001/*
002 * ====================================================================
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *   http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing,
014 * software distributed under the License is distributed on an
015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
016 * KIND, either express or implied.  See the License for the
017 * specific language governing permissions and limitations
018 * under the License.
019 * ====================================================================
020 *
021 * This software consists of voluntary contributions made by many
022 * individuals on behalf of the Apache Software Foundation.  For more
023 * information on the Apache Software Foundation, please see
024 * <http://www.apache.org/>.
025 *
026 */
027
028package org.apache.http.impl.io;
029
030import java.io.InputStream;
031
032/**
033 * @since 4.4
034 */
035public final class EmptyInputStream extends InputStream {
036
037    public static final EmptyInputStream INSTANCE = new EmptyInputStream();
038
039    private EmptyInputStream() {
040    }
041
042    @Override
043    public int available() {
044        return 0;
045    }
046
047    @Override
048    public void close() {
049    }
050
051    @Override
052    public void mark(final int readLimit) {
053    }
054
055    @Override
056    public boolean markSupported() {
057        return true;
058    }
059
060    @Override
061    public int read() {
062        return -1;
063    }
064
065    @Override
066    public int read(final byte[] buf) {
067        return -1;
068    }
069
070    @Override
071    public int read(final byte[] buf, final int off, final int len) {
072        return -1;
073    }
074
075    @Override
076    public void reset() {
077    }
078
079    @Override
080    public long skip(final long n) {
081        return 0L;
082    }
083}
084