01: /*
02: * Copyright 2004, 2005, 2006 Odysseus Software GmbH
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16: package de.odysseus.calyxo.forms.convert;
17:
18: /**
19: * String converter.
20: *
21: * @author Christoph Beck
22: * @author Oliver Stuhr
23: */
24: public class StringConverter extends SimpleConverter {
25: private String formattedNull = "";
26: private String parsedNullOrEmpty = null;
27:
28: /**
29: * Format method.
30: */
31: public String format(Object value) {
32: return value == null ? formattedNull : (String) value;
33: }
34:
35: /**
36: * Parse method.
37: */
38: public Object parse(String value) {
39: if (value == null || value.length() == 0)
40: return parsedNullOrEmpty;
41: else if (value.equals(formattedNull))
42: return null;
43: return value;
44: }
45:
46: public String getDefault() {
47: return parsedNullOrEmpty;
48: }
49:
50: public void setDefault(String value) {
51: parsedNullOrEmpty = value;
52: }
53:
54: /**
55: * @return value to be used to format <code>null</code>
56: */
57: public String getFormattedNull() {
58: return formattedNull;
59: }
60:
61: /**
62: * @param string
63: */
64: public void setFormattedNull(String string) {
65: formattedNull = string;
66: }
67:
68: /**
69: * This converter is thread-save, so answer <code>true</code>
70: */
71: public boolean isSharable() {
72: return true;
73: }
74: }
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