/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.synapse.maven.xar;
import java.io.File;
import java.io.FileFilter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
public class ClassScanner {
private final File dir;
private List<File> classpath = new LinkedList<File>();
private List<ClassVisitor> visitors = new LinkedList<ClassVisitor>();
private ClassLoader loader;
public ClassScanner(File dir) {
this.dir = dir;
addToClasspath(dir);
}
public void addToClasspath(File file) {
classpath.add(file);
}
public void addVisitor(ClassVisitor visitor) {
visitors.add(visitor);
}
public void scan() throws ClassScannerException {
if (visitors.isEmpty()) {
return;
}
List<URL> urls = new ArrayList<URL>(classpath.size());
for (File classpathEntry : classpath) {
try {
urls.add(classpathEntry.toURL());
} catch (MalformedURLException e) {
throw new ClassScannerException("Unable to build classpath", e);
}
}
loader = URLClassLoader.newInstance(urls.toArray(new URL[urls.size()]));
try {
for (ClassVisitor visitor : visitors) {
visitor.init(loader);
}
scan(dir, null);
} finally {
loader = null;
}
}
private void scan(File dir, String packageName) throws ClassScannerException {
File[] children = dir.listFiles(new FileFilter() {
public boolean accept(File file) {
return file.isDirectory() || (file.isFile() && file.getName().endsWith(".class"));
}
});
for (File child : children) {
String name = child.getName();
if (child.isDirectory()) {
scan(child, packageName == null ? name : packageName + "." + name);
} else {
StringBuilder className = new StringBuilder();
if (packageName != null) {
className.append(packageName).append('.');
}
className.append(name.substring(0, name.length()-6));
Class<?> clazz;
try {
clazz = loader.loadClass(className.toString());
} catch (ClassNotFoundException e) {
throw new ClassScannerException("Unable to load class " + className, e);
}
for (ClassVisitor visitor : visitors) {
visitor.visit(clazz);
}
}
}
}
}