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1
56 package org.objectstyle.cayenne.modeler.util;
57
58 import org.objectstyle.cayenne.exp.Expression;
59 import org.objectstyle.cayenne.exp.ExpressionException;
60 import org.objectstyle.cayenne.exp.parser.ParseException;
61 import org.objectstyle.cayenne.util.Util;
62 import org.scopemvc.util.convertor.StringConvertor;
63
64
70 public class ExpressionConvertor implements StringConvertor {
71
72 public String  valueAsString(Object value) throws IllegalArgumentException {
73 if (value == null) {
74 return null;
75 }
76
77 if (!(value instanceof Expression)) {
78 throw new IllegalArgumentException (
79 "Unsupported value class: " + value.getClass().getName());
80 }
81
82 return value.toString();
83 }
84
85 public Object stringAsValue(String string) throws IllegalArgumentException {
86 if (string == null || string.trim().length() == 0) {
87 return null;
88 }
89
90 try {
91 return Expression.fromString(string);
92 }
93 catch (ExpressionException eex) {
94 Throwable cause = Util.unwindException(eex);
96 String message =
97 (cause instanceof ParseException)
98 ? cause.getMessage()
99 : "Invalid expression: " + string;
100
101 throw new IllegalArgumentException (message);
102 }
103 }
104
105 public boolean supportsStringAsValue() {
106 return true;
107 }
108 }
109 |
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