View Javadoc

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.math.BigDecimal;
19  import java.util.regex.Pattern;
20  
21  import org.seasar.cubby.internal.util.StringUtils;
22  import org.seasar.cubby.validator.MessageHelper;
23  import org.seasar.cubby.validator.ScalarFieldValidator;
24  import org.seasar.cubby.validator.ValidationContext;
25  
26  /**
27   * 数値かどうかを検証します。
28   * <p>
29   * 数値かどうかの検証は {@link BigDecimal#BigDecimal(String)} で行っています。
30   * <p>
31   * デフォルトエラーメッセージキー:valid.number
32   * </p>
33   * 
34   * @author agata
35   * @author baba
36   * @see BigDecimal#BigDecimal(String)
37   * @since 1.0.0
38   */
39  public class NumberValidator implements ScalarFieldValidator {
40  
41  	private static final Pattern NUMBER_PATTERN = Pattern.compile("^[-+]?[0-9]+[.]?[0-9]*$");
42  	
43  	/**
44  	 * メッセージヘルパ。
45  	 */
46  	private final MessageHelper messageHelper;
47  
48  	/**
49  	 * コンストラクタ
50  	 */
51  	public NumberValidator() {
52  		this("valid.number");
53  	}
54  
55  	/**
56  	 * エラーメッセージキーを指定するコンストラクタ
57  	 * 
58  	 * @param messageKey
59  	 *            エラーメッセージキー
60  	 */
61  	public NumberValidator(final String messageKey) {
62  		this.messageHelper = new MessageHelper(messageKey);
63  	}
64  
65  	/**
66  	 * {@inheritDoc}
67  	 */
68  	public void validate(final ValidationContext context, final Object value) {
69  		if (value instanceof String) {
70  			final String str = (String) value;
71  			if (StringUtils.isEmpty(str)) {
72  				return;
73  			}
74  			if (NUMBER_PATTERN.matcher(str).find()) {
75  				return;
76  			}
77  		} else if (value == null) {
78  			return;
79  		}
80  		context.addMessageInfo(this.messageHelper.createMessageInfo());
81  	}
82  
83  }