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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.hssf.record.formula.atp;
-
- import org.apache.poi.hssf.record.formula.eval.ErrorEval;
- import org.apache.poi.hssf.record.formula.eval.EvaluationException;
- import org.apache.poi.hssf.record.formula.eval.NumberEval;
- import org.apache.poi.hssf.record.formula.eval.OperandResolver;
- import org.apache.poi.hssf.record.formula.eval.ValueEval;
- import org.apache.poi.hssf.record.formula.functions.FreeRefFunction;
- import org.apache.poi.ss.formula.OperationEvaluationContext;
-
- /**
- * Implementation of Excel 'Analysis ToolPak' function RANDBETWEEN()<br/>
- *
- * Returns a random integer number between the numbers you specify.<p/>
- *
- * <b>Syntax</b><br/>
- * <b>RANDBETWEEN</b>(<b>bottom</b>, <b>top</b>)<p/>
- *
- * <b>bottom</b> is the smallest integer RANDBETWEEN will return.<br/>
- * <b>top</b> is the largest integer RANDBETWEEN will return.<br/>
-
- * @author Brendan Nolan
- */
- final class RandBetween implements FreeRefFunction{
-
- public static final FreeRefFunction instance = new RandBetween();
-
- private RandBetween() {
- //enforces singleton
- }
-
- /**
- * Evaluate for RANDBETWEEN(). Must be given two arguments. Bottom must be greater than top.
- * Bottom is rounded up and top value is rounded down. After rounding top has to be set greater
- * than top.
- *
- * @see org.apache.poi.hssf.record.formula.functions.FreeRefFunction#evaluate(org.apache.poi.hssf.record.formula.eval.ValueEval[], org.apache.poi.ss.formula.OperationEvaluationContext)
- */
- @Override
- public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) {
-
- double bottom, top;
-
- if (args.length != 2) {
- return ErrorEval.VALUE_INVALID;
- }
-
- try {
- bottom = OperandResolver.coerceValueToDouble(OperandResolver.getSingleValue(args[0], ec.getRowIndex(), ec.getColumnIndex()));
- top = OperandResolver.coerceValueToDouble(OperandResolver.getSingleValue(args[1], ec.getRowIndex(), ec.getColumnIndex()));
- if(bottom > top) {
- return ErrorEval.NUM_ERROR;
- }
- } catch (EvaluationException e) {
- return ErrorEval.VALUE_INVALID;
- }
-
- bottom = Math.ceil(bottom);
- top = Math.floor(top);
-
- if(bottom > top) {
- top = bottom;
- }
-
- return new NumberEval((bottom + (int)(Math.random() * ((top - bottom) + 1))));
-
- }
-
- }
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