/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates.
*
* 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.
*/
package org.kie.dmn.feel.runtime.functions;
import org.kie.dmn.api.feel.runtime.events.FEELEvent.Severity;
import org.kie.dmn.feel.runtime.events.InvalidParametersEvent;
/**
* The not() function is a special case because
* it doubles both as a function and as a unary
* test.
*/
public class NotFunction
extends BaseFEELFunction {
public NotFunction() {
super( "not" );
}
public FEELFnResult<Boolean> invoke(@ParameterName("negand") Object negand) {
if ( negand != null && !(negand instanceof Boolean) ) {
return FEELFnResult.ofError( new InvalidParametersEvent( Severity.ERROR, "negand", "must be a boolean value" ) );
}
return FEELFnResult.ofResult( negand == null ? null : !((Boolean) negand).booleanValue() );
}
}