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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
* under the License.
*/
package org.apache.tuscany.sca.implementation.java.invocation;
import java.lang.annotation.ElementType;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.tuscany.sca.core.factory.ObjectFactory;
import org.apache.tuscany.sca.core.invocation.ProxyFactory;
import org.apache.tuscany.sca.implementation.java.JavaConstructorImpl;
import org.apache.tuscany.sca.implementation.java.JavaElementImpl;
import org.apache.tuscany.sca.implementation.java.JavaImplementation;
import org.apache.tuscany.sca.implementation.java.context.InstanceFactory;
import org.apache.tuscany.sca.implementation.java.context.InstanceFactoryProvider;
import org.apache.tuscany.sca.implementation.java.context.ReflectiveInstanceFactory;
import org.apache.tuscany.sca.implementation.java.injection.ArrayMultiplicityObjectFactory;
import org.apache.tuscany.sca.implementation.java.injection.FieldInjector;
import org.apache.tuscany.sca.implementation.java.injection.Injector;
import org.apache.tuscany.sca.implementation.java.injection.InvalidAccessorException;
import org.apache.tuscany.sca.implementation.java.injection.ListMultiplicityObjectFactory;
import org.apache.tuscany.sca.implementation.java.injection.MethodInjector;
import org.apache.tuscany.sca.implementation.java.introspect.JavaIntrospectionHelper;
/**
* Encapsulates configuration for a Java-based atomic component
*
* @version $Rev$ $Date$
*/
public class JavaInstanceFactoryProvider<T> implements InstanceFactoryProvider<T> {
private JavaImplementation definition;
private ProxyFactory proxyService;
private final List<JavaElementImpl> injectionSites;
private final EventInvoker<T> initInvoker;
private final EventInvoker<T> destroyInvoker;
private final Map<JavaElementImpl, Object> factories = new HashMap<JavaElementImpl, Object>();
private final List<JavaElementImpl> callbackInjectionSites;
public JavaInstanceFactoryProvider(JavaImplementation definition) {
this.definition = definition;
this.initInvoker = definition.getInitMethod() == null ? null : new MethodEventInvoker<T>(definition
.getInitMethod());
this.destroyInvoker = definition.getDestroyMethod() == null ? null : new MethodEventInvoker<T>(definition
.getDestroyMethod());
injectionSites = new ArrayList<JavaElementImpl>();
callbackInjectionSites = new ArrayList<JavaElementImpl>();
}
ProxyFactory getProxyFactory() {
return proxyService;
}
void setProxyFactory(ProxyFactory proxyService) {
this.proxyService = proxyService;
}
/**
* @return the definition
*/
JavaImplementation getImplementation() {
return definition;
}
@SuppressWarnings("unchecked")
public InstanceFactory<T> createFactory() {
ObjectFactory<?>[] initArgs = getConstructorArgs();
Injector<T>[] injectors = getInjectors(false);
Injector<T>[] callbackInjectors = getInjectors(true);
return new ReflectiveInstanceFactory<T>((Constructor<T>)definition.getConstructor().getConstructor(),
initArgs, injectors, callbackInjectors, initInvoker, destroyInvoker);
}
private ObjectFactory<?>[] getConstructorArgs() {
JavaConstructorImpl<?> constructor = definition.getConstructor();
ObjectFactory<?>[] initArgs = new ObjectFactory<?>[constructor.getParameters().length];
for (int i = 0; i < initArgs.length; i++) {
ObjectFactory<?> factory = (ObjectFactory<?>)factories.get(constructor.getParameters()[i]);
assert factory != null;
initArgs[i] = factory;
}
return initArgs;
}
@SuppressWarnings("unchecked")
private Injector<T>[] getInjectors(boolean callback) {
List<JavaElementImpl> sites = null;
if ( callback )
sites = callbackInjectionSites;
else
sites = injectionSites;
// work around JDK1.5 issue with allocating generic arrays
Injector<T>[] injectors = new Injector[sites.size()];
int i = 0;
for (JavaElementImpl element : sites) {
Object obj = factories.get(element);
if (obj != null) {
if (obj instanceof ObjectFactory) {
ObjectFactory<?> factory = (ObjectFactory<?>)obj;
Member member = (Member)element.getAnchor();
if (element.getElementType() == ElementType.FIELD) {
injectors[i++] = new FieldInjector<T>((Field)member, factory);
} else if (element.getElementType() == ElementType.PARAMETER && member instanceof Method) {
injectors[i++] = new MethodInjector<T>((Method)member, factory);
} else if (member instanceof Constructor) {
// Ignore
} else {
throw new AssertionError(String.valueOf(element));
}
} else {
injectors[i++] = createMultiplicityInjector(element, (List<ObjectFactory<?>>)obj);
}
}
}
return injectors;
}
private Injector<T> createMultiplicityInjector(JavaElementImpl element, List<ObjectFactory<?>> factories) {
Class<?> interfaceType = JavaIntrospectionHelper.getBaseType(element.getType(), element.getGenericType());
if (element.getAnchor() instanceof Field) {
Field field = (Field)element.getAnchor();
if (field.getType().isArray()) {
return new FieldInjector<T>(field, new ArrayMultiplicityObjectFactory(interfaceType, factories));
} else {
return new FieldInjector<T>(field, new ListMultiplicityObjectFactory(factories, field.getType()));
}
} else if (element.getAnchor() instanceof Method) {
Method method = (Method)element.getAnchor();
if (method.getParameterTypes()[0].isArray()) {
return new MethodInjector<T>(method, new ArrayMultiplicityObjectFactory(interfaceType, factories));
} else {
return new MethodInjector<T>(method, new ListMultiplicityObjectFactory(factories, method.getParameterTypes()[0]));
}
} else {
throw new InvalidAccessorException("Member must be a field or method: " + element.getName());
}
}
@SuppressWarnings("unchecked")
public Class<T> getImplementationClass() {
return (Class<T>)definition.getJavaClass();
}
public void setObjectFactory(JavaElementImpl element, ObjectFactory<?> objectFactory) {
factories.put(element, objectFactory);
}
public void setObjectFactories(JavaElementImpl element, List<ObjectFactory<?>> objectFactory) {
factories.put(element, objectFactory);
}
/**
* @return the injectionSites
*/
List<JavaElementImpl> getInjectionSites() {
return injectionSites;
}
/**
* @return the callbackInjectionSites
*/
public List<JavaElementImpl> getCallbackInjectionSites() {
return callbackInjectionSites;
}
/**
* @return the factories
*/
Map<JavaElementImpl, Object> getFactories() {
return factories;
}
}
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