KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > tc > asm > tree > analysis > IntMap


1 /***
2  * ASM: a very small and fast Java bytecode manipulation framework
3  * Copyright (c) 2000-2005 INRIA, France Telecom
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. Neither the name of the copyright holders nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28  * THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 package com.tc.asm.tree.analysis;
31
32 /**
33  * A fixed size map of integer values.
34  *
35  * @author Eric Bruneton
36  */
37 class IntMap {
38
39     private int size;
40
41     private Object JavaDoc[] keys;
42
43     private int[] values;
44
45     public IntMap(final int size) {
46         this.size = size;
47         this.keys = new Object JavaDoc[size];
48         this.values = new int[size];
49     }
50
51     public int get(final Object JavaDoc key) {
52         int n = size;
53         int h = (key.hashCode() & 0x7FFFFFFF) % n;
54         int i = h;
55         while (keys[i] != key) {
56             i = (i + 1) % n;
57             if (i == h) {
58                 throw new RuntimeException JavaDoc("Cannot find index of " + key);
59             }
60         }
61         return values[i];
62     }
63
64     public void put(final Object JavaDoc key, final int value) {
65         int n = size;
66         int i = (key.hashCode() & 0x7FFFFFFF) % n;
67         while (keys[i] != null) {
68             i = (i + 1) % n;
69         }
70         keys[i] = key;
71         values[i] = value;
72     }
73 }
Popular Tags