1/* 2 * Copyright (C) 2014 Square, Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16package okio; 17 18import java.io.IOException; 19 20/** A {@link Sink} which forwards calls to another. Useful for subclassing. */ 21public abstract class ForwardingSink implements Sink { 22 private final Sink delegate; 23 24 public ForwardingSink(Sink delegate) { 25 if (delegate == null) throw new IllegalArgumentException("delegate == null"); 26 this.delegate = delegate; 27 } 28 29 /** {@link Sink} to which this instance is delegating. */ 30 public final Sink delegate() { 31 return delegate; 32 } 33 34 @Override public void write(Buffer source, long byteCount) throws IOException { 35 delegate.write(source, byteCount); 36 } 37 38 @Override public void flush() throws IOException { 39 delegate.flush(); 40 } 41 42 @Override public Timeout timeout() { 43 return delegate.timeout(); 44 } 45 46 @Override public void close() throws IOException { 47 delegate.close(); 48 } 49 50 @Override public String toString() { 51 return getClass().getSimpleName() + "(" + delegate.toString() + ")"; 52 } 53} 54