|
1 package org.objectstyle.cayenne.swing;
2
3 import java.util.Map  ;
4
5 import ognl.Ognl;
6 import ognl.OgnlException;
7
8 import org.objectstyle.cayenne.CayenneRuntimeException;
9 import org.objectstyle.cayenne.util.Util;
10
11
16 public class BindingExpression {
17
18 private Object compiled;
19 protected String expression;
20
21 static Throwable unwind(Throwable th) {
22 if (th instanceof OgnlException) {
23 Throwable reason = ((OgnlException) th).getReason();
24 return (reason != null) ? unwind(reason) : th;
25 }
26 else {
27 return Util.unwindException(th);
28 }
29 }
30
31 public BindingExpression(String expression) {
32 try {
33 this.compiled = Ognl.parseExpression(expression);
34 }
35 catch (OgnlException ex) {
36 throw new CayenneRuntimeException(
37 "Invalid expression - " + expression,
38 BindingBase.unwind(ex));
39 }
40
41 this.expression = expression;
42 }
43
44 public String getExpression() {
45 return expression;
46 }
47
48 public void setValue(Object context, Map contextVariables, Object value) {
49 if (context == null) {
50 throw new BindingException("No context");
51 }
52
53 try {
54 Ognl.setValue(compiled, contextVariables, context, value);
55 }
56 catch (OgnlException ex) {
57 throw new BindingException(
58 "Evaluation failed in context: " + context,
59 unwind(ex));
60 }
61 }
62
63 public Object getValue(Object context, Map contextVariables) {
64 if (context == null) {
65 throw new BindingException("No context");
66 }
67
68 try {
69 return Ognl.getValue(compiled, contextVariables, context);
70 }
71 catch (OgnlException ex) {
72 throw new BindingException(
73 "Evaluation failed in context: " + context,
74 unwind(ex));
75 }
76 }
77 } |
Popular Tags |
Java API By Example, From Geeks To Geeks.