issrg.pba.rbac.xmlpolicy.ifstatement
Class PresentNode

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.PresentNode

All Implemented Interfaces:

Term

public class PresentNode
extends OperationNode

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

This operation expects one and only one Term, which must either be an ArgNode or EnvironmentNode and returns a value of type Types.BOOLEAN_TYPE. The evaluation result is "true", if and only if the Term refers to an argument or environmental variable that is present in the current Environment.

Author:

A.Otenko

Field Summary

static java.lang.String

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

Method Summary

void	construct() This method checks that there is only one child element in XML, and that it is of type ArgNode or EnvironmentNode to ensure the semantic correctness of XML policy.
static void	register() Call this method to register the PresentNode with the XMLPolicyParser.

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

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

PRESENT_NODE

public static final java.lang.String PRESENT_NODE

See Also:

Constant Field Values

Constructor Detail

PresentNode

protected PresentNode()

PresentNode

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

This constructor builds a PresentNode given the XMLPolicyParser and the set of attributes of this XML element. It expects that there is one and only one child node.

Parameters:

p - - the XMLPolicyParser that builds this PresentNode

attrs - - the attributes of this XML element

Method Detail

register

public static void register()

Call this method to register the PresentNode with the XMLPolicyParser. It also registers the default PresentInterpreter.

construct

public void construct()
               throws PolicyParsingException

This method checks that there is only one child element in XML, and that it is of type ArgNode or EnvironmentNode to ensure the semantic correctness of XML policy.

Overrides:

construct in class OperationNode

Throws:

PolicyParsingException - if one of the above-stated conditions is violated