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The Waikato Environment for Knowledge Analysis (WEKA), a machine
learning workbench. This is the stable version. Apart from bugfixes, this version
does not receive any other updates.
/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see > m_Cache;
static {
// notify if VERBOSE is still on
if (VERBOSE) {
System.err.println(ClassCache.class.getName() + ": VERBOSE ON");
}
}
/**
* Initializes the cache.
*/
public ClassCache() {
super();
initialize();
}
/**
* Fixes the classname, turns "/" and "\" into "." and removes ".class".
*
* @param classname the classname to process
* @return the processed classname
*/
protected String cleanUp(String classname) {
String result;
result = classname;
if (result.indexOf("/") > -1) {
result = result.replace("/", ".");
}
if (result.indexOf("\\") > -1) {
result = result.replace("\\", ".");
}
if (result.endsWith(".class")) {
result = result.substring(0, result.length() - 6);
}
return result;
}
/**
* Extracts the package name from the (clean) classname.
*
* @param classname the classname to extract the package from
* @return the package name
*/
protected String extractPackage(String classname) {
if (classname.indexOf(".") > -1) {
return classname.substring(0, classname.lastIndexOf("."));
} else {
return DEFAULT_PACKAGE;
}
}
/**
* Adds the classname to the cache.
*
* @param classname the classname, automatically removes ".class" and turns
* "/" or "\" into "."
* @return true if adding changed the cache
*/
public boolean add(String classname) {
String pkgname;
HashSet names;
// classname and package
classname = cleanUp(classname);
pkgname = extractPackage(classname);
// add to cache
if (!m_Cache.containsKey(pkgname)) {
m_Cache.put(pkgname, new HashSet());
}
names = m_Cache.get(pkgname);
return names.add(classname);
}
/**
* Removes the classname from the cache.
*
* @param classname the classname to remove
* @return true if the removal changed the cache
*/
public boolean remove(String classname) {
String pkgname;
HashSet names;
classname = cleanUp(classname);
pkgname = extractPackage(classname);
names = m_Cache.get(pkgname);
if (names != null) {
return names.remove(classname);
} else {
return false;
}
}
/**
* Fills the class cache with classes in the specified directory.
*
* @param prefix the package prefix so far, null for default package
* @param dir the directory to search
*/
protected void initFromDir(String prefix, File dir) {
File[] files;
// check classes
files = dir.listFiles(new ClassFileFilter());
for (File file : files) {
if (prefix == null) {
add(file.getName());
} else {
add(prefix + "." + file.getName());
}
}
// descend in directories
files = dir.listFiles(new DirectoryFilter());
for (File file : files) {
if (prefix == null) {
initFromDir(file.getName(), file);
} else {
initFromDir(prefix + "." + file.getName(), file);
}
}
}
/**
* Fills the class cache with classes in the specified directory.
*
* @param dir the directory to search
*/
protected void initFromDir(File dir) {
if (VERBOSE) {
System.out.println("Analyzing directory: " + dir);
}
initFromDir(null, dir);
}
/**
* Analyzes the MANIFEST.MF file of a jar whether additional jars are listed
* in the "Class-Path" key.
*
* @param manifest the manifest to analyze
*/
protected void initFromManifest(Manifest manifest) {
if (manifest == null) {
return;
}
Attributes atts;
String cp;
String[] parts;
atts = manifest.getMainAttributes();
cp = atts.getValue("Class-Path");
if (cp == null) {
return;
}
parts = cp.split(" ");
for (String part : parts) {
if (part.trim().length() == 0) {
return;
}
if (part.toLowerCase().endsWith(".jar")) {
initFromClasspathPart(part);
}
}
}
/**
* Fills the class cache with classes from the specified jar.
*
* @param file the jar to inspect
*/
protected void initFromJar(File file) {
JarFile jar;
JarEntry entry;
Enumeration enm;
if (VERBOSE) {
System.out.println("Analyzing jar: " + file);
}
if (!file.exists()) {
System.out.println("Jar does not exist: " + file);
return;
}
try {
jar = new JarFile(file);
enm = jar.entries();
while (enm.hasMoreElements()) {
entry = enm.nextElement();
if (entry.getName().endsWith(".class")) {
add(entry.getName());
}
}
initFromManifest(jar.getManifest());
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Returns all the stored packages.
*
* @return the package names
*/
public Enumeration packages() {
return m_Cache.keys();
}
/**
* Returns all the classes for the given package.
*
* @param pkgname the package to get the classes for
* @return the classes (sorted by name)
*/
public HashSet getClassnames(String pkgname) {
if (m_Cache.containsKey(pkgname)) {
return m_Cache.get(pkgname);
} else {
return new HashSet();
}
}
/**
* Analyzes a part of the classpath.
*
* @param part the part to analyze
*/
protected void initFromClasspathPart(String part) {
File file;
file = null;
if (part.startsWith("file:")) {
part = part.replace(" ", "%20");
try {
file = new File(new java.net.URI(part));
} catch (URISyntaxException e) {
System.err.println("Failed to generate URI: " + part);
e.printStackTrace();
}
} else {
file = new File(part);
}
if (file == null) {
System.err.println("Skipping: " + part);
return;
}
// find classes
if (file.isDirectory()) {
initFromDir(file);
} else if (file.exists()) {
initFromJar(file);
}
}
/**
* Initializes the cache.
*/
protected void initialize() {
String part = "";
URLClassLoader sysLoader;
URL[] urls;
m_Cache = new Hashtable>();
sysLoader = (URLClassLoader) getClass().getClassLoader();
urls = sysLoader.getURLs();
for (URL url : urls) {
part = url.toString();
if (VERBOSE) {
System.out.println("Classpath-part: " + part);
}
initFromClasspathPart(part);
}
}
/**
* Find all classes that have the supplied matchText String in their suffix.
*
* @param matchText the text to match
* @return an array list of matching fully qualified class names.
*/
public ArrayList find(String matchText) {
ArrayList result;
Enumeration packages;
Iterator names;
String name;
result = new ArrayList();
packages = m_Cache.keys();
while (packages.hasMoreElements()) {
names = m_Cache.get(packages.nextElement()).iterator();
while (names.hasNext()) {
name = names.next();
if (name.contains(matchText)) {
result.add(name);
}
}
}
if (result.size() > 1) {
Collections.sort(result);
}
return result;
}
/**
* Returns the revision string.
*
* @return the revision
*/
@Override
public String getRevision() {
return RevisionUtils.extract("$Revision: 11597 $");
}
/**
* For testing only.
*
* @param args ignored
*/
public static void main(String[] args) {
ClassCache cache = new ClassCache();
Enumeration packages = cache.packages();
while (packages.hasMoreElements()) {
String key = packages.nextElement();
System.out.println(key + ": " + cache.getClassnames(key).size());
}
}
}