Increase ByteBuffer's capacity. - Java java.nio

Java examples for java.nio:ByteBuffer

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Description

Increase ByteBuffer's capacity.

Demo Code

/*/* w ww. j  ava 2s.com*/
 * Copyright 2004-2005 the original author or authors.
 *
 * 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;

public class Main {
    /**
     * Increase ByteBuffer's capacity.
     * 
     * @param buffer
     *       the ByteBuffer want to increase capacity
     * @param size
     *       increased size
     * @return
     *      increased capacity ByteBuffer
     * @throws IllegalArgumentException
     *       if size less than 0 or buffer is null
     */
    public static ByteBuffer increaseCapacity(ByteBuffer buffer, int size)
            throws IllegalArgumentException {
        if (buffer == null)
            throw new IllegalArgumentException("buffer is null");
        if (size < 0)
            throw new IllegalArgumentException("size less than 0");

        int capacity = buffer.capacity() + size;
        ByteBuffer result = allocate(capacity, buffer.isDirect());
        buffer.flip();
        result.put(buffer);
        return result;
    }

    /**
     * Allocate ByteBuffer.
     * 
     * @param capacity
     *       ByteBuffer capacity
     * @param direct
     *       allocate DirectByteBuffer
     * @return
     *       allocated ByteBuffer
     * @throws IllegalArgumentException
     *       if capacity is negative
     */
    public static ByteBuffer allocate(int capacity, boolean direct)
            throws IllegalArgumentException {
        if (capacity < 0)
            throw new IllegalArgumentException("capacity can't be negative");
        return direct ? ByteBuffer.allocateDirect(capacity) : ByteBuffer
                .allocate(capacity);
    }
}

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