Java ByteBuffer Append appendBuffers(ByteBuffer buffer, ByteBuffer buffer1, int incomingBufferSize, int BUFFER_STEP_SIZE)

Here you can find the source of appendBuffers(ByteBuffer buffer, ByteBuffer buffer1, int incomingBufferSize, int BUFFER_STEP_SIZE)

Description

Concatenates two buffers into one.

License

Open Source License

Parameter

Parameter Description
buffer first buffer.
buffer1 second buffer.

Return

concatenation.

Declaration

static ByteBuffer appendBuffers(ByteBuffer buffer, ByteBuffer buffer1, int incomingBufferSize,
        int BUFFER_STEP_SIZE) 

Method Source Code

//package com.java2s;
/*//from   w w  w  . j  av  a2s .c o  m
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * The contents of this file are subject to the terms of either the GNU
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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import java.nio.ByteBuffer;

public class Main {
    /**
     * Concatenates two buffers into one. If buffer given as first argument has enough space for putting
     * the other one, it will be done and the original buffer will be returned. Otherwise new buffer will
     * be created.
     *
     * @param buffer  first buffer.
     * @param buffer1 second buffer.
     * @return concatenation.
     */
    static ByteBuffer appendBuffers(ByteBuffer buffer, ByteBuffer buffer1, int incomingBufferSize,
            int BUFFER_STEP_SIZE) {

        final int limit = buffer.limit();
        final int capacity = buffer.capacity();
        final int remaining = buffer.remaining();
        final int len = buffer1.remaining();

        // buffer1 will be appended to buffer
        if (len < (capacity - limit)) {

            buffer.mark();
            buffer.position(limit);
            buffer.limit(capacity);
            buffer.put(buffer1);
            buffer.limit(limit + len);
            buffer.reset();
            return buffer;
            // Remaining data is moved to left. Then new data is appended
        } else if (remaining + len < capacity) {
            buffer.compact();
            buffer.put(buffer1);
            buffer.flip();
            return buffer;
            // create new buffer
        } else {
            int newSize = remaining + len;
            if (newSize > incomingBufferSize) {
                throw new IllegalArgumentException("Buffer overflow");
            } else {
                final int roundedSize = (newSize % BUFFER_STEP_SIZE) > 0
                        ? ((newSize / BUFFER_STEP_SIZE) + 1) * BUFFER_STEP_SIZE
                        : newSize;
                final ByteBuffer result = ByteBuffer
                        .allocate(roundedSize > incomingBufferSize ? newSize : roundedSize);
                result.put(buffer);
                result.put(buffer1);
                result.flip();
                return result;
            }
        }
    }
}

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