ActiveMQ example source code file (BooleanStream.java)

This example ActiveMQ source code file (BooleanStream.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - ActiveMQ tags/keywords

booleanstream, booleanstream, io, ioexception, ioexception, nio

The ActiveMQ BooleanStream.java source code

/**
 * 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.
 */
package org.apache.activemq.openwire;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.nio.ByteBuffer;

public final class BooleanStream {

    byte data[] = new byte[48];
    short arrayLimit;
    short arrayPos;
    byte bytePos;

    public boolean readBoolean() throws IOException {
        assert arrayPos <= arrayLimit;
        byte b = data[arrayPos];
        boolean rc = ((b >> bytePos) & 0x01) != 0;
        bytePos++;
        if (bytePos >= 8) {
            bytePos = 0;
            arrayPos++;
        }
        return rc;
    }

    public void writeBoolean(boolean value) throws IOException {
        if (bytePos == 0) {
            arrayLimit++;
            if (arrayLimit >= data.length) {
                // re-grow the array.
                byte d[] = new byte[data.length * 2];
                System.arraycopy(data, 0, d, 0, data.length);
                data = d;
            }
        }
        if (value) {
            data[arrayPos] |= 0x01 << bytePos;
        }
        bytePos++;
        if (bytePos >= 8) {
            bytePos = 0;
            arrayPos++;
        }
    }

    public void marshal(DataOutput dataOut) throws IOException {
        if (arrayLimit < 64) {
            dataOut.writeByte(arrayLimit);
        } else if (arrayLimit < 256) { // max value of unsigned byte
            dataOut.writeByte(0xC0);
            dataOut.writeByte(arrayLimit);
        } else {
            dataOut.writeByte(0x80);
            dataOut.writeShort(arrayLimit);
        }

        dataOut.write(data, 0, arrayLimit);
        clear();
    }

    public void marshal(ByteBuffer dataOut) {
        if (arrayLimit < 64) {
            dataOut.put((byte)arrayLimit);
        } else if (arrayLimit < 256) { // max value of unsigned byte
            dataOut.put((byte)0xC0);
            dataOut.put((byte)arrayLimit);
        } else {
            dataOut.put((byte)0x80);
            dataOut.putShort(arrayLimit);
        }

        dataOut.put(data, 0, arrayLimit);
    }

    public void unmarshal(DataInput dataIn) throws IOException {

        arrayLimit = (short)(dataIn.readByte() & 0xFF);
        if (arrayLimit == 0xC0) {
            arrayLimit = (short)(dataIn.readByte() & 0xFF);
        } else if (arrayLimit == 0x80) {
            arrayLimit = dataIn.readShort();
        }
        if (data.length < arrayLimit) {
            data = new byte[arrayLimit];
        }
        dataIn.readFully(data, 0, arrayLimit);
        clear();
    }

    public void clear() {
        arrayPos = 0;
        bytePos = 0;
    }

    public int marshalledSize() {
        if (arrayLimit < 64) {
            return 1 + arrayLimit;
        } else if (arrayLimit < 256) {
            return 2 + arrayLimit;
        } else {
            return 3 + arrayLimit;
        }
    }

}