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- /* ====================================================================
- Licensed to the Apache Software Foundation (ASF) under one or more
- contributor license agreements. See the NOTICE file distributed with
- this work for additional information regarding copyright ownership.
- The ASF licenses this file to You 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.apache.poi.ss.formula.functions;
-
- import org.apache.poi.ss.formula.TwoDEval;
- import org.apache.poi.ss.formula.eval.ErrorEval;
- import org.apache.poi.ss.formula.eval.EvaluationException;
- import org.apache.poi.ss.formula.eval.NumberEval;
- import org.apache.poi.ss.formula.eval.ValueEval;
-
- import java.util.Arrays;
-
- /**
- * Calculates the net present value of an investment by using a discount rate
- * and a series of future payments (negative values) and income (positive
- * values). Minimum 2 arguments, first arg is the rate of discount over the
- * length of one period others up to 254 arguments representing the payments and
- * income.
- *
- * @author SPetrakovsky
- * @author Marcel May
- */
- public final class Npv implements Function {
-
- public ValueEval evaluate(ValueEval[] args, int srcRowIndex, int srcColumnIndex) {
- int nArgs = args.length;
- if (nArgs < 2) {
- return ErrorEval.VALUE_INVALID;
- }
-
- try {
- double rate = NumericFunction.singleOperandEvaluate(args[0], srcRowIndex, srcColumnIndex);
- // convert tail arguments into an array of doubles
- ValueEval[] vargs = Arrays.copyOfRange(args, 1 , args.length);
- double[] values = AggregateFunction.ValueCollector.collectValues(vargs);
-
- double result = FinanceLib.npv(rate, values);
- NumericFunction.checkValue(result);
- return new NumberEval(result);
- } catch (EvaluationException e) {
- return e.getErrorEval();
- }
- }
- }
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