issrg.pba.rbac.xmlpolicy.ifstatement
Class EqNode

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.EqNode

All Implemented Interfaces:

Term

public class EqNode
extends OperationNode

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

This operation expects two and only two Terms of the same type, and returns a value of type Types.BOOLEAN_TYPE. The evaluation result is "true", if and only if calling equals() method on the first term returns boolean "true".

It is possible to register equality interpreters for specific combinations of Terms, which will be used in preference to the default EqInterpreter. Use registerInterpreter method to do that.

Author:

A.Otenko

See Also:

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

Field Summary

static java.lang.String

EQ_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	EqNode()
	EqNode(XMLPolicyParser p, org.xml.sax.Attributes attrs) This constructor builds an EqNode given the XMLPolicyParser and the set of attributes of this XML element.

Method Summary

static void	register() Call this method to register the EqNode 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

EQ_NODE

public static final java.lang.String EQ_NODE

See Also:

Constant Field Values

Constructor Detail

EqNode

protected EqNode()

EqNode

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

This constructor builds an EqNode 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 EqNode

attr - - the attributes of this XML element

Method Detail

register

public static void register()

Call this method to register the EqNode with the XMLPolicyParser. It also registers the default EqInterpreter.

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 default one is used, as described above.

Parameters:

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