From b771a05508db61cb1748d2fed0eb92daf173ff92 Mon Sep 17 00:00:00 2001 From: rsivaram Date: Thu, 16 Oct 2008 11:51:49 +0000 Subject: Copy modules for event prototype git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@705212 13f79535-47bb-0310-9956-ffa450edef68 --- .../ExtensibleStAXAttributeProcessor.java | 247 +++++++++++++++++++++ 1 file changed, 247 insertions(+) create mode 100644 sandbox/event/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleStAXAttributeProcessor.java (limited to 'sandbox/event/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleStAXAttributeProcessor.java') diff --git a/sandbox/event/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleStAXAttributeProcessor.java b/sandbox/event/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleStAXAttributeProcessor.java new file mode 100644 index 0000000000..29c2af7513 --- /dev/null +++ b/sandbox/event/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/processor/ExtensibleStAXAttributeProcessor.java @@ -0,0 +1,247 @@ +/* + * 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.InputStream; +import java.io.OutputStream; +import java.util.logging.Level; +import java.util.logging.Logger; + +import javax.xml.namespace.QName; +import javax.xml.stream.Location; +import javax.xml.stream.XMLInputFactory; +import javax.xml.stream.XMLOutputFactory; +import javax.xml.stream.XMLStreamConstants; +import javax.xml.stream.XMLStreamException; +import javax.xml.stream.XMLStreamReader; +import javax.xml.stream.XMLStreamWriter; + +import org.apache.tuscany.sca.assembly.builder.impl.ProblemImpl; +import org.apache.tuscany.sca.contribution.Constants; +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.contribution.service.ContributionWriteException; +import org.apache.tuscany.sca.monitor.Monitor; +import org.apache.tuscany.sca.monitor.Problem; +import org.apache.tuscany.sca.monitor.Problem.Severity; + +/** + * Implementation of an extensible StAX attribute processor. + * + * Takes a StAXAttributeProcessorExtensionPoint and delegates to the proper + * StAXAttributeProcessor by attribute QName + * + * @version $Rev$ $Date$ + */ +public class ExtensibleStAXAttributeProcessor + implements StAXAttributeProcessor { + + private static final Logger logger = Logger.getLogger(ExtensibleStAXAttributeProcessor.class.getName()); + + private static final QName UNKNOWN_ATTRIBUTE = new QName(Constants.SCA10_TUSCANY_NS, "unknown"); + + private XMLInputFactory inputFactory; + private XMLOutputFactory outputFactory; + private StAXAttributeProcessorExtensionPoint processors; + private Monitor monitor; + + /** + * Constructs a new ExtensibleStAXArtifactProcessor. + * @param processors + * @param inputFactory + * @param outputFactory + */ + public ExtensibleStAXAttributeProcessor(StAXAttributeProcessorExtensionPoint processors, + XMLInputFactory inputFactory, + XMLOutputFactory outputFactory, + Monitor monitor) { + super(); + this.processors = processors; + this.inputFactory = inputFactory; + this.outputFactory = outputFactory; + if (this.outputFactory != null) { + this.outputFactory.setProperty("javax.xml.stream.isRepairingNamespaces", Boolean.TRUE); + } + this.monitor = monitor; + } + + /** + * Report a warning. + * + * @param problems + * @param message + * @param model + */ + private void warning(String message, Object model, Object... messageParameters) { + if (monitor != null) { + Problem problem = new ProblemImpl(this.getClass().getName(), "contribution-validation-messages", Severity.WARNING, model, message, (Object[])messageParameters); + monitor.problem(problem); + } + } + + /** + * Report a error. + * + * @param problems + * @param message + * @param model + */ + private void error(String message, Object model, Object... messageParameters) { + if (monitor != null) { + Problem problem = new ProblemImpl(this.getClass().getName(), "contribution-validation-messages", Severity.ERROR, model, message, (Object[])messageParameters); + monitor.problem(problem); + } + } + + /** + * Report a exception. + * + * @param problems + * @param message + * @param model + */ + private void error(String message, Object model, Exception ex) { + if (monitor != null) { + Problem problem = new ProblemImpl(this.getClass().getName(), "contribution-validation-messages", Severity.ERROR, model, message, ex); + monitor.problem(problem); + } + } + + + public Object read(QName attributeName, XMLStreamReader source) throws ContributionReadException, XMLStreamException { + + // Delegate to the processor associated with the attribute QName + int event = source.getEventType(); + if (event == XMLStreamConstants.START_DOCUMENT) { + source.nextTag(); + } + + StAXAttributeProcessor processor = null; + + //lookup for registered attribute processors + processor = (StAXAttributeProcessor)processors.getProcessor(attributeName); + if (processor == null) { + Location location = source.getLocation(); + if (logger.isLoggable(Level.WARNING)) { + logger.warning("Attribute " + attributeName + " cannot be processed. (" + location + ")"); + } + warning("AttributeCannotBeProcessed", processors, attributeName, location); + } else { + return processor.read(attributeName, source); + } + + + //handle extension attributes without processors + processor = (StAXAttributeProcessor)processors.getProcessor(UNKNOWN_ATTRIBUTE); + if (processor == null) { + Location location = source.getLocation(); + if (logger.isLoggable(Level.WARNING)) { + logger.warning("Could not find Default Attribute processor !"); + } + warning("DefaultAttributeProcessorNotAvailable", processors, UNKNOWN_ATTRIBUTE, location); + } + + return processor == null ? null : processor.read(attributeName, source); + } + + @SuppressWarnings("unchecked") + public void write(Object model, XMLStreamWriter outputSource) throws ContributionWriteException, XMLStreamException { + + if(model == null) { + return; + } + + // Delegate to the processor associated with the model type + StAXAttributeProcessor processor = processors.getProcessor(model.getClass()); + if(processor == null) { + if (logger.isLoggable(Level.WARNING)) { + logger.warning("No StAX processor is configured to handle " + model.getClass()); + } + warning("NoStaxProcessor", processors, model.getClass()); + } else { + processor.write(model, outputSource); + return; + } + + //handle extension attributes without processors + processor = (StAXAttributeProcessor)processors.getProcessor(UNKNOWN_ATTRIBUTE); + if(processor == null) { + if (logger.isLoggable(Level.WARNING)) { + logger.warning("No Default StAX processor is configured to handle " + model.getClass()); + } + warning("NoDefaultStaxProcessor", processors, model.getClass()); + } else { + processor.write(model, outputSource); + return; + } + } + + + + @SuppressWarnings("unchecked") + public void resolve(Object model, ModelResolver resolver) throws ContributionResolveException { + + // Delegate to the processor associated with the model type + if (model != null) { + StAXAttributeProcessor processor = processors.getProcessor(model.getClass()); + if (processor != null) { + processor.resolve(model, resolver); + } + } + } + + /** + * Read a model from an InputStream. + * @param is The artifact InputStream + * @param type Model type + * @return The model + * @throws ContributionReadException + */ + public M read(InputStream is, Class type) throws ContributionReadException { + return null; + } + + /** + * Write a model to an OutputStream. + * @param model + * @param os + * @throws ContributionWriteException + */ + public void write(Object model, OutputStream os) throws ContributionWriteException { + try { + XMLStreamWriter writer = outputFactory.createXMLStreamWriter(os); + write(model, writer); + writer.flush(); + writer.close(); + } catch (XMLStreamException e) { + ContributionWriteException cw = new ContributionWriteException(e); + error("ContributionWriteException", outputFactory, cw); + throw cw; + } + } + + public QName getArtifactType() { + return null; + } + + public Class getModelType() { + return null; + } +} -- cgit v1.2.3