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/*-
* ============LICENSE_START=======================================================
* ECOMP-PDP
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.openecomp.policy.xacml.pdp.std.functions;
import java.util.List;
import org.openecomp.policy.common.logging.flexlogger.FlexLogger;
import org.openecomp.policy.common.logging.flexlogger.Logger;
import com.att.research.xacml.api.DataType;
import com.att.research.xacml.api.DataTypeException;
import com.att.research.xacml.api.Identifier;
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;
import com.att.research.xacmlatt.pdp.std.functions.ConvertedArgument;
import com.att.research.xacmlatt.pdp.std.functions.FunctionDefinitionBase;
/**
* FunctionDefinitionCustomRegexMatch implements {@link com.att.research.xacmlatt.pdp.policy.FunctionDefinition} to
* implement the custom 'type'-regex-match predicates as functions taking two arguments, the first of <code>String</code>,
* and the second of the type for that specific predicate as a regular expression,
* and returning a <code>Boolean</code> for whether the regular expression matches the string representation of the first argument.
*
*
* @version $Revision: 0.2 $
*
* @param <I> the java class for the data type of the function Input arguments
*/
public class FunctionDefinitionCustomRegexpMatch<I> extends FunctionDefinitionBase<Boolean, I> {
private static Logger logger = FlexLogger.getLogger(FunctionDefinitionCustomRegexpMatch.class);
/**
* Constructor - need dataTypeArgs input because of java Generic type-erasure during compilation.
*
* @param idIn
* @param dataTypeArgsIn
*/
public FunctionDefinitionCustomRegexpMatch(Identifier idIn, DataType<I> dataTypeArgsIn) {
super(idIn, DataTypes.DT_BOOLEAN, dataTypeArgsIn, false);
}
@Override
public ExpressionResult evaluate(EvaluationContext evaluationContext, List<FunctionArgument> arguments) {
if (arguments == null || arguments.size() != 2) {
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, this.getShortFunctionId() + " Expected 2 arguments, got " +
((arguments == null) ? "null" : arguments.size()) ));
}
// get the regular expression
FunctionArgument regexpArgument = arguments.get(0);
ConvertedArgument<String> convertedArgument = new ConvertedArgument<>(regexpArgument, DataTypes.DT_STRING, false);
if ( ! convertedArgument.isOk()) {
return ExpressionResult.newError(getFunctionStatus(convertedArgument.getStatus()));
}
// String regexpValue = (String)regexpArgument.getValue().getValue();
String regexpValue = convertedArgument.getValue();
// now get the element to match
FunctionArgument elementArgument = arguments.get(1);
ConvertedArgument<I> convertedElement = new ConvertedArgument<>(elementArgument, this.getDataTypeArgs(), false);
if ( ! convertedElement.isOk()) {
return ExpressionResult.newError(getFunctionStatus(convertedElement.getStatus()));
}
I elementValueObject = convertedElement.getValue();
String elementValueString;
try {
elementValueString = this.getDataTypeArgs().toStringValue(elementValueObject);
} catch (DataTypeException e) {
logger.error(e.getMessage() +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));
}
// ConvertedArgument checks for null value, so do not need to do again here
// Adding this code will Change the Functionality which allows to retrieve Multiple-policy using single request.
elementValueString = elementValueString + regexpValue ;
regexpValue = elementValueString.substring(0,(elementValueString.length()- regexpValue.length()));
elementValueString = elementValueString.substring(regexpValue.length(),(elementValueString.length()));
//
// Supporting multiple values in the element and be able to query them.
if(elementValueString.contains(",")){
String[] elements = elementValueString.split(",");
for(int i=0; i<elements.length; i++){
if(elements[i].trim().matches(regexpValue)) {
return ER_TRUE;
}
}
}
if (elementValueString.matches(regexpValue)) {
return ER_TRUE;
} else {
return ER_FALSE;
}
}
}
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