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1   /*
2    * Copyright 2004-2010 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  
17  package org.seasar.cubby.spi.impl;
18  
19  import java.util.HashMap;
20  import java.util.Map;
21  
22  import org.seasar.cubby.converter.Converter;
23  
24  /**
25   * コンバータのキャッシュを備えたコンバータプロバイダのスケルトン実装です。
26   * 
27   * @author baba
28   */
29  public abstract class AbstractCachedConverterProvider extends
30  		AbstractConverterProvider {
31  
32  	/** コンバータのキャッシュです。 */
33  	private final Map<String, Converter> converterCache = new HashMap<String, Converter>();
34  
35  	/**
36  	 * {@inheritDoc}
37  	 */
38  	@Override
39  	public Converter getConverter(final Class<?> parameterType,
40  			final Class<?> objectType) {
41  		final Class<?> destType = ConversionUtils
42  				.getWrapperClassIfPrimitive(objectType);
43  		final String cacheKey = cacheKey(parameterType, destType);
44  		final Converter converter = converterCache.get(cacheKey);
45  		if (converter != null) {
46  			return converter;
47  		}
48  		return detectConverter(parameterType, destType);
49  	}
50  
51  	private Converter detectConverter(final Class<?> parameterType,
52  			final Class<?> objectType) {
53  		final Converter converter = super.getConverter(parameterType,
54  				objectType);
55  		final String cacheKey = cacheKey(parameterType, objectType);
56  		converterCache.put(cacheKey, converter);
57  		return converter;
58  	}
59  
60  	private static String cacheKey(final Class<?> parameterType,
61  			final Class<?> objectType) {
62  		if (parameterType == null) {
63  			return objectType.getName();
64  		}
65  		return parameterType.getName() + objectType.getName();
66  	}
67  
68  	/**
69  	 * キャッシュをクリアします。
70  	 */
71  	protected void clear() {
72  		this.converterCache.clear();
73  	}
74  
75  }