| package org.apache.helix.store; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.util.Comparator; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class PropertyJsonComparator<T> implements Comparator<T> { |
| static private Logger LOG = LoggerFactory.getLogger(PropertyJsonComparator.class); |
| private final PropertyJsonSerializer<T> _serializer; |
| |
| public PropertyJsonComparator(Class<T> clazz) { |
| _serializer = new PropertyJsonSerializer<T>(clazz); |
| } |
| |
| @Override |
| public int compare(T arg0, T arg1) { |
| if (arg0 == null && arg1 == null) { |
| return 0; |
| } else if (arg0 == null && arg1 != null) { |
| return -1; |
| } else if (arg0 != null && arg1 == null) { |
| return 1; |
| } else { |
| try { |
| String s0 = new String(_serializer.serialize(arg0)); |
| String s1 = new String(_serializer.serialize(arg1)); |
| |
| return s0.compareTo(s1); |
| } catch (PropertyStoreException e) { |
| // e.printStackTrace(); |
| LOG.warn(e.getMessage()); |
| return -1; |
| } |
| } |
| } |
| |
| } |