/*
* 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 java.net;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FilePermission;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.CodeSource;
import java.security.PermissionCollection;
import java.security.PrivilegedAction;
import java.security.SecureClassLoader;
import java.security.cert.Certificate;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import org.apache.harmony.luni.util.Msg;
/**
* This class loader is responsible for loading classes and resources from a
* list of URLs which can refer to either directories or JAR files. Classes
* loaded by this {@code URLClassLoader} are granted permission to access the
* URLs contained in the URL search list.
*/
public class URLClassLoader extends SecureClassLoader {
ArrayList<URL> originalUrls;
List<URL> searchList;
ArrayList<URLHandler> handlerList;
Map<URL, URLHandler> handlerMap = new HashMap<URL, URLHandler>();
private URLStreamHandlerFactory factory;
private AccessControlContext currentContext;
static class SubURLClassLoader extends URLClassLoader {
// The subclass that overwrites the loadClass() method
private boolean checkingPackageAccess = false;
SubURLClassLoader(URL[] urls) {
super(urls, ClassLoader.getSystemClassLoader());
}
SubURLClassLoader(URL[] urls, ClassLoader parent) {
super(urls, parent);
}
/**
* Overrides the {@code loadClass()} of {@code ClassLoader}. It calls
* the security manager's {@code checkPackageAccess()} before
* attempting to load the class.
*
* @return the Class object.
* @param className
* String the name of the class to search for.
* @param resolveClass
* boolean indicates if class should be resolved after
* loading.
* @throws ClassNotFoundException
* If the class could not be found.
*/
@Override
protected synchronized Class<?> loadClass(String className,
boolean resolveClass) throws ClassNotFoundException {
SecurityManager sm = System.getSecurityManager();
if (sm != null && !checkingPackageAccess) {
int index = className.lastIndexOf('.');
if (index > 0) { // skip if class is from a default package
try {
checkingPackageAccess = true;
sm.checkPackageAccess(className.substring(0, index));
} finally {
checkingPackageAccess = false;
}
}
}
return super.loadClass(className, resolveClass);
}
}
static class IndexFile {
private HashMap<String, ArrayList<URL>> map;
//private URLClassLoader host;
static IndexFile readIndexFile(JarFile jf, JarEntry indexEntry, URL url) {
BufferedReader in = null;
InputStream is = null;
try {
// Add mappings from resource to jar file
String parentURLString = getParentURL(url).toExternalForm();
String prefix = "jar:" //$NON-NLS-1$
+ parentURLString + "/"; //$NON-NLS-1$
is = jf.getInputStream(indexEntry);
in = new BufferedReader(new InputStreamReader(is, "UTF8"));
HashMap<String, ArrayList<URL>> pre_map = new HashMap<String, ArrayList<URL>>();
// Ignore the 2 first lines (index version)
if (in.readLine() == null) return null;
if (in.readLine() == null) return null;
TOP_CYCLE:
while (true) {
String line = in.readLine();
if (line == null) {
break;
}
URL jar = new URL(prefix + line + "!/"); //$NON-NLS-1$
while (true) {
line = in.readLine();
if (line == null) {
break TOP_CYCLE;
}
if ("".equals(line)) {
break;
}
ArrayList<URL> list;
if (pre_map.containsKey(line)) {
list = pre_map.get(line);
} else {
list = new ArrayList<URL>();
pre_map.put(line, list);
}
list.add(jar);
}
}
if (!pre_map.isEmpty()) {
return new IndexFile(pre_map);
}
} catch (MalformedURLException e) {
// Ignore this jar's index
} catch (IOException e) {
// Ignore this jar's index
}
finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
}
}
if (is != null) {
try {
is.close();
} catch (IOException e) {
}
}
}
return null;
}
private static URL getParentURL(URL url) throws IOException {
URL fileURL = ((JarURLConnection) url.openConnection()).getJarFileURL();
String file = fileURL.getFile();
String parentFile = new File(file).getParent();
parentFile = parentFile.replace(File.separatorChar, '/');
if (parentFile.charAt(0) != '/') {
parentFile = "/" + parentFile; //$NON-NLS-1$
}
URL parentURL = new URL(fileURL.getProtocol(), fileURL
.getHost(), fileURL.getPort(), parentFile);
return parentURL;
}
public IndexFile(HashMap<String, ArrayList<URL>> map) {
this.map = map;
}
ArrayList<URL> get(String name) {
return map.get(name);
}
}
class URLHandler {
URL url;
URL codeSourceUrl;
public URLHandler(URL url) {
this.url = url;
this.codeSourceUrl = url;
}
void findResources(String name, ArrayList<URL> resources) {
URL res = findResource(name);
if (res != null && !resources.contains(res)) {
resources.add(res);
}
}
Class<?> findClass(String packageName, String name, String origName) {
URL resURL = targetURL(url, name);
if (resURL != null) {
try {
InputStream is = resURL.openStream();
return createClass(is, packageName, origName);
} catch (IOException e) {
}
}
return null;
}
Class<?> createClass(InputStream is, String packageName, String origName) {
if (is == null) {
return null;
}
byte[] clBuf = null;
try {
clBuf = getBytes(is);
} catch (IOException e) {
return null;
} finally {
try {
is.close();
} catch (IOException e) {
}
}
if (packageName != null) {
String packageDotName = packageName.replace('/', '.');
Package packageObj = getPackage(packageDotName);
if (packageObj == null) {
definePackage(packageDotName, null, null,
null, null, null, null, null);
} else {
if (packageObj.isSealed()) {
throw new SecurityException(Msg
.getString("K004c")); //$NON-NLS-1$
}
}
}
return defineClass(origName, clBuf, 0, clBuf.length, new CodeSource(codeSourceUrl, (Certificate[]) null));
}
URL findResource(String name) {
URL resURL = targetURL(url, name);
if (resURL != null) {
try {
URLConnection uc = resURL.openConnection();
uc.getInputStream().close();
// HTTP can return a stream on a non-existent file
// So check for the return code;
if (!resURL.getProtocol().equals("http")) { //$NON-NLS-1$
return resURL;
}
int code;
if ((code = ((HttpURLConnection) uc).getResponseCode()) >= 200
&& code < 300) {
return resURL;
}
} catch (SecurityException e) {
return null;
} catch (IOException e) {
return null;
}
}
return null;
}
URL targetURL(URL base, String name) {
try {
String file = base.getFile() + URIEncoderDecoder.quoteIllegal(name,
"/@" + URI.someLegal);
return new URL(base.getProtocol(), base.getHost(), base.getPort(),
file, null);
} catch (UnsupportedEncodingException e) {
return null;
} catch (MalformedURLException e) {
return null;
}
}
}
class URLJarHandler extends URLHandler {
final JarFile jf;
final String prefixName;
final IndexFile index;
final Map<URL, URLHandler> subHandlers = new HashMap<URL, URLHandler>();
public URLJarHandler(URL url, URL jarURL, JarFile jf, String prefixName) {
super(url);
this.jf = jf;
this.prefixName = prefixName;
this.codeSourceUrl = jarURL;
final JarEntry je = jf.getJarEntry("META-INF/INDEX.LIST"); //$NON-NLS-1$
this.index = (je == null ? null : IndexFile.readIndexFile(jf, je, url));
}
public URLJarHandler(URL url, URL jarURL, JarFile jf, String prefixName, IndexFile index) {
super(url);
this.jf = jf;
this.prefixName = prefixName;
this.index = index;
this.codeSourceUrl = jarURL;
}
IndexFile getIndex() {
return index;
}
@Override
void findResources(String name, ArrayList<URL> resources) {
URL res = findResourceInOwn(name);
if (res != null && !resources.contains(res)) {
resources.add(res);
}
if (index != null) {
int pos = name.lastIndexOf("/"); //$NON-NLS-1$
// only keep the directory part of the resource
// as index.list only keeps track of directories and root files
String indexedName = (pos > 0) ? name.substring(0, pos) : name;
ArrayList<URL> urls = index.get(indexedName);
if (urls != null) {
urls.remove(url);
for (URL url : urls) {
URLHandler h = getSubHandler(url);
if (h != null) {
h.findResources(name, resources);
}
}
}
}
}
@Override
Class<?> findClass(String packageName, String name, String origName) {
String entryName = prefixName + name;
JarEntry entry = jf.getJarEntry(entryName);
if (entry != null) {
/**
* Avoid recursive load class, especially the class
* is an implementation class of security provider
* and the jar is signed.
*/
try {
Manifest manifest = jf.getManifest();
return createClass(entry, manifest, packageName, origName);
} catch (IOException e) {
}
}
if (index != null) {
ArrayList<URL> urls;
if (packageName == null) {
urls = index.get(name);
} else {
urls = index.get(packageName);
}
if (urls != null) {
urls.remove(url);
for (URL url : urls) {
URLHandler h = getSubHandler(url);
if (h != null) {
Class<?> res = h.findClass(packageName, name, origName);
if (res != null) {
return res;
}
}
}
}
}
return null;
}
private Class<?> createClass(JarEntry entry, Manifest manifest, String packageName, String origName) {
InputStream is = null;
byte[] clBuf = null;
try {
is = jf.getInputStream(entry);
clBuf = getBytes(is);
} catch (IOException e) {
return null;
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
}
}
}
if (packageName != null) {
String packageDotName = packageName.replace('/', '.');
Package packageObj = getPackage(packageDotName);
if (packageObj == null) {
if (manifest != null) {
definePackage(packageDotName, manifest,
codeSourceUrl);
} else {
definePackage(packageDotName, null, null,
null, null, null, null, null);
}
} else {
boolean exception = packageObj.isSealed();
if (manifest != null) {
if (isSealed(manifest, packageName + "/")) {
exception = !packageObj
.isSealed(codeSourceUrl);
}
}
if (exception) {
throw new SecurityException(Msg
.getString("K0352", packageName)); //$NON-NLS-1$
}
}
}
CodeSource codeS = new CodeSource(codeSourceUrl, entry.getCertificates());
return defineClass(origName, clBuf, 0, clBuf.length, codeS);
}
URL findResourceInOwn(String name) {
String entryName = prefixName + name;
if (jf.getEntry(entryName) != null) {
return targetURL(url, name);
}
return null;
}
@Override
URL findResource(String name) {
URL res = findResourceInOwn(name);
if (res != null) {
return res;
}
if (index != null) {
int pos = name.lastIndexOf("/"); //$NON-NLS-1$
// only keep the directory part of the resource
// as index.list only keeps track of directories and root files
String indexedName = (pos > 0) ? name.substring(0, pos) : name;
ArrayList<URL> urls = index.get(indexedName);
if (urls != null) {
urls.remove(url);
for (URL url : urls) {
URLHandler h = getSubHandler(url);
if (h != null) {
res = h.findResource(name);
if (res != null) {
return res;
}
}
}
}
}
return null;
}
private synchronized URLHandler getSubHandler(URL url) {
URLHandler sub = subHandlers.get(url);
if (sub != null) {
return sub;
}
String protocol = url.getProtocol();
if (protocol.equals("jar")) { //$NON-NLS-1$
sub = createURLJarHandler(url);
} else if (protocol.equals("file")) { //$NON-NLS-1$
sub = createURLSubJarHandler(url);
} else {
sub = createURLHandler(url);
}
if (sub != null) {
subHandlers.put(url, sub);
}
return sub;
}
private URLHandler createURLSubJarHandler(URL url) {
String prefixName;
String file = url.getFile();
if (url.getFile().endsWith("!/")) { //$NON-NLS-1$
prefixName = "";
} else {
int sepIdx = file.lastIndexOf("!/"); //$NON-NLS-1$
if (sepIdx == -1) {
// Invalid URL, don't look here again
return null;
}
sepIdx += 2;
prefixName = file.substring(sepIdx);
}
try {
URL jarURL = ((JarURLConnection) url
.openConnection()).getJarFileURL();
JarURLConnection juc = (JarURLConnection) new URL(
"jar", "", //$NON-NLS-1$ //$NON-NLS-2$
jarURL.toExternalForm() + "!/").openConnection(); //$NON-NLS-1$
JarFile jf = juc.getJarFile();
URLJarHandler jarH = new URLJarHandler(url, jarURL, jf, prefixName, null);
// TODO : to think what we should do with indexes & manifest.class file here
return jarH;
} catch (IOException e) {
}
return null;
}
}
class URLFileHandler extends URLHandler {
private String prefix;
public URLFileHandler(URL url) {
super(url);
String baseFile = url.getFile();
String host = url.getHost();
int hostLength = 0;
if (host != null) {
hostLength = host.length();
}
StringBuilder buf = new StringBuilder(2 + hostLength
+ baseFile.length());
if (hostLength > 0) {
buf.append("//").append(host); //$NON-NLS-1$
}
// baseFile always ends with '/'
buf.append(baseFile);
prefix = buf.toString();
}
@Override
Class<?> findClass(String packageName, String name, String origName) {
String filename = prefix + name;
try {
filename = URLDecoder.decode(filename, "UTF-8"); //$NON-NLS-1$
} catch (IllegalArgumentException e) {
return null;
} catch (UnsupportedEncodingException e) {
return null;
}
File file = new File(filename);
if (file.exists()) {
try {
InputStream is = new FileInputStream(file);
return createClass(is, packageName, origName);
} catch (FileNotFoundException e) {
}
}
return null;
}
@Override
URL findResource(String name) {
int idx = 0;
String filename;
// Do not create a UNC path, i.e. \\host
while (idx < name.length() &&
((name.charAt(idx) == '/') || (name.charAt(idx) == '\\'))) {
idx++;
}
if (idx > 0) {
name = name.substring(idx);
}
try {
filename = URLDecoder.decode(prefix, "UTF-8") + name; //$NON-NLS-1$
if (new File(filename).exists()) {
return targetURL(url, name);
}
return null;
} catch (IllegalArgumentException e) {
return null;
} catch (UnsupportedEncodingException e) {
// must not happen
throw new AssertionError(e);
}
}
}
/**
* Constructs a new {@code URLClassLoader} instance. The newly created
* instance will have the system ClassLoader as its parent. URLs that end
* with "/" are assumed to be directories, otherwise they are assumed to be
* JAR files.
*
* @param urls
* the list of URLs where a specific class or file could be
* found.
* @throws SecurityException
* if a security manager exists and its {@code
* checkCreateClassLoader()} method doesn't allow creation of
* new ClassLoaders.
*/
public URLClassLoader(URL[] urls) {
this(urls, ClassLoader.getSystemClassLoader(), null);
}
/**
* Constructs a new URLClassLoader instance. The newly created instance will
* have the system ClassLoader as its parent. URLs that end with "/" are
* assumed to be directories, otherwise they are assumed to be JAR files.
*
* @param urls
* the list of URLs where a specific class or file could be
* found.
* @param parent
* the class loader to assign as this loader's parent.
* @throws SecurityException
* if a security manager exists and its {@code
* checkCreateClassLoader()} method doesn't allow creation of
* new class loaders.
*/
public URLClassLoader(URL[] urls, ClassLoader parent) {
this(urls, parent, null);
}
/**
* Adds the specified URL to the search list.
*
* @param url
* the URL which is to add.
*/
protected void addURL(URL url) {
try {
originalUrls.add(url);
searchList.add(createSearchURL(url));
} catch (MalformedURLException e) {
}
}
/**
* Returns all known URLs which point to the specified resource.
*
* @param name
* the name of the requested resource.
* @return the enumeration of URLs which point to the specified resource.
* @throws IOException
* if an I/O error occurs while attempting to connect.
*/
@Override
public Enumeration<URL> findResources(final String name) throws IOException {
if (name == null) {
return null;
}
ArrayList<URL> result = AccessController.doPrivileged(
new PrivilegedAction<ArrayList<URL>>() {
public ArrayList<URL> run() {
ArrayList<URL> results = new ArrayList<URL>();
findResourcesImpl(name, results);
return results;
}
}, currentContext);
SecurityManager sm;
int length = result.size();
if (length > 0 && (sm = System.getSecurityManager()) != null) {
ArrayList<URL> reduced = new ArrayList<URL>(length);
for (int i = 0; i < length; i++) {
URL url = result.get(i);
try {
sm.checkPermission(url.openConnection().getPermission());
reduced.add(url);
} catch (IOException e) {
} catch (SecurityException e) {
}
}
result = reduced;
}
return Collections.enumeration(result);
}
void findResourcesImpl(String name, ArrayList<URL> result) {
int n = 0;
while (true) {
URLHandler handler = getHandler(n++);
if (handler == null) {
break;
}
handler.findResources(name, result);
}
}
/**
* Converts an input stream into a byte array.
*
* @param is
* the input stream
* @return byte[] the byte array
*/
private static byte[] getBytes(InputStream is)
throws IOException {
byte[] buf = new byte[4096];
ByteArrayOutputStream bos = new ByteArrayOutputStream(4096);
int count;
while ((count = is.read(buf)) > 0) {
bos.write(buf, 0, count);
}
return bos.toByteArray();
}
/**
* Gets all permissions for the specified {@code codesource}. First, this
* method retrieves the permissions from the system policy. If the protocol
* is "file:/" then a new permission, {@code FilePermission}, granting the
* read permission to the file is added to the permission collection.
* Otherwise, connecting to and accepting connections from the URL is
* granted.
*
* @param codesource
* the code source object whose permissions have to be known.
* @return the list of permissions according to the code source object.
*/
@Override
protected PermissionCollection getPermissions(final CodeSource codesource) {
PermissionCollection pc = super.getPermissions(codesource);
URL u = codesource.getLocation();
if (u.getProtocol().equals("jar")) { //$NON-NLS-1$
try {
// Create a URL for the resource the jar refers to
u = ((JarURLConnection) u.openConnection()).getJarFileURL();
} catch (IOException e) {
// This should never occur. If it does continue using the jar
// URL
}
}
if (u.getProtocol().equals("file")) { //$NON-NLS-1$
String path = u.getFile();
String host = u.getHost();
if (host != null && host.length() > 0) {
path = "//" + host + path; //$NON-NLS-1$
}
if (File.separatorChar != '/') {
path = path.replace('/', File.separatorChar);
}
if (isDirectory(u)) {
pc.add(new FilePermission(path + "-", "read")); //$NON-NLS-1$ //$NON-NLS-2$
} else {
pc.add(new FilePermission(path, "read")); //$NON-NLS-1$
}
} else {
String host = u.getHost();
if (host.length() == 0) {
host = "localhost"; //$NON-NLS-1$
}
pc.add(new SocketPermission(host, "connect, accept")); //$NON-NLS-1$
}
return pc;
}
/**
* Returns the search list of this {@code URLClassLoader}.
*
* @return the list of all known URLs of this instance.
*/
public URL[] getURLs() {
return originalUrls.toArray(new URL[originalUrls.size()]);
}
/**
* Determines if the URL is pointing to a directory.
*/
private static boolean isDirectory(URL url) {
String file = url.getFile();
return (file.length() > 0 && file.charAt(file.length() - 1) == '/');
}
/**
* Returns a new {@code URLClassLoader} instance for the given URLs and the
* system {@code ClassLoader} as its parent. The method {@code loadClass()}
* of the new instance will call {@code
* SecurityManager.checkPackageAccess()} before loading a class.
*
* @param urls
* the list of URLs that is passed to the new {@code
* URLClassloader}.
* @return the created {@code URLClassLoader} instance.
*/
public static URLClassLoader newInstance(final URL[] urls) {
URLClassLoader sub = AccessController
.doPrivileged(new PrivilegedAction<URLClassLoader>() {
public URLClassLoader run() {
return new SubURLClassLoader(urls);
}
});
sub.currentContext = AccessController.getContext();
return sub;
}
/**
* Returns a new {@code URLClassLoader} instance for the given URLs and the
* specified {@code ClassLoader} as its parent. The method {@code
* loadClass()} of the new instance will call the SecurityManager's {@code
* checkPackageAccess()} before loading a class.
*
* @param urls
* the list of URLs that is passed to the new URLClassloader.
* @param parentCl
* the parent class loader that is passed to the new
* URLClassloader.
* @return the created {@code URLClassLoader} instance.
*/
public static URLClassLoader newInstance(final URL[] urls,
final ClassLoader parentCl) {
URLClassLoader sub = AccessController
.doPrivileged(new PrivilegedAction<URLClassLoader>() {
public URLClassLoader run() {
return new SubURLClassLoader(urls, parentCl);
}
});
sub.currentContext = AccessController.getContext();
return sub;
}
/**
* Constructs a new {@code URLClassLoader} instance. The newly created
* instance will have the specified {@code ClassLoader} as its parent and
* use the specified factory to create stream handlers. URLs that end with
* "/" are assumed to be directories, otherwise they are assumed to be JAR
* files.
*
* @param searchUrls
* the list of URLs where a specific class or file could be
* found.
* @param parent
* the {@code ClassLoader} to assign as this loader's parent.
* @param factory
* the factory that will be used to create protocol-specific
* stream handlers.
* @throws SecurityException
* if a security manager exists and its {@code
* checkCreateClassLoader()} method doesn't allow creation of
* new {@code ClassLoader}s.
*/
public URLClassLoader(URL[] searchUrls, ClassLoader parent,
URLStreamHandlerFactory factory) {
super(parent);
// Required for pre-v1.2 security managers to work
SecurityManager security = System.getSecurityManager();
if (security != null) {
security.checkCreateClassLoader();
}
this.factory = factory;
// capture the context of the thread that creates this URLClassLoader
currentContext = AccessController.getContext();
int nbUrls = searchUrls.length;
originalUrls = new ArrayList<URL>(nbUrls);
handlerList = new ArrayList<URLHandler>(nbUrls);
searchList = Collections.synchronizedList(new ArrayList<URL>(nbUrls));
for (int i = 0; i < nbUrls; i++) {
originalUrls.add(searchUrls[i]);
try {
searchList.add(createSearchURL(searchUrls[i]));
} catch (MalformedURLException e) {
}
}
}
/**
* Tries to locate and load the specified class using the known URLs. If the
* class could be found, a class object representing the loaded class will
* be returned.
*
* @param clsName
* the name of the class which has to be found.
* @return the class that has been loaded.
* @throws ClassNotFoundException
* if the specified class cannot be loaded.
*/
@Override
protected Class<?> findClass(final String clsName)
throws ClassNotFoundException {
Class<?> cls = AccessController.doPrivileged(
new PrivilegedAction<Class<?>>() {
public Class<?> run() {
return findClassImpl(clsName);
}
}, currentContext);
if (cls != null) {
return cls;
}
throw new ClassNotFoundException(clsName);
}
/**
* Returns an URL that will be checked if it contains the class or resource.
* If the file component of the URL is not a directory, a Jar URL will be
* created.
*
* @return java.net.URL a test URL
*/
private URL createSearchURL(URL url) throws MalformedURLException {
if (url == null) {
return url;
}
String protocol = url.getProtocol();
if (isDirectory(url) || protocol.equals("jar")) { //$NON-NLS-1$
return url;
}
if (factory == null) {
return new URL("jar", "", //$NON-NLS-1$ //$NON-NLS-2$
-1, url.toString() + "!/"); //$NON-NLS-1$
}
// use jar protocol as the stream handler protocol
return new URL("jar", "", //$NON-NLS-1$ //$NON-NLS-2$
-1, url.toString() + "!/", //$NON-NLS-1$
factory.createURLStreamHandler("jar"));//$NON-NLS-1$
}
/**
* Returns an URL referencing the specified resource or {@code null} if the
* resource could not be found.
*
* @param name
* the name of the requested resource.
* @return the URL which points to the given resource.
*/
@Override
public URL findResource(final String name) {
if (name == null) {
return null;
}
URL result = AccessController.doPrivileged(new PrivilegedAction<URL>() {
public URL run() {
return findResourceImpl(name);
}
}, currentContext);
SecurityManager sm;
if (result != null && (sm = System.getSecurityManager()) != null) {
try {
sm.checkPermission(result.openConnection().getPermission());
} catch (IOException e) {
return null;
} catch (SecurityException e) {
return null;
}
}
return result;
}
/**
* Returns a URL among the given ones referencing the specified resource or
* null if no resource could be found.
*
* @param resName java.lang.String the name of the requested resource
* @return URL URL for the resource.
*/
URL findResourceImpl(String resName) {
int n = 0;
while (true) {
URLHandler handler = getHandler(n++);
if (handler == null) {
break;
}
URL res = handler.findResource(resName);
if (res != null) {
return res;
}
}
return null;
}
URLHandler getHandler(int num) {
if (num < handlerList.size()) {
return handlerList.get(num);
}
makeNewHandler();
if (num < handlerList.size()) {
return handlerList.get(num);
}
return null;
}
private synchronized void makeNewHandler() {
while (!searchList.isEmpty()) {
URL nextCandidate = searchList.remove(0);
if (nextCandidate == null) { // KA024=One of urls is null
throw new NullPointerException(Msg.getString("KA024")); //$NON-NLS-1$
}
if (!handlerMap.containsKey(nextCandidate)) {
URLHandler result;
String protocol = nextCandidate.getProtocol();
if (protocol.equals("jar")) { //$NON-NLS-1$
result = createURLJarHandler(nextCandidate);
} else if (protocol.equals("file")) { //$NON-NLS-1$
result = createURLFileHandler(nextCandidate);
} else {
result = createURLHandler(nextCandidate);
}
if (result != null) {
handlerMap.put(nextCandidate, result);
handlerList.add(result);
return;
}
}
}
}
private URLHandler createURLHandler(URL url) {
return new URLHandler(url);
}
private URLHandler createURLFileHandler(URL url) {
return new URLFileHandler(url);
}
private URLHandler createURLJarHandler(URL url) {
String prefixName;
String file = url.getFile();
if (url.getFile().endsWith("!/")) { //$NON-NLS-1$
prefixName = "";
} else {
int sepIdx = file.lastIndexOf("!/"); //$NON-NLS-1$
if (sepIdx == -1) {
// Invalid URL, don't look here again
return null;
}
sepIdx += 2;
prefixName = file.substring(sepIdx);
}
try {
URL jarURL = ((JarURLConnection) url
.openConnection()).getJarFileURL();
JarURLConnection juc = (JarURLConnection) new URL(
"jar", "", //$NON-NLS-1$ //$NON-NLS-2$
jarURL.toExternalForm() + "!/").openConnection(); //$NON-NLS-1$
JarFile jf = juc.getJarFile();
URLJarHandler jarH = new URLJarHandler(url, jarURL, jf, prefixName);
if (jarH.getIndex() == null) {
try {
Manifest manifest = jf.getManifest();
if (manifest != null) {
String classpath = manifest.getMainAttributes().getValue(
Attributes.Name.CLASS_PATH);
if (classpath != null) {
searchList.addAll(0, getInternalURLs(url, classpath));
}
}
} catch (IOException e) {
}
}
return jarH;
} catch (IOException e) {
}
return null;
}
/**
* Defines a new package using the information extracted from the specified
* manifest.
*
* @param packageName
* the name of the new package.
* @param manifest
* the manifest containing additional information for the new
* package.
* @param url
* the URL to the code source for the new package.
* @return the created package.
* @throws IllegalArgumentException
* if a package with the given name already exists.
*/
protected Package definePackage(String packageName, Manifest manifest,
URL url) throws IllegalArgumentException {
Attributes mainAttributes = manifest.getMainAttributes();
String dirName = packageName.replace('.', '/') + "/"; //$NON-NLS-1$
Attributes packageAttributes = manifest.getAttributes(dirName);
boolean noEntry = false;
if (packageAttributes == null) {
noEntry = true;
packageAttributes = mainAttributes;
}
String specificationTitle = packageAttributes
.getValue(Attributes.Name.SPECIFICATION_TITLE);
if (specificationTitle == null && !noEntry) {
specificationTitle = mainAttributes
.getValue(Attributes.Name.SPECIFICATION_TITLE);
}
String specificationVersion = packageAttributes
.getValue(Attributes.Name.SPECIFICATION_VERSION);
if (specificationVersion == null && !noEntry) {
specificationVersion = mainAttributes
.getValue(Attributes.Name.SPECIFICATION_VERSION);
}
String specificationVendor = packageAttributes
.getValue(Attributes.Name.SPECIFICATION_VENDOR);
if (specificationVendor == null && !noEntry) {
specificationVendor = mainAttributes
.getValue(Attributes.Name.SPECIFICATION_VENDOR);
}
String implementationTitle = packageAttributes
.getValue(Attributes.Name.IMPLEMENTATION_TITLE);
if (implementationTitle == null && !noEntry) {
implementationTitle = mainAttributes
.getValue(Attributes.Name.IMPLEMENTATION_TITLE);
}
String implementationVersion = packageAttributes
.getValue(Attributes.Name.IMPLEMENTATION_VERSION);
if (implementationVersion == null && !noEntry) {
implementationVersion = mainAttributes
.getValue(Attributes.Name.IMPLEMENTATION_VERSION);
}
String implementationVendor = packageAttributes
.getValue(Attributes.Name.IMPLEMENTATION_VENDOR);
if (implementationVendor == null && !noEntry) {
implementationVendor = mainAttributes
.getValue(Attributes.Name.IMPLEMENTATION_VENDOR);
}
return definePackage(packageName, specificationTitle,
specificationVersion, specificationVendor, implementationTitle,
implementationVersion, implementationVendor, isSealed(manifest,
dirName) ? url : null);
}
private boolean isSealed(Manifest manifest, String dirName) {
Attributes mainAttributes = manifest.getMainAttributes();
String value = mainAttributes.getValue(Attributes.Name.SEALED);
boolean sealed = value != null && value.toLowerCase().equals("true"); //$NON-NLS-1$
Attributes attributes = manifest.getAttributes(dirName);
if (attributes != null) {
value = attributes.getValue(Attributes.Name.SEALED);
if (value != null) {
sealed = value.toLowerCase().equals("true"); //$NON-NLS-1$
}
}
return sealed;
}
/**
* returns URLs referenced in the string classpath.
*
* @param root
* the jar URL that classpath is related to
* @param classpath
* the relative URLs separated by spaces
* @return URL[] the URLs contained in the string classpath.
*/
private ArrayList<URL> getInternalURLs(URL root, String classpath) {
// Class-path attribute is composed of space-separated values.
StringTokenizer tokenizer = new StringTokenizer(classpath);
ArrayList<URL> addedURLs = new ArrayList<URL>();
String file = root.getFile();
int jarIndex = file.lastIndexOf("!/") - 1; //$NON-NLS-1$
int index = file.lastIndexOf("/", jarIndex) + 1; //$NON-NLS-1$
if (index == 0) {
index = file.lastIndexOf(
System.getProperty("file.separator"), jarIndex) + 1; //$NON-NLS-1$
}
file = file.substring(0, index);
while (tokenizer.hasMoreElements()) {
String element = tokenizer.nextToken();
if (!element.equals("")) { //$NON-NLS-1$
try {
// Take absolute path case into consideration
URL url = new URL(new URL(file), element);
addedURLs.add(createSearchURL(url));
} catch (MalformedURLException e) {
// Nothing is added
}
}
}
return addedURLs;
}
Class<?> findClassImpl(String className) {
String partialName = className.replace('.', '/');
final String classFileName = new StringBuilder(partialName).append(".class").toString(); //$NON-NLS-1$
String packageName = null;
int position = partialName.lastIndexOf('/');
if ((position = partialName.lastIndexOf('/')) != -1) {
packageName = partialName.substring(0, position);
}
int n = 0;
while (true) {
URLHandler handler = getHandler(n++);
if (handler == null) {
break;
}
Class<?> res = handler.findClass(packageName, classFileName, className);
if (res != null) {
return res;
}
}
return null;
}
}