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Diffstat (limited to 'sca-java-2.x/branches/sca-equinox/samples/implementation-pojo-extension/src/main/java/pojo/impl/POJOImplementationProcessor.java')
-rw-r--r-- | sca-java-2.x/branches/sca-equinox/samples/implementation-pojo-extension/src/main/java/pojo/impl/POJOImplementationProcessor.java | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/sca-java-2.x/branches/sca-equinox/samples/implementation-pojo-extension/src/main/java/pojo/impl/POJOImplementationProcessor.java b/sca-java-2.x/branches/sca-equinox/samples/implementation-pojo-extension/src/main/java/pojo/impl/POJOImplementationProcessor.java new file mode 100644 index 0000000000..1c5868b674 --- /dev/null +++ b/sca-java-2.x/branches/sca-equinox/samples/implementation-pojo-extension/src/main/java/pojo/impl/POJOImplementationProcessor.java @@ -0,0 +1,174 @@ +/* + * 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 pojo.impl; + +import static javax.xml.stream.XMLStreamConstants.END_ELEMENT; + +import javax.xml.namespace.QName; +import javax.xml.stream.XMLStreamException; +import javax.xml.stream.XMLStreamReader; +import javax.xml.stream.XMLStreamWriter; + +import org.apache.tuscany.sca.assembly.AssemblyFactory; +import org.apache.tuscany.sca.assembly.ComponentType; +import org.apache.tuscany.sca.assembly.Service; +import org.apache.tuscany.sca.assembly.xml.PolicyAttachPointProcessor; +import org.apache.tuscany.sca.contribution.processor.ContributionReadException; +import org.apache.tuscany.sca.contribution.processor.ContributionResolveException; +import org.apache.tuscany.sca.contribution.processor.ContributionWriteException; +import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor; +import org.apache.tuscany.sca.contribution.resolver.ClassReference; +import org.apache.tuscany.sca.contribution.resolver.ModelResolver; +import org.apache.tuscany.sca.core.FactoryExtensionPoint; +import org.apache.tuscany.sca.interfacedef.InvalidInterfaceException; +import org.apache.tuscany.sca.interfacedef.java.JavaInterface; +import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceContract; +import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory; +import org.apache.tuscany.sca.monitor.Monitor; +import org.apache.tuscany.sca.policy.PolicyFactory; + +import pojo.POJOImplementation; +import pojo.POJOImplementationFactory; + +/** + * Implements a STAX based artifact processor for POJO implementations. + * + * The artifact processor is responsible for processing <implementation.pojo> + * elements in SCA assembly XML composite files and populating the POJO + * implementation model, resolving its references to other artifacts in the SCA + * contribution, and optionally write the model back to SCA assembly XML. + */ +public class POJOImplementationProcessor implements StAXArtifactProcessor<POJOImplementation> { + private static final QName IMPLEMENTATION_POJO = new QName("http://pojo", "implementation.pojo"); + + private AssemblyFactory assemblyFactory; + private JavaInterfaceFactory javaFactory; + private POJOImplementationFactory pojoImplementationFactory; + private PolicyFactory policyFactory; + private PolicyAttachPointProcessor policyProcessor; + + public POJOImplementationProcessor(FactoryExtensionPoint modelFactories, Monitor monitor) { + + // Get the assembly and Java interface factories as we'll need them to + // create model objects + assemblyFactory = modelFactories.getFactory(AssemblyFactory.class); + javaFactory = modelFactories.getFactory(JavaInterfaceFactory.class); + policyFactory = modelFactories.getFactory(PolicyFactory.class); + pojoImplementationFactory = modelFactories.getFactory(POJOImplementationFactory.class); + policyProcessor = new PolicyAttachPointProcessor(policyFactory); + } + + public QName getArtifactType() { + // Returns the qname of the XML element processed by this processor + return IMPLEMENTATION_POJO; + } + + public Class<POJOImplementation> getModelType() { + // Returns the type of model processed by this processor + return POJOImplementation.class; + } + + public POJOImplementation read(XMLStreamReader reader) throws ContributionReadException, XMLStreamException { + + // Read an <implementation.pojo> element + POJOImplementation implementation = pojoImplementationFactory.createPOJOImplementation(); + + // Read policies + policyProcessor.readPolicies(implementation, reader); + + // Read the POJO class attribute. + String className = reader.getAttributeValue(null, "class"); + implementation.setPOJOName(className); + + // Mark the POJO model unresolved to track the fact that it's not + // completely initialized, its class is not loaded yet and services + // and references not initialized either + implementation.setUnresolved(true); + + // Skip to end element + while (reader.hasNext()) { + if (reader.next() == END_ELEMENT && IMPLEMENTATION_POJO.equals(reader.getName())) { + break; + } + } + + return implementation; + } + + public void resolve(POJOImplementation implementation, ModelResolver resolver) throws ContributionResolveException { + + // Resolve the POJO implementation + + // First resolve its class + ClassReference classReference = new ClassReference(implementation.getPOJOName()); + classReference = resolver.resolveModel(ClassReference.class, classReference); + Class<?> pojoClass = classReference.getJavaClass(); + if (pojoClass == null) { + throw new ContributionResolveException("Class could not be resolved: " + implementation.getPOJOName()); + } + implementation.setPOJOClass(pojoClass); + + // Check to see if we have a .componentType file describing the POJO class + ComponentType componentType = assemblyFactory.createComponentType(); + componentType.setUnresolved(true); + componentType.setURI(implementation.getURI() + ".componentType"); + componentType = resolver.resolveModel(ComponentType.class, componentType); + if (!componentType.isUnresolved()) { + + // We have a component type description, merge it into the POJO model + implementation.getServices().addAll(componentType.getServices()); + implementation.getReferences().addAll(componentType.getReferences()); + implementation.getProperties().addAll(componentType.getProperties()); + + } else { + + // We have no component type description, simply introspect the POJO and + // create a single Service for it + Service service = assemblyFactory.createService(); + service.setName(pojoClass.getSimpleName()); + JavaInterface javaInterface; + try { + javaInterface = javaFactory.createJavaInterface(pojoClass); + } catch (InvalidInterfaceException e) { + throw new ContributionResolveException(e); + } + JavaInterfaceContract interfaceContract = javaFactory.createJavaInterfaceContract(); + interfaceContract.setInterface(javaInterface); + service.setInterfaceContract(interfaceContract); + implementation.getServices().add(service); + } + + // Mark the implementation resolved now + implementation.setUnresolved(false); + } + + public void write(POJOImplementation implementation, XMLStreamWriter writer) throws ContributionWriteException, XMLStreamException { + + // Write <implementation.pojo> element + policyProcessor.writePolicyPrefixes(implementation, writer); + writer.writeStartElement(IMPLEMENTATION_POJO.getNamespaceURI(), IMPLEMENTATION_POJO.getLocalPart()); + policyProcessor.writePolicyAttributes(implementation, writer); + + if (implementation.getPOJOName() != null) { + writer.writeAttribute("class", implementation.getPOJOName()); + } + + writer.writeEndElement(); + } +} |