issrg.pba.rbac.xmlpolicy.ifstatement
Class LeNode

java.lang.Object
  issrg.pba.rbac.xmlpolicy.PolicyXMLNode
      issrg.pba.rbac.xmlpolicy.ifstatement.TermNode
          issrg.pba.rbac.xmlpolicy.ifstatement.OperationNode
              issrg.pba.rbac.xmlpolicy.ifstatement.LeNode

All Implemented Interfaces:

Term

public class LeNode
extends OperationNode

This is the class for LE node of the IF-statement. Its functionality is very much determined by OperationNode, which is configured to deliver the following semantics:

This operation expects two and only two Terms of any type, and returns a value of type Types.BOOLEAN_TYPE. The evaluation result is "true", if and only if there is an interpreter for the required set of Terms, and it evaluates that the first Term is less than or equal to the second Term.

It is possible to register the interpreters for specific combinations of Terms. Use registerInterpreter method to do that. There is no default Interpreter.

Author:

A.Otenko

See Also:

registerInterpreter(issrg.pba.rbac.xmlpolicy.ifstatement.Interpreter)

Field Summary

static java.lang.String

LE_NODE

Fields inherited from class issrg.pba.rbac.xmlpolicy.ifstatement.OperationNode

interpreter, type

Fields inherited from class issrg.pba.rbac.xmlpolicy.ifstatement.TermNode

maxOperand, minOperand, terms

Fields inherited from class issrg.pba.rbac.xmlpolicy.PolicyXMLNode

attributes, children, name, nodeStr

Constructor Summary

protected	LeNode()
	LeNode(XMLPolicyParser p, org.xml.sax.Attributes attrs) This constructor builds a LeNode given the XMLPolicyParser and the set of attributes of this XML element.

Method Summary

static void	register() Call this method to register this node with the XMLPolicyParser.
static void	registerInterpreter(Interpreter i) This method maintains a register of interpreters for specific combinations of Terms.

Methods inherited from class issrg.pba.rbac.xmlpolicy.ifstatement.OperationNode

construct, evaluate, getType

Methods inherited from class issrg.pba.rbac.xmlpolicy.ifstatement.TermNode

getInterpretersForNode, registerInterpreterForNode

Methods inherited from class issrg.pba.rbac.xmlpolicy.PolicyXMLNode

addChild, addString, getAttributes, getChildren, getName, getString, toString, toXML, toXML

Methods inherited from class java.lang.Object

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

Field Detail

LE_NODE

public static final java.lang.String LE_NODE

See Also:

Constant Field Values

Constructor Detail

LeNode

protected LeNode()

LeNode

public LeNode(XMLPolicyParser p,
              org.xml.sax.Attributes attrs)

This constructor builds a LeNode given the XMLPolicyParser and the set of attributes of this XML element. It expects that there are two and only two child nodes.

Parameters:

p - - the XMLPolicyParser that builds this LeNode

attr - - the attributes of this XML element

Method Detail

register

public static void register()

Call this method to register this node with the XMLPolicyParser.

registerInterpreter

public static void registerInterpreter(Interpreter i)

This method maintains a register of interpreters for specific combinations of Terms. If no special interpreters are registered, the evaluation error occurs. The semantics of the interpreters should make sure that the first Term is less or equal to the second Term in the array passed to the evaluate method of that Interpreter.

Parameters:

i - - the Interpreter instance that can evaluate inequality expression for some combination of Terms

See Also:

Interpreter.evaluate(issrg.pba.rbac.xmlpolicy.ifstatement.Environment, issrg.pba.rbac.xmlpolicy.ifstatement.Term[])