ByteBufferInputStream.java

/*
 * Copyright 2013 Matt Sicker and Contributors
 *
 * Licensed 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 atg.tools.dynunit.test.io;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;

/**
 * An InputStream which reads from a ByteBuffer
 *
 * @author Adam Belmont
 * @version $Id:$
 * @see ByteBuffer
 */
class ByteBufferInputStream
        extends InputStream {
    //-------------------------------------

    /**
     * Class version string
     */

    public static String CLASS_VERSION = "$Id:$";

    private ByteBuffer mBuffer = null;

    public ByteBufferInputStream(ByteBuffer pBuffer) {
        mBuffer = pBuffer;
    }

    public int read(byte b[])
            throws IOException {
        return read(b, 0, b.length);
    }

    public synchronized int read()
            throws IOException {
        if ( !mBuffer.hasRemaining() ) {
            return -1;
        }
        return mBuffer.get();
    }

    public synchronized int read(byte[] bytes, int off, int len)
            throws IOException {
        len = Math.min(len, mBuffer.remaining());
        mBuffer.get(bytes, off, len);
        return len > 0 ? len : -1;
    }
}