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 StringTranslator implements Translator<String> {
23: /** Returns the client value (or null, if the client value is blank). */
24: public String parseClient(String clientValue, Messages messages)
25: throws ValidationException {
26: return InternalUtils.isBlank(clientValue) ? null : clientValue;
27: }
28:
29: /** Returns the value, or the empty string if value is null. */
30: public String toClient(String value) {
31: return value == null ? "" : value;
32: }
33:
34: }
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