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