Java ByteBuffer Size decreaseBufferCapatity(final ByteBuffer byteBuffer, final int size, final int minSize)

Description

decrease Buffer Capatity

License

Apache License

Parameter

Parameter	Description
byteBuffer	a parameter
size	a parameter
minSize	a parameter

Declaration

public static final ByteBuffer decreaseBufferCapatity(final ByteBuffer byteBuffer, final int size,
        final int minSize) 

Method Source Code

//package com.java2s;
/*//from  ww w  .  j  av a2s  .  c  om
 * (C) 2007-2012 Alibaba Group Holding Limited.
 * 
 * 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.
 */

import java.nio.ByteBuffer;

public class Main {
    /**
     * 
     * @param byteBuffer
     * @param size
     * @param minSize
     * @return
     */
    public static final ByteBuffer decreaseBufferCapatity(final ByteBuffer byteBuffer, final int size,
            final int minSize) {
        if (byteBuffer == null) {
            throw new IllegalArgumentException("buffer is null");
        }

        if (minSize <= 0) {
            throw new IllegalArgumentException("minSize must be great than zero");
        }

        if (byteBuffer.capacity() == minSize) {
            return byteBuffer;
        }

        int capacity = byteBuffer.capacity() - size;
        if (capacity < minSize) {
            capacity = minSize;
        }
        if (capacity < byteBuffer.position()) {
            return byteBuffer;
        }
        final ByteBuffer result = byteBuffer.isDirect() ? ByteBuffer.allocateDirect(capacity)
                : ByteBuffer.allocate(capacity);
        result.order(byteBuffer.order());
        byteBuffer.flip();
        result.put(byteBuffer);
        return result;
    }

    public static final void flip(final ByteBuffer[] buffers) {
        if (buffers == null) {
            return;
        }
        for (final ByteBuffer buffer : buffers) {
            if (buffer != null) {
                buffer.flip();
            }
        }
    }
}

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