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 }