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: /** A translator for type long. */
23: public class LongTranslator implements Translator<Long> {
24: /**
25: * Parses blank values to null, otherwise parses the client value to a long
26: *
27: * @throws ValidationException
28: * if the clientValue can not be parsed
29: */
30: public Long parseClient(String clientValue, Messages messages)
31: throws ValidationException {
32: if (InternalUtils.isBlank(clientValue))
33: return null;
34:
35: try {
36: return new Long(clientValue.trim());
37: } catch (NumberFormatException ex) {
38: throw new ValidationException(messages.format(
39: "integer-format-exception", clientValue));
40: }
41: }
42:
43: /**
44: * Converts null to the blank string, non-null to a string representation.
45: */
46: public String toClient(Long value) {
47: return value == null ? "" : value.toString();
48: }
49: }
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