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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.converter.impl;
17  
18  import java.text.DateFormat;
19  import java.text.ParseException;
20  import java.util.Date;
21  
22  import org.seasar.cubby.converter.ConversionHelper;
23  
24  /**
25   * 任意のオブジェクトから{@link Date}への変換を行うコンバータです。
26   * <p>
27   * 変換元のオブジェクトの文字列表現をフォーマットに従って{@link Date}に変換した結果を変換先とします。
28   * </p>
29   * 
30   * @author baba
31   * @since 1.1.0
32   */
33  public class DateConverter extends AbstractConverter {
34  
35  	/**
36  	 * {@inheritDoc}
37  	 */
38  	public Class<?> getObjectType() {
39  		return Date.class;
40  	}
41  
42  	/**
43  	 * {@inheritDoc}
44  	 */
45  	public Object convertToObject(final Object value,
46  			final Class<?> objectType, ConversionHelper helper) {
47  		if (value == null) {
48  			return null;
49  		}
50  		final DateFormat dateFormat = helper.getFormatPattern().getDateFormat();
51  		return toDate(value.toString(), dateFormat);
52  	}
53  
54  	/**
55  	 * 文字列を{@link Date}に変換して返します。
56  	 * 
57  	 * @param date
58  	 *            変換元のオブジェクトの文字列表現
59  	 * @param dateFormat
60  	 *            フォーマット
61  	 * @return 変換した結果の{@link Date}
62  	 */
63  	protected Date toDate(final String date, final DateFormat dateFormat) {
64  		if (date == null || date.length() == 0) {
65  			return null;
66  		}
67  		try {
68  			return dateFormat.parse(date);
69  		} catch (final ParseException e) {
70  			return null;
71  		}
72  	}
73  
74  	/**
75  	 * {@inheritDoc}
76  	 */
77  	public String convertToString(final Object value, ConversionHelper helper) {
78  		if (value == null) {
79  			return null;
80  		}
81  		final DateFormat formatter = helper.getFormatPattern().getDateFormat();
82  		return formatter.format((Date) value);
83  	}
84  
85  }