diff options
Diffstat (limited to 'branches/sca-android-r643746/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java')
-rw-r--r-- | branches/sca-android-r643746/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/branches/sca-android-r643746/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java b/branches/sca-android-r643746/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java new file mode 100644 index 0000000000..574ffc5f04 --- /dev/null +++ b/branches/sca-android-r643746/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/DefaultURLArtifactProcessorExtensionPoint.java @@ -0,0 +1,167 @@ +/*
+ * 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);
+ }
+
+ }
+}
|