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package org.glassfish.hk2.utilities;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import org.glassfish.hk2.api.DescriptorFileFinder;
/**
* This is an implementation of {@link DescriptorFileFinder} that
* uses a particular classloader in order to find descriptor files.
* @author jwells
*
*/
public class ClasspathDescriptorFileFinder implements DescriptorFileFinder {
private final static String DEFAULT_NAME = "default";
private final ClassLoader classLoader;
private final String name;
/**
* If this constructor is used then HK2 descriptor files will be found
* by looking in the classpath of the process. The classloader used
* will be the classloader for this class itself. The names of
* the files found will be META-INF/hk2-locator/default.
*
* This is most commonly used when using HK2 from a stand-alone client in
* which all the JAR files are on a single classpath
*/
public ClasspathDescriptorFileFinder() {
this(ClasspathDescriptorFileFinder.class.getClassLoader());
}
/**
* This constructor can be used to select the particular classloader
* to search for HK2 descriptor files. The names of the the files
* found in this classloader will be META-INF/hk2-locator/default.
*
* This is commonly used in more complex classloading scenarios where
* the HK2 descriptor files are not necessarily on the system classpath.
*
* @param cl May not be null and must be the classloader to use when
* searching for HK2 descriptor files
*/
public ClasspathDescriptorFileFinder (ClassLoader cl) {
this(cl, DEFAULT_NAME);
}
/**
* This constructor can be used to select the particular classloader
* to search for HK2 descriptor files. The names of the the files
* found in this classloader will be META-INF/hk2-locator/name.
*
* @param cl May not be null and must be the classloader to use when
* searching for HK2 descriptor files
* @param name Maynot be null and must be the name of the files to
* search for in the META-INF/hk2-locator directory
*/
public ClasspathDescriptorFileFinder (ClassLoader cl, String name) {
this.classLoader = cl;
this.name = name;
}
/**
* Simple implementation of the findDescriptorFiles which does a
* simple getResources on the classloader in order to find the
* hk2 descriptor files
*/
@Override
public List findDescriptorFiles() throws IOException {
ArrayList returnList = new ArrayList();
Enumeration e = classLoader.getResources(RESOURCE_BASE+name);
for (; e.hasMoreElements();) {
URL url = e.nextElement();
returnList.add(url.openStream());
}
return returnList;
}
public String toString() {
return "ClasspathDescriptorFileFinder(" + classLoader + "," + name + "," + System.identityHashCode(this) + ")";
}
}