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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.contribution.resolver;
import java.lang.reflect.Constructor;
import java.util.HashMap;
import java.util.Map;
import org.apache.tuscany.sca.contribution.Contribution;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
/**
* An implementation of an extensible model resolver which delegates to the
* proper resolver extension based on the class of the model to resolve.
*
* @version $Rev: 632499 $ $Date: 2008-02-29 15:59:39 -0800 (Fri, 29 Feb 2008) $
*/
public class ExtensibleModelResolver implements ModelResolver {
private final ModelResolverExtensionPoint resolvers;
private final ModelFactoryExtensionPoint factories;
private final Contribution contribution;
private final ModelResolver defaultResolver;
private final Map<Class<?>, ModelResolver> resolverInstances = new HashMap<Class<?>, ModelResolver>();
private Map<Object, Object> map = new HashMap<Object, Object>();
/**
* Constructs an extensible model resolver
*
* @param resolvers
* @param contribution
* @param factories
*/
@Deprecated
public ExtensibleModelResolver(Contribution contribution,
ModelResolverExtensionPoint resolvers,
ModelFactoryExtensionPoint factories,
ModelResolver defaultResolver) {
this.contribution = contribution;
this.resolvers = resolvers;
this.factories = factories;
//FIXME Remove this default resolver, this is currently used to resolve policy declarations
// but they should be handled by the contribution import/export mechanism instead of this
// defaultResolver hack.
this.defaultResolver = defaultResolver;
}
/**
* Constructs an extensible model resolver
*
* @param resolvers
* @param contribution
* @param factories
*/
public ExtensibleModelResolver(Contribution contribution,
ModelResolverExtensionPoint resolvers,
ModelFactoryExtensionPoint factories) {
this.contribution = contribution;
this.resolvers = resolvers;
this.factories = factories;
this.defaultResolver = null;
}
/**
* Returns the proper resolver instance based on the interfaces of the model
* If one is not available on the registry, instantiate on demand
*
* @param modelType
* @return
*/
private ModelResolver getModelResolverInstance(Class<?> modelType) {
// Look up a model resolver instance for the model class or
// each implemented interface
Class<?>[] interfaces = modelType.getInterfaces();
Class<?>[] classes = new Class<?>[interfaces.length + 1];
classes[0] = modelType;
if (interfaces.length != 0) {
System.arraycopy(interfaces, 0, classes, 1, interfaces.length);
}
for (Class<?> c : classes) {
// Look up an existing model resolver instance
ModelResolver resolverInstance = resolverInstances.get(c);
if (resolverInstance != null) {
return resolverInstance;
}
// We don't have an instance, lookup a model resolver class
// and instantiate it
Class<? extends ModelResolver> resolverClass = resolvers.getResolver(c);
if (resolverClass != null) {
try {
Constructor<? extends ModelResolver> constructor =
resolverClass
.getConstructor(new Class[] {Contribution.class, ModelFactoryExtensionPoint.class});
if (constructor != null) {
// Construct the model resolver instance and cache it
resolverInstance = constructor.newInstance(contribution, factories);
resolverInstances.put(c, resolverInstance);
return resolverInstance;
}
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
}
return null;
}
public void addModel(Object resolved) {
ModelResolver resolver = getModelResolverInstance(resolved.getClass());
if (resolver != null) {
resolver.addModel(resolved);
} else {
map.put(resolved, resolved);
}
}
public Object removeModel(Object resolved) {
ModelResolver resolver = getModelResolverInstance(resolved.getClass());
if (resolver != null) {
return resolver.removeModel(resolved);
} else {
return map.remove(resolved);
}
}
public <T> T resolveModel(Class<T> modelClass, T unresolved) {
ModelResolver resolver = getModelResolverInstance(unresolved.getClass());
if (resolver != null) {
return resolver.resolveModel(modelClass, unresolved);
} else {
//FIXME Remove this default resolver, this is currently used to resolve policy declarations
// but they should be handled by the contribution import/export mechanism instead of this
// defaultResolver hack.
if (defaultResolver != null) {
Object resolved = defaultResolver.resolveModel(modelClass, unresolved);
if (resolved != null && resolved != unresolved) {
return modelClass.cast(resolved);
}
}
Object resolved = map.get(unresolved);
if (resolved != null) {
// Return the resolved object
return modelClass.cast(resolved);
}
}
return unresolved;
}
}
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