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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.implementation.node.xml;
import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
import java.util.List;
import javax.xml.namespace.QName;
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.AssemblyFactory;
import org.apache.tuscany.sca.assembly.Composite;
import org.apache.tuscany.sca.contribution.Contribution;
import org.apache.tuscany.sca.contribution.ContributionFactory;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
import org.apache.tuscany.sca.contribution.processor.BaseStAXArtifactProcessor;
import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
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.implementation.node.ConfiguredNodeImplementation;
import org.apache.tuscany.sca.implementation.node.NodeImplementationFactory;
import org.apache.tuscany.sca.monitor.Monitor;
/**
* Implements a StAX artifact processor for configured node implementations.
*
* @version $Rev$ $Date$
*/
public class ConfiguredNodeImplementationProcessor extends BaseStAXArtifactProcessor implements StAXArtifactProcessor<ConfiguredNodeImplementation> {
private static final String ATOM_NS = "http://www.w3.org/2005/Atom";
private static final QName FEED_QNAME = new QName(ATOM_NS, "feed");
private static final QName ENTRY_QNAME = new QName(ATOM_NS, "entry");
private static final QName ID_QNAME = new QName(ATOM_NS, "id");
private static final QName LINK_QNAME = new QName(ATOM_NS, "link");
private static final String HREF = "href";
private ContributionFactory contributionFactory;
private AssemblyFactory assemblyFactory;
private NodeImplementationFactory implementationFactory;
public ConfiguredNodeImplementationProcessor(ModelFactoryExtensionPoint modelFactories, Monitor monitor) {
this.contributionFactory = modelFactories.getFactory(ContributionFactory.class);
this.assemblyFactory = modelFactories.getFactory(AssemblyFactory.class);
this.implementationFactory = modelFactories.getFactory(NodeImplementationFactory.class);
}
public QName getArtifactType() {
return null;
}
public Class<ConfiguredNodeImplementation> getModelType() {
// Returns the type of model processed by this processor
return ConfiguredNodeImplementation.class;
}
public ConfiguredNodeImplementation read(XMLStreamReader reader) throws ContributionReadException, XMLStreamException {
ConfiguredNodeImplementation implementation = implementationFactory.createConfiguredNodeImplementation();
implementation.setUnresolved(true);
// Read a feed containing links to the composite and the contributions assigned to
// the node
Composite composite = null;
Contribution contribution = null;
boolean id = false;
QName name = null;
while (reader.hasNext()) {
int event = reader.getEventType();
switch (event) {
case START_ELEMENT:
name = reader.getName();
if (ENTRY_QNAME.equals(name)) {
// Read an <entry>
if (implementation.getComposite() == null) {
composite = assemblyFactory.createComposite();
} else {
contribution = contributionFactory.createContribution();
}
} else if (ID_QNAME.equals(name)) {
// Read an <id>
id = true;
} else if (LINK_QNAME.equals(name)) {
// Read a <link>
String href = getString(reader, HREF);
if (composite != null) {
composite.setURI(href);
} else if (contribution != null) {
contribution.setLocation(href);
}
}
break;
case XMLStreamConstants.CHARACTERS:
// Read characters inside an <id> element
if (id) {
if (contribution != null) {
contribution.setURI(reader.getText());
}
}
break;
case END_ELEMENT:
name = reader.getName();
// Clear current state when reading reaching end element
if (ENTRY_QNAME.equals(name)) {
if (composite != null) {
implementation.setComposite(composite);
} else if (contribution != null) {
implementation.getContributions().add(contribution);
}
composite = null;
contribution = null;
} else if (ID_QNAME.equals(name)) {
id = false;
} else if (FEED_QNAME.equals(name)) {
// We've reached the end of the feed
return implementation;
}
break;
}
// Read the next element
if (reader.hasNext()) {
reader.next();
}
}
return implementation;
}
public void resolve(ConfiguredNodeImplementation implementation, ModelResolver resolver) throws ContributionResolveException {
// Resolve the referenced composite
Composite composite = implementation.getComposite();
if (composite != null) {
composite = resolver.resolveModel(Composite.class, composite);
if (!composite.isUnresolved()) {
implementation.setComposite(composite);
}
}
// Resolve the referenced contributions
List<Contribution> contributions = implementation.getContributions();
for (int i = 0, n = contributions.size(); i < n; i++) {
Contribution contribution = contributions.get(i);
contribution = resolver.resolveModel(Contribution.class, contribution);
if (!contribution.isUnresolved()) {
contributions.set(i, contribution);
}
}
implementation.setUnresolved(false);
}
public void write(ConfiguredNodeImplementation implementation, XMLStreamWriter writer) throws ContributionWriteException, XMLStreamException {
//TODO Write the feed describing the node configuration
}
}
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