merge ByteBuffer - Java java.nio

Java examples for java.nio:ByteBuffer

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Description

merge ByteBuffer

Demo Code


//package com.java2s;
import java.nio.ByteBuffer;

public class Main {
    static ByteBuffer merge(ByteBuffer buffer, ByteBuffer[] tailBuffers) {

        if ((buffer == null) || (buffer.remaining() == 0)) {
            return merge(tailBuffers);
        }//  w  w w.j a  va  2  s.c o  m

        int size = buffer.remaining();
        for (ByteBuffer byteBuffer : tailBuffers) {
            if (byteBuffer != null) {
                size += byteBuffer.remaining();
            }
        }

        ByteBuffer result = ByteBuffer.allocate(size);
        result.put(buffer);
        for (ByteBuffer byteBuffer : tailBuffers) {
            if (byteBuffer != null) {
                int pos = byteBuffer.position();
                int limit = byteBuffer.limit();
                result.put(byteBuffer);

                byteBuffer.position(pos);
                byteBuffer.limit(limit);
            }
        }

        result.flip();
        return result;
    }

    static ByteBuffer merge(ByteBuffer[] buffers) {

        if ((buffers == null) || (buffers.length == 0)) {
            return ByteBuffer.allocate(0);
        } else {
            int size = 0;
            for (ByteBuffer byteBuffer : buffers) {
                if (byteBuffer != null) {
                    size += byteBuffer.remaining();
                }
            }

            ByteBuffer buffer = ByteBuffer.allocate(size);
            for (ByteBuffer byteBuffer : buffers) {
                if (byteBuffer != null) {
                    int pos = byteBuffer.position();
                    int limit = byteBuffer.limit();
                    buffer.put(byteBuffer);

                    byteBuffer.position(pos);
                    byteBuffer.limit(limit);
                }
            }

            buffer.flip();
            return buffer;
        }
    }

    static ByteBuffer merge(ByteBuffer buffer, ByteBuffer tailBuffer) {
        if ((buffer == null) || (buffer.remaining() == 0)) {
            return tailBuffer;
        }

        if ((tailBuffer == null) || (tailBuffer.remaining() == 0)) {
            return buffer;
        }

        ByteBuffer result = ByteBuffer.allocate(buffer.remaining()
                + tailBuffer.remaining());
        result.put(buffer);
        result.put(tailBuffer);
        result.flip();

        return result;
    }

    public static byte[] merge(byte[] bytes, byte[] tailBytes) {
        byte[] b = new byte[bytes.length + tailBytes.length];

        System.arraycopy(bytes, 0, b, 0, bytes.length);
        System.arraycopy(tailBytes, 0, b, bytes.length, tailBytes.length);

        return b;
    }
}

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