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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.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, since there is only exactly one allowed, bail out.
- {
- 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)).equals("")) {
- return ErrorEval.VALUE_INVALID;
- }
- else {
- return result;
- }
- } catch (EvaluationException e) {
- return e.getErrorEval();
- }
- }
- }
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