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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.contribution.processor;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.net.URI;
import java.net.URL;
import java.util.Map;
import java.util.Set;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.contribution.service.ContributionReadException;
import org.apache.tuscany.sca.contribution.service.ContributionResolveException;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
/**
* The default implementation of a URL artifact processor extension point.
*
* @version $Rev: 632642 $ $Date: 2008-03-01 10:16:44 -0800 (Sat, 01 Mar 2008) $
*/
public class DefaultURLArtifactProcessorExtensionPoint
extends DefaultArtifactProcessorExtensionPoint<URLArtifactProcessor>
implements URLArtifactProcessorExtensionPoint {
private ModelFactoryExtensionPoint modelFactories;
private boolean loaded;
/**
* Constructs a new extension point.
*/
public DefaultURLArtifactProcessorExtensionPoint(ModelFactoryExtensionPoint modelFactories) {
this.modelFactories = modelFactories;
}
public void addArtifactProcessor(URLArtifactProcessor artifactProcessor) {
processorsByArtifactType.put((Object)artifactProcessor.getArtifactType(), artifactProcessor);
processorsByModelType.put(artifactProcessor.getModelType(), artifactProcessor);
}
public void removeArtifactProcessor(URLArtifactProcessor artifactProcessor) {
processorsByArtifactType.remove((Object)artifactProcessor.getArtifactType());
processorsByModelType.remove(artifactProcessor.getModelType());
}
@Override
public URLArtifactProcessor getProcessor(Class<?> modelType) {
loadProcessors();
return super.getProcessor(modelType);
}
@Override
public URLArtifactProcessor getProcessor(Object artifactType) {
loadProcessors();
return super.getProcessor(artifactType);
}
/**
* Lazily load artifact processors registered in the extension point.
*/
private void loadProcessors() {
if (loaded)
return;
// Get the processor service declarations
Set<ServiceDeclaration> processorDeclarations;
try {
processorDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(URLArtifactProcessor.class);
} catch (IOException e) {
throw new IllegalStateException(e);
}
for (ServiceDeclaration processorDeclaration: processorDeclarations) {
Map<String, String> attributes = processorDeclaration.getAttributes();
// Load a URL artifact processor
String artifactType = attributes.get("type");
String modelTypeName = attributes.get("model");
// Create a processor wrapper and register it
URLArtifactProcessor processor = new LazyURLArtifactProcessor(modelFactories, artifactType, modelTypeName, processorDeclaration);
addArtifactProcessor(processor);
}
loaded = true;
}
/**
* A wrapper around an Artifact processor class allowing lazy loading and
* initialization of artifact processors.
*/
private static class LazyURLArtifactProcessor implements URLArtifactProcessor {
private ModelFactoryExtensionPoint modelFactories;
private String artifactType;
private String modelTypeName;
private ServiceDeclaration processorDeclaration;
private URLArtifactProcessor processor;
private Class<?> modelType;
LazyURLArtifactProcessor(ModelFactoryExtensionPoint modelFactories,
String artifactType,
String modelTypeName,
ServiceDeclaration processorDeclaration) {
this.modelFactories = modelFactories;
this.artifactType = artifactType;
this.modelTypeName = modelTypeName;
this.processorDeclaration = processorDeclaration;
}
public String getArtifactType() {
return artifactType;
}
@SuppressWarnings("unchecked")
private URLArtifactProcessor getProcessor() {
if (processor == null) {
try {
Class<URLArtifactProcessor> processorClass = (Class<URLArtifactProcessor>)processorDeclaration.loadClass();
Constructor<URLArtifactProcessor> constructor = processorClass.getConstructor(ModelFactoryExtensionPoint.class);
processor = constructor.newInstance(modelFactories);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return processor;
}
public Object read(URL contributionURL, URI artifactURI, URL artifactURL) throws ContributionReadException {
return getProcessor().read(contributionURL, artifactURI, artifactURL);
}
public Class<?> getModelType() {
if (modelType == null) {
try {
modelType = processorDeclaration.loadClass(modelTypeName);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return modelType;
}
@SuppressWarnings("unchecked")
public void resolve(Object model, ModelResolver resolver) throws ContributionResolveException {
getProcessor().resolve(model, resolver);
}
}
}
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