//$Id: GroovyComponentScanner.java,v 1.2 2007/04/24 00:06:40 gavin Exp $
package org.jboss.seam.deployment;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLClassLoader;
import groovy.lang.GroovyClassLoader;
import groovy.lang.GroovyRuntimeException;
import org.codehaus.groovy.control.CompilationFailedException;
import org.jboss.seam.annotations.Install;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.log.LogProvider;
import org.jboss.seam.log.Logging;
/**
* Scan Groovy files as well as Java files
* <p/>
* TODO: make it so that you can plug any Scripting scanner
*
* @author Emmanuel Bernard
*/
public class GroovyComponentScanner extends ComponentScanner
{
private static final LogProvider log = Logging.getLogProvider(GroovyComponentScanner.class);
private final String groovyFileExtension;
public GroovyComponentScanner(String resourceName, String groovyFileExtension)
{
super(resourceName);
this.groovyFileExtension = groovyFileExtension;
}
//has to be a GroovyClassLoader see #getURLsFromClassLoader
public GroovyComponentScanner(String resourceName, GroovyClassLoader classLoader, String groovyFileExtension)
{
super(resourceName, classLoader);
this.groovyFileExtension = groovyFileExtension;
}
@Override
protected URL[] getURLsFromClassLoader()
{
/*
* a GroovyClassLoader accept no URL,
* use the parent URL
*/
return ( (URLClassLoader) classLoader.getParent() ).getURLs();
}
@Override
protected void handleItem(String name)
{
//handle java classes
super.handleItem(name);
if (name.endsWith(groovyFileExtension))
{
log.debug("Found a groovy file: " + name);
String classname = filenameToGroovyname(name);
String filename = groovyComponentFilename(name);
BufferedReader buffReader = null;
try
{
InputStream stream = classLoader.getResourceAsStream(name);
//TODO is BufferedInputStream necessary?
buffReader = new BufferedReader(new InputStreamReader(stream));
String line = buffReader.readLine();
while (line != null)
{
if (line.indexOf("@Name") != -1 || line.indexOf("@" + Name.class.getName()) != -1)
{
//possibly a Seam component
log.debug("Groovy file possibly a Seam component: " + name);
Class<Object> groovyClass = (Class<Object>) classLoader.loadClass(classname);
Install install = groovyClass.getAnnotation(Install.class);
boolean installable = ( install == null || install.value() )
&& ( groovyClass.isAnnotationPresent(Name.class)
|| classLoader.getResources(filename).hasMoreElements() );
if (installable)
{
log.debug("found groovy component class: " + name);
classes.add(groovyClass);
}
break;
}
line = buffReader.readLine();
}
}
catch (ClassNotFoundException cnfe)
{
log.debug("could not load groovy class: " + classname, cnfe);
}
catch (NoClassDefFoundError ncdfe)
{
log.debug("could not load groovy class (missing dependency): " + classname, ncdfe);
}
catch (IOException ioe)
{
log.debug("could not load groovy file: " + classname, ioe);
}
catch( CompilationFailedException e) {
log.info("Compilation error in Groovy file:" + classname, e);
}
catch(GroovyRuntimeException e) {
log.info("Unknown error reading Groovy file:" + classname, e);
}
finally
{
if (buffReader != null) {
try
{
buffReader.close();
}
catch (IOException e)
{
log.trace("Could not close stream");
}
}
}
}
}
public String filenameToGroovyname(String filename)
{
return filename.substring(0, filename.lastIndexOf(groovyFileExtension))
.replace('/', '.').replace('\\', '.');
}
public String groovyComponentFilename(String name)
{
return name.substring(0, name.lastIndexOf(groovyFileExtension)) + ".component.xml";
}
}