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Diffstat (limited to 'branches/sca-java-2.0-M2/modules/contribution-java/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java')
-rw-r--r-- | branches/sca-java-2.0-M2/modules/contribution-java/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/branches/sca-java-2.0-M2/modules/contribution-java/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java b/branches/sca-java-2.0-M2/modules/contribution-java/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java new file mode 100644 index 0000000000..135b3fbb69 --- /dev/null +++ b/branches/sca-java-2.0-M2/modules/contribution-java/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassLoaderModelResolver.java @@ -0,0 +1,159 @@ +/* + * 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.java.impl; + +import java.io.IOException; +import java.net.MalformedURLException; +import java.net.URL; +import java.net.URLClassLoader; +import java.util.ArrayList; +import java.util.Collections; +import java.util.Enumeration; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +import org.apache.tuscany.sca.contribution.Contribution; +import org.apache.tuscany.sca.contribution.Import; +import org.apache.tuscany.sca.contribution.java.JavaImport; +import org.apache.tuscany.sca.contribution.resolver.ClassReference; +import org.apache.tuscany.sca.contribution.resolver.DefaultDelegatingModelResolver; +import org.apache.tuscany.sca.contribution.resolver.ModelResolver; +import org.apache.tuscany.sca.core.FactoryExtensionPoint; +import org.apache.tuscany.sca.extensibility.ServiceDiscovery; + +/** + * A Model Resolver for ClassReferences. + * + * @version $Rev$ $Date$ + */ +public class ClassLoaderModelResolver extends URLClassLoader implements ModelResolver { + private Contribution contribution; + private Map<String, ModelResolver> importResolvers = new HashMap<String, ModelResolver>(); + + private static ClassLoader parentClassLoader() { + ClassLoader parentClassLoader = ServiceDiscovery.getInstance().getServiceDiscoverer().getClass().getClassLoader(); + return parentClassLoader; + } + + public ClassLoaderModelResolver(final Contribution contribution, FactoryExtensionPoint modelFactories) throws MalformedURLException { + super(new URL[] {new URL(contribution.getLocation())}, parentClassLoader()); + this.contribution = contribution; + + // Index Java import resolvers by package name + Map<String, List<ModelResolver>> resolverMap = new HashMap<String, List<ModelResolver>>(); + for (Import import_: this.contribution.getImports()) { + if (import_ instanceof JavaImport) { + JavaImport javaImport = (JavaImport)import_; + List<ModelResolver> resolvers = resolverMap.get(javaImport.getPackage()); + if (resolvers == null) { + resolvers = new ArrayList<ModelResolver>(); + resolverMap.put(javaImport.getPackage(), resolvers); + } + resolvers.add(javaImport.getModelResolver()); + } + } + + // Create a delegating model resolver for each imported package + for (Map.Entry<String, List<ModelResolver>> entry: resolverMap.entrySet()) { + importResolvers.put(entry.getKey(), new DefaultDelegatingModelResolver(entry.getValue())); + } + } + + public void addModel(Object resolved) { + throw new IllegalStateException(); + } + + public Object removeModel(Object resolved) { + throw new IllegalStateException(); + } + + public <T> T resolveModel(Class<T> modelClass, T unresolved) { + if (!(unresolved instanceof ClassReference)) { + return unresolved; + } + + try { + + // Load the class and return a class reference for it + String className = ((ClassReference)unresolved).getClassName(); + Class<?> clazz = Class.forName(className, true, this); + return modelClass.cast(new ClassReference(clazz)); + + } catch (ClassNotFoundException e) { + return unresolved; + } catch (NoClassDefFoundError e) { + return unresolved; + } + } + + @Override + public URL findResource(String name) { + + //TODO delegate to the Java import resolvers + + URL url = super.findResource(name); + return url; + } + + @Override + public Enumeration<URL> findResources(String name) throws IOException { + + //TODO delegate to the Java import resolvers + //Enumeration<URL> importedResources; + + Enumeration<URL> resources = super.findResources(name); + List<URL> allResources = new ArrayList<URL>(); + //for (; importedResources.hasMoreElements(); ) { + // allResources.add(importedResources.nextElement()); + //} + for (; resources.hasMoreElements(); ) { + allResources.add(resources.nextElement()); + } + return Collections.enumeration(allResources); + } + + @Override + protected Class<?> findClass(String name) throws ClassNotFoundException { + + // Extract the package name + int d = name.lastIndexOf('.'); + String packageName; + if (d != -1) { + packageName = name.substring(0, d); + } else { + packageName = null; + } + + // First try to load the class using the Java import resolvers + ModelResolver importResolver = importResolvers.get(packageName); + if (importResolver != null) { + ClassReference classReference = importResolver.resolveModel(ClassReference.class, new ClassReference(name)); + if (!classReference.isUnresolved()) { + return classReference.getJavaClass(); + } + } + + // Next, try to load the class from the current contribution + Class<?> clazz = super.findClass(name); + return clazz; + } + +} |