Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 {
    public static ByteBuffer rightSize(ByteBuffer in) {
        if (in == null) {
            return null;
        }
        if (wrapsFullArray(in)) {
            return in;
        }
        return ByteBuffer.wrap(byteBufferToByteArray(in));
    }

    public static boolean wrapsFullArray(ByteBuffer byteBuffer) {
        return byteBuffer.hasArray() && byteBuffer.position() == 0 && byteBuffer.arrayOffset() == 0
                && byteBuffer.remaining() == byteBuffer.capacity();
    }

    public static byte[] byteBufferToByteArray(ByteBuffer byteBuffer) {
        if (wrapsFullArray(byteBuffer)) {
            return byteBuffer.array();
        }
        byte[] target = new byte[byteBuffer.remaining()];
        byteBufferToByteArray(byteBuffer, target, 0);
        return target;
    }

    public static int byteBufferToByteArray(ByteBuffer byteBuffer, byte[] target, int offset) {
        int remaining = byteBuffer.remaining();
        System.arraycopy(byteBuffer.array(), byteBuffer.arrayOffset() + byteBuffer.position(), target, offset,
                remaining);
        return remaining;
    }
}