/*
* 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 java.math.BigDecimal;
import java.util.Arrays;
import java.util.List;
import org.kie.dmn.api.feel.runtime.events.FEELEvent;
import org.kie.dmn.api.feel.runtime.events.FEELEvent.Severity;
import org.kie.dmn.feel.runtime.events.InvalidParametersEvent;
import org.kie.dmn.feel.runtime.functions.FEELFnResult;
import org.kie.dmn.feel.util.EvalHelper;
public class SumFunction
extends BaseFEELFunction {
public SumFunction() {
super( "sum" );
}
public FEELFnResult<BigDecimal> invoke(@ParameterName("list") List list) {
BigDecimal sum = BigDecimal.ZERO;
for ( Object element : list ) {
if ( element instanceof BigDecimal ) {
sum = sum.add( (BigDecimal) element );
} else if ( element instanceof Number ) {
sum = sum.add( EvalHelper.getBigDecimalOrNull( element ) );
} else {
return FEELFnResult.ofError(new InvalidParametersEvent(Severity.ERROR, "list", "an element in the list is not suitable for the sum"));
}
}
return FEELFnResult.ofResult( sum );
}
public FEELFnResult<BigDecimal> invoke(@ParameterName("list") Number single) {
if ( single == null ) {
// Arrays.asList does not accept null as parameter
return FEELFnResult.ofError(new InvalidParametersEvent(Severity.ERROR, "list", "the single value list cannot be null"));
}
if( single instanceof BigDecimal ) {
return FEELFnResult.ofResult((BigDecimal) single );
}
BigDecimal result = EvalHelper.getBigDecimalOrNull( single );
if ( result != null ) {
return FEELFnResult.ofResult( result );
} else {
return FEELFnResult.ofError(new InvalidParametersEvent(Severity.ERROR, "list", "single element in list not a number"));
}
}
public FEELFnResult<BigDecimal> invoke(@ParameterName("n") Object[] list) {
if ( list == null ) {
// Arrays.asList does not accept null as parameter
return FEELFnResult.ofError(new InvalidParametersEvent(Severity.ERROR, "n", "the single value list cannot be null"));
}
return invoke( Arrays.asList( list ) );
}
}