001/*
002 * Copyright (c) 2007-2015 Concurrent, Inc. All Rights Reserved.
003 *
004 * Project and contact information: http://www.cascading.org/
005 *
006 * This file is part of the Cascading project.
007 *
008 * Licensed under the Apache License, Version 2.0 (the "License");
009 * you may not use this file except in compliance with the License.
010 * You may obtain a copy of the License at
011 *
012 *     http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 */
020
021package cascading.tap;
022
023import java.util.Iterator;
024
025/**
026 * Interface CompositeTap marks {@link Tap} classes as having child Tap instances.
027 * <p/>
028 * This information is required by the planner in order to properly configure the underlying platform.
029 */
030public interface CompositeTap<Child extends Tap>
031  {
032  Iterator<Child> getChildTaps();
033
034  long getNumChildTaps();
035  }