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Java Source Code / Java Documentation » Development » Javolution » javolution.context 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   javolution.context.Context
      javolution.context.SecurityContext

SecurityContext
abstract public class SecurityContext extends Context (Code)

This class represents a high-level security context (low level security being addressed by the system security manager).

Applications may extend this base class to address specific security requirements. For example:[code] // This class defines custom policy with regards to database access. public abstract class DatabaseAccess extends SecurityContext { public static boolean isReadAllowed(Table table) { SecurityContext policy = SecurityContext.current(); return (policy instanceof DatabaseAccess.Permission) ? ((DatabaseAccess.Permission)policy).isReadable(table) : false; } public interface Permission { boolean isReadable(Table table); boolean isWritable(Table table); } }[/code]

The use of interfaces (such as Permission above) makes it easy for custom policies to support any security actions. For example:[code] class Policy extends SecurityContext implements DatabaseAccess.Permission, FileAccess.Permission { public boolean isReadable(Table table) { return !table.isPrivate(); } public boolean isWritable(Table table) { return Session.getSession().getUser().isAdministrator(); } public boolean isReadable(File file) { return true; } public boolean isWritable(File file) { return false; } } ... Policy localPolicy = new Policy(); SecurityContext.enter(localPolicy); // Current thread overrides default policy (configurable) try { // (if allowed, ref. SecurityContext.isReplaceable()) ... DatabaseAccess.isReadAllowed(table); ... FileAccess.isWriteAllowed(file); ... } finally { SecurityContext.exit(); }[/code]

The default permissions managed by the SecurityContext.DEFAULT implementation are the permission to SecurityContext.isReplaceable replace the current security context by default) and the permission to SecurityContext.isModifiable modify all the application javolution.lang.Configurable.Logic configuration settings.


author:
   Jean-Marie Dautelle
version:
   5.2, August 5, 2007


Field Summary
final public static  ConfigurableDEFAULT
     Holds the default security context implementation (configurable).

Constructor Summary
protected  SecurityContext()
     Default constructor.

Method Summary
final protected  voidenterAction()
    
final protected  voidexitAction()
    
public static  ContextgetCurrent()
     Returns the current security context.
public static  SecurityContextgetDefault()
     Returns the default instance ( SecurityContext.DEFAULT implementation).
public  booleanisModifiable(Configurable cfg)
     Indicates if this security context allows modification of the javolution.lang.Configurable.Logic configuration settings (default true).
public  booleanisReplaceable()
     Indicates if a new security context can be entered (default true).

Field Detail
DEFAULT
final public static Configurable DEFAULT(Code)
Holds the default security context implementation (configurable).




Constructor Detail
SecurityContext
protected SecurityContext()(Code)
Default constructor.




Method Detail
enterAction
final protected void enterAction()(Code)



exitAction
final protected void exitAction()(Code)



getCurrent
public static Context getCurrent()(Code)
Returns the current security context. If the current thread has not entered any security context then SecurityContext.getDefault() is returned. the current security context.



getDefault
public static SecurityContext getDefault()(Code)
Returns the default instance ( SecurityContext.DEFAULT implementation). the default instance.



isModifiable
public boolean isModifiable(Configurable cfg)(Code)
Indicates if this security context allows modification of the javolution.lang.Configurable.Logic configuration settings (default true). Applications may override this method to return false and prevent untrusted code to update the some/all configuration parameters.
Parameters:
  cfg - the configurable to check if modifiable. true if the specified configurable can be modified;false otherwise.



isReplaceable
public boolean isReplaceable()(Code)
Indicates if a new security context can be entered (default true). Applications may return false and prevent untrusted code to increase their privileges. Usually, such security setting should also prevent reconfiguring of the SecurityContext.DEFAULT default context by making SecurityContext.DEFAULT not SecurityContext.isModifiable modifiable . true if a new security context can be entered;false otherwise.



Fields inherited from javolution.context.Context
final public static Context ROOT(Code)(Java Doc)

Methods inherited from javolution.context.Context
final public static Context enter(Context context)(Code)(Java Doc)
final public static Context enter(Class contextType)(Code)(Java Doc)
abstract protected void enterAction()(Code)(Java Doc)
public static Context exit()(Code)(Java Doc)
final public static void exit(Context ctx)(Code)(Java Doc)
abstract protected void exitAction()(Code)(Java Doc)
final AllocatorContext getAllocatorContext()(Code)(Java Doc)
public static Context getCurrent()(Code)(Java Doc)
final public Context getOuter()(Code)(Java Doc)
final public Thread getOwner()(Code)(Java Doc)
protected static void setCurrent(ConcurrentContext context)(Code)(Java Doc)
public String toString()(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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