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1   /*
2    * Copyright 2004-2009 the Seasar Foundation and the Others.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13   * either express or implied. See the License for the specific language
14   * governing permissions and limitations under the License.
15   */
16  package org.seasar.cubby.validator.validators;
17  
18  import java.util.regex.Pattern;
19  
20  import org.seasar.cubby.action.MessageInfo;
21  import org.seasar.cubby.internal.util.StringUtils;
22  import org.seasar.cubby.validator.ScalarFieldValidator;
23  import org.seasar.cubby.validator.ValidationContext;
24  
25  /**
26   * 数値であるかを検証します。
27   * <p>
28   * <table>
29   * <caption>検証エラー時に設定するエラーメッセージ</caption> <tbody>
30   * <tr>
31   * <th scope="row">デフォルトのキー</th>
32   * <td>valid.number</td>
33   * </tr>
34   * <tr>
35   * <th scope="row">置換文字列</th>
36   * <td>
37   * <ol start="0">
38   * <li>フィールド名</li>
39   * </ol></td>
40   * </tr>
41   * </tbody>
42   * </table>
43   * </p>
44   * 
45   * @author agata
46   * @author baba
47   */
48  public class NumberValidator implements ScalarFieldValidator {
49  
50  	private static final Pattern NUMBER_PATTERN = Pattern
51  			.compile("^[-+]?[0-9]+[.]?[0-9]*$");
52  
53  	/**
54  	 * メッセージキー。
55  	 */
56  	private final String messageKey;
57  
58  	/**
59  	 * コンストラクタ
60  	 */
61  	public NumberValidator() {
62  		this("valid.number");
63  	}
64  
65  	/**
66  	 * エラーメッセージキーを指定するコンストラクタ
67  	 * 
68  	 * @param messageKey
69  	 *            エラーメッセージキー
70  	 */
71  	public NumberValidator(final String messageKey) {
72  		this.messageKey = messageKey;
73  	}
74  
75  	/**
76  	 * {@inheritDoc}
77  	 */
78  	public void validate(final ValidationContext context, final Object value) {
79  		if (value instanceof String) {
80  			final String str = (String) value;
81  			if (StringUtils.isEmpty(str)) {
82  				return;
83  			}
84  			if (NUMBER_PATTERN.matcher(str).find()) {
85  				return;
86  			}
87  		} else if (value == null) {
88  			return;
89  		}
90  
91  		final MessageInfo messageInfo = new MessageInfo();
92  		messageInfo.setKey(this.messageKey);
93  		context.addMessageInfo(messageInfo);
94  	}
95  
96  }