| /** |
| * 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.component.zookeeper; |
| |
| import org.apache.zookeeper.CreateMode; |
| |
| /** |
| * Nodes created with any of Sequential {@link CreateMode}s will have a 10 |
| * character sequence attached to their node names. |
| * <code>SequenceComparator</code> is a Natural comparator used to compare lists |
| * of objects with these appended sequences. |
| */ |
| public class SequenceComparator extends NaturalSortComparator { |
| |
| public static final int ZOOKEEPER_SEQUENCE_LENGTH = 10; |
| |
| @Override |
| public int compare(CharSequence sequencedNode, CharSequence otherSequencedNode) { |
| if (sequencedNode == null && otherSequencedNode == null) { |
| return 0; |
| } |
| if (sequencedNode != null && otherSequencedNode == null) { |
| return 1; |
| } |
| if (sequencedNode == null && otherSequencedNode != null) { |
| return -1; |
| } |
| return super.compare(getZooKeeperSequenceNumber(sequencedNode), getZooKeeperSequenceNumber(otherSequencedNode)); |
| } |
| |
| private CharSequence getZooKeeperSequenceNumber(CharSequence sequencedNodeName) { |
| int len = sequencedNodeName.length(); |
| return sequencedNodeName.subSequence(len - ZOOKEEPER_SEQUENCE_LENGTH, len); |
| } |
| } |