| /* |
| * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved. |
| * |
| * 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.datatorrent.lib.stream; |
| |
| import com.datatorrent.api.DefaultInputPort; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.annotation.InputPortFieldAnnotation; |
| import com.datatorrent.api.annotation.OutputPortFieldAnnotation; |
| import com.datatorrent.api.annotation.Stateless; |
| import com.datatorrent.lib.util.BaseKeyOperator; |
| import java.util.ArrayList; |
| |
| /** |
| * An implementation of BaseKeyOperator that breaks up an ArrayList tuple into Objects. |
| * <p> |
| * Takes in an ArrayList and emits each item in the array; mainly used for |
| * breaking up an ArrayList tuple into Objects. <br> |
| * It is a pass through operator<br> |
| * <br> |
| * <b>Ports</b>:<br> |
| * <b>data</b>: expects ArrayList<K>br> <b>item</b>: emits K<br> |
| * |
| * @displayName: Array List To Item |
| * @category: stream |
| * @tag: arraylist, clone |
| * @since 0.3.3 |
| */ |
| @Stateless |
| public class ArrayListToItem<K> extends BaseKeyOperator<K> |
| { |
| /** |
| * Input data port that takes an arraylist. |
| */ |
| @InputPortFieldAnnotation(name = "data") |
| public final transient DefaultInputPort<ArrayList<K>> data = new DefaultInputPort<ArrayList<K>>() |
| { |
| /** |
| * Emit one item at a time |
| */ |
| @Override |
| public void process(ArrayList<K> tuple) |
| { |
| for (K k : tuple) { |
| item.emit(cloneKey(k)); |
| } |
| } |
| }; |
| |
| /** |
| * Output port that emits an array item. |
| */ |
| @OutputPortFieldAnnotation(name = "item") |
| public final transient DefaultOutputPort<K> item = new DefaultOutputPort<K>(); |
| } |