| /* ==================================================================== |
| 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.BlankEval; |
| import org.apache.poi.ss.formula.eval.ErrorEval; |
| import org.apache.poi.ss.formula.eval.EvaluationException; |
| import org.apache.poi.ss.formula.eval.OperandResolver; |
| import org.apache.poi.ss.formula.eval.ValueEval; |
| |
| /** |
| * Implementation of the DGet function: |
| * Finds the value of a column in an area with given conditions. |
| */ |
| public final class DGet implements IDStarAlgorithm { |
| private ValueEval result; |
| |
| @Override |
| public boolean processMatch(ValueEval eval) { |
| if(result == null) // First match, just set the value. |
| { |
| result = eval; |
| } |
| else // There was a previous match. Only one non-blank result is allowed. #NUM! on multiple values. |
| { |
| if(result instanceof BlankEval) { |
| result = eval; |
| } |
| else { |
| // We have a previous filled result. |
| if(!(eval instanceof BlankEval)) { |
| result = ErrorEval.NUM_ERROR; |
| return false; |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public ValueEval getResult() { |
| if(result == null) { |
| return ErrorEval.VALUE_INVALID; |
| } else if(result instanceof BlankEval) { |
| return ErrorEval.VALUE_INVALID; |
| } else |
| try { |
| if(OperandResolver.coerceValueToString(OperandResolver.getSingleValue(result, 0, 0)).isEmpty()) { |
| return ErrorEval.VALUE_INVALID; |
| } |
| else { |
| return result; |
| } |
| } catch (EvaluationException e) { |
| return e.getErrorEval(); |
| } |
| } |
| } |