    001    /*
    002     * Copyright (c) 2007-2014 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
    021    package cascading.util;
    022
    023    import java.io.IOException;
    024
    025    /**
    026     * SingleValueIterator is a utility class used for quickly presenting a single value to a consumer
    027     * expecting both a {@link java.io.Closeable} and an {@link java.util.Iterator} interface. After returning the Value
    028     * value via {@link #next}, {@link #hasNext()} will return {@code false}.
    029     * <p/>
    030     * This class is especially useful if you do not wish to create a {@link java.util.Collection} to hold a single value
    031     * in which to create an Iterator.
    032     *
    033     * @param <Value>
    034     */
    035    public abstract class SingleValueCloseableIterator<Value> extends SingleValueIterator<Value> implements CloseableIterator<Value>
    036      {
    037
    038      public SingleValueCloseableIterator( Value value )
    039        {
    040        super( value );
    041        }
    042
    043      protected Value getCloseableInput()
    044        {
    045        return value;
    046        }
    047
    048      @Override
    049      public abstract void close() throws IOException;
    050      }