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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * 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.sshd.common.util.io;

import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.nio.channels.Channel;
import java.util.concurrent.atomic.AtomicBoolean;

/**
 * A {@code /dev/null} input stream
 * 
 * @author Apache MINA SSHD Project
 */
public class NullInputStream extends InputStream implements Channel {
    private final AtomicBoolean open = new AtomicBoolean(true);

    public NullInputStream() {
        super();
    }

    @Override
    public boolean isOpen() {
        return open.get();
    }

    @Override
    public int read() throws IOException {
        if (!isOpen()) {
            throw new EOFException("Stream is closed for reading one value");
        }
        return -1;
    }

    @Override
    public int read(byte[] b, int off, int len) throws IOException {
        if (!isOpen()) {
            throw new EOFException("Stream is closed for reading " + len + " bytes");
        }
        return -1;
    }

    @Override
    public long skip(long n) throws IOException {
        if (!isOpen()) {
            throw new EOFException("Stream is closed for skipping " + n + " bytes");
        }
        return 0L;
    }

    @Override
    public int available() throws IOException {
        if (!isOpen()) {
            throw new EOFException("Stream is closed for availability query");
        }
        return 0;
    }

    @Override
    public synchronized void reset() throws IOException {
        if (!isOpen()) {
            throw new EOFException("Stream is closed for reset");
        }
    }

    @Override
    public void close() throws IOException {
        if (open.getAndSet(false)) {
            // noinspection UnnecessaryReturnStatement
            return; // debug breakpoint
        }
    }
}