com.att.research.xacmlatt.pdp.std.functions.FunctionDefinitionEquality Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of xacml-pdp Show documentation
Show all versions of xacml-pdp Show documentation
ATT reference implementation of XACML PDP engine
The newest version!
/*
*
* Copyright (c) 2013,2019 AT&T Knowledge Ventures
* SPDX-License-Identifier: MIT
*/
package com.att.research.xacmlatt.pdp.std.functions;
import java.util.ArrayList;
import java.util.List;
import com.att.research.xacml.api.DataType;
import com.att.research.xacml.api.Identifier;
import com.att.research.xacml.api.Status;
import com.att.research.xacml.std.StdStatusCode;
import com.att.research.xacml.std.datatypes.DataTypes;
import com.att.research.xacmlatt.pdp.eval.EvaluationContext;
import com.att.research.xacmlatt.pdp.policy.ExpressionResult;
import com.att.research.xacmlatt.pdp.policy.FunctionArgument;
/**
* FunctionDefinitionEquality extends {@link com.att.research.xacmlatt.pdp.std.functions.FunctionDefinitionHomogeneousSimple} to
* implement the XACML Equality predicates as functions taking two arguments of the same data type and returning a Boolean.
*
* In the first implementation of XACML we had separate files for each XACML Function.
* This release combines multiple Functions in fewer files to minimize code duplication.
* This file supports the following XACML codes:
* string-equal
* boolean-equal
* integer-equal
* double-equal
* date-equal
* time-equal
* dateTime-equal
* dayTimeDuration-equal
* yearMonthDuration-equal
* anyURI-equal
*
* @author car
* @version $Revision: 1.2 $
*
* @param the java class for the data type of the function Input arguments
*/
public class FunctionDefinitionEquality extends FunctionDefinitionHomogeneousSimple {
/**
* Determines if the two T values are equal using the java equals method. Derived classes
* may override this if the equals method is not sufficient.
*
* @param v1 the first object to compare
* @param v2 the second object to compare
* @return true if the two objects are the same, else false
*/
protected boolean isEqual(I v1, I v2) {
return v1.equals(v2);
}
public FunctionDefinitionEquality(Identifier idIn, DataType dataTypeArgsIn) {
super(idIn, DataTypes.DT_BOOLEAN, dataTypeArgsIn, 2);
}
@Override
public ExpressionResult evaluate(EvaluationContext evaluationContext, List arguments) {
List convertedArguments = new ArrayList<>();
Status status = this.validateArguments(arguments, convertedArguments);
/*
* If the function arguments are not correct, just return an error status immediately
*/
if (!status.getStatusCode().equals(StdStatusCode.STATUS_CODE_OK)) {
return ExpressionResult.newError(getFunctionStatus(status));
}
/*
* Now just perform the equality operation.
*/
if (this.isEqual(convertedArguments.get(0), convertedArguments.get(1))) {
return ER_TRUE;
} else {
return ER_FALSE;
}
}
}