumber(o2);
return n1 == (n2 - 1L);
}
@Override
public boolean successor(Exchange o1, Exchange o2) {
long n1 = getSequenceNumber(o1);
long n2 = getSequenceNumber(o2);
return n2 == (n1 - 1L);
}
@Override
public int compare(Exchange o1, Exchange o2) {
Long n1 = getSequenceNumber(o1);
Long n2 = getSequenceNumber(o2);
return n1.compareTo(n2);
}
private Long getSequenceNumber(Exchange exchange) {
return expression.evaluate(exchange, Long.class);
}
@Override
public boolean isValid(Exchange exchange) {
Long num = null;
try {
num = expression.evaluate(exchange, Long.class);
} catch (Exception e) {
// ignore
}
return num != null;
}
@Override
public String toString() {
return "Comparator[" + expression + "]";
}
}