| /* ==================================================================== |
| 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.eval.NumberEval; |
| import org.apache.poi.ss.formula.eval.NumericValueEval; |
| import org.apache.poi.ss.formula.eval.ValueEval; |
| |
| /** |
| * Implementation of the DMin function: |
| * Finds the minimum value of a column in an area with given conditions. |
| * |
| * TODO: |
| * - wildcards ? and * in string conditions |
| * - functions as conditions |
| */ |
| public final class DMin implements IDStarAlgorithm { |
| private ValueEval minimumValue; |
| |
| @Override |
| public boolean processMatch(ValueEval eval) { |
| if(eval instanceof NumericValueEval) { |
| if(minimumValue == null) { // First match, just set the value. |
| minimumValue = eval; |
| } else { // There was a previous match, find the new minimum. |
| double currentValue = ((NumericValueEval)eval).getNumberValue(); |
| double oldValue = ((NumericValueEval)minimumValue).getNumberValue(); |
| if(currentValue < oldValue) { |
| minimumValue = eval; |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public ValueEval getResult() { |
| if(minimumValue == null) { |
| return NumberEval.ZERO; |
| } else { |
| return minimumValue; |
| } |
| } |
| } |