Source Code Cross Referenced for CVMMemberNameEntry.java in  » 6.0-JDK-Modules » j2me » vm » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » vm 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * @(#)CVMMemberNameEntry.java	1.8 06/10/10
03:         *
04:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.  
05:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
06:         *   
07:         * This program is free software; you can redistribute it and/or  
08:         * modify it under the terms of the GNU General Public License version  
09:         * 2 only, as published by the Free Software Foundation.   
10:         *   
11:         * This program is distributed in the hope that it will be useful, but  
12:         * WITHOUT ANY WARRANTY; without even the implied warranty of  
13:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
14:         * General Public License version 2 for more details (a copy is  
15:         * included at /legal/license.txt).   
16:         *   
17:         * You should have received a copy of the GNU General Public License  
18:         * version 2 along with this work; if not, write to the Free Software  
19:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
20:         * 02110-1301 USA   
21:         *   
22:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
23:         * Clara, CA 95054 or visit www.sun.com if you need additional  
24:         * information or have any questions. 
25:         *
26:         */
27:        package vm;
28:
29:        import java.util.Vector;
30:
31:        /*
32:         * Collect member names. Turn them into little integers.
33:         * Build a hash table of them for writing out to the romjava image.
34:         */
35:        public class CVMMemberNameEntry {
36:            /* instance members */
37:            public String name;
38:            public CVMMemberNameEntry next;
39:            public int entryNo;
40:
41:            /* static members */
42:            public final static int NMEMBERNAMEHASH = 41 * 13;
43:            public static CVMMemberNameEntry hash[] = new CVMMemberNameEntry[NMEMBERNAMEHASH];
44:            static int nextEntryNo = 0;
45:            public static Vector table = new Vector();
46:
47:            /* constructor &c */
48:
49:            static synchronized void enlist(CVMMemberNameEntry x, int xhash) {
50:                x.entryNo = nextEntryNo++;
51:                table.addElement(x);
52:                x.next = hash[xhash];
53:                hash[xhash] = x;
54:            }
55:
56:            CVMMemberNameEntry(String myname, int myhash) {
57:                name = myname;
58:                enlist(this , myhash);
59:            }
60:
61:            /* static methods */
62:            /*
63:             * We use a very simple minded name hashing scheme.
64:             * Based on the LAST few letters of the name, which are
65:             * the most likely to differ, I believe.
66:             * Same as for CVMDataType.
67:             */
68:            public static int computeHash(String name) {
69:                int v = 0;
70:                int t = name.length();
71:                int n = Math.min(t, 7);
72:                t -= n;
73:                while (n-- > 0) {
74:                    v = (v * 19) + name.charAt(t + n) - '/';
75:                }
76:                return v;
77:            }
78:
79:            public static int lookupEnter(String name) {
80:                int hval = (int) (((long) (computeHash(name)) & 0xffffffffL) % NMEMBERNAMEHASH);
81:                name = name.intern();
82:                CVMMemberNameEntry mne;
83:                for (mne = hash[hval]; mne != null; mne = mne.next) {
84:                    if (mne.name == name)
85:                        return mne.entryNo;
86:                }
87:                return new CVMMemberNameEntry(name, hval).entryNo;
88:            }
89:
90:            public static int tableSize() {
91:                return nextEntryNo;
92:            }
93:        }
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