/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.io.output;

import java.io.IOException;
import java.io.OutputStream;

Closed output stream. This stream throws an exception on all attempts to
write something to the stream.
 Typically uses of this class include testing for corner cases in methods that accept an output stream and acting as a sentinel value instead of a null output stream. 
Since:
1.4/**
 * Closed output stream. This stream throws an exception on all attempts to
 * write something to the stream.
 * <p>
 * Typically uses of this class include testing for corner cases in methods
 * that accept an output stream and acting as a sentinel value instead of
 * a {@code null} output stream.
 *
 * @since 1.4
 */
public class ClosedOutputStream extends OutputStream {

    
A singleton.
/**
     * A singleton.
     */
    public static final ClosedOutputStream CLOSED_OUTPUT_STREAM = new ClosedOutputStream();

    
Throws an IOException to indicate that the stream is closed. 
Params:
b – ignored
Throws:
IOException – always thrown/**
     * Throws an {@link IOException} to indicate that the stream is closed.
     *
     * @param b ignored
     * @throws IOException always thrown
     */
    @Override
    public void write(final int b) throws IOException {
        throw new IOException("write(" + b + ") failed: stream is closed");
    }

    
Throws an IOException to indicate that the stream is closed. 
Throws:
IOException – always thrown/**
     * Throws an {@link IOException} to indicate that the stream is closed.
     *
     * @throws IOException always thrown
     */
    @Override
    public void flush() throws IOException {
        throw new IOException("flush() failed: stream is closed");
    }
}