XGTRBAC
Class LogicalExpr

java.lang.Object
  XGTRBAC.LogicalExpr

public class LogicalExpr
extends java.lang.Object

This class contains methods and members for evaluating logical expressions. It is instantiated in [XURAS/XPRAS]_DTDScanner class (setLogicalExpr/addPredicate method).

Nested Class Summary

class	LogicalExpr.Parameter An inner "Parameter" class *
class	LogicalExpr.SimplePredicate An inner "SimplePredicate" class *

Field Summary

private java.lang.String	opcode
private java.util.LinkedList	PredicateList

Constructor Summary

LogicalExpr()
Creates a new instance of LogicalExpr

Method Summary

java.lang.Object	addPredicate(int type) Adds a new predicate to the PredicateList
boolean	evaluate(java.lang.Object subject, java.lang.String cred_type) Evaluates the logical expression given a credential type
java.lang.String	getOpcode() Returns the opcode
java.lang.Object	getPredicate(int index) Returns the predicate of the logical expression
int	getPredicateCount() Returns the number of predicates for this logical expression
boolean	getResult(boolean[] status) Returns the result for a logical expression evaluation
void	setOpcode(java.lang.String op) Sets the opcode

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

opcode

private java.lang.String opcode

PredicateList

private java.util.LinkedList PredicateList

Constructor Detail

LogicalExpr

public LogicalExpr()

Creates a new instance of LogicalExpr

Method Detail

getOpcode

public java.lang.String getOpcode()

Returns the opcode

Returns:

The opcode as String

setOpcode

public void setOpcode(java.lang.String op)

Sets the opcode

Parameters:

op - The opcode supplied as String

getPredicateCount

public int getPredicateCount()

Returns the number of predicates for this logical expression

Returns:

The predicate count as int

getPredicate

public java.lang.Object getPredicate(int index)

Returns the predicate of the logical expression

Parameters:

index - The integer index of the credential condition in the AssignConditionList

Returns:

The predicate as Object

addPredicate

public java.lang.Object addPredicate(int type)

Adds a new predicate to the PredicateList

Parameters:

type - The type of the predicate (0:simple predicate, 1: logical expression)

Returns:

The reference to the added predicate as Object

evaluate

public boolean evaluate(java.lang.Object subject,
                        java.lang.String cred_type)
                 throws java.lang.Exception

Evaluates the logical expression given a credential type

Parameters:

subject - The subject of evaluation (User or Role) supplied as Object

cred_type - The credential type name supplied as String

Returns:

The evaluation status as boolean

Throws:

java.lang.Exception

getResult

public boolean getResult(boolean[] status)

Returns the result for a logical expression evaluation

Parameters:

status - The status array supplied as boolean[]

Returns:

The result as boolean