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package org.seasar.cubby.converter.impl; |
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import java.util.HashMap; |
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import java.util.Map; |
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import java.util.TreeMap; |
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import org.seasar.cubby.converter.Converter; |
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import org.seasar.cubby.converter.ConverterFactory; |
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import org.seasar.framework.container.S2Container; |
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import org.seasar.framework.util.ClassUtil; |
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import org.seasar.framework.util.Disposable; |
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import org.seasar.framework.util.DisposableUtil; |
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public class ConverterFactoryImpl implements ConverterFactory, Disposable { |
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protected boolean initialized; |
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protected S2Container container; |
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protected Converter[] converters; |
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47 | 73 | protected Map<String, Converter> converterCache = new HashMap<String, Converter>(); |
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53 | 73 | public ConverterFactoryImpl() { |
54 | 73 | } |
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public void setContainer(final S2Container container) { |
63 | 73 | this.container = container.getRoot(); |
64 | 73 | } |
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public void initialize() { |
70 | 134 | if (initialized) { |
71 | 118 | return; |
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} |
73 | 16 | converters = (Converter[]) container.findAllComponents(Converter.class); |
74 | 16 | DisposableUtil.add(this); |
75 | 16 | initialized = true; |
76 | 16 | } |
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public void dispose() { |
83 | 16 | converters = null; |
84 | 16 | converterCache.clear(); |
85 | 16 | initialized = false; |
86 | 16 | } |
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public Converter getConverter(final Class<?> parameterType, |
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final Class<?> objectType) { |
93 | 134 | initialize(); |
94 | 134 | final Class<?> destType = ClassUtil |
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.getWrapperClassIfPrimitive(objectType); |
96 | 134 | final String cacheKey = cacheKey(parameterType, destType); |
97 | 134 | final Converter converter = converterCache.get(cacheKey); |
98 | 134 | if (converter != null) { |
99 | 66 | return converter; |
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} |
101 | 68 | return detectConverter(parameterType, destType); |
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} |
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private Converter detectConverter(final Class<?> parameterType, |
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final Class<?> objectType) { |
106 | 68 | final Converter converter = getDistanceTable(parameterType, objectType); |
107 | 68 | final String cacheKey = cacheKey(parameterType, objectType); |
108 | 68 | converterCache.put(cacheKey, converter); |
109 | 68 | return converter; |
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} |
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private static String cacheKey(final Class<?> parameterType, |
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final Class<?> objectType) { |
114 | 202 | if (parameterType == null) { |
115 | 15 | return objectType.getName(); |
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} |
117 | 187 | return parameterType.getName() + objectType.getName(); |
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} |
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private Converter getDistanceTable(final Class<?> parameterType, |
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final Class<?> objectType) { |
122 | 68 | final Map<Integer, Converter> distanceTable = new TreeMap<Integer, Converter>(); |
123 | 1224 | for (final Converter converter : converters) { |
124 | 1156 | if (!converter.canConvert(parameterType, objectType)) { |
125 | 1130 | continue; |
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} |
127 | 26 | final int distance = getDistance(converter.getObjectType(), |
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objectType); |
129 | 26 | distanceTable.put(distance, converter); |
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} |
131 | 68 | if (distanceTable.isEmpty()) { |
132 | 45 | return null; |
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} |
134 | 23 | return distanceTable.values().iterator().next(); |
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} |
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private int getDistance(final Class<?> assigner, final Class<?> assignee) { |
138 | 26 | return getDistance(assigner, assignee, 0); |
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} |
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private int getDistance(final Class<?> assigner, final Class<?> assignee, |
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final int distance) { |
143 | 29 | if (assignee.equals(assigner)) { |
144 | 22 | return distance; |
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} |
146 | 7 | if (Enum.class.equals(assigner) && assignee.isEnum()) { |
147 | 1 | return distance + 5; |
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} |
149 | 6 | if (isImplements(assigner, assignee)) { |
150 | 0 | return distance + 5; |
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} |
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153 | 6 | final Class<?> superClass = assigner.getSuperclass(); |
154 | 6 | if (superClass == null) { |
155 | 3 | return distance + 10; |
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} |
157 | 3 | return getDistance(superClass, assignee, distance + 10); |
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} |
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private boolean isImplements(final Class<?> assigner, |
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final Class<?> assignee) { |
162 | 6 | return !assigner.isInterface() && assignee.isInterface() |
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&& assignee.isAssignableFrom(assigner); |
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} |
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} |