aboutsummaryrefslogtreecommitdiffstats
path: root/trunk/infrastructure/rhino1_7R1/examples/Foo.java
blob: bca1b79f12fb8762516e4483599bb8f90c64c82c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Rhino code, released
 * May 6, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1997-1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License Version 2 or later (the "GPL"), in which
 * case the provisions of the GPL are applicable instead of those above. If
 * you wish to allow use of your version of this file only under the terms of
 * the GPL and not to allow others to use your version of this file under the
 * MPL, indicate your decision by deleting the provisions above and replacing
 * them with the notice and other provisions required by the GPL. If you do
 * not delete the provisions above, a recipient may use your version of this
 * file under either the MPL or the GPL.
 *
 * ***** END LICENSE BLOCK ***** */

import org.mozilla.javascript.*;

/**
 * An example host object class.
 *
 * Here's a shell session showing the Foo object in action:
 * <pre>
 * js> defineClass("Foo")
 * js> foo = new Foo();         <i>A constructor call, see <a href="#Foo">Foo</a> below.</i>
 * [object Foo]                 <i>The "Foo" here comes from <a href"#getClassName">getClassName</a>.</i>
 * js> foo.counter;             <i>The counter property is defined by the <code>defineProperty</code></i>
 * 0                            <i>call below and implemented by the <a href="#getCounter">getCounter</a></i>
 * js> foo.counter;             <i>method below.</i>
 * 1
 * js> foo.counter;
 * 2
 * js> foo.resetCounter();      <i>Results in a call to <a href="#resetCounter">resetCounter</a>.</i>
 * js> foo.counter;             <i>Now the counter has been reset.</i>
 * 0
 * js> foo.counter;
 * 1
 * js> bar = new Foo(37);       <i>Create a new instance.</i>
 * [object Foo]
 * js> bar.counter;             <i>This instance's counter is distinct from</i>
 * 37                           <i>the other instance's counter.</i>
 * js> foo.varargs(3, "hi");    <i>Calls <a href="#varargs">varargs</a>.</i>
 * this = [object Foo]; args = [3, hi]
 * js> foo[7] = 34;             <i>Since we extended ScriptableObject, we get</i>
 * 34                           <i>all the behavior of a JavaScript object</i>
 * js> foo.a = 23;              <i>for free.</i>
 * 23
 * js> foo.a + foo[7];
 * 57
 * js>
 * </pre>
 *
 * @see org.mozilla.javascript.Context
 * @see org.mozilla.javascript.Scriptable
 * @see org.mozilla.javascript.ScriptableObject
 *
 * @author Norris Boyd
 */

public class Foo extends ScriptableObject {

    /**
     * The zero-parameter constructor.
     *
     * When Context.defineClass is called with this class, it will
     * construct Foo.prototype using this constructor.
     */
    public Foo() {
    }

    /**
     * The Java method defining the JavaScript Foo constructor.
     *
     * Takes an initial value for the counter property.
     * Note that in the example Shell session above, we didn't
     * supply a argument to the Foo constructor. This means that
     * the Undefined value is used as the value of the argument,
     * and when the argument is converted to an integer, Undefined
     * becomes 0.
     */
    public Foo(int counterStart) {
        counter = counterStart;
    }

    /**
     * Returns the name of this JavaScript class, "Foo".
     */
    public String getClassName() {
        return "Foo";
    }

    /**
     * The Java method defining the JavaScript resetCounter function.
     *
     * Resets the counter to 0.
     */
    public void jsFunction_resetCounter() {
        counter = 0;
    }

    /**
     * The Java method implementing the getter for the counter property.
     * <p>
     * If "setCounter" had been defined in this class, the runtime would
     * call the setter when the property is assigned to.
     */
    public int jsGet_counter() {
        return counter++;
    }

    /**
     * An example of a variable-arguments method.
     *
     * All variable arguments methods must have the same number and
     * types of parameters, and must be static. <p>
     * @param cx the Context of the current thread
     * @param thisObj the JavaScript 'this' value.
     * @param args the array of arguments for this call
     * @param funObj the function object of the invoked JavaScript function
     *               This value is useful to compute a scope using
     *               Context.getTopLevelScope().
     * @return computes the string values and types of 'this' and
     * of each of the supplied arguments and returns them in a string.
     *
     * @see org.mozilla.javascript.ScriptableObject#getTopLevelScope
     */
    public static Object jsFunction_varargs(Context cx, Scriptable thisObj,
                                            Object[] args, Function funObj)
    {
        StringBuffer buf = new StringBuffer();
        buf.append("this = ");
        buf.append(Context.toString(thisObj));
        buf.append("; args = [");
        for (int i=0; i < args.length; i++) {
            buf.append(Context.toString(args[i]));
            if (i+1 != args.length)
                buf.append(", ");
        }
        buf.append("]");
        return buf.toString();
    }

    /**
     * A piece of private data for this class.
     */
    private int counter;
}