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Java > Open Source Codes > org > apache > cocoon > components > flow > javascript > ScriptablePropertyHandler


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
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 package org.apache.cocoon.components.flow.javascript;
17
18 import org.apache.commons.jxpath.DynamicPropertyHandler;
19 import org.mozilla.javascript.Context;
20 import org.mozilla.javascript.Function;
21 import org.mozilla.javascript.JavaScriptException;
22 import org.mozilla.javascript.Scriptable;
23 import org.mozilla.javascript.ScriptableObject;
24 import org.mozilla.javascript.Undefined;
25 import org.mozilla.javascript.Wrapper;
26
27 /**
28  *
29  * @version CVS $Id: ScriptablePropertyHandler.java 30932 2004-07-29 17:35:38Z vgritsenko $
30  */
31 public class ScriptablePropertyHandler implements DynamicPropertyHandler {
32
33     public Object JavaDoc getProperty(Object JavaDoc obj, String JavaDoc propertyName) {
34         Context cx = null;
35         try {
36             cx = Context.enter();
37             Scriptable s = (Scriptable)obj;
38             Object JavaDoc result = ScriptableObject.getProperty(s, propertyName);
39             if (result == Scriptable.NOT_FOUND) {
40                 result = ScriptableObject.getProperty(s, "get" + propertyName.substring(0, 1).toUpperCase() + (propertyName.length() > 1 ? propertyName.substring(1) : ""));
41                 if (result != Scriptable.NOT_FOUND &&
42                     result instanceof Function) {
43                     try {
44                         result = ((Function)result).call(cx,
45                                                          ScriptableObject.getTopLevelScope(s), s, new Object JavaDoc[] {});
46                     } catch (JavaScriptException exc) {
47                         exc.printStackTrace();
48                         result = Undefined.instance;
49                     }
50                 }
51                 if (result == Undefined.instance ||
52                     result == Scriptable.NOT_FOUND) {
53                     result = null;
54                 }
55             } else if (result instanceof Wrapper) {
56                 result = ((Wrapper)result).unwrap();
57             } else if (result == Undefined.instance) {
58                 result = null;
59             }
60             return result;
61         } finally {
62             Context.exit();
63         }
64     }
65     
66     public String JavaDoc[] getPropertyNames(Object JavaDoc obj) {
67         Context.enter();
68         try {
69             Object JavaDoc[] ids;
70             if (obj instanceof ScriptableObject) {
71                 ids = ((ScriptableObject)obj).getAllIds();
72             } else {
73                 ids = ((Scriptable)obj).getIds();
74             }
75             String JavaDoc[] result = new String JavaDoc[ids.length];
76             for (int i = 0; i < result.length; i++) {
77                 result[i] = (String JavaDoc)ids[i];
78             }
79             return result;
80         } finally {
81             Context.exit();
82         }
83     }
84     
85     public void setProperty(Object JavaDoc obj, String JavaDoc propertyName,
86                             Object JavaDoc value) {
87         Context.enter();
88         try {
89             if (!(value == null
90                   || value instanceof String JavaDoc
91                   || value instanceof Number JavaDoc
92                   || value instanceof Boolean JavaDoc)) {
93                 value = Context.toObject(value,
94                                          (Scriptable)obj);
95             }
96             ScriptableObject.putProperty((Scriptable)obj,
97                                          propertyName, value);
98         } finally {
99             Context.exit();
100         }
101     }
102 }
103
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