View Javadoc

1   /*
2    * Copyright 2004-2008 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.math.BigDecimal;
19  
20  import org.seasar.cubby.validator.MessageHelper;
21  import org.seasar.cubby.validator.ScalarFieldValidator;
22  import org.seasar.cubby.validator.ValidationContext;
23  import org.seasar.framework.util.StringUtil;
24  
25  /**
26   * 数値かどうかを検証します。
27   * <p>
28   * 数値かどうかの検証は {@link BigDecimal#BigDecimal(String)} で行っています。
29   * <p>
30   * デフォルトエラーメッセージキー:valid.number
31   * </p>
32   * 
33   * @author agata
34   * @author baba
35   * @see BigDecimal#BigDecimal(String)
36   */
37  public class NumberValidator implements ScalarFieldValidator {
38  
39  	/**
40  	 * メッセージヘルパ。
41  	 */
42  	private final MessageHelper messageHelper;
43  
44  	/**
45  	 * コンストラクタ
46  	 */
47  	public NumberValidator() {
48  		this("valid.number");
49  	}
50  
51  	/**
52  	 * エラーメッセージキーを指定するコンストラクタ
53  	 * 
54  	 * @param messageKey
55  	 *            エラーメッセージキー
56  	 */
57  	public NumberValidator(final String messageKey) {
58  		this.messageHelper = new MessageHelper(messageKey);
59  	}
60  
61  	public void validate(final ValidationContext context, final Object value) {
62  		if (value instanceof String) {
63  			final String str = (String) value;
64  			if (StringUtil.isEmpty(str)) {
65  				return;
66  			}
67  			try {
68  				new BigDecimal(str);
69  				return;
70  			} catch (final NumberFormatException e) {
71  			}
72  		} else if (value == null) {
73  			return;
74  		}
75  		context.addMessageInfo(this.messageHelper.createMessageInfo());
76  	}
77  
78  }