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* 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
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****************************************************************/
package org.apache.cayenne.di.spi;
import org.apache.cayenne.di.DIRuntimeException;
import org.apache.cayenne.di.Provider;
import java.lang.reflect.Type;
/**
* @since 4.0
*/
public class ConstructorInjectingDecoratorProvider<T> implements DecoratorProvider<T> {
private Class<? extends T> implementation;
private DefaultInjector injector;
public ConstructorInjectingDecoratorProvider(Class<? extends T> implementation, DefaultInjector injector) {
this.implementation = implementation;
this.injector = injector;
}
@Override
public Provider<T> get(final Provider<T> undecorated) throws DIRuntimeException {
return new ConstructorInjectingProvider<T>(implementation, injector) {
@Override
protected Object value(Class<?> parameter, Type genericType, String bindingName, InjectionStack stack) {
// delegate (possibly) injected as Provider
if (Provider.class.equals(parameter)) {
Class<?> objectClass = DIUtil.parameterClass(genericType);
if (objectClass == null) {
throw new DIRuntimeException("Constructor provider parameter %s must be "
+ "parameterized to be usable for injection", parameter.getName());
}
if(objectClass.isAssignableFrom(implementation)) {
return undecorated;
}
}
// delegate injected as value
else if (parameter.isAssignableFrom(implementation)) {
return undecorated.get();
}
return super.value(parameter, genericType, bindingName, stack);
}
};
}
}