    001/*
    002 * Copyright (c) 2007-2017 Xplenty, 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  }