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: public class DoubleTranslator implements Translator<Double> {
23: /**
24: * Parses blank values to null, otherwise parses the client value to a double
25: *
26: * @throws ValidationException
27: * if the clientValue can not be parsed
28: */
29: public Double parseClient(String clientValue, Messages messages)
30: throws ValidationException {
31: if (InternalUtils.isBlank(clientValue))
32: return null;
33:
34: try {
35: return new Double(clientValue.trim());
36: } catch (NumberFormatException ex) {
37: throw new ValidationException(messages.format(
38: "number-format-exception", clientValue));
39: }
40: }
41:
42: /**
43: * Converts null to the blank string, non-null to a string representation.
44: */
45: public String toClient(Double value) {
46: return value == null ? "" : value.toString();
47: }
48: }
|