| /* |
| * Copyright 1999-2011 Alibaba Group. |
| * |
| * Licensed 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 com.alibaba.dubbo.rpc.cluster.merger; |
| |
| import com.alibaba.dubbo.rpc.cluster.Merger; |
| |
| import java.lang.reflect.Array; |
| |
| /** |
| * @author <a href="mailto:gang.lvg@alibaba-inc.com">kimi</a> |
| */ |
| public class ArrayMerger implements Merger<Object[]> { |
| |
| public static final ArrayMerger INSTANCE = new ArrayMerger(); |
| |
| public Object[] merge(Object[]... others) { |
| if (others.length == 0) { |
| return null; |
| } |
| int totalLen = 0; |
| for (int i = 0; i < others.length; i++) { |
| Object item = others[i]; |
| if (item != null && item.getClass().isArray()) { |
| totalLen += Array.getLength(item); |
| } else { |
| throw new IllegalArgumentException( |
| new StringBuilder(32).append(i + 1) |
| .append("th argument is not an array").toString()); |
| } |
| } |
| |
| if (totalLen == 0) { |
| return null; |
| } |
| |
| Class<?> type = others[0].getClass().getComponentType(); |
| |
| Object result = Array.newInstance(type, totalLen); |
| int index = 0; |
| for (Object array : others) { |
| for (int i = 0; i < Array.getLength(array); i++) { |
| Array.set(result, index++, Array.get(array, i)); |
| } |
| } |
| return (Object[])result; |
| } |
| |
| } |