/*****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
****************************************************************/
package org.apache.cayenne.access.types;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.cayenne.di.Inject;
/**
* Default implementation of {@link ValueObjectTypeRegistry}
* @since 4.0
*/
public class DefaultValueObjectTypeRegistry implements ValueObjectTypeRegistry {
final Map<String, ValueObjectType<?,?>> typeCache;
public DefaultValueObjectTypeRegistry(@Inject List<ValueObjectType<?, ?>> valueObjectTypeList) {
typeCache = new ConcurrentHashMap<>();
buildTypeCache(valueObjectTypeList);
}
private void buildTypeCache(List<ValueObjectType<?, ?>> valueObjectTypeList) {
for(ValueObjectType<?, ?> valueObjectType : valueObjectTypeList) {
typeCache.put(valueObjectType.getValueType().getName(), valueObjectType);
}
}
/**
* @inheritDoc
*/
@SuppressWarnings("unchecked")
@Override
public <T> ValueObjectType<T, ?> getValueType(Class<? extends T> valueClass) {
ValueObjectType type = typeCache.get(valueClass.getName());
if(type == null) {
type = findBySuperclasses(valueClass);
} else if(type == NULL_DUMMY) {
return null;
}
return type;
}
protected ValueObjectType<?, ?> findBySuperclasses(final Class<?> baseClass) {
ValueObjectType<?,?> type = null;
Class<?> searchClass = baseClass.getSuperclass();
while(searchClass != null && !searchClass.equals(Object.class)) {
type = typeCache.get(searchClass.getName());
if(type != null) {
// cache it for faster search later
typeCache.put(baseClass.getName(), type);
break;
}
searchClass = searchClass.getSuperclass();
}
// as well cache null result
if(type == null) {
typeCache.put(baseClass.getName(), NULL_DUMMY);
}
return type;
}
private static final ValueObjectType<?, ?> NULL_DUMMY = new ValueObjectType() {
@Override
public Class<?> getTargetType() {
return null;
}
@Override
public Class<?> getValueType() {
return null;
}
@Override
public Object toJavaObject(Object value) {
return null;
}
@Override
public Object fromJavaObject(Object object) {
return null;
}
@Override
public String toCacheKey(Object object) {
return null;
}
};
}