org.jboss.security.xacml.sunxacml.cond
Class SubtractFunction

java.lang.Object
  org.jboss.security.xacml.sunxacml.cond.FunctionBase
      org.jboss.security.xacml.sunxacml.cond.SubtractFunction

All Implemented Interfaces:

Expression, Function

public class SubtractFunction
extends FunctionBase

A class that implements all the *-subtract functions. It takes two operands of the appropriate type and returns the difference of the operands. If either of the operands is indeterminate, an indeterminate result is returned.

Since:

1.0

Author:

Steve Hanna, Seth Proctor

Field Summary

static String	NAME_DOUBLE_SUBTRACT Standard identifier for the integer-subtract function.
static String	NAME_INTEGER_SUBTRACT Standard identifier for the integer-subtract function.

Fields inherited from class org.jboss.security.xacml.sunxacml.cond.FunctionBase

FUNCTION_NS, FUNCTION_NS_2

Constructor Summary

SubtractFunction(String functionName)
Creates a new SubtractFunction object.

Method Summary

EvaluationResult	evaluate(List inputs, EvaluationCtx context) Evaluate the function, using the specified parameters.
static Set	getSupportedIdentifiers() Returns a Set containing all the function identifiers supported by this class.

Methods inherited from class org.jboss.security.xacml.sunxacml.cond.FunctionBase

checkInputs, checkInputsNoBag, encode, encode, evalArgs, getFunctionId, getFunctionName, getIdentifier, getReturnType, getReturnTypeAsString, getType, makeProcessingError, returnsBag

Methods inherited from class java.lang.Object

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

Field Detail

NAME_INTEGER_SUBTRACT

public static final String NAME_INTEGER_SUBTRACT

Standard identifier for the integer-subtract function.

See Also:

Constant Field Values

NAME_DOUBLE_SUBTRACT

public static final String NAME_DOUBLE_SUBTRACT

Standard identifier for the integer-subtract function.

See Also:

Constant Field Values

Constructor Detail

SubtractFunction

public SubtractFunction(String functionName)

Creates a new SubtractFunction object.

Parameters:

functionName - the standard XACML name of the function to be handled by this object, including the full namespace

Throws:

IllegalArgumentException - if the function is unknown

Method Detail

getSupportedIdentifiers

public static Set getSupportedIdentifiers()

Returns a Set containing all the function identifiers supported by this class.

Returns:

a Set of Strings

evaluate

public EvaluationResult evaluate(List inputs,
                                 EvaluationCtx context)

Evaluate the function, using the specified parameters.

Parameters:

inputs - a List of Evaluatable objects representing the arguments passed to the function

context - an EvaluationCtx so that the Evaluatable objects can be evaluated

Returns:

an EvaluationResult representing the function's result