Java ByteBuffer Copy copyFromBufferToBuffer(ByteBuffer out, ByteBuffer in, int sourceOffset, int length)

Description

Copy from one buffer to another from given offset.

License

Apache License

Parameter

Parameter	Description
out	destination buffer
in	source buffer
sourceOffset	offset in the source buffer
length	how many bytes to copy

Declaration

public static void copyFromBufferToBuffer(ByteBuffer out, ByteBuffer in, int sourceOffset, int length) 

Method Source Code

//package com.java2s;
/*/*from w  w  w  .j a v  a  2s  .co  m*/
 * 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.
 */

import java.nio.ByteBuffer;

public class Main {
    /**
     * Copy from one buffer to another from given offset.
     * <p>
     * Note : This will advance the position marker of {@code out} but not change the position maker
     * for {@code in}
     * @param out destination buffer
     * @param in source buffer
     * @param sourceOffset offset in the source buffer
     * @param length how many bytes to copy
     */
    public static void copyFromBufferToBuffer(ByteBuffer out, ByteBuffer in, int sourceOffset, int length) {
        if (in.hasArray() && out.hasArray()) {
            System.arraycopy(in.array(), sourceOffset + in.arrayOffset(), out.array(),
                    out.position() + out.arrayOffset(), length);
            skip(out, length);
        } else {
            for (int i = 0; i < length; ++i) {
                out.put(in.get(sourceOffset + i));
            }
        }
    }

    /**
     * Copy from one buffer to another from given offset. This will be absolute positional copying and
     * won't affect the position of any of the buffers.
     * @param out
     * @param in
     * @param sourceOffset
     * @param destinationOffset
     * @param length
     */
    public static void copyFromBufferToBuffer(ByteBuffer out, ByteBuffer in, int sourceOffset,
            int destinationOffset, int length) {
        if (in.hasArray() && out.hasArray()) {
            System.arraycopy(in.array(), sourceOffset + in.arrayOffset(), out.array(),
                    out.arrayOffset() + destinationOffset, length);
        } else {
            for (int i = 0; i < length; ++i) {
                out.put((destinationOffset + i), in.get(sourceOffset + i));
            }
        }
    }

    /**
     * Increment position in buffer.
     * @param buffer In this buffer.
     * @param length By that many bytes.
     */
    public static void skip(ByteBuffer buffer, int length) {
        buffer.position(buffer.position() + length);
    }
}

Related

1. copyBytes(ByteBuffer bytes)
2. copyBytes(ByteBuffer src, ByteBuffer dst, int length)
3. copyBytesFrom(ByteBuffer bb)
4. copyContentsToArray(ByteBuffer src)
5. copyFileByMappedByteBuffer(String srcFileName, String dstFileName)
6. copyFromBufferToBuffer(ByteBuffer out, ByteBuffer in, int sourceOffset, int length)
7. copyFromStreamToBuffer(ByteBuffer out, DataInputStream in, int length)
8. copyOf(ByteBuffer payload)
9. copyRemaining(ByteBuffer src, ByteBuffer dst)