/*
* 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.osgi.impl;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import org.apache.tuscany.sca.contribution.Contribution;
import org.apache.tuscany.sca.contribution.Import;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.contribution.resolver.ResourceReference;
import org.apache.tuscany.sca.osgi.runtime.OSGiRuntime;
import org.osgi.framework.Bundle;
/**
* A Model Resolver for ResourceReferences from OSGi bundles.
*
*/
public class OSGiResourceReferenceModelResolver implements ModelResolver {
private Contribution contribution;
private Map<String, ResourceReference> map = new HashMap<String, ResourceReference>();
private Bundle bundle;
private boolean initialized;
public OSGiResourceReferenceModelResolver(Contribution contribution, ModelFactoryExtensionPoint modelFactories) {
this.contribution = contribution;
}
public void addModel(Object resolved) {
ResourceReference resourceRef = (ResourceReference)resolved;
map.put(resourceRef.getResourceName(), resourceRef);
}
public Object removeModel(Object resolved) {
return map.remove(((ResourceReference)resolved).getResourceName());
}
/**
* Handle artifact resolution when the specific class reference is imported from another contribution
* @param unresolved
* @return
*/
private ResourceReference resolveImportedModel(ResourceReference unresolved) {
ResourceReference resolved = unresolved;
if (this.contribution != null) {
for (Import import_ : this.contribution.getImports()) {
if (resolved == unresolved && bundle != null) {
resolved = import_.getModelResolver().resolveModel(ResourceReference.class, unresolved);
if (resolved != unresolved)
break;
}
}
}
return resolved;
}
public <T> T resolveModel(Class<T> modelClass, T unresolved) {
Object resolved = map.get(unresolved);
if (resolved != null) {
return modelClass.cast(resolved);
}
initialize();
// Get a resource
String resourceName = ((ResourceReference)unresolved).getResourceName();
URL resourceURL = null;
if (bundle != null) {
try {
resourceURL = bundle.getResource(resourceName);
} catch (Exception e) {
// we will later try to delegate to imported model resolvers
}
}
if (resourceURL != null) {
// Store a new ResourceReference wrappering the resource
ResourceReference resourceReference = new ResourceReference(resourceName, resourceURL);
map.put(resourceName, resourceReference);
// Return the resolved ClassReference
return modelClass.cast(resourceReference);
} else {
//delegate resolution of the class
resolved = this.resolveImportedModel((ResourceReference)unresolved);
return modelClass.cast(resolved);
}
}
private void initialize() {
if (initialized)
return;
initialized = true;
try {
bundle = OSGiRuntime.findInstalledBundle(contribution.getLocation());
} catch (Exception e) {
}
}
}