JSJavaKlass.java revision 9883:903a2e023ffb 
1/*
2 * Copyright (c) 2004, 2007, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25package sun.jvm.hotspot.utilities.soql;
26
27import java.util.*;
28import sun.jvm.hotspot.oops.*;
29import sun.jvm.hotspot.utilities.*;
30
31/**
32   This is JavaScript wrapper for Klass.
33*/
34public abstract class JSJavaKlass {
35    private static final int FIELD_SUPER_CLASS    = 0;
36    private static final int FIELD_NAME           = 1;
37    private static final int FIELD_IS_ARRAY_CLASS = 2;
38    private static final int FIELD_UNDEFINED      = -1;
39
40    public JSJavaKlass(Klass klass, JSJavaFactory factory) {
41        this.factory = factory;
42        this.klass = klass;
43    }
44
45    public final Klass getKlass() {
46        return klass;
47    }
48
49    public JSJavaClass getJSJavaClass() {
50        return (JSJavaClass) factory.newJSJavaObject(getKlass().getJavaMirror());
51    }
52
53    public Object getMetaClassFieldValue(String name) {
54        int fieldID = getFieldID(name);
55        switch (fieldID) {
56        case FIELD_SUPER_CLASS: {
57            JSJavaKlass jk = factory.newJSJavaKlass(getKlass().getSuper());
58            return (jk != null) ? jk.getJSJavaClass() : null;
59        }
60        case FIELD_NAME:
61            return getName();
62        case FIELD_IS_ARRAY_CLASS:
63            return Boolean.valueOf(isArray());
64        case FIELD_UNDEFINED:
65        default:
66            return ScriptObject.UNDEFINED;
67        }
68    }
69
70    public boolean hasMetaClassField(String name) {
71        return getFieldID(name) != FIELD_UNDEFINED;
72    }
73
74
75    public String[] getMetaClassFieldNames() {
76        String[] res = { "name", "superClass", "isArrayClass" };
77        return res;
78    }
79
80    public abstract String getName();
81    public abstract boolean isArray();
82
83    //-- Internals only below this point
84    private static Map fields = new HashMap();
85    private static void addField(String name, int fieldId) {
86        fields.put(name, new Integer(fieldId));
87    }
88
89    private static int getFieldID(String name) {
90        Integer res = (Integer) fields.get(name);
91        return (res != null)? res.intValue() : FIELD_UNDEFINED;
92    }
93
94    static {
95        addField("base", FIELD_SUPER_CLASS);
96        addField("baseClass", FIELD_SUPER_CLASS);
97        addField("superClass", FIELD_SUPER_CLASS);
98        addField("name", FIELD_NAME);
99        addField("isArrayClass", FIELD_IS_ARRAY_CLASS);
100    }
101
102    protected final JSJavaFactory factory;
103    private final Klass klass;
104}
105