package org.jboss.arquillian.persistence.core.configuration;
import java.io.InputStream;
import java.util.Collection;
import java.util.LinkedList;
import java.util.Map;
import org.jboss.arquillian.container.test.api.Testable;
import org.jboss.shrinkwrap.api.Archive;
import org.jboss.shrinkwrap.api.ArchivePath;
import org.jboss.shrinkwrap.api.Filters;
import org.jboss.shrinkwrap.api.GenericArchive;
import org.jboss.shrinkwrap.api.Node;
import org.jboss.shrinkwrap.api.asset.ArchiveAsset;
public class PersistenceDescriptorArchiveExtractor
{
private static final String WAR_AND_JAR = ".*\\.war|.*\\.jar";
/**
* Returns open stream of persistence.xml found in the archive, but
* only if single file have been found.
*
* @param archive
* @return Input stream of persistence.xml found or null if zero or multiple found in the archive.
*/
public InputStream getAsStream(final Archive<?> archive)
{
final Archive<?> testable = findTestableArchive(archive);
final Collection<Node> values = collectPersistenceXml(testable);
if (values.size() == 1)
{
return values.iterator().next().getAsset().openStream();
}
return null;
}
/**
* Inspects archive in order to find nested testable archive, assuming
* @param archive
* @return testable archive or passed one if nothing found
*/
private Archive<?> findTestableArchive(final Archive<?> archive)
{
final Map<ArchivePath, Node> nestedArchives = archive.getContent(Filters.include(WAR_AND_JAR));
if (!nestedArchives.isEmpty())
{
for (ArchivePath path : nestedArchives.keySet())
{
try
{
GenericArchive genericArchive = archive.getAsType(GenericArchive.class, path);
if (Testable.isArchiveToTest(genericArchive))
{
return genericArchive;
}
}
catch (IllegalArgumentException e)
{
// no-op, Nested archive is not a ShrinkWrap archive.
}
}
}
return archive;
}
/**
* Recursively scans archive content (including sub archives) for persistence.xml descriptors.
*
* @param archive
* @return
*/
private Collection<Node> collectPersistenceXml(final Archive<?> archive)
{
final Collection<Node> nodes = new LinkedList<Node>(getPersistenceDescriptors(archive));
for (Node node : collectSubArchives(archive))
{
if (node.getAsset() instanceof ArchiveAsset)
{
final ArchiveAsset archiveAsset = (ArchiveAsset) node.getAsset();
nodes.addAll(collectPersistenceXml(archiveAsset.getArchive()));
}
}
return nodes;
}
private Collection<Node> getPersistenceDescriptors(final Archive<?> archive)
{
return archive.getContent(Filters.include(".*persistence.xml")).values();
}
private Collection<Node> collectSubArchives(final Archive<?> archive)
{
return archive.getContent(Filters.include(WAR_AND_JAR)).values();
}
}