/*
* <p>
* An required extension is missing, if an ExtensionInstallationProvider is
* registered, delegate the installation of that particular extension to it.
* </p>
*
* @param reqInfo Missing extension information
* @param instInfo Older installed version information
*
* @return true if the installation is successful
*/
protected boolean installExtension(ExtensionInfo reqInfo, ExtensionInfo instInfo)
throws ExtensionInstallationException {
Vector currentProviders;
synchronized (providers) {
currentProviders = (Vector) providers.clone();
}
for (Enumeration e = currentProviders.elements(); e.hasMoreElements(); ) {
ExtensionInstallationProvider eip = (ExtensionInstallationProvider) e.nextElement();
if (eip != null) {
// delegate the installation to the provider
if (eip.installExtension(reqInfo, instInfo)) {
debug(reqInfo.name + " installation successful");
Launcher.ExtClassLoader cl =
(Launcher.ExtClassLoader) Launcher.getLauncher().getClassLoader().getParent();
addNewExtensionsToClassLoader(cl);
return true;
}
}
}
// We have tried all of our providers, noone could install this
// extension, we just return failure at this point
debug(reqInfo.name + " installation failed");
return false;
}
/*
* <p>
* Check that a particular dependency on an extension is satisfied.
* </p>
* @param extensionName is the key used for the attributes in the manifest
* @param attr is the attributes of the manifest file
*
* @return true if the dependency is satisfied by the installed extensions
*/
protected boolean checkExtension(final String extensionName, final Attributes attr)
throws ExtensionInstallationException {
debug("Checking extension " + extensionName);
if (checkExtensionAgainstInstalled(extensionName, attr)) return true;
debug("Extension not currently installed ");
ExtensionInfo reqInfo = new ExtensionInfo(extensionName, attr);
return installExtension(reqInfo, null);
}
/*
* Check for all declared required extensions in the jar file
* manifest.
*/
protected boolean checkExtensions(JarFile jar) throws ExtensionInstallationException {
Manifest man;
try {
man = jar.getManifest();
} catch (IOException e) {
return false;
}
if (man == null) {
// The applet does not define a manifest file, so
// we just assume all dependencies are satisfied.
return true;
}
boolean result = true;
Attributes attr = man.getMainAttributes();
if (attr != null) {
// Let's get the list of declared dependencies
String value = attr.getValue(Name.EXTENSION_LIST);
if (value != null) {
StringTokenizer st = new StringTokenizer(value);
// Iterate over all declared dependencies
while (st.hasMoreTokens()) {
String extensionName = st.nextToken();
debug("The file " + jar.getName() + " appears to depend on " + extensionName);
// Sanity Check
String extName = extensionName + "-" + Name.EXTENSION_NAME.toString();
if (attr.getValue(extName) == null) {
debug(
"The jar file "
+ jar.getName()
+ " appers to depend on "
+ extensionName
+ " but does not define the "
+ extName
+ " attribute in its manifest ");
} else {
if (!checkExtension(extensionName, attr)) {
debug("Failed installing " + extensionName);
result = false;
}
}
}
} else {
debug("No dependencies for " + jar.getName());
}
}
return result;
}
/*
* <p>
* Scan the directories and return all files installed in those
* </p>
* @param dirs list of directories to scan
*
* @return the list of files installed in all the directories
*/
private static File[] getExtFiles(File[] dirs) throws IOException {
Vector urls = new Vector();
for (int i = 0; i < dirs.length; i++) {
String[] files = dirs[i].list(new JarFilter());
debug("getExtFiles files.length " + files.length);
if (files != null) {
for (int j = 0; j < files.length; j++) {
File f = new File(dirs[i], files[j]);
urls.add(f);
debug("getExtFiles f[" + j + "] " + f);
}
}
}
File[] ua = new File[urls.size()];
urls.copyInto(ua);
debug("getExtFiles ua.length " + ua.length);
return ua;
}
/*
* <p>
* Add the newly installed jar file to the extension class loader.
* </p>
*
* @param cl the current installed extension class loader
*
* @return true if successful
*/
private Boolean addNewExtensionsToClassLoader(Launcher.ExtClassLoader cl) {
try {
File[] installedExts = getInstalledExtensions();
for (int i = 0; i < installedExts.length; i++) {
final File instFile = installedExts[i];
URL instURL =
(URL)
AccessController.doPrivileged(
new PrivilegedAction() {
public Object run() {
try {
return (URL) ParseUtil.fileToEncodedURL(instFile);
} catch (MalformedURLException e) {
debugException(e);
return null;
}
}
});
if (instURL != null) {
URL[] urls = cl.getURLs();
boolean found = false;
for (int j = 0; j < urls.length; j++) {
debug("URL[" + j + "] is " + urls[j] + " looking for " + instURL);
if (urls[j].toString().compareToIgnoreCase(instURL.toString()) == 0) {
found = true;
debug("Found !");
}
}
if (!found) {
debug("Not Found ! adding to the classloader " + instURL);
cl.addExtURL(instURL);
}
}
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
// let's continue with the next installed extension
}
return Boolean.TRUE;
}
/** @return the java.ext.dirs property as a list of directory */
private static File[] getExtDirs() {
String s =
(String)
java.security.AccessController.doPrivileged(
new sun.security.action.GetPropertyAction("java.ext.dirs"));
File[] dirs;
if (s != null) {
StringTokenizer st = new StringTokenizer(s, File.pathSeparator);
int count = st.countTokens();
debug("getExtDirs count " + count);
dirs = new File[count];
for (int i = 0; i < count; i++) {
dirs[i] = new File(st.nextToken());
debug("getExtDirs dirs[" + i + "] " + dirs[i]);
}
} else {
dirs = new File[0];
debug("getExtDirs dirs " + dirs);
}
debug("getExtDirs dirs.length " + dirs.length);
return dirs;
}
/**
* Checks the dependencies of the jar file on installed extension.
*
* @param jarFile containing the attriutes declaring the dependencies
*/
public static synchronized boolean checkExtensionsDependencies(JarFile jar) {
if (providers == null) {
// no need to bother, nobody is registered to install missing
// extensions
return true;
}
try {
ExtensionDependency extDep = new ExtensionDependency();
return extDep.checkExtensions(jar);
} catch (ExtensionInstallationException e) {
debug(e.getMessage());
}
return false;
}
/*
* <p>
* Check if the requested extension described by the attributes
* in the manifest under the key extensionName is compatible with
* the jar file.
* </p>
*
* @param extensionName key in the attibute list
* @param attr manifest file attributes
* @param file installed extension jar file to compare the requested
* extension against.
*/
protected boolean checkExtensionAgainst(String extensionName, Attributes attr, final File file)
throws IOException, FileNotFoundException, ExtensionInstallationException {
debug("Checking extension " + extensionName + " against " + file.getName());
// Load the jar file ...
Manifest man;
try {
man =
(Manifest)
AccessController.doPrivileged(
new PrivilegedExceptionAction() {
public Object run() throws IOException, FileNotFoundException {
if (!file.exists()) throw new FileNotFoundException(file.getName());
JarFile jarFile = new JarFile(file);
return jarFile.getManifest();
}
});
} catch (PrivilegedActionException e) {
if (e.getException() instanceof FileNotFoundException)
throw (FileNotFoundException) e.getException();
throw (IOException) e.getException();
}
// Construct the extension information object
ExtensionInfo reqInfo = new ExtensionInfo(extensionName, attr);
debug("Requested Extension : " + reqInfo);
int isCompatible = ExtensionInfo.INCOMPATIBLE;
ExtensionInfo instInfo = null;
if (man != null) {
Attributes instAttr = man.getMainAttributes();
if (instAttr != null) {
instInfo = new ExtensionInfo(null, instAttr);
debug("Extension Installed " + instInfo);
isCompatible = instInfo.isCompatibleWith(reqInfo);
switch (isCompatible) {
case ExtensionInfo.COMPATIBLE:
debug("Extensions are compatible");
return true;
case ExtensionInfo.INCOMPATIBLE:
debug("Extensions are incompatible");
return false;
default:
// everything else
debug("Extensions require an upgrade or vendor switch");
return installExtension(reqInfo, instInfo);
}
}
}
return true;
}