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ATT reference implementation of XACML PDP engine
/*
*
* 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.StdStatus;
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;
/**
* FunctionDefinitionComparison implements {@link com.att.research.xacmlatt.pdp.policy.FunctionDefinition} to
* implement the XACML comparison predicates as functions taking two arguments of the same 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:
* integer-greater-than
* integer-greater-than-or-equal
* integer-less-than
* integer-less-than-or-equal
* double-greater-than
* double-greater-than-or-equal
* double-less-than
* double-less-than-or-equal
*
*
* @author glenngriffin
* @version $Revision: 1.1 $
*
* @param the java class for the data type of the function Input arguments
*/
public class FunctionDefinitionComparison> extends FunctionDefinitionHomogeneousSimple {
/**
* List of comparison operations.
*
* @author glenngriffin
*
*/
public enum OPERATION {GREATER_THAN, GREATER_THAN_EQUAL, LESS_THAN, LESS_THAN_EQUAL };
// the operation for this instance of the class
private OPERATION operation;
/**
* Constructor - need dataType input because of java Generic type-erasure during compilation.
*
* @param idIn
* @param dataTypeArgsIn
* @param opIn
*/
public FunctionDefinitionComparison(Identifier idIn, DataType dataTypeArgsIn, OPERATION opIn) {
super(idIn, DataTypes.DT_BOOLEAN, dataTypeArgsIn, 2);
operation = opIn;
}
@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));
}
int compareResult;
try {
compareResult = ((I)convertedArguments.get(0)).compareTo((I)convertedArguments.get(1));
} catch (Exception e) {
String message = e.getMessage();
if (e.getCause() != null) {
message = e.getCause().getMessage();
}
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, this.getShortFunctionId() + " " + message));
}
switch (operation) {
case GREATER_THAN:
if (compareResult > 0) {
return ER_TRUE;
} else {
return ER_FALSE;
}
case GREATER_THAN_EQUAL:
if (compareResult > -1) {
return ER_TRUE;
} else {
return ER_FALSE;
}
case LESS_THAN:
if (compareResult < 0) {
return ER_TRUE;
} else {
return ER_FALSE;
}
case LESS_THAN_EQUAL:
if (compareResult < 1) {
return ER_TRUE;
} else {
return ER_FALSE;
}
}
// switch on enum should handle everything - should never get here
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, this.getShortFunctionId() + " ENUM did not cover case of " + operation));
}
}