Java ByteBuffer Read readBooleanArray(ByteBuffer in)

Description

read Boolean Array

License

Apache License

Declaration

public static boolean[] readBooleanArray(ByteBuffer in) 

Method Source Code

//package com.java2s;
/*/*from  w  w w .  j a  v  a 2 s .co  m*/
 * 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 boolean[] readBooleanArray(ByteBuffer in) {
        int len = readVInt(in);
        if (len < 0)
            return null;

        boolean[] array = new boolean[len];
        byte b_true = (byte) 1;
        for (int i = 0; i < array.length; i++) {
            byte temp = in.get();
            if (temp == b_true)
                array[i] = true;
            else
                array[i] = false;
        }
        return array;
    }

    public static int readVInt(ByteBuffer in) {
        long n = readVLong(in);
        if ((n > Integer.MAX_VALUE) || (n < Integer.MIN_VALUE)) {
            throw new IllegalArgumentException(
                    "value too long to fit in integer");
        }
        return (int) n;
    }

    public static long readVLong(ByteBuffer in) {
        byte firstByte = in.get();
        int len = decodeVIntSize(firstByte);
        if (len == 1) {
            return firstByte;
        }
        long i = 0;
        for (int idx = 0; idx < len - 1; idx++) {
            byte b = in.get();
            i = i << 8;
            i = i | (b & 0xFF);
        }
        return (isNegativeVInt(firstByte) ? (i ^ -1L) : i);
    }

    private static int decodeVIntSize(byte value) {
        if (value >= -112) {
            return 1;
        } else if (value < -120) {
            return -119 - value;
        }
        return -111 - value;
    }

    private static boolean isNegativeVInt(byte value) {
        return value < -120 || (value >= -112 && value < 0);
    }
}

Related

1. readAllLeftBytes(ByteBuffer buffer)
2. readASCII(ByteBuffer buffer)
3. readAsciiString(MappedByteBuffer buffer, int pos, int length)
4. readBE(ByteBuffer bb, int elementWidth)
5. readBoolean(ByteBuffer buff)
6. readBuf(ByteBuffer buffer)
7. readBuffer(ByteChannel channel, ByteBuffer buffer)
8. readBufferFully(FileChannel fc, ByteBuffer buf, int startPos)
9. readByteBuffer(ByteBuffer buf)