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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.apache.commons.fileupload.FileItem;
19  import org.seasar.cubby.converter.ConversionHelper;
20  
21  /**
22   * {@link FileItem}を他の型のオブジェクトに変換するクラスの抽象クラスです。
23   * 
24   * @author baba
25   */
26  public abstract class AbstractFileItemConverter extends AbstractConverter {
27  
28  	/**
29  	 * {@inheritDoc}
30  	 */
31  	@Override
32  	public boolean canConvert(final Class<?> parameterType,
33  			final Class<?> objectType) {
34  		if (parameterType == null) {
35  			return false;
36  		}
37  		if (!FileItem.class.isAssignableFrom(parameterType)) {
38  			return false;
39  		}
40  		return super.canConvert(parameterType, objectType);
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  		final FileItem fileItem = (FileItem) value;
52  		return convert(fileItem);
53  	}
54  
55  	/**
56  	 * {@inheritDoc}
57  	 */
58  	public String convertToString(final Object value,
59  			final ConversionHelper helper) {
60  		return null;
61  	}
62  
63  	/**
64  	 * {@link FileItem} を特定の型に変換します。
65  	 * 
66  	 * @param fileItem
67  	 *            変換元のインスタンス
68  	 * @return <code>fileItem</code>を変換したインスタンス
69  	 */
70  	protected abstract Object convert(final FileItem fileItem);
71  
72  }