diff options
Diffstat (limited to 'sca-java-1.x/tags/1.2/modules/contribution-java/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassReferenceModelResolver.java')
-rw-r--r-- | sca-java-1.x/tags/1.2/modules/contribution-java/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassReferenceModelResolver.java | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/1.2/modules/contribution-java/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassReferenceModelResolver.java b/sca-java-1.x/tags/1.2/modules/contribution-java/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassReferenceModelResolver.java new file mode 100644 index 0000000000..4946002b14 --- /dev/null +++ b/sca-java-1.x/tags/1.2/modules/contribution-java/src/main/java/org/apache/tuscany/sca/contribution/java/impl/ClassReferenceModelResolver.java @@ -0,0 +1,134 @@ +/* + * 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.lang.ref.WeakReference; +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; +import org.apache.tuscany.sca.contribution.resolver.ClassReference; +import org.apache.tuscany.sca.contribution.resolver.ModelResolver; + +/** + * A Model Resolver for ClassReferences. + * + * @version $Rev: 557916 $ $Date: 2007-07-20 01:04:40 -0700 (Fri, 20 Jul 2007) $ + */ +public class ClassReferenceModelResolver implements ModelResolver { + private Contribution contribution; + private WeakReference<ClassLoader> classLoader; + private Map<String, ClassReference> map = new HashMap<String, ClassReference>(); + + private ModelResolver osgiResolver; + + public ClassReferenceModelResolver(Contribution contribution, ModelFactoryExtensionPoint modelFactories) { + this.contribution = contribution; + if (this.contribution != null) { + ClassLoader cl = contribution.getClassLoader(); + if (contribution.getClassLoader() == null) { + cl = new ContributionClassLoader(contribution, null); + contribution.setClassLoader(cl); + } + this.classLoader = new WeakReference<ClassLoader>(cl); + } else { + // This path should be used only for unit testing. + this.classLoader = new WeakReference<ClassLoader>(this.getClass().getClassLoader()); + } + + try { + Class<?> osgiResolverClass = + Class.forName("org.apache.tuscany.sca.contribution.osgi.impl.OSGiClassReferenceModelResolver"); + if (osgiResolverClass != null) { + Constructor constructor = + osgiResolverClass.getConstructor(Contribution.class, ModelFactoryExtensionPoint.class); + this.osgiResolver = (ModelResolver)constructor.newInstance(contribution, modelFactories); + } + } catch (Throwable e) { + // Ignore error, non-OSGi classloading is used in this case + } + } + + 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()); + } + + + + public <T> T resolveModel(Class<T> modelClass, T unresolved) { + if (!(unresolved instanceof ClassReference)) { + return unresolved; + } + Object resolved = map.get(((ClassReference)unresolved).getClassName()); + + if (resolved != null) { + return modelClass.cast(resolved); + } + + //Load a class on demand + Class clazz = null; + + if (osgiResolver != null) { + resolved = osgiResolver.resolveModel(modelClass, unresolved); + clazz = ((ClassReference)resolved).getJavaClass(); + } + + if (clazz == null) { + try { + // Search contribution classloader (which has visibility of classes in the contribution + // as well as explicitly imported packages from other contributions) + clazz = Class.forName(((ClassReference)unresolved).getClassName(), true, classLoader.get()); + } catch (ClassNotFoundException e) { + } catch (NoClassDefFoundError e) { + } + } + + if (clazz != null) { + //if we load the class + // Store a new ClassReference wrappering the loaded class + ClassReference classReference = new ClassReference(clazz); + map.put(clazz.getName(), classReference); + + // Return the resolved ClassReference + return modelClass.cast(classReference); + } else { + return unresolved; + } + + } + + + /*************** + * Helper methods + ***************/ + + private String getPackageName(ClassReference clazz) { + int pos = clazz.getClassName().lastIndexOf("."); + return clazz.getClassName().substring(0, pos); + } + +} |