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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.io.InputStream;
import java.lang.reflect.Constructor;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.tuscany.sca.contribution.service.ContributionException;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
/**
* Default implementation of a package processor extension point.
*
* @version $Rev$ $Date$
*/
public class DefaultPackageProcessorExtensionPoint implements PackageProcessorExtensionPoint {
private Map<String, PackageProcessor> processors = new HashMap<String, PackageProcessor>();
private boolean loaded;
public DefaultPackageProcessorExtensionPoint() {
}
public void addPackageProcessor(PackageProcessor processor) {
processors.put(processor.getPackageType(), processor);
}
public void removePackageProcessor(PackageProcessor processor) {
processors.remove(processor.getPackageType());
}
public PackageProcessor getPackageProcessor(String contentType) {
loadProcessors();
return processors.get(contentType);
}
private synchronized void loadProcessors() {
if (loaded)
return;
// Get the processor service declarations
Set<ServiceDeclaration> processorDeclarations;
try {
processorDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(PackageProcessor.class);
} catch (IOException e) {
throw new IllegalStateException(e);
}
for (ServiceDeclaration processorDeclaration: processorDeclarations) {
Map<String, String> attributes = processorDeclaration.getAttributes();
// Load a URL artifact processor
String packageType = attributes.get("type");
// Create a processor wrapper and register it
PackageProcessor processor = new LazyPackageProcessor(packageType, processorDeclaration);
addPackageProcessor(processor);
}
loaded = true;
}
/**
* A facade for package processors.
*/
private static class LazyPackageProcessor implements PackageProcessor {
private ServiceDeclaration processorDeclaration;
private String packageType;
private PackageProcessor processor;
private LazyPackageProcessor(String packageType, ServiceDeclaration processorDeclaration) {
this.processorDeclaration = processorDeclaration;
this.packageType = packageType;
}
public URL getArtifactURL(URL packageSourceURL, URI artifact) throws MalformedURLException {
return getProcessor().getArtifactURL(packageSourceURL, artifact);
}
public List<URI> getArtifacts(URL packageSourceURL, InputStream inputStream) throws ContributionException, IOException {
return getProcessor().getArtifacts(packageSourceURL, inputStream);
}
public String getPackageType() {
return packageType;
}
@SuppressWarnings("unchecked")
private PackageProcessor getProcessor() {
if (processor == null) {
try {
Class<PackageProcessor> processorClass = (Class<PackageProcessor>)processorDeclaration.loadClass();
Constructor<PackageProcessor> constructor = processorClass.getConstructor();
processor = constructor.newInstance();
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return processor;
}
}
}
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