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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.resolver.ClassReference;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.osgi.runtime.OSGiRuntime;
import org.osgi.framework.Bundle;
/**
* A Model Resolver for ClassReferences.
*
* @version $Rev$ $Date$
*/
public class OSGiClassReferenceModelResolver implements ModelResolver {
private Contribution contribution;
private Map<String, ClassReference> map = new HashMap<String, ClassReference>();
private Bundle bundle;
private boolean initialized;
private boolean useOSGi;
public OSGiClassReferenceModelResolver(Contribution contribution, ExtensionPointRegistry registry) {
this.contribution = contribution;
}
public void addModel(Object resolved) {
ClassReference clazz = (ClassReference)resolved;
map.put(clazz.getClassName(), clazz);
}
public Object removeModel(Object resolved) {
return map.remove(((ClassReference)resolved).getClassName());
}
/**
* Handle artifact resolution when the specific class reference is imported from another contribution
* @param unresolved
* @return
*/
private ClassReference resolveImportedModel(ClassReference unresolved) {
ClassReference resolved = unresolved;
if (this.contribution != null) {
for (Import import_ : this.contribution.getImports()) {
if (resolved == unresolved && bundle != null) {
resolved = import_.getModelResolver().resolveModel(ClassReference.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();
if (!useOSGi)
return unresolved;
//Load a class on demand
Class clazz = null;
if (bundle != null) {
try {
clazz = bundle.loadClass(((ClassReference)unresolved).getClassName());
} catch (Exception e) {
// we will later try to delegate to imported model resolvers
}
}
if (clazz != null) {
//if we load the class
// Store a new ClassReference wrapping the loaded class
ClassReference classReference = new ClassReference(clazz);
map.put(getPackageName(classReference), classReference);
// Return the resolved ClassReference
return modelClass.cast(classReference);
} else {
//delegate resolution of the class
resolved = this.resolveImportedModel((ClassReference)unresolved);
return modelClass.cast(resolved);
}
}
/***************
* Helper methods
***************/
private String getPackageName(ClassReference clazz) {
int pos = clazz.getClassName().lastIndexOf(".");
return clazz.getClassName().substring(0, pos - 1);
}
private void initialize() {
if (initialized)
return;
initialized = true;
try {
bundle = OSGiRuntime.findInstalledBundle(contribution.getLocation());
useOSGi = bundle != null;
} catch (Throwable e) {
// Ignore errors, default to ClassReferenceModelResolver
}
}
}
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