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/*
* The MIT License
*
* Copyright (c) 2010 The Broad Institute
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package picard.cmdline;
import htsjdk.samtools.util.Log;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* Utility class that can scan for classes in the classpath and find all the ones
* annotated with a particular annotation.
*
* @author Tim Fennell
*/
public class ClassFinder {
private final Set> classes = new HashSet>();
private final ClassLoader loader;
private Class parentType;
// If not null, only look for classes in this jar
private String jarPath = null;
private static final Log log = Log.getInstance(ClassFinder.class);
public ClassFinder() {
loader = Thread.currentThread().getContextClassLoader();
}
public ClassFinder(final ClassLoader loader) {
this.loader = loader;
}
public ClassFinder(final File jarFile) throws IOException {
// The class loader must have the context in order to load dependent classes when loading a class,
// but the jarPath is remembered so that the iteration over the classpath skips anything other than
// the jarPath.
jarPath = jarFile.getCanonicalPath();
final URL[] urls = {new File(jarPath).toURI().toURL()};
loader = new URLClassLoader(urls, Thread.currentThread().getContextClassLoader());
}
/** Convert a filename to a class name by removing '.class' and converting '/'s to '.'s. */
public String toClassName(final String filename) {
return filename.substring(0, filename.lastIndexOf(".class"))
.replace('/', '.').replace('\\', '.');
}
/**
* Scans the classpath for classes within the specified package and sub-packages that
* extend the parentType. This method can be called repeatedly
* with different packages. Classes are accumulated internally and
* can be accessed by calling {@link #getClasses()}.
*/
public void find(String packageName, final Class parentType) {
this.parentType = parentType;
packageName = packageName.replace('.', '/');
final Enumeration urls;
try {
urls = loader.getResources(packageName);
}
catch (IOException ioe) {
log.warn("Could not read package: " + packageName, ioe);
return;
}
while (urls.hasMoreElements()) {
try {
String urlPath = urls.nextElement().getFile();
// convert URL to URI
// http://bugs.java.com/bugdatabase/view_bug.do?bug_id=4466485
// using URLDecode does not work if urlPath has a '+' character
try {
URI uri = new URI(urlPath);
urlPath = uri.getPath();
} catch (URISyntaxException e) {
log.warn("Cannot convert to URI the " + urlPath + " URL");
}
if (urlPath.indexOf('!') > 0) {
urlPath = urlPath.substring(0, urlPath.indexOf('!'));
}
if (jarPath != null && !jarPath.equals(urlPath)) {
continue;
}
//Log.info("Looking for classes in location: " + urlPath);
final File file = new File(urlPath);
if ( file.isDirectory() ) {
scanDir(file, packageName);
}
else {
scanJar(file, packageName);
}
}
catch (IOException ioe) {
log.warn("could not read entries", ioe);
}
}
}
/**
* Scans the entries in a ZIP/JAR file for classes under the parent package.
* @param file the jar file to be scanned
* @param packagePath the top level package to start from
*/
protected void scanJar(final File file, final String packagePath) throws IOException {
final ZipFile zip = new ZipFile(file);
final Enumeration entries = zip.entries();
while ( entries.hasMoreElements() ) {
final ZipEntry entry = entries.nextElement();
final String name = entry.getName();
if (name.startsWith(packagePath)) {
handleItem(name);
}
}
}
/**
* Scans a directory on the filesystem for classes.
* @param file the directory or file to examine
* @param path the package path acculmulated so far (e.g. edu/mit/broad)
*/
protected void scanDir(final File file, final String path) {
for ( final File child: file.listFiles() ) {
final String newPath = (path==null ? child.getName() : path + '/' + child.getName() );
if ( child.isDirectory() ) {
scanDir(child, newPath);
}
else {
handleItem(newPath);
}
}
}
/**
* Checks an item to see if it is a class and is annotated with the specified
* annotation. If so, adds it to the set, otherwise ignores it.
* @param name the path equivelant to the package + class/item name
*/
protected void handleItem(final String name) {
if (name.endsWith(".class")) {
final String classname = toClassName(name);
try {
final Class type = loader.loadClass(classname);
if (parentType.isAssignableFrom(type)) {
this.classes.add(type);
}
}
catch (Throwable t) {
log.debug("could not load class: " + classname, t);
}
}
}
/** Fetches the set of classes discovered so far. */
public Set> getClasses() {
return this.classes;
}
}
