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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.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 class name
* @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 The Service implementation class corresponding to this declaration
*/
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);
}
}
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