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1
28
29 package com.caucho.widget.impl;
30
31 import com.caucho.util.L10N;
32 import com.caucho.widget.WidgetException;
33
34 import javax.script.*;
35
36 public class WidgetScript
37 {
38 private static final L10N L = new L10N(WidgetScript.class);
39
40 private ScriptEngineManager _scriptEngineManager;
41
42 private String _text;
43 private String _language = "js";
44
45 private ScriptEngine _scriptEngine;
46 private CompiledScript _compiledScript;
47
48 public WidgetScript()
49 {
50 _scriptEngineManager = new ScriptEngineManager();
51 }
52
53 void setLanguage(String language)
54 {
55 if (_language == null)
56 throw new IllegalArgumentException(L.l("`{0}' cannot be null", "language"));
57
58 _language = language;
59 }
60
61 public void setText(String text)
62 {
63 _text = text;
64 }
65
66 public void init()
67 throws WidgetException
68 {
69 if (_text == null || _text.length() == 0)
70 throw new WidgetException(L.l("script has no contents"));
71 }
72
73 public void compile()
74 throws WidgetException
75 {
76 ScriptEngine engine = _scriptEngineManager.getEngineByName(_language);
77
78 if (engine == null)
79 throw new IllegalArgumentException(L.l("No script engine found for language `{0}'", _language));
80
81 _scriptEngine = engine;
82
83 if (engine instanceof Compilable) {
84 Compilable compilable = (Compilable) _scriptEngine;
85
86 try {
87 _compiledScript = compilable.compile(_text);
88 }
89 catch (ScriptException e) {
90 throw new WidgetException(e);
91 }
92 }
93 }
94
95 public void exec(WidgetScriptContext scriptContext)
96 throws WidgetException
97 {
98 try {
99 if (_compiledScript != null)
100 _compiledScript.eval(scriptContext);
101 else
102 _scriptEngine.eval(_text, scriptContext);
103 }
104 catch (Exception e) {
105 throw new WidgetException(e);
106 }
107 }
108 }
109 |
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