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*
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package com.sun.media.sound;
import java.io.Reader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.ServiceLoader;
import javax.sound.sampled.AudioPermission;
Managing security in the Java Sound implementation.
This class contains all code that uses and is used by
SecurityManager.doPrivileged().
Author: Matthias Pfisterer
/** Managing security in the Java Sound implementation.
* This class contains all code that uses and is used by
* SecurityManager.doPrivileged().
*
* @author Matthias Pfisterer
*/
final class JSSecurityManager {
Prevent instantiation.
/** Prevent instantiation.
*/
private JSSecurityManager() {
}
static void checkRecordPermission() throws SecurityException {
if(Printer.trace) Printer.trace("JSSecurityManager.checkRecordPermission()");
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new AudioPermission("record"));
}
}
Load properties from a file.
This method tries to load properties from the filename give into the
passed properties object. If the file cannot be found or something else
goes wrong, the method silently fails.
If the file referenced in "javax.sound.config.file" property exists and
the user has an access to it, then it will be loaded, otherwise default
configuration file "JAVA_HOME/conf/sound.properties" will be loaded.
Params: - properties – the properties bundle to store the values of the
properties file
/**
* Load properties from a file.
* <p>
* This method tries to load properties from the filename give into the
* passed properties object. If the file cannot be found or something else
* goes wrong, the method silently fails.
* <p>
* If the file referenced in "javax.sound.config.file" property exists and
* the user has an access to it, then it will be loaded, otherwise default
* configuration file "JAVA_HOME/conf/sound.properties" will be loaded.
*
* @param properties the properties bundle to store the values of the
* properties file
*/
static void loadProperties(final Properties properties) {
final String customFile = AccessController.doPrivileged(
(PrivilegedAction<String>) () -> System.getProperty(
"javax.sound.config.file"));
if (customFile != null) {
if (loadPropertiesImpl(properties, customFile)) {
return;
}
}
AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
final String home = System.getProperty("java.home");
if (home == null) {
throw new Error("Can't find java.home ??");
}
loadPropertiesImpl(properties, home, "conf", "sound.properties");
return null;
});
}
private static boolean loadPropertiesImpl(final Properties properties,
String first, String... more) {
final Path fname = Paths.get(first, more);
try (final Reader reader = Files.newBufferedReader(fname)) {
properties.load(reader);
return true;
} catch (final Throwable t) {
return false;
}
}
Create a Thread in the current ThreadGroup.
/** Create a Thread in the current ThreadGroup.
*/
static Thread createThread(final Runnable runnable,
final String threadName,
final boolean isDaemon, final int priority,
final boolean doStart)
{
String name = (threadName != null) ? threadName : "JSSM Thread";
Thread thread = new Thread(null, runnable, threadName, 0, false);
thread.setDaemon(isDaemon);
if (priority >= 0) {
thread.setPriority(priority);
}
if (doStart) {
thread.start();
}
return thread;
}
static synchronized <T> List<T> getProviders(final Class<T> providerClass) {
List<T> p = new ArrayList<>(7);
// ServiceLoader creates "lazy" iterator instance, but it ensures that
// next/hasNext run with permissions that are restricted by whatever
// creates the ServiceLoader instance, so it requires to be called from
// privileged section
final PrivilegedAction<Iterator<T>> psAction =
new PrivilegedAction<Iterator<T>>() {
@Override
public Iterator<T> run() {
return ServiceLoader.load(providerClass).iterator();
}
};
final Iterator<T> ps = AccessController.doPrivileged(psAction);
// the iterator's hasNext() method looks through classpath for
// the provider class names, so it requires read permissions
PrivilegedAction<Boolean> hasNextAction = new PrivilegedAction<Boolean>() {
@Override
public Boolean run() {
return ps.hasNext();
}
};
while (AccessController.doPrivileged(hasNextAction)) {
try {
// the iterator's next() method creates instances of the
// providers and it should be called in the current security
// context
T provider = ps.next();
if (providerClass.isInstance(provider)) {
// $$mp 2003-08-22
// Always adding at the beginning reverses the
// order of the providers. So we no longer have
// to do this in AudioSystem and MidiSystem.
p.add(0, provider);
}
} catch (Throwable t) {
//$$fb 2002-11-07: do not fail on SPI not found
if (Printer.err) t.printStackTrace();
}
}
return p;
}
}