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.converter.impl;
17  
18  import org.seasar.cubby.converter.ConversionHelper;
19  
20  /**
21   * {@link Boolean}への変換を行うコンバータです。
22   * <p>
23   * 変換元オブジェクトの文字列表現が<code>yes</code>、<code>y</code>、<code>true</code>、
24   * <code>on</code>、<code>1</code>なら<code>true</code>、 そうでなければ<code>false</code>
25   * とします。
26   * </p>
27   * 
28   * @author baba
29   */
30  public class BooleanConverter extends AbstractConverter {
31  
32  	/** <code>true</code>に評価する文字列の配列です。 */
33  	private static final String[] TRUE_STRINGS = new String[] { "yes", "y",
34  			"true", "on", "1", };
35  
36  	/**
37  	 * {@inheritDoc}
38  	 */
39  	public Class<?> getObjectType() {
40  		return Boolean.class;
41  	}
42  
43  	/**
44  	 * {@inheritDoc}
45  	 */
46  	public Object convertToObject(final Object value,
47  			final Class<?> objectType, final ConversionHelper helper) {
48  		if (value == null) {
49  			return null;
50  		}
51  		return toBoolean(value.toString());
52  	}
53  
54  	/**
55  	 * 文字列を{@link Boolean}に変換して返します。
56  	 * 
57  	 * @param value
58  	 *            変換元の文字列表現
59  	 * @return 変換した結果の{@link Boolean}
60  	 */
61  	protected Object toBoolean(final String value) {
62  		for (final String trueString : TRUE_STRINGS) {
63  			if (trueString.equalsIgnoreCase(value)) {
64  				return Boolean.TRUE;
65  			}
66  		}
67  		return Boolean.FALSE;
68  	}
69  
70  	/**
71  	 * {@inheritDoc}
72  	 */
73  	public String convertToString(final Object value,
74  			final ConversionHelper helper) {
75  		if (value == null) {
76  			return null;
77  		}
78  		return value.toString();
79  	}
80  
81  }