| /******************************************************************************* |
| * Copyright (c) 2005, 2012 Oracle. All rights reserved. |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License 2.0, which accompanies this distribution |
| * and is available at https://www.eclipse.org/legal/epl-2.0/. |
| * |
| * Contributors: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.common.utility.internal.io; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import org.eclipse.jpt.common.utility.internal.ObjectTools; |
| |
| /** |
| * This is an input stream that does nothing. |
| * It returns nothing. |
| * Performance should be pretty good.... |
| */ |
| public final class NullInputStream |
| extends InputStream |
| { |
| // singleton |
| private static InputStream INSTANCE = new NullInputStream(); |
| |
| /** |
| * Return the singleton. |
| */ |
| public static synchronized InputStream instance() { |
| return INSTANCE; |
| } |
| |
| /** |
| * Ensure non-instantiability. |
| */ |
| private NullInputStream() { |
| super(); |
| } |
| |
| @Override |
| public int read() throws IOException { |
| return -1; |
| } |
| |
| @Override |
| public int read(byte[] b) throws IOException { |
| return -1; |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| return -1; |
| } |
| |
| @Override |
| public long skip(long n) throws IOException { |
| return 0; |
| } |
| |
| @Override |
| public String toString() { |
| return ObjectTools.singletonToString(this); |
| } |
| } |