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Diffstat (limited to 'sca-java-1.x/branches/sca-java-1.2.1/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java')
-rw-r--r-- | sca-java-1.x/branches/sca-java-1.2.1/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/sca-java-1.x/branches/sca-java-1.2.1/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java b/sca-java-1.x/branches/sca-java-1.2.1/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java new file mode 100644 index 0000000000..cb8f6ac18d --- /dev/null +++ b/sca-java-1.x/branches/sca-java-1.2.1/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.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.extensibility; + +import java.lang.ref.WeakReference; +import java.net.URL; +import java.util.Map; + +/** + * Service declaration using J2SE Jar service provider spec Classes specified + * inside this declaration are loaded using the classloader used to read the + * configuration file corresponding to this declaration. + */ +public class ServiceDeclaration { + + private WeakReference<ClassLoader> classLoader; + + private String className; + + private Map<String, String> attributes; + + /** + * Service declaration constructor + * + * @param className Service implementation classname + * @param classLoader Classloader corresponding to this service + * implementation + * @param attributes Optional attributes for this service declaration + */ + public ServiceDeclaration(String className, ClassLoader classLoader, Map<String, String> attributes) { + + this.className = className; + this.classLoader = new WeakReference<ClassLoader>(classLoader); + this.attributes = attributes; + } + + /** + * Load this service implementation class + * + * @return Class + * @throws ClassNotFoundException + */ + @SuppressWarnings("unchecked") + public Class<?> loadClass() throws ClassNotFoundException { + + return Class.forName(className, true, classLoader.get()); + } + + /** + * Load another class using the classloader of this service implementation + * + * @param anotherClassName + * @return Class + * @throws ClassNotFoundException + */ + public Class<?> loadClass(String anotherClassName) throws ClassNotFoundException { + + return Class.forName(anotherClassName, true, classLoader.get()); + } + + /** + * Return the resource corresponding to this service implementation class + * + * @return resource URL + */ + public URL getResource() { + return classLoader.get().getResource(className); + } + + /** + * Classloader associated with this service declaration + * + * @return classloader + */ + public ClassLoader getClassLoader() { + return classLoader.get(); + } + + /** + * Service implementation class corresponding to this declaration + * + * @return classname + */ + public String getClassName() { + return className; + } + + /** + * Attributes specified for this declaration + * + * @return attributes + */ + public Map<String, String> getAttributes() { + return attributes; + } + + /** + * Equals method used to ensure that each service declaration is stored only + * once in a set of declarations. + */ + @Override + public boolean equals(Object o) { + if (!(o instanceof ServiceDeclaration)) + return false; + ServiceDeclaration s = (ServiceDeclaration)o; + if (!className.equals(s.className)) + return false; + else if (!classLoader.equals(s.classLoader)) + return false; + else if (attributes == null) + return s.attributes == null; + else + return attributes.equals(s.attributes); + + } + +} |