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/**
* 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.xbean.finder;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
/**
* ClassFinder searches the classpath of the specified classloader for
* packages, classes, constructors, methods, or fields with specific annotations.
*
* For security reasons ASM is used to find the annotations. Classes are not
* loaded unless they match the requirements of a called findAnnotated* method.
* Once loaded, these classes are cached.
*
* The getClassesNotLoaded() method can be used immediately after any find*
* method to get a list of classes which matched the find requirements (i.e.
* contained the annotation), but were unable to be loaded.
*
* @author David Blevins
* @version $Rev: 1778104 $ $Date: 2017-01-10 11:05:25 +0100 (Tue, 10 Jan 2017) $
*/
public class ClassFinder extends AbstractFinder {
private final ClassLoader classLoader;
/**
* Creates a ClassFinder that will search the urls in the specified classloader
* excluding the urls in the classloader's parent.
*
* To include the parent classloader, use:
*
* new ClassFinder(classLoader, false);
*
* To exclude the parent's parent, use:
*
* new ClassFinder(classLoader, classLoader.getParent().getParent());
*
* @param classLoader source of classes to scan
* @throws Exception if something goes wrong
*/
public ClassFinder(ClassLoader classLoader) throws Exception {
this(classLoader, true);
}
/**
* Creates a ClassFinder that will search the urls in the specified classloader.
*
* @param classLoader source of classes to scan
* @param excludeParent Allegedly excludes classes from parent classloader, whatever that might mean
* @throws Exception if something goes wrong.
*/
public ClassFinder(ClassLoader classLoader, boolean excludeParent) throws Exception {
this(classLoader, getUrls(classLoader, excludeParent));
}
/**
* Creates a ClassFinder that will search the urls in the specified classloader excluding
* the urls in the 'exclude' classloader.
*
* @param classLoader source of classes to scan
* @param exclude source of classes to exclude from scanning
* @throws Exception if something goes wrong
*/
public ClassFinder(ClassLoader classLoader, ClassLoader exclude) throws Exception {
this(classLoader, getUrls(classLoader, exclude));
}
public ClassFinder(ClassLoader classLoader, URL url) {
this(classLoader, Arrays.asList(url));
}
public ClassFinder(ClassLoader classLoader, Collection urls) {
this.classLoader = classLoader;
List classNames = new ArrayList();
for (URL location : urls) {
try {
if (location.getProtocol().equals("jar")) {
classNames.addAll(jar(location));
} else if (location.getProtocol().equals("file")) {
try {
// See if it's actually a jar
URL jarUrl = new URL("jar", "", location.toExternalForm() + "!/");
JarURLConnection juc = (JarURLConnection) jarUrl.openConnection();
juc.getJarFile();
classNames.addAll(jar(jarUrl));
} catch (IOException e) {
classNames.addAll(file(location));
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
for (String className : classNames) {
readClassDef(className);
}
}
public ClassFinder(Class... classes){
this(Arrays.asList(classes));
}
public ClassFinder(List> classes){
this.classLoader = null;
for (Class clazz : classes) {
try {
readClassDef(clazz);
} catch (NoClassDefFoundError e) {
throw new NoClassDefFoundError("Could not fully load class: " + clazz.getName() + "\n due to:" + e.getMessage() + "\n in classLoader: \n" + clazz.getClassLoader());
}
}
}
private static Collection getUrls(ClassLoader classLoader, boolean excludeParent) throws IOException {
return getUrls(classLoader, excludeParent? classLoader.getParent() : null);
}
private static Collection getUrls(ClassLoader classLoader, ClassLoader excludeParent) throws IOException {
UrlSet urlSet = new UrlSet(classLoader);
if (excludeParent != null){
urlSet = urlSet.exclude(excludeParent);
}
return urlSet.getUrls();
}
@Override
protected URL getResource(String className) {
return classLoader.getResource(className);
}
@Override
protected Class loadClass(String fixedName) throws ClassNotFoundException {
return classLoader.loadClass(fixedName);
}
private List file(URL location) {
List classNames = new ArrayList();
File dir = new File(URLDecoder.decode(location.getPath()));
if (dir.getName().equals("META-INF")) {
dir = dir.getParentFile(); // Scrape "META-INF" off
}
if (dir.isDirectory()) {
scanDir(dir, classNames, "");
}
return classNames;
}
private void scanDir(File dir, List classNames, String packageName) {
File[] files = dir.listFiles();
if (files == null) {
return;
}
for (File file : files) {
if (file.isDirectory()) {
scanDir(file, classNames, packageName + file.getName() + ".");
} else if (file.getName().endsWith(".class")) {
String name = file.getName();
name = name.replaceFirst(".class$", "");
if (name.contains(".")) continue;
classNames.add(packageName + name);
}
}
}
private List jar(URL location) throws IOException {
String jarPath = location.getFile();
if (jarPath.indexOf("!") > -1){
jarPath = jarPath.substring(0, jarPath.indexOf("!"));
}
URL url = new URL(jarPath);
InputStream in = url.openStream();
try {
JarInputStream jarStream = new JarInputStream(in);
return jar(jarStream);
} finally {
in.close();
}
}
private List jar(JarInputStream jarStream) throws IOException {
List classNames = new ArrayList();
JarEntry entry;
while ((entry = jarStream.getNextJarEntry()) != null) {
if (entry.isDirectory() || !entry.getName().endsWith(".class")) {
continue;
}
String className = entry.getName();
className = className.replaceFirst(".class$", "");
if (className.contains(".")) continue;
className = className.replace('/', '.');
classNames.add(className);
}
return classNames;
}
}
