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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 org.seasar.cubby.validator.MessageHelper;
19  import org.seasar.cubby.validator.ScalarFieldValidator;
20  import org.seasar.cubby.validator.ValidationContext;
21  import org.seasar.framework.util.StringUtil;
22  
23  /**
24   * 必須検証します。
25   * <p>
26   * 文字列の長さが0の場合、検証エラーとなります。
27   * </p>
28   * <p>
29   * デフォルトエラーメッセージキー:valid.required
30   * </p>
31   * 
32   * @author agata
33   * @author baba
34   */
35  public class RequiredValidator implements ScalarFieldValidator {
36  
37  	/**
38  	 * メッセージヘルパ。
39  	 */
40  	private final MessageHelper messageHelper;
41  
42  	/**
43  	 * コンストラクタ
44  	 */
45  	public RequiredValidator() {
46  		this("valid.required");
47  	}
48  
49  	/**
50  	 * エラーメッセージキーを指定するコンストラクタ
51  	 * 
52  	 * @param messageKey
53  	 *            エラーメッセージキー
54  	 */
55  	public RequiredValidator(final String messageKey) {
56  		this.messageHelper = new MessageHelper(messageKey);
57  	}
58  
59  	public void validate(final ValidationContext context, final Object value) {
60  		if (value instanceof String) {
61  			final String str = (String) value;
62  			if (!StringUtil.isEmpty(str)) {
63  				return;
64  			}
65  		} else if (value != null) {
66  			return;
67  		}
68  		context.addMessageInfo(this.messageHelper.createMessageInfo());
69  	}
70  
71  }