ByteEncodedValue.java revision 2ec8d992d01f60612ec19cd8588f715a7b99d0b4 
1/*
2 * [The "BSD licence"]
3 * Copyright (c) 2009 Ben Gruver
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29package org.jf.dexlib.EncodedValue;
30
31import org.jf.dexlib.Util.Input;
32import org.jf.dexlib.Util.EncodedValueUtils;
33import org.jf.dexlib.Util.AnnotatedOutput;
34
35public class ByteEncodedValue extends EncodedValue {
36    public final byte value;
37
38    /**
39     * Constructs a new <code>ByteEncodedValue</code> by reading the value from the given <code>Input</code> object.
40     * The <code>Input</code>'s cursor should be set to the 2nd byte of the encoded value
41     * @param in The <code>Input</code> object to read from
42     */
43    protected ByteEncodedValue(Input in) {
44        value = (byte)EncodedValueUtils.decodeSignedIntegralValue(in.readBytes(1));
45    }
46
47    /**
48     * Constructs a new <code>ByteEncodedValue</code> with the given value
49     * @param value The value
50     */
51    public ByteEncodedValue(byte value) {
52        this.value = value;
53    }
54
55    /** {@inheritDoc} */
56    public void writeValue(AnnotatedOutput out) {
57        if (out.annotates()) {
58            out.annotate(1, "value_type=" + ValueType.VALUE_BYTE.name() + ",value_arg=0");
59            out.annotate(1, "value: 0x" + Integer.toHexString(value) + " (" + value + ")");
60        }
61        out.writeByte(ValueType.VALUE_BYTE.value);
62        out.writeByte(value);
63    }
64
65    /** {@inheritDoc} */
66    public int placeValue(int offset) {
67        return offset + 2;
68    }
69
70    /** {@inheritDoc} */
71    protected int compareValue(EncodedValue o) {
72        ByteEncodedValue other = (ByteEncodedValue)o;
73
74         return (value<other.value?-1:(value>other.value?1:0));
75    }
76
77    /** {@inheritDoc} */
78    public ValueType getValueType() {
79        return ValueType.VALUE_BYTE;
80    }
81
82    @Override
83    public int hashCode() {
84        return value;
85    }
86}
87