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package javax.security.jacc;
import java.security.AccessController;
import java.security.AccessControlException;
import java.security.PrivilegedExceptionAction;
import java.security.PrivilegedActionException;
import java.security.SecurityPermission;
import javax.security.jacc.PolicyConfiguration;
import javax.security.jacc.PolicyContextException;
/**
* Abstract factory and finder class for obtaining
* the instance of the class that implements the PolicyConfigurationFactory
* of a provider. The factory will be used to instantiate PolicyConfiguration
* objects that will be used by the deployment tools of the container
* to create and manage policy contexts within the Policy Provider.
* <P>
* Implementation classes must have a public no argument constructor that
* may be used to create an operational instance of the factory implementation
* class.
*
* @see java.security.Permission
* @see javax.security.jacc.PolicyConfiguration
* @see javax.security.jacc.PolicyContextException
*
* @author Ron Monzillo
* @author Gary Ellison
* @author Harpreet Singh
*/
public abstract class PolicyConfigurationFactory
{
private static String FACTORY_NAME =
"javax.security.jacc.PolicyConfigurationFactory.provider";
private static PolicyConfigurationFactory pcFactory;
/**
* This static method uses a system property to find and instantiate
* (via a public constructor) a provider specific factory implementation
* class. The name of the provider specific factory implementation class is
* obtained from the value of the system property,
* <P><code><Pre>
* javax.security.jacc.PolicyConfigurationFactory.provider.
* </Pre></code><P>
*
* @return the singleton instance of the provider specific
* PolicyConfigurationFactory implementation class.
*
* @throws java.lang.SecurityException
* when called by an AccessControlContext that has not been
* granted the "setPolicy" SecurityPermission.
*
* @throws java.lang.ClassNotFoundException
* when the class named by the system property could not be found
* including because the value of the system property has not be set.
*
* @throws javax.security.jacc.PolicyContextException
* if the implementation throws a checked exception that has not been
* accounted for by the getPolicyConfigurationFactory method signature.
* The exception thrown
* by the implementation class will be encapsulated (during construction)
* in the thrown PolicyContextException
*/
public static PolicyConfigurationFactory getPolicyConfigurationFactory()
throws java.lang.ClassNotFoundException,
javax.security.jacc.PolicyContextException
{
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkPermission(new
java.security.SecurityPermission("setPolicy"));
if(pcFactory != null)
return pcFactory;
String msg;
final String classname[] = { null };
try {
Class clazz = null;
if (sm != null){
try{
clazz = (Class)AccessController.doPrivileged
(new PrivilegedExceptionAction(){
public Object run() throws java.lang.Exception{
classname[0] = System.getProperty(FACTORY_NAME);
if(classname[0] == null){
String msg = new String
("JACC:Error PolicyConfigurationFactory : property not set : "+ FACTORY_NAME);
throw new ClassNotFoundException(msg);
}
return Class.forName(classname[0],true,
Thread.currentThread().getContextClassLoader());
}
});
} catch (PrivilegedActionException ex){
Exception e = ex.getException() ;
if ( e instanceof java.lang.ClassNotFoundException){
throw (java.lang.ClassNotFoundException)e;
} else if ( e instanceof java.lang.InstantiationException){
throw (java.lang.InstantiationException)e;
} else if ( e instanceof java.lang.IllegalAccessException){
throw (java.lang.IllegalAccessException)e;
}
}
} else {
classname[0] = System.getProperty(FACTORY_NAME);
if (classname[0] == null){
msg = new String
("JACC:Error PolicyConfigurationFactory : property not set : "+ FACTORY_NAME);
throw new ClassNotFoundException(msg);
}
clazz = Class.forName(classname[0],true,
Thread.currentThread().getContextClassLoader());
}
Object factory = clazz.newInstance();
pcFactory = (PolicyConfigurationFactory) factory;
} catch(java.lang.ClassNotFoundException cnfe){
msg = new String
("JACC:Error PolicyConfigurationFactory : cannot find class : "
+ classname[0]);
throw new ClassNotFoundException(msg,cnfe);
} catch(java.lang.IllegalAccessException iae){
msg = new String
("JACC:Error PolicyConfigurationFactory : cannot access class : "
+ classname[0]);
throw new PolicyContextException(msg,iae);
} catch(java.lang.InstantiationException ie){
msg = new String
("JACC:Error PolicyConfigurationFactory : cannot instantiate : "
+ classname[0]);
throw new PolicyContextException(msg,ie);
} catch(java.lang.ClassCastException cce){
msg = new String
("JACC:Error PolicyConfigurationFactory : class not PolicyConfigurationFactory : "+ classname[0]);
throw new ClassCastException(msg);
}
return pcFactory;
}
/**
* This method is used to obtain an instance of the provider specific
* class that implements the PolicyConfiguration interface that
* corresponds to the identified policy context within the provider.
* The methods of the PolicyConfiguration interface are used to
* define the policy statements of the identified policy context.
* <P>
* If at the time of the call, the identified policy context does not
* exist in the provider, then the policy context will be created
* in the provider and the Object that implements the context's
* PolicyConfiguration Interface will be returned. If the state of the
* identified context is "deleted" or "inService" it will be transitioned to
* the "open" state as a result of the call. The states in the lifecycle
* of a policy context are defined by the PolicyConfiguration interface.
* <P>
* For a given value of policy context identifier, this method
* must always return the same instance of PolicyConfiguration
* and there must be at most one actual instance of a
* PolicyConfiguration with a given policy context identifier
* (during a process context).
* <P>
* To preserve the invariant that there be at most one
* PolicyConfiguration object for a given policy context,
* it may be necessary for this method to be thread safe.
* <P>
* @param contextID A String identifying the policy context whose
* PolicyConfiguration interface is to be returned. The value passed to
* this parameter must not be null.
* <P>
* @param remove A boolean value that establishes whether or not the
* policy statements of an existing policy context are to be
* removed before its PolicyConfiguration object is returned. If the value
* passed to this parameter is true, the policy statements of
* an existing policy context will be removed. If the value is false,
* they will not be removed.
*
* @return an Object that implements the PolicyConfiguration
* Interface matched to the Policy provider and corresponding to the
* identified policy context.
*
* @throws java.lang.SecurityException
* when called by an AccessControlContext that has not been
* granted the "setPolicy" SecurityPermission.
*
* @throws javax.security.jacc.PolicyContextException
* if the implementation throws a checked exception that has not been
* accounted for by the getPolicyConfiguration method signature.
* The exception thrown
* by the implementation class will be encapsulated (during construction)
* in the thrown PolicyContextException.
*/
public abstract PolicyConfiguration
getPolicyConfiguration(String contextID, boolean remove)
throws javax.security.jacc.PolicyContextException;
/**
* This method determines if the identified policy context
* exists with state "inService" in the Policy provider
* associated with the factory.
* <P>
* @param contextID A string identifying a policy context
*
* @return true if the identified policy context exists within the
* provider and its state is "inService", false otherwise.
*
* @throws java.lang.SecurityException
* when called by an AccessControlContext that has not been
* granted the "setPolicy" SecurityPermission.
*
* @throws javax.security.jacc.PolicyContextException
* if the implementation throws a checked exception that has not been
* accounted for by the inService method signature. The exception thrown
* by the implementation class will be encapsulated (during construction)
* in the thrown PolicyContextException.
*/
public abstract boolean inService(String contextID)
throws javax.security.jacc.PolicyContextException;
}