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/**
*
* Copyright 2005 The Apache Software Foundation
*
* Licensed 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.container.java.loader;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.apache.tuscany.common.resource.ResourceLoader;
import org.apache.tuscany.container.java.assembly.JavaAssemblyFactory;
import org.apache.tuscany.container.java.assembly.JavaImplementation;
import org.apache.tuscany.core.config.ComponentTypeIntrospector;
import org.apache.tuscany.core.config.ConfigurationLoadException;
import org.apache.tuscany.core.config.InvalidRootElementException;
import org.apache.tuscany.core.config.JavaIntrospectionHelper;
import org.apache.tuscany.core.config.SidefileLoadException;
import org.apache.tuscany.core.config.processor.ProcessorUtils;
import org.apache.tuscany.core.loader.LoaderContext;
import org.apache.tuscany.core.loader.StAXElementLoader;
import org.apache.tuscany.core.loader.StAXLoaderRegistry;
import org.apache.tuscany.core.loader.assembly.AssemblyConstants;
import org.apache.tuscany.core.system.annotation.Autowire;
import org.apache.tuscany.model.assembly.ComponentType;
import org.osoa.sca.annotations.Destroy;
import org.osoa.sca.annotations.Init;
import org.osoa.sca.annotations.Scope;
/**
* @version $Rev$ $Date$
*/
@Scope("MODULE")
public class JavaImplementationLoader implements StAXElementLoader<JavaImplementation> {
public static final QName IMPLEMENTATION_JAVA = new QName("http://www.osoa.org/xmlns/sca/0.9", "implementation.java");
private StAXLoaderRegistry registry;
private XMLInputFactory xmlFactory;
private JavaAssemblyFactory factory;
private ComponentTypeIntrospector introspector;
public JavaImplementationLoader() {
// todo make this a reference to a system service
xmlFactory = XMLInputFactory.newInstance();
}
@Autowire
public void setRegistry(StAXLoaderRegistry registry) {
this.registry = registry;
}
@Autowire
public void setFactory(JavaAssemblyFactory factory) {
this.factory = factory;
//FIXME JFM HACK
introspector = ProcessorUtils.createCoreIntrospector(factory);
}
@Init(eager = true)
public void start() {
registry.registerLoader(IMPLEMENTATION_JAVA, this);
}
@Destroy
public void stop() {
registry.unregisterLoader(IMPLEMENTATION_JAVA, this);
}
public JavaImplementation load(XMLStreamReader reader, LoaderContext loaderContext) throws XMLStreamException, ConfigurationLoadException {
JavaImplementation javaImpl = factory.createJavaImplementation();
String typeName = reader.getAttributeValue(null, "class");
Class<?> implementationClass = getImplementationClass(loaderContext.getResourceLoader(), typeName);
javaImpl.setImplementationClass(implementationClass);
javaImpl.setComponentType(loadComponentType(loaderContext, implementationClass));
return javaImpl;
}
protected Class<?> getImplementationClass(ResourceLoader resourceLoader, String typeName) throws ConfigurationLoadException {
ClassLoader oldCL = Thread.currentThread().getContextClassLoader();
try {
// set TCCL in case the application code needs it
Thread.currentThread().setContextClassLoader(resourceLoader.getClassLoader());
return resourceLoader.loadClass(typeName);
} catch (ClassNotFoundException e) {
throw new ConfigurationLoadException(e.getMessage(), e);
} finally {
Thread.currentThread().setContextClassLoader(oldCL);
}
}
protected ComponentType loadComponentType(LoaderContext loaderContext, Class<?> implClass) throws ConfigurationLoadException, XMLStreamException {
String baseName = JavaIntrospectionHelper.getBaseName(implClass);
URL sidefile = implClass.getResource(baseName + ".componentType");
if (sidefile == null) {
return loadComponentTypeByIntrospection(implClass);
} else {
return loadComponentTypeFromSidefile(sidefile, loaderContext);
}
}
protected ComponentType loadComponentTypeByIntrospection(Class<?> implClass) throws ConfigurationLoadException {
return introspector.introspect(implClass);
}
protected ComponentType loadComponentTypeFromSidefile(URL sidefile, LoaderContext loaderContext) throws SidefileLoadException {
try {
XMLStreamReader reader;
InputStream is;
is = sidefile.openStream();
try {
reader = xmlFactory.createXMLStreamReader(is);
try {
reader.nextTag();
if (!AssemblyConstants.COMPONENT_TYPE.equals(reader.getName())) {
InvalidRootElementException e = new InvalidRootElementException(AssemblyConstants.COMPONENT_TYPE, reader.getName());
e.setResourceURI(sidefile.toString());
throw e;
}
return (ComponentType) registry.load(reader, loaderContext);
} finally {
try {
reader.close();
} catch (XMLStreamException e) {
// ignore
}
}
} finally {
try {
is.close();
} catch (IOException e) {
// ignore
}
}
} catch (IOException e) {
SidefileLoadException sfe = new SidefileLoadException(e.getMessage());
sfe.setResourceURI(sidefile.toString());
throw sfe;
} catch (XMLStreamException e) {
SidefileLoadException sfe = new SidefileLoadException(e.getMessage());
sfe.setResourceURI(sidefile.toString());
throw sfe;
} catch (ConfigurationLoadException e) {
SidefileLoadException sfe = new SidefileLoadException(e.getMessage());
sfe.setResourceURI(sidefile.toString());
throw sfe;
}
}
}
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