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/*******************************************************************************
* Copyright (c) 2003, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.framework.util;
import java.io.*;
import java.security.*;
import java.util.Properties;
/**
* Utility class to execute common privileged code.
*/
public class SecureAction {
/**
* Returns a system property. Same as calling
* System.getProperty(String).
* @param property the property key.
* @return the value of the property or null if it does not exist.
*/
public static String getProperty(final String property) {
if (System.getSecurityManager() == null)
return System.getProperty(property);
else
return (String) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return System.getProperty(property);
}
});
}
/**
* Returns a system property. Same as calling
* System.getProperty(String,String).
* @param property the property key.
* @param def the default value if the property key does not exist.
* @return the value of the property or the def value if the property
* does not exist.
*/
public static String getProperty(final String property, final String def) {
if (System.getSecurityManager() == null)
return System.getProperty(property, def);
else
return (String) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return System.getProperty(property, def);
}
});
}
/**
* Returns the system properties. Same as calling
* System.getProperties().
* @return the system properties.
*/
public static Properties getProperties() {
if (System.getSecurityManager() == null)
return System.getProperties();
else
return (Properties) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return System.getProperties();
}
});
}
/**
* Creates a FileInputStream from a File. Same as calling
* new FileInputStream(File).
* @param file the File to craete a FileInputStream from.
* @return The FileInputStream.
* @throws FileNotFoundException if the File does not exist.
*/
public static FileInputStream getFileInputStream(final File file) throws FileNotFoundException {
if (System.getSecurityManager() == null)
return new FileInputStream(file);
else
try {
return (FileInputStream) AccessController.doPrivileged(new PrivilegedExceptionAction() {
public Object run() throws FileNotFoundException {
return new FileInputStream(file);
}
});
} catch (PrivilegedActionException e) {
throw (FileNotFoundException) e.getException();
}
}
/**
* Creates a FileInputStream from a File. Same as calling
* new FileOutputStream(File,boolean).
* @param file the File to create a FileOutputStream from.
* @param append indicates if the OutputStream should append content.
* @return The FileOutputStream.
* @throws FileNotFoundException if the File does not exist.
*/
public static FileOutputStream getFileOutputStream(final File file, final boolean append) throws FileNotFoundException {
if (System.getSecurityManager() == null)
return new FileOutputStream(file.getAbsolutePath(), append);
else
try {
return (FileOutputStream) AccessController.doPrivileged(new PrivilegedExceptionAction() {
public Object run() throws FileNotFoundException {
return new FileOutputStream(file.getAbsolutePath(), append);
}
});
} catch (PrivilegedActionException e) {
throw (FileNotFoundException) e.getException();
}
}
/**
* Creates a new Thread from a Runnable. Same as calling
* new Thread(target,name).
* @param target the Runnable to create the Thread from.
* @param name The name of the Thread.
* @return The new Thread
*/
public static Thread createThread(final Runnable target, final String name) {
if (System.getSecurityManager() == null)
return new Thread(target, name);
else {
return (Thread) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return new Thread(target, name);
}
});
}
}
}
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