Merge a list of buffers into a single ByteBuffer. - Java java.nio

Java examples for java.nio:ByteBuffer Int

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Description

Merge a list of buffers into a single ByteBuffer.

Demo Code

/*/*  w ww  . j  av a  2 s  .  c o  m*/
     * Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
     *
     * 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.Buffer;
    import java.nio.ByteBuffer;
    import java.util.List;

    public class Main {
        public static void main(String[] argv) throws Exception {
            List byteBuffers = java.util.Arrays.asList("asdf", "java2s.com");
            System.out.println(merge(byteBuffers));
        }

        /**
         * Merge a list of buffers into a single buffer.
         *
         * @param byteBuffers list of ByteBuffer objects
         * @return merged ByteBuffer
         */
        public static ByteBuffer merge(List<ByteBuffer> byteBuffers) {
    if (byteBuffers == null || byteBuffers.size() == 0) {
        return ByteBuffer.allocate(0);
    } else if (byteBuffers.size() == 1) {
        return byteBuffers.get(0);
    } else {
        ByteBuffer fullContent = ByteBuffer.allocate(
                byteBuffers.stream()
                        .mapToInt(Buffer::capacity)
                        .sum()
        );
        byteBuffers.forEach(fullContent::put);
        fullContent.flip();
        return fullContent;
    }
}
    }

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