/**
* Copyright 2010 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.ide.common.server.rules;
/*
* Copyright 2007 Mark Derricutt
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLDecoder;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
/**
* This is a utility to walk a tree of classes (recursively) and return a set
* of classes that match a package name.
*
* This is not currently used, as I can't work out a way to make it work including the dynamically added stuff into the MapBackedClassloader
* (ie classes added in memory only). It requires some more surgery to cope with this. Was worth a try though !
* (can be wired into the loadClass method of the SuggestionCompletionLoader).
*
* @author Mark Derricutt
* @author Michael Neale
*/
public class ClassWalker {
public static Set<Class> findClassesInPackage(String packageName, ClassLoader loader) {
Set<Class> acceptedClasses = new HashSet<Class>();
try {
String packageOnly = packageName;
boolean recursive = false;
if (packageName.endsWith(".*")) {
packageOnly = packageName.substring(0, packageName.lastIndexOf(".*"));
recursive = true;
}
String packageDirName = packageOnly.replace('.', '/');
Enumeration<URL> dirs = loader.getResources(packageDirName);
while (dirs.hasMoreElements()) {
URL url = dirs.nextElement();
if ("file".equals(url.getProtocol())) {
findClassesInDirPackage(packageOnly,
URLDecoder.decode(url.getFile(), "UTF-8"),
recursive, acceptedClasses, loader
);
} else if ("jar".equals(url.getProtocol())) {
JarFile jar = ((JarURLConnection) url.openConnection()).getJarFile();
Enumeration<JarEntry> entries = jar.entries();
while (entries.hasMoreElements()) {
JarEntry entry = entries.nextElement();
String name = entry.getName();
if (!name.endsWith("/")) {
String className = name.replaceAll("/", ".").replaceAll("\\.class", "");
checkValidClass(className, acceptedClasses, loader);
}
}
}
}
} catch (IOException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
return acceptedClasses;
}
private static void checkValidClass(String className, Set<Class> acceptedClasses, ClassLoader loader) {
try {
Class classClass = loader.loadClass(className);
acceptedClasses.add(classClass);
} catch (ClassNotFoundException e) {
// e.printStackTrace();
} catch (NoClassDefFoundError e) {
//
}
}
private static void findClassesInDirPackage(String packageName,
String packagePath,
final boolean recursive,
Set<Class> classes, ClassLoader loader) {
File dir = new File(packagePath);
if (!dir.exists() || !dir.isDirectory()) {
return;
}
File[] dirfiles = dir.listFiles(new FileFilter() {
public boolean accept(File file) {
return (recursive && file.isDirectory()) || (file.getName().endsWith(".class"));
}
});
for (File file : dirfiles) {
if (file.isDirectory()) {
findClassesInDirPackage(packageName + "." + file.getName(),
file.getAbsolutePath(),
recursive,
classes, loader);
} else {
String className = file.getName().substring(0, file.getName().length() - 6);
checkValidClass(packageName + "." + className, classes, loader);
}
}
}
}