leosutic 2003/08/11 17:09:18
Modified: attributes/api/src/java/org/apache/avalon/attributes
Attributes.java
Added: attributes/api/src/java/org/apache/avalon/attributes
URLClassLoaderScanner.java ClassLoaderUtil.java
ClassLoaderScanner.java
Log:
Added code for scanning ClassLoaders and finding out what classes can be
loaded from them. Also added a convenience function that will select from
a Collection of Classes only those Classes that have an attribute with a
certain class.
Revision Changes Path
1.6 +13 -0
avalon-sandbox/attributes/api/src/java/org/apache/avalon/attributes/Attributes.java
Index: Attributes.java
===================================================================
RCS file:
/home/cvs/avalon-sandbox/attributes/api/src/java/org/apache/avalon/attributes/Attributes.java,v
retrieving revision 1.5
retrieving revision 1.6
diff -u -r1.5 -r1.6
--- Attributes.java 11 Aug 2003 00:20:05 -0000 1.5
+++ Attributes.java 12 Aug 2003 00:09:18 -0000 1.6
@@ -151,6 +151,19 @@
return getAttributes (getAttributes (method), attributeClass);
}
+ public static Collection getClassesWithAttributeType (Collection classes, Class
attributeClass) {
+ ArrayList result = new ArrayList ();
+ Iterator iter = classes.iterator ();
+ while (iter.hasNext ()) {
+ Class clazz = (Class) iter.next ();
+ if (hasAttributeType (clazz, attributeClass)) {
+ result.add (clazz);
+ }
+ }
+
+ return result;
+ }
+
/**
* Convenience function to test whether a collection of attributes contain
* an attribute of a given class.
1.1
avalon-sandbox/attributes/api/src/java/org/apache/avalon/attributes/URLClassLoaderScanner.java
Index: URLClassLoaderScanner.java
===================================================================
package org.apache.avalon.attributes;
import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Collection;
import java.util.jar.JarFile;
import java.util.jar.JarEntry;
public class URLClassLoaderScanner implements ClassLoaderScanner {
public Class getClassLoaderClass () {
return URLClassLoader.class;
}
private Collection getAllClassesFromJarFile (ClassLoader cl, JarFile jar) throws
Exception {
HashSet result = new HashSet ();
Enumeration enum = jar.entries ();
while (enum.hasMoreElements ()) {
JarEntry entry = (JarEntry) enum.nextElement ();
if (!entry.isDirectory ()) {
String className = entry.getName ();
if (className.endsWith (".class")) {
className = className.substring (0, className.length () - 6);
className.replace ('/', '.').replace ('\\', '.').replace (':',
'.');
try {
Class clazz = cl.loadClass (className);
result.add (clazz);
} catch (Exception e) {
}
}
}
}
return result;
}
private Collection getAllClassesFromDirectory (ClassLoader cl, File dir, String
prefix) throws Exception {
HashSet result = new HashSet ();
File[] files = dir.listFiles ();
for (int i = 0; i < files.length; i++) {
if (files[i].isDirectory ()) {
String newPrefix = prefix.equals ("") ? (files[i].getName () + ".")
: (prefix + files[i].getName () + ".");
result.addAll (getAllClassesFromDirectory (cl, files[i], newPrefix));
} else if (files[i].getName ().endsWith (".class")) {
String className = prefix + files[i].getName ().substring (0,
files[i].getName ().length () - 6);
try {
Class clazz = cl.loadClass (className);
result.add (clazz);
} catch (Exception e) {
}
}
}
return result;
}
private Collection getAllClassesFromDirectory (ClassLoader cl, File dir) throws
Exception {
return getAllClassesFromDirectory (cl, dir, "");
}
private Collection getAllClasses (ClassLoader cl, URL url) throws Exception {
if ("file".equals (url.getProtocol ())) {
File f = new File (url.getPath ());
if (f.exists ()) {
if (f.isDirectory ()) {
return getAllClassesFromDirectory (cl, f);
} else {
return getAllClassesFromJarFile (cl, new JarFile (f));
}
} else {
return new ArrayList (0);
}
} else {
return new ArrayList (0);
}
}
public Collection getClasses (ClassLoader cl) {
URLClassLoader classLoader = (URLClassLoader) cl;
URL[] sourceURLs = classLoader.getURLs ();
HashSet result = new HashSet ();
try {
for (int i = 0; i < sourceURLs.length; i++) {
result.addAll (getAllClasses (classLoader, sourceURLs[i]));
}
} catch (Exception e) {
}
return result;
}
}
1.1
avalon-sandbox/attributes/api/src/java/org/apache/avalon/attributes/ClassLoaderUtil.java
Index: ClassLoaderUtil.java
===================================================================
package org.apache.avalon.attributes;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
public class ClassLoaderUtil {
private final static ClassLoaderUtil classLoaderUtil = new ClassLoaderUtil ();
static {
classLoaderUtil.addClassLoaderScanner (new URLClassLoaderScanner ());
}
private Map classLoaderScanners = new HashMap ();
public static ClassLoaderUtil getClassLoaderUtil () {
return classLoaderUtil;
}
public void addClassLoaderScanner (ClassLoaderScanner scanner) {
classLoaderScanners.put (scanner.getClassLoaderClass (), scanner);
}
public Collection getClasses (ClassLoader cl) {
ClassLoaderScanner scanner = (ClassLoaderScanner) classLoaderScanners.get
(cl.getClass ());
if (scanner != null) {
return scanner.getClasses (cl);
} else {
throw new UnsupportedOperationException ("No ClassLoaderScanner for
ClassLoader of type " +
cl.getClass ().getName ());
}
}
}
1.1
avalon-sandbox/attributes/api/src/java/org/apache/avalon/attributes/ClassLoaderScanner.java
Index: ClassLoaderScanner.java
===================================================================
package org.apache.avalon.attributes;
import java.util.Collection;
public interface ClassLoaderScanner {
public Class getClassLoaderClass ();
public Collection getClasses (ClassLoader cl);
}
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