| /** |
| * 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.storm.trident.tuple; |
| |
| import java.io.Serializable; |
| import java.util.AbstractList; |
| import java.util.List; |
| import org.apache.storm.shade.org.apache.commons.lang.builder.ToStringBuilder; |
| |
| public class ComboList extends AbstractList<Object> { |
| Pointer[] _index; |
| List[] _delegates; |
| |
| public ComboList(List[] delegates, Pointer[] index) { |
| _index = index; |
| _delegates = delegates; |
| } |
| |
| @Override |
| public Object get(int i) { |
| Pointer ptr = _index[i]; |
| return _delegates[ptr.listIndex].get(ptr.subIndex); |
| } |
| |
| @Override |
| public int size() { |
| return _index.length; |
| } |
| |
| public static class Factory implements Serializable { |
| Pointer[] index; |
| int[] sizes; |
| |
| public Factory(int... sizes) { |
| this.sizes = sizes; |
| int total = 0; |
| for (int size : sizes) { |
| total += size; |
| } |
| index = new Pointer[total]; |
| int i = 0; |
| int j = 0; |
| for (int size : sizes) { |
| for (int z = 0; z < size; z++) { |
| index[j] = new Pointer(i, z); |
| j++; |
| } |
| i++; |
| } |
| } |
| |
| public ComboList create(List[] delegates) { |
| if (delegates.length != sizes.length) { |
| throw new RuntimeException("Expected " + sizes.length + " lists, but instead got " + delegates.length + " lists"); |
| } |
| for (int i = 0; i < delegates.length; i++) { |
| List l = delegates[i]; |
| if (l == null || l.size() != sizes[i]) { |
| throw new RuntimeException("Got unexpected delegates to ComboList: " + ToStringBuilder.reflectionToString(delegates)); |
| } |
| } |
| return new ComboList(delegates, index); |
| } |
| } |
| |
| private static class Pointer implements Serializable { |
| int listIndex; |
| int subIndex; |
| |
| public Pointer(int listIndex, int subIndex) { |
| this.listIndex = listIndex; |
| this.subIndex = subIndex; |
| } |
| |
| } |
| } |