merge Adjacent Buffers - Java java.nio

Java examples for java.nio:ByteBuffer

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Description

merge Adjacent Buffers

Demo Code

/*/*from  ww  w  . ja v  a  2s . c  o  m*/
 * Copyright 2012 Sebastian Annies, Hamburg
 *
 * 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 com.java2s;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static List<ByteBuffer> mergeAdjacentBuffers(
            List<ByteBuffer> samples) {
        ArrayList<ByteBuffer> nuSamples = new ArrayList<ByteBuffer>(
                samples.size());
        for (ByteBuffer buffer : samples) {
            int lastIndex = nuSamples.size() - 1;
            if (lastIndex >= 0
                    && buffer.hasArray()
                    && nuSamples.get(lastIndex).hasArray()
                    && buffer.array() == nuSamples.get(lastIndex).array()
                    && nuSamples.get(lastIndex).arrayOffset()
                            + nuSamples.get(lastIndex).limit() == buffer
                            .arrayOffset()) {
                ByteBuffer oldBuffer = nuSamples.remove(lastIndex);
                ByteBuffer nu = ByteBuffer.wrap(buffer.array(),
                        oldBuffer.arrayOffset(),
                        oldBuffer.limit() + buffer.limit()).slice();
                // We need to slice here since wrap([], offset, length) just sets position and not the arrayOffset.
                nuSamples.add(nu);
            } else if (lastIndex >= 0
                    && buffer instanceof MappedByteBuffer
                    && nuSamples.get(lastIndex) instanceof MappedByteBuffer
                    && nuSamples.get(lastIndex).limit() == nuSamples.get(
                            lastIndex).capacity()
                            - buffer.capacity()) {
                // This can go wrong - but will it?
                ByteBuffer oldBuffer = nuSamples.get(lastIndex);
                oldBuffer.limit(buffer.limit() + oldBuffer.limit());
            } else {
                buffer.reset();
                nuSamples.add(buffer);
            }
        }
        return nuSamples;
    }
}

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