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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.definitions.xml;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor;
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.definitions.SCADefinitions;
import org.apache.tuscany.sca.definitions.impl.SCADefinitionsImpl;
import org.apache.tuscany.sca.definitions.util.SCADefinitionsUtil;
import org.apache.tuscany.sca.monitor.Monitor;
import org.apache.tuscany.sca.monitor.Problem;
import org.apache.tuscany.sca.monitor.Problem.Severity;
import org.apache.tuscany.sca.monitor.impl.ProblemImpl;
/**
* A SCA Definitions Document processor.
*
* @version $Rev$ $Date$
*/
public class SCADefinitionsDocumentProcessor implements URLArtifactProcessor<SCADefinitions> {
private StAXArtifactProcessor<Object> extensionProcessor;
private XMLInputFactory inputFactory;
private static final String TUSCANY_NS = "http://tuscany.apache.org/xmlns/sca/1.0";
private static final String DEFINITIONS = "definitions";
private static final QName DEFINITIONS_QNAME = new QName(TUSCANY_NS, DEFINITIONS);
private Monitor monitor;
/**
* Construct a new SCADefinitions processor
* @param assemblyFactory
* @param policyFactory
* @param staxProcessor
*/
public SCADefinitionsDocumentProcessor(StAXArtifactProcessor<Object> staxProcessor,
XMLInputFactory inputFactory,
Monitor monitor) {
this.extensionProcessor = (StAXArtifactProcessor<Object>)staxProcessor;
this.inputFactory = inputFactory;
this.monitor = monitor;
}
/**
* Constructs a new SCADefinitions processor.
*
* @param modelFactories
* @param staxProcessor
*/
public SCADefinitionsDocumentProcessor(ModelFactoryExtensionPoint modelFactories,
StAXArtifactProcessor<Object> staxProcessor,
Monitor monitor) {
this.extensionProcessor = (StAXArtifactProcessor<Object>)staxProcessor;
this.inputFactory = modelFactories.getFactory(XMLInputFactory.class);
this.monitor = monitor;
}
/**
* 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(), "definitions-xml-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(), "definitions-xml-validation-messages", Severity.ERROR, model, message, ex);
monitor.problem(problem);
}
}
public SCADefinitions read(URL contributionURL, final URI uri, final URL url) throws ContributionReadException {
InputStream urlStream = null;
try {
// Allow privileged access to open URL stream. Add FilePermission to added to security
// policy file.
try {
urlStream = AccessController.doPrivileged(new PrivilegedExceptionAction<InputStream>() {
public InputStream run() throws IOException {
URLConnection connection = url.openConnection();
connection.setUseCaches(false);
return connection.getInputStream();
}
});
} catch (PrivilegedActionException e) {
error("PrivilegedActionException", url, (IOException)e.getException());
throw (IOException)e.getException();
}
//urlStream = createInputStream(url);
XMLStreamReader reader = inputFactory.createXMLStreamReader(url.toString(), urlStream);
SCADefinitions definitions = new SCADefinitionsImpl();
QName name = null;
int event;
while ( reader.hasNext() ) {
event = reader.next();
if ( event == XMLStreamConstants.START_ELEMENT ||
event == XMLStreamConstants.END_ELEMENT ) {
name = reader.getName();
if ( name.equals(DEFINITIONS_QNAME) ) {
if ( event == XMLStreamConstants.END_ELEMENT ) {
return definitions;
}
} else {
SCADefinitions aDefn = (SCADefinitions)extensionProcessor.read(reader);
SCADefinitionsUtil.aggregateSCADefinitions(aDefn, definitions);
}
}
}
return definitions;
} catch (XMLStreamException e) {
ContributionReadException ce = new ContributionReadException(e);
error("ContributionReadException", inputFactory, ce);
throw ce;
} catch (IOException e) {
ContributionReadException ce = new ContributionReadException(e);
error("ContributionReadException", inputFactory, ce);
throw ce;
} finally {
try {
if (urlStream != null) {
urlStream.close();
urlStream = null;
}
} catch (IOException ioe) {
//ignore
}
}
}
public void resolve(SCADefinitions scaDefinitions, ModelResolver resolver) throws ContributionResolveException {
SCADefinitionsUtil.stripDuplicates(scaDefinitions);
extensionProcessor.resolve(scaDefinitions, resolver);
}
public String getArtifactType() {
return "definitions.xml";
}
public Class<SCADefinitions> getModelType() {
return SCADefinitions.class;
}
}
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