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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.osgi.impl;
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.osgi.BundleReference;
import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.core.FactoryExtensionPoint;
import org.osgi.framework.Bundle;
/**
* A Model Resolver for BundleReferences.
*
* @version $Rev$ $Date$
*/
public class OSGiBundleReferenceModelResolver implements ModelResolver {
private Contribution contribution;
private Map<BundleReference, BundleReference> refs = new HashMap<BundleReference, BundleReference>();
private OSGiBundleProcessor bundleProcessor;
public OSGiBundleReferenceModelResolver(Contribution contribution, FactoryExtensionPoint modelFactories) {
this.contribution = contribution;
this.bundleProcessor = new OSGiBundleProcessor();
}
public void addModel(Object resolved, ProcessorContext context) {
BundleReference bundleRef = (BundleReference)resolved;
refs.put(bundleRef, bundleRef);
}
public Object removeModel(Object resolved, ProcessorContext context) {
return refs.remove(resolved);
}
/**
* Handle artifact resolution when the specific class reference is imported from another contribution
* @param unresolved
* @param context
* @return
*/
private BundleReference resolveImportedModel(BundleReference unresolved, ProcessorContext context) {
BundleReference resolved = unresolved;
if (this.contribution != null) {
for (Import import_ : this.contribution.getImports()) {
resolved = import_.getModelResolver().resolveModel(BundleReference.class, unresolved, context);
if (resolved != unresolved)
break;
}
}
return resolved;
}
public <T> T resolveModel(Class<T> modelClass, T unresolved, ProcessorContext context) {
Object resolved = refs.get(unresolved);
if (resolved != null) {
return modelClass.cast(resolved);
}
if (OSGiBundleActivator.getBundleContext() == null)
return unresolved;
//Load a class on demand
Bundle bundle = null;
String bundleName = ((BundleReference)unresolved).getSymbolicName();
String bundleVersion = ((BundleReference)unresolved).getVersion();
bundle = OSGiBundleActivator.findBundle(bundleName, bundleVersion);
BundleReference bundleReference;
if (bundle == null) {
bundleReference = bundleProcessor.installNestedBundle(contribution, bundleName, bundleVersion);
} else {
bundleReference = new BundleReference(bundle);
}
if (bundleReference != null) {
//if we load the class
refs.put(((BundleReference)unresolved), bundleReference);
// Return the resolved BundleReference
return modelClass.cast(bundleReference);
} else {
//delegate resolution of the class
resolved = this.resolveImportedModel((BundleReference)unresolved, context);
return modelClass.cast(resolved);
}
}
}
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