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author | slaws <slaws@13f79535-47bb-0310-9956-ffa450edef68> | 2010-11-02 13:01:07 +0000 |
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committer | slaws <slaws@13f79535-47bb-0310-9956-ffa450edef68> | 2010-11-02 13:01:07 +0000 |
commit | 54dcf777e655a94049d8000f8f7b15846f1d54e6 (patch) | |
tree | a2cc990cf48e1377396b975fff9855ecfd18f1e0 /sca-java-2.x/tags/2.0-Beta1-RC2/modules/implementation-spring/src/main/java/org/apache/tuscany/sca/implementation/spring/xml/SpringImplementationProcessor.java | |
parent | cab9e5e0c2ee4bd15ba65625fd9ff75ced777c75 (diff) |
Tag for 2.0-Beta1-RC2
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1030026 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'sca-java-2.x/tags/2.0-Beta1-RC2/modules/implementation-spring/src/main/java/org/apache/tuscany/sca/implementation/spring/xml/SpringImplementationProcessor.java')
-rw-r--r-- | sca-java-2.x/tags/2.0-Beta1-RC2/modules/implementation-spring/src/main/java/org/apache/tuscany/sca/implementation/spring/xml/SpringImplementationProcessor.java | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0-Beta1-RC2/modules/implementation-spring/src/main/java/org/apache/tuscany/sca/implementation/spring/xml/SpringImplementationProcessor.java b/sca-java-2.x/tags/2.0-Beta1-RC2/modules/implementation-spring/src/main/java/org/apache/tuscany/sca/implementation/spring/xml/SpringImplementationProcessor.java new file mode 100644 index 0000000000..4b4144f0c8 --- /dev/null +++ b/sca-java-2.x/tags/2.0-Beta1-RC2/modules/implementation-spring/src/main/java/org/apache/tuscany/sca/implementation/spring/xml/SpringImplementationProcessor.java @@ -0,0 +1,244 @@ +/* + * 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.implementation.spring.xml; + +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.xml.Constants; +import org.apache.tuscany.sca.assembly.xml.PolicySubjectProcessor; +import org.apache.tuscany.sca.contribution.processor.BaseStAXArtifactProcessor; +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.ProcessorContext; +import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor; +import org.apache.tuscany.sca.contribution.resolver.ModelResolver; +import org.apache.tuscany.sca.core.ExtensionPointRegistry; +import org.apache.tuscany.sca.core.FactoryExtensionPoint; +import org.apache.tuscany.sca.implementation.spring.SpringImplementation; +import org.apache.tuscany.sca.implementation.spring.introspect.SpringXMLComponentTypeLoader; +import org.apache.tuscany.sca.monitor.Monitor; +import org.apache.tuscany.sca.monitor.Problem; +import org.apache.tuscany.sca.monitor.Problem.Severity; + +/** + * SpringArtifactProcessor is responsible for processing the XML of an <implementation.spring.../> + * element in an SCA SCDL file. + * + * @version $Rev$ $Date$ + */ +public class SpringImplementationProcessor extends BaseStAXArtifactProcessor implements + StAXArtifactProcessor<SpringImplementation> { + + private static final String LOCATION = "location"; + private static final String IMPLEMENTATION_SPRING = "implementation.spring"; + private static final QName IMPLEMENTATION_SPRING_QNAME = new QName(Constants.SCA11_NS, IMPLEMENTATION_SPRING); + private static final String MSG_LOCATION_MISSING = "Reading implementation.spring - location attribute missing"; + + private ExtensionPointRegistry registry; + private AssemblyFactory assemblyFactory; + private PolicySubjectProcessor policyProcessor; + + private FactoryExtensionPoint factories; + + public SpringImplementationProcessor(ExtensionPointRegistry registry) { + this.registry = registry; + this.factories = registry.getExtensionPoint(FactoryExtensionPoint.class); + this.assemblyFactory = factories.getFactory(AssemblyFactory.class); + this.policyProcessor = new PolicySubjectProcessor(registry); + } + + /** + * Report a exception. + * + * @param problems + * @param message + * @param model + */ + private void error(Monitor monitor, String message, Object model, Exception ex) { + if (monitor != null) { + Problem problem = + monitor.createProblem(this.getClass().getName(), + "impl-spring-validation-messages", + Severity.ERROR, + model, + message, + ex); + monitor.problem(problem); + } + } + + /** + * Report a error. + * + * @param problems + * @param message + * @param model + */ + private void error(Monitor monitor, String message, Object model, Object... messageParameters) { + if (monitor != null) { + Problem problem = + monitor.createProblem(this.getClass().getName(), + "impl-spring-validation-messages", + Severity.ERROR, + model, + message, + (Object[])messageParameters); + monitor.problem(problem); + } + } + + /* + * Read the XML and parse out the attributes. + * + * <implementation.spring.../> has a single required attribute: + * "location" - which is the target URI of of an archive file or a directory that contains the Spring + * application context files. + * If the resource identified by the location attribute is an archive file, then the file + * META-INF/MANIFEST.MF is read from the archive. + * If the location URI identifies a directory, then META-INF/MANIFEST.MF must exist + * underneath that directory. + * If the manifest file contains a header "Spring-Context" of the format: + * Spring-Context ::= path ( ';' path )* + * + * Where path is a relative path with respect to the location URI, then the set of paths + * specified in the header identify the context configuration files. + * If there is no MANIFEST.MF file or no Spring-Context header within that file, + * then the default behaviour is to build an application context using all the *.xml files + * in the META-INF/spring directory. + */ + public SpringImplementation read(XMLStreamReader reader, ProcessorContext context) + throws ContributionReadException, XMLStreamException { + + // Create the Spring implementation + SpringImplementation springImplementation = null; + + // Read the location attribute for the spring implementation + String springLocation = getURIString(reader, LOCATION); + if (springLocation != null) { + springImplementation = new SpringImplementation(); + springImplementation.setLocation(springLocation); + springImplementation.setUnresolved(true); + processComponentType(springImplementation); + } else { + error(context.getMonitor(), "LocationAttributeMissing", reader); + //throw new ContributionReadException(MSG_LOCATION_MISSING); + } + + // Read policies + policyProcessor.readPolicies(springImplementation, reader); + + // Skip to end element + while (reader.hasNext()) { + if (reader.next() == END_ELEMENT && IMPLEMENTATION_SPRING_QNAME.equals(reader.getName())) { + break; + } + } // end while + + return springImplementation; + } // end read + + /* + * Handles the component type for the Spring implementation + * @param springImplementation - a Spring implementation. The component type information + * is created for this implementation + * + */ + private void processComponentType(SpringImplementation springImplementation) { + + // Create a ComponentType and mark it unresolved + ComponentType componentType = assemblyFactory.createComponentType(); + componentType.setUnresolved(true); + springImplementation.setComponentType(componentType); + } // end processComponentType + + /* + * Write out the XML representation of the Spring implementation + * <implementation.spring location="..." /> + */ + public void write(SpringImplementation springImplementation, XMLStreamWriter writer, ProcessorContext context) + throws ContributionWriteException, XMLStreamException { + + // Write <implementation.spring> + writer.writeStartElement(Constants.SCA11_NS, IMPLEMENTATION_SPRING); + policyProcessor.writePolicyAttributes(springImplementation, writer); + + if (springImplementation.getLocation() != null) { + writer.writeAttribute(LOCATION, springImplementation.getLocation()); + } + + writer.writeEndElement(); + + } // end write + + /** + * Resolves the Spring implementation - loads the Spring application-context XML and + * derives the spring implementation componentType from it + */ + public void resolve(SpringImplementation springImplementation, ModelResolver resolver, ProcessorContext context) + throws ContributionResolveException { + + if (springImplementation == null) + return; + + Monitor monitor = context.getMonitor(); + /* Load the Spring component type by reading the Spring application context */ + SpringXMLComponentTypeLoader springLoader = new SpringXMLComponentTypeLoader(registry); + try { + // Load the Spring Implementation information from its application context file... + springLoader.load(springImplementation, resolver, context); + } catch (ContributionReadException e) { + ContributionResolveException ce = new ContributionResolveException(e); + error(monitor, "ContributionResolveException", resolver, ce); + throw ce; + } + + ComponentType ct = springImplementation.getComponentType(); + if (ct.isUnresolved()) { + // If the introspection fails to resolve, try to find a side file... + ComponentType componentType = resolver.resolveModel(ComponentType.class, ct, context); + if (componentType.isUnresolved()) { + error(monitor, "UnableToResolveComponentType", resolver); + //throw new ContributionResolveException("SpringArtifactProcessor: unable to resolve componentType for Spring component"); + } else { + springImplementation.setComponentType(componentType); + springImplementation.setUnresolved(false); + } + + } // end if + + } // end method resolve + + public QName getArtifactType() { + return IMPLEMENTATION_SPRING_QNAME; + } + + public Class<SpringImplementation> getModelType() { + return SpringImplementation.class; + } + +} // end class SpringArtifactProcessor |