001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.activemq.openwire;
018
019import java.io.DataInput;
020import java.io.DataOutput;
021import java.io.IOException;
022import java.nio.ByteBuffer;
023
024public final class BooleanStream {
025
026    byte data[] = new byte[48];
027    short arrayLimit;
028    short arrayPos;
029    byte bytePos;
030
031    public boolean readBoolean() throws IOException {
032        assert arrayPos <= arrayLimit;
033        byte b = data[arrayPos];
034        boolean rc = ((b >> bytePos) & 0x01) != 0;
035        bytePos++;
036        if (bytePos >= 8) {
037            bytePos = 0;
038            arrayPos++;
039        }
040        return rc;
041    }
042
043    public void writeBoolean(boolean value) throws IOException {
044        if (bytePos == 0) {
045            arrayLimit++;
046            if (arrayLimit >= data.length) {
047                // re-grow the array.
048                byte d[] = new byte[data.length * 2];
049                System.arraycopy(data, 0, d, 0, data.length);
050                data = d;
051            }
052        }
053        if (value) {
054            data[arrayPos] |= 0x01 << bytePos;
055        }
056        bytePos++;
057        if (bytePos >= 8) {
058            bytePos = 0;
059            arrayPos++;
060        }
061    }
062
063    public void marshal(DataOutput dataOut) throws IOException {
064        if (arrayLimit < 64) {
065            dataOut.writeByte(arrayLimit);
066        } else if (arrayLimit < 256) { // max value of unsigned byte
067            dataOut.writeByte(0xC0);
068            dataOut.writeByte(arrayLimit);
069        } else {
070            dataOut.writeByte(0x80);
071            dataOut.writeShort(arrayLimit);
072        }
073
074        dataOut.write(data, 0, arrayLimit);
075        clear();
076    }
077
078    public void marshal(ByteBuffer dataOut) {
079        if (arrayLimit < 64) {
080            dataOut.put((byte)arrayLimit);
081        } else if (arrayLimit < 256) { // max value of unsigned byte
082            dataOut.put((byte)0xC0);
083            dataOut.put((byte)arrayLimit);
084        } else {
085            dataOut.put((byte)0x80);
086            dataOut.putShort(arrayLimit);
087        }
088
089        dataOut.put(data, 0, arrayLimit);
090    }
091
092    public void unmarshal(DataInput dataIn) throws IOException {
093
094        arrayLimit = (short)(dataIn.readByte() & 0xFF);
095        if (arrayLimit == 0xC0) {
096            arrayLimit = (short)(dataIn.readByte() & 0xFF);
097        } else if (arrayLimit == 0x80) {
098            arrayLimit = dataIn.readShort();
099        }
100        if (data.length < arrayLimit) {
101            data = new byte[arrayLimit];
102        }
103        dataIn.readFully(data, 0, arrayLimit);
104        clear();
105    }
106
107    public void clear() {
108        arrayPos = 0;
109        bytePos = 0;
110    }
111
112    public int marshalledSize() {
113        if (arrayLimit < 64) {
114            return 1 + arrayLimit;
115        } else if (arrayLimit < 256) {
116            return 2 + arrayLimit;
117        } else {
118            return 3 + arrayLimit;
119        }
120    }
121
122}