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package org.jvnet.hk2.component.classmodel;
import java.io.IOException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collection;
import java.util.Collections;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.hk2.classmodel.reflect.ParsingContext;
import org.jvnet.hk2.component.Habitat;
import com.sun.hk2.component.Holder;
import com.sun.hk2.component.InhabitantIntrospectionScanner;
import com.sun.hk2.component.InhabitantsParser;
import com.sun.hk2.component.InhabitantsScanner;
import com.sun.hk2.component.IntrospectionScanner;
/**
* Responsible for feeding inhabitants into a habitat, thru the
* provided {@link InhabitantsParser}.
*
* @author Jerome Dochez
* @author Jeff Trent
* @since 3.1
*/
public abstract class InhabitantsFeed {
private final Logger logger = Logger.getLogger(InhabitantsFeed.class.getName());
private final InhabitantsParser ip;
private Holder<ClassLoader> classLoaderHolder;
/**
* Creates an InhabitantsHabitatFeed.
*
* @param h reserved for future use
* @param ip the inhabitants parser sync target
* @return the InhabitantsHabitatFeed
*/
public static InhabitantsFeed create(Habitat h, InhabitantsParser ip) {
return new InhabitantsFeed(ip) {
};
}
protected InhabitantsFeed(InhabitantsParser ip) {
this.ip = ip;
if (System.getSecurityManager()!=null) {
AccessController.doPrivileged(new PrivilegedAction<Void>() {
@Override
public Void run() {
setClassLoaderContext(getClass().getClassLoader());
return null;
}
});
} else {
setClassLoaderContext(getClass().getClassLoader());
}
}
public void setClassLoaderContext(ClassLoader cl) {
classLoaderHolder = new Holder.Impl<ClassLoader>(cl);
}
public void populate(InhabitantsParsingContextGenerator ipcgen) {
logger.log(Level.FINER, "Starting to introspect");
ParsingContext context = ipcgen.getContext();
InhabitantIntrospectionScanner is = new InhabitantIntrospectionScanner(context);
try {
ip.parse(is, classLoaderHolder);
} catch (IOException e) {
throw new RuntimeException(e);
}
logger.log(Level.FINER, "finished introspecting");
logger.log(Level.FINER, "Starting to introspect");
Collection<InhabitantsScanner> metaInfScanners = ipcgen.getInhabitantsScanners();
for (InhabitantsScanner scanner : metaInfScanners) {
try {
ip.parse(scanner, classLoaderHolder);
scanner.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
logger.log(Level.FINER, "finished introspecting");
for (IntrospectionScanner s : getIntrospectionScanners()) {
logger.log(Level.FINE, "parsing with supplemental scanner {0}", s);
s.parse(context, classLoaderHolder);
}
}
@SuppressWarnings("unchecked")
protected Collection<IntrospectionScanner> getIntrospectionScanners() {
if (null == ip.habitat) {
return Collections.EMPTY_LIST;
}
return ip.habitat.getAllByContract(IntrospectionScanner.class);
}
}