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Diffstat (limited to 'sca-java-1.x/branches/sca-java-1.2.1/modules/core-spring/src/main/java/org/apache/tuscany/sca/core/spring/context/ModelResolverImpl.java')
-rw-r--r-- | sca-java-1.x/branches/sca-java-1.2.1/modules/core-spring/src/main/java/org/apache/tuscany/sca/core/spring/context/ModelResolverImpl.java | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/sca-java-1.x/branches/sca-java-1.2.1/modules/core-spring/src/main/java/org/apache/tuscany/sca/core/spring/context/ModelResolverImpl.java b/sca-java-1.x/branches/sca-java-1.2.1/modules/core-spring/src/main/java/org/apache/tuscany/sca/core/spring/context/ModelResolverImpl.java new file mode 100644 index 0000000000..ba2d5045f2 --- /dev/null +++ b/sca-java-1.x/branches/sca-java-1.2.1/modules/core-spring/src/main/java/org/apache/tuscany/sca/core/spring/context/ModelResolverImpl.java @@ -0,0 +1,88 @@ +/* + * 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.core.spring.context; + +import java.lang.ref.WeakReference; +import java.util.HashMap; +import java.util.Map; + +import org.apache.tuscany.sca.contribution.resolver.ClassReference; +import org.apache.tuscany.sca.contribution.resolver.ModelResolver; + + +/** + * A default implementation of an artifact resolver, based on a map. + * + * @version $Rev$ $Date$ + */ +public class ModelResolverImpl implements ModelResolver { + private static final long serialVersionUID = -7826976465762296634L; + + private Map<Object, Object> map = new HashMap<Object, Object>(); + + private WeakReference<ClassLoader> classLoader; + + public ModelResolverImpl(ClassLoader classLoader) { + this.classLoader = new WeakReference<ClassLoader>(classLoader); + } + + public <T> T resolveModel(Class<T> modelClass, T unresolved) { + Object resolved = map.get(unresolved); + if (resolved != null) { + + // Return the resolved object + return modelClass.cast(resolved); + + } else if (unresolved instanceof ClassReference) { + + // Load a class on demand + ClassReference classReference = (ClassReference)unresolved; + Class clazz; + try { + clazz = Class.forName(classReference.getClassName(), true, classLoader.get()); + } catch (ClassNotFoundException e) { + + // Return the unresolved object + return unresolved; + } + + // Store a new ClassReference wrappering the loaded class + resolved = new ClassReference(clazz); + map.put(resolved, resolved); + + // Return the resolved ClassReference + return modelClass.cast(resolved); + + } else { + + // Return the unresolved object + return unresolved; + } + } + + public void addModel(Object resolved) { + map.put(resolved, resolved); + } + + public Object removeModel(Object resolved) { + return map.remove(resolved); + } + +} |