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1
28
29 package javax.faces.component.html;
30
31 import java.util.*;
32
33 import javax.el.*;
34
35 import javax.faces.*;
36 import javax.faces.application.*;
37 import javax.faces.context.*;
38 import javax.faces.convert.*;
39
40 final class Util
41 {
42 static Object  eval(ValueExpression expr)
43 {
44 try {
45 return expr.getValue(currentELContext());
46 } catch (ELException e) {
47 throw new FacesException(e);
48 }
49 }
50
51 static boolean evalBoolean(ValueExpression expr)
52 {
53 try {
54 return (Boolean ) expr.getValue(currentELContext());
55 } catch (ELException e) {
56 throw new FacesException(e);
57 }
58 }
59
60 static int evalInt(ValueExpression expr)
61 {
62 try {
63 return (Integer ) expr.getValue(currentELContext());
64 } catch (ELException e) {
65 throw new FacesException(e);
66 }
67 }
68
69 static String evalString(ValueExpression expr)
70 {
71 try {
72 return (String ) expr.getValue(currentELContext());
73 } catch (ELException e) {
74 throw new FacesException(e);
75 }
76 }
77
78 static String save(ValueExpression expr,
79 FacesContext context)
80 {
81 if (expr != null)
82 return expr.getExpressionString();
83 else
84 return null;
85 }
86
87 static ValueExpression restore(Object value,
88 Class type,
89 FacesContext context)
90 {
91 if (value == null)
92 return null;
93
94 String expr = (String ) value;
95
96 Application app = context.getApplication();
97 ExpressionFactory factory = app.getExpressionFactory();
98
99 return factory.createValueExpression(context.getELContext(),
100 expr,
101 type);
102 }
103
104 static ELContext currentELContext()
105 {
106 FacesContext facesContext = FacesContext.getCurrentInstance();
107
108 if (facesContext != null)
109 return facesContext.getELContext();
110 else
111 return null;
112 }
113 }
114 |
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