88 lines
3.0 KiB
Java
88 lines
3.0 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Created on May 15, 2005
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*
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*/
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package org.apache.poi.hssf.record.formula.functions;
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import org.apache.poi.hssf.record.formula.eval.BlankEval;
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import org.apache.poi.hssf.record.formula.eval.ErrorEval;
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import org.apache.poi.hssf.record.formula.eval.Eval;
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import org.apache.poi.hssf.record.formula.eval.NumberEval;
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import org.apache.poi.hssf.record.formula.eval.NumericValueEval;
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import org.apache.poi.hssf.record.formula.eval.ValueEval;
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/**
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* @author Amol S. Deshmukh < amolweb at ya hoo dot com >
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*
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*/
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public class Combin extends NumericFunction {
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public Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
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double d0 = 0;
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double d1 = 0;
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ValueEval retval = null;
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switch (operands.length) {
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default:
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retval = ErrorEval.VALUE_INVALID;
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break;
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case 2:
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ValueEval ve = singleOperandEvaluate(operands[0], srcRow, srcCol);
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if (ve instanceof NumericValueEval) {
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NumericValueEval ne = (NumericValueEval) ve;
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d0 = ne.getNumberValue();
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}
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else if (ve instanceof BlankEval) {
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// do nothing
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}
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else {
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retval = ErrorEval.NUM_ERROR;
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}
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if (retval == null) {
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ve = singleOperandEvaluate(operands[1], srcRow, srcCol);
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if (ve instanceof NumericValueEval) {
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NumericValueEval ne = (NumericValueEval) ve;
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d1 = ne.getNumberValue();
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}
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else if (ve instanceof BlankEval) {
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// do nothing
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}
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else {
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retval = ErrorEval.NUM_ERROR;
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}
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}
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}
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if (retval == null) {
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if (d0 > Integer.MAX_VALUE || d1 > Integer.MAX_VALUE) {
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retval = ErrorEval.NUM_ERROR;
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}
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else {
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double d = MathX.nChooseK((int) d0, (int) d1);
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retval = (Double.isNaN(d) || Double.isInfinite(d))
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? (ValueEval) ErrorEval.NUM_ERROR
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: new NumberEval(d);
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}
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}
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return retval;
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}
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}
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