1
2
3
4
5
6
7
8
9
10 package org.mule.module.scripting.expression;
11
12 import org.mule.api.MuleContext;
13 import org.mule.api.MuleMessage;
14 import org.mule.api.MuleRuntimeException;
15 import org.mule.api.context.MuleContextAware;
16 import org.mule.api.expression.ExpressionEvaluator;
17 import org.mule.api.lifecycle.Disposable;
18 import org.mule.api.lifecycle.InitialisationException;
19 import org.mule.config.i18n.CoreMessages;
20 import org.mule.module.scripting.component.Scriptable;
21
22 import java.util.Map;
23 import java.util.WeakHashMap;
24
25 import javax.script.Bindings;
26 import javax.script.ScriptException;
27
28
29
30
31
32
33
34 public abstract class AbstractScriptExpressionEvaluator implements ExpressionEvaluator, Disposable, MuleContextAware
35 {
36 protected Map cache = new WeakHashMap(8);
37
38 protected MuleContext muleContext;
39
40 public void setMuleContext(MuleContext context)
41 {
42 this.muleContext = context;
43 }
44
45
46
47
48
49
50
51
52 public Object evaluate(String expression, MuleMessage message)
53 {
54 Scriptable script = getScript(expression);
55 script.setMuleContext(muleContext);
56 Bindings bindings = script.getScriptEngine().createBindings();
57 script.populateBindings(bindings, message);
58
59 try
60 {
61 return script.runScript(bindings);
62 }
63 catch (ScriptException e)
64 {
65 return null;
66 }
67 }
68
69
70
71
72
73
74 public void setName(String name)
75 {
76 throw new UnsupportedOperationException("setName");
77 }
78
79 protected Scriptable getScript(String expression)
80 {
81 Scriptable script = (Scriptable)cache.get(expression);
82 if (script==null)
83 {
84 script = new Scriptable(muleContext);
85 script.setScriptEngineName(getName());
86 script.setScriptText(expression);
87 try
88 {
89 script.initialise();
90 }
91 catch (InitialisationException e)
92 {
93 throw new MuleRuntimeException(
94 CoreMessages.initialisationFailure("An error occurred initialising script."), e);
95 }
96 cache.put(expression, script);
97 }
98 return script;
99 }
100
101
102
103
104
105
106 public void dispose()
107 {
108 cache.clear();
109 }
110 }