01: // Copyright 2007 The Apache Software Foundation
02: //
03: // Licensed under the Apache License, Version 2.0 (the "License");
04: // you may not use this file except in compliance with the License.
05: // You may obtain a copy of the License at
06: //
07: // http://www.apache.org/licenses/LICENSE-2.0
08: //
09: // Unless required by applicable law or agreed to in writing, software
10: // distributed under the License is distributed on an "AS IS" BASIS,
11: // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12: // See the License for the specific language governing permissions and
13: // limitations under the License.
14:
15: package org.apache.tapestry.translator;
16:
17: import org.apache.tapestry.Translator;
18: import org.apache.tapestry.ValidationException;
19: import org.apache.tapestry.ioc.Messages;
20: import org.apache.tapestry.ioc.internal.util.InternalUtils;
21:
22: /**
23: * A translator for type integer.
24: */
25: public final class IntegerTranslator implements Translator<Integer> {
26: /**
27: * Parses blank values to null, otherwise parses the client value to an integer.
28: *
29: * @throws ValidationException
30: * if the clientValue can not be parsed as an integer
31: */
32: public Integer parseClient(String clientValue, Messages messages)
33: throws ValidationException {
34: if (InternalUtils.isBlank(clientValue))
35: return null;
36:
37: try {
38: return new Integer(clientValue.trim());
39: } catch (NumberFormatException ex) {
40: throw new ValidationException(messages.format(
41: "integer-format-exception", clientValue));
42: }
43: }
44:
45: /**
46: * Converts null to the blank string, non-null to a string representation.
47: */
48: public String toClient(Integer value) {
49: return value == null ? "" : value.toString();
50: }
51:
52: }
|