1 /*
2 * $Id$
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21 package org.apache.struts.validator.validwhen;
22
23 /**
24 * Holds the (interim) result during processing the parsing-tree.
25 * The result has is a {@code String}.
26 *
27 * @author Graff Stefan
28 *
29 * @since Struts 1.4.1
30 */
31 public class ValidWhenResultString extends ValidWhenResult<String> {
32
33 /**
34 * Constructs this class with the type {@code String}.
35 *
36 * @param value the current value of
37 * the result
38 */
39 public ValidWhenResultString(String value) {
40 super(String.class, initValue(value));
41 }
42
43 /**
44 * Trims the {@code value} and returns {@code null}
45 * if the {@code value} is empty.
46 *
47 * @param value the value
48 *
49 * @return the trimmed {@code String} or {@code null}
50 */
51 private static String initValue(String value) {
52 if (value == null) {
53 return null;
54 }
55
56 String s = value.trim();
57 return s.isEmpty() ? null : s;
58 }
59 }