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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.contribution.service.impl;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.apache.tuscany.sca.assembly.AssemblyFactory;
import org.apache.tuscany.sca.contribution.Contribution;
import org.apache.tuscany.sca.contribution.ContributionFactory;
import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
import org.apache.tuscany.sca.contribution.service.ContributionReadException;
/**
* MetadataDocumentProcessor that handles contribution metadata files
*
* @version $Rev$ $Date$
*/
public class ContributionMetadataDocumentProcessor {
protected final URLClassLoader classLoader;
protected final StAXArtifactProcessor staxProcessor;
protected final AssemblyFactory assemblyFactory;
protected final ContributionFactory contributionFactory;
protected final XMLInputFactory inputFactory;
public ContributionMetadataDocumentProcessor(URLClassLoader classLoader, StAXArtifactProcessor staxProcessor, AssemblyFactory assemblyFactory, ContributionFactory contributionFactory, XMLInputFactory inputFactory) {
super();
this.classLoader = classLoader;
this.staxProcessor = staxProcessor;
this.assemblyFactory = assemblyFactory;
this.contributionFactory = contributionFactory;
this.inputFactory = inputFactory;
}
private Contribution mergeContributionMetadata(Contribution contrib1, Contribution contrib2 ) {
contrib1.getDeployables().addAll(contrib2.getDeployables());
contrib1.getImports().addAll(contrib2.getImports());
contrib1.getExports().addAll(contrib2.getExports());
return contrib1;
}
public void read(Contribution contribution) throws XMLStreamException, ContributionReadException {
List<URL> artifactList = new ArrayList<URL>(2);
//set generated first, as the user created one ovverrides generated information
artifactList.add(this.classLoader.getResource(Contribution.SCA_CONTRIBUTION_GENERATED_META));
artifactList.add(this.classLoader.getResource(Contribution.SCA_CONTRIBUTION_META));
URL artifactURL = null;
InputStream artifactStream = null;
Iterator artifactIterator = artifactList.iterator();
while( artifactIterator.hasNext() ){
try {
artifactURL = (URL) artifactIterator.next();
if( artifactURL != null) {
artifactStream = artifactURL.openStream();
XMLStreamReader reader = inputFactory.createXMLStreamReader(artifactStream);
reader.nextTag();
Contribution contributionMetadata = (Contribution) staxProcessor.read(reader);
if (contributionMetadata != null) {
this.mergeContributionMetadata(contribution, contributionMetadata);
}
}
} catch (XMLStreamException e) {
throw new ContributionReadException(e);
} catch (IOException e) {
throw new ContributionReadException(e);
} finally {
try {
if (artifactStream != null) {
artifactStream.close();
artifactStream = null;
}
} catch (IOException ioe) {
//ignore
}
}
}
}
}
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