| /** |
| * 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 comaprator's |
| * <code>expression</code>. |
| * |
| * @version |
| */ |
| public class DefaultExchangeComparator implements ExpressionResultComparator { |
| |
| private Expression expression; |
| |
| public void setExpression(Expression expression) { |
| this.expression = expression; |
| } |
| |
| public boolean predecessor(Exchange o1, Exchange o2) { |
| long n1 = getSequenceNumber(o1); |
| long n2 = getSequenceNumber(o2); |
| return n1 == (n2 - 1L); |
| } |
| |
| public boolean successor(Exchange o1, Exchange o2) { |
| long n1 = getSequenceNumber(o1); |
| long n2 = getSequenceNumber(o2); |
| return n2 == (n1 - 1L); |
| } |
| |
| 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); |
| } |
| } |