Copy the source ByteBuffer into the target ByteBuffer at the current position in the target - Java java.nio

Java examples for java.nio:ByteBuffer Int

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Description

Copy the source ByteBuffer into the target ByteBuffer at the current position in the target

Demo Code

/*/*from  www .j  av  a 2  s  .  c  om*/
 * Copyright (c) 2013 Ramon Servadei 
 *  
 * 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.
 */
import java.nio.ByteBuffer;

public class Main{
    public static final int BLOCK_SIZE = 1024;
    /**
     * Copy the source into the target at the current position in the target
     * 
     * @see #copyBytesIntoBuffer(byte[], ByteBuffer)
     */
    public static final ByteBuffer copyBufferIntoBuffer(ByteBuffer source,
            ByteBuffer target) {
        return copyBytesIntoBuffer(ByteBufferUtils.asBytes(source), target);
    }
    /**
     * Copy the data into the buffer, resizing it if needed
     * 
     * @return the {@link ByteBuffer} with the data added to it (resized if needed)
     */
    public static final ByteBuffer copyBytesIntoBuffer(byte[] data,
            ByteBuffer buffer) {
        ByteBuffer localBuf = buffer;
        try {
            if (data.length + localBuf.position() > localBuf.limit()) {
                // resize the buffer
                final ByteBuffer resizedBuffer = ByteBuffer
                        .allocate(localBuf.capacity() + data.length
                                + BLOCK_SIZE);
                final int position = localBuf.position();
                System.arraycopy(localBuf.array(), 0,
                        resizedBuffer.array(), 0, position);
                localBuf = resizedBuffer;
                System.arraycopy(data, 0, localBuf.array(), position,
                        data.length);
                localBuf.position(position + data.length);
            } else {
                System.arraycopy(data, 0, localBuf.array(),
                        localBuf.position(), data.length);
                localBuf.position(localBuf.position() + data.length);
            }
        } catch (RuntimeException e) {
            Log.log(ByteBufferUtils.class, "data.length=" + data.length
                    + ", buffer.array=" + localBuf.array().length
                    + ", buffer=" + localBuf);
            throw e;
        }
        return localBuf;
    }
    /**
     * @return a new byte[] that holds the data in the buffer from 0-limit in the buffer
     */
    public static final byte[] asBytes(ByteBuffer buffer) {
        final byte[] data = new byte[buffer.limit()];
        System.arraycopy(buffer.array(), 0, data, 0, buffer.limit());
        return data;
    }
}

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