1 /*
2  * Copyright (C) 2007 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.dx.rop.cst;
18 
19 import com.android.dx.rop.type.Type;
20 import com.android.dx.util.Hex;
21 
22 /**
23  * Constants of type {@code CONSTANT_Integer_info}.
24  */
25 public final class CstInteger
26         extends CstLiteral32 {
27     /** {@code non-null;} array of cached instances */
28     private static final CstInteger[] cache = new CstInteger[511];
29 
30     /** {@code non-null;} instance representing {@code -1} */
31     public static final CstInteger VALUE_M1 = make(-1);
32 
33     /** {@code non-null;} instance representing {@code 0} */
34     public static final CstInteger VALUE_0 = make(0);
35 
36     /** {@code non-null;} instance representing {@code 1} */
37     public static final CstInteger VALUE_1 = make(1);
38 
39     /** {@code non-null;} instance representing {@code 2} */
40     public static final CstInteger VALUE_2 = make(2);
41 
42     /** {@code non-null;} instance representing {@code 3} */
43     public static final CstInteger VALUE_3 = make(3);
44 
45     /** {@code non-null;} instance representing {@code 4} */
46     public static final CstInteger VALUE_4 = make(4);
47 
48     /** {@code non-null;} instance representing {@code 5} */
49     public static final CstInteger VALUE_5 = make(5);
50 
51     /**
52      * Makes an instance for the given value. This may (but does not
53      * necessarily) return an already-allocated instance.
54      *
55      * @param value the {@code int} value
56      * @return {@code non-null;} the appropriate instance
57      */
make(int value)58     public static CstInteger make(int value) {
59         /*
60          * Note: No need to synchronize, since we don't make any sort
61          * of guarantee about ==, and it's okay to overwrite existing
62          * entries too.
63          */
64         int idx = (value & 0x7fffffff) % cache.length;
65         CstInteger obj = cache[idx];
66 
67         if ((obj != null) && (obj.getValue() == value)) {
68             return obj;
69         }
70 
71         obj = new CstInteger(value);
72         cache[idx] = obj;
73         return obj;
74     }
75 
76     /**
77      * Constructs an instance. This constructor is private; use {@link #make}.
78      *
79      * @param value the {@code int} value
80      */
CstInteger(int value)81     private CstInteger(int value) {
82         super(value);
83     }
84 
85     /** {@inheritDoc} */
86     @Override
toString()87     public String toString() {
88         int value = getIntBits();
89         return "int{0x" + Hex.u4(value) + " / " + value + '}';
90     }
91 
92     /** {@inheritDoc} */
93     @Override
getType()94     public Type getType() {
95         return Type.INT;
96     }
97 
98     /** {@inheritDoc} */
99     @Override
typeName()100     public String typeName() {
101         return "int";
102     }
103 
104     /** {@inheritDoc} */
105     @Override
toHuman()106     public String toHuman() {
107         return Integer.toString(getIntBits());
108     }
109 
110     /**
111      * Gets the {@code int} value.
112      *
113      * @return the value
114      */
getValue()115     public int getValue() {
116         return getIntBits();
117     }
118 }
119