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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* 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.extension.loader;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.apache.tuscany.core.config.ConfigurationLoadException;
import org.apache.tuscany.core.config.InvalidRootElementException;
import org.apache.tuscany.core.config.MissingResourceException;
import org.apache.tuscany.core.config.SidefileLoadException;
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.apache.tuscany.model.assembly.Implementation;
import org.osoa.sca.annotations.Scope;
/**
* Abstract implementation loader.
*
*/
@Scope("MODULE")
public abstract class AbstractImplementationLoader<T extends Implementation> implements StAXElementLoader<T> {
// Injected Stax loader registry.
protected StAXLoaderRegistry registry;
// XML input factory.
protected XMLInputFactory xmlFactory;
/**
* Initializes the XML input factory.
*
*/
public AbstractImplementationLoader() {
xmlFactory = XMLInputFactory.newInstance();
}
/**
* Injection method for Stax loader registry.
* @param registry Stax loader registry.
*/
@Autowire
public void setRegistry(StAXLoaderRegistry registry) {
this.registry = registry;
}
/**
* Loads the Groovy implementation.
*
* @param Stax XML stream reader.
* @param loaderContext Loader context.
* @return Groovy implementation.
*/
public T load(XMLStreamReader reader, LoaderContext loaderContext) throws XMLStreamException, ConfigurationLoadException {
T assemblyObject = getAssemblyObject(reader, loaderContext);
URL componentTypeFile = getSideFile(reader, loaderContext);
ComponentType componentType = loadComponentType(componentTypeFile, loaderContext);
assemblyObject.setComponentType(componentType);
return assemblyObject;
}
/**
* Required to be implemented by the concrete classes.
* @return Implementation object.
*/
protected abstract T getAssemblyObject(XMLStreamReader reader, LoaderContext loaderContext);
/**
* Gets the side file.
*
* @param reader Reader for the module file.
* @param loaderContext Loader context.
* @return Side file Url.
* @throws MissingResourceException
*/
protected abstract URL getSideFile(XMLStreamReader reader, LoaderContext loaderContext) throws MissingResourceException;
/**
* Loads the SIDE file to get the component information.
*
* @param scriptFile SCript file name.
* @param loaderContext Loader context.
* @return Component information.
* @throws SidefileLoadException
* @throws MissingResourceException
*/
private ComponentType loadComponentType(URL componentTypeFile, LoaderContext loaderContext) throws SidefileLoadException, MissingResourceException{
XMLStreamReader reader = null;
InputStream is = null;
try {
is = componentTypeFile.openStream();
reader = xmlFactory.createXMLStreamReader(is);
reader.nextTag();
if (!AssemblyConstants.COMPONENT_TYPE.equals(reader.getName())) {
InvalidRootElementException e = new InvalidRootElementException(AssemblyConstants.COMPONENT_TYPE, reader.getName());
e.setResourceURI(componentTypeFile.toString());
throw e;
}
return (ComponentType) registry.load(reader, loaderContext);
} catch (IOException e) {
SidefileLoadException sfe = new SidefileLoadException(e.getMessage());
sfe.setResourceURI(componentTypeFile.toString());
throw sfe;
} catch (XMLStreamException e) {
SidefileLoadException sfe = new SidefileLoadException(e.getMessage());
sfe.setResourceURI(componentTypeFile.toString());
throw sfe;
} catch (ConfigurationLoadException e) {
SidefileLoadException sfe = new SidefileLoadException(e.getMessage());
sfe.setResourceURI(componentTypeFile.toString());
throw sfe;
} finally {
try {
if(reader != null) {
reader.close();
}
} catch (XMLStreamException e) {
// ignore
}
try {
if(is != null) {
is.close();
}
} catch (IOException e) {
// ignore
}
}
}
}
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