67 lines
2.4 KiB
Java
67 lines
2.4 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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http://www.apache.org/licenses/LICENSE-2.0
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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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package org.apache.poi.ss.formula.functions;
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import org.apache.poi.ss.formula.eval.BlankEval;
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import org.apache.poi.ss.formula.eval.ErrorEval;
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import org.apache.poi.ss.formula.eval.EvaluationException;
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import org.apache.poi.ss.formula.eval.OperandResolver;
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import org.apache.poi.ss.formula.eval.ValueEval;
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/**
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* Implementation of the DGet function:
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* Finds the value of a column in an area with given conditions.
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*/
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public final class DGet implements IDStarAlgorithm {
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private ValueEval result;
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@Override
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public boolean processMatch(ValueEval eval) {
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if(result == null) // First match, just set the value.
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{
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result = eval;
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}
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else // There was a previous match, since there is only exactly one allowed, bail out.
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{
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result = ErrorEval.NUM_ERROR;
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return false;
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}
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return true;
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}
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@Override
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public ValueEval getResult() {
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if(result == null) {
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return ErrorEval.VALUE_INVALID;
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} else if(result instanceof BlankEval) {
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return ErrorEval.VALUE_INVALID;
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} else
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try {
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if(OperandResolver.coerceValueToString(OperandResolver.getSingleValue(result, 0, 0)).equals("")) {
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return ErrorEval.VALUE_INVALID;
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}
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else {
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return result;
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}
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} catch (EvaluationException e) {
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return e.getErrorEval();
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}
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}
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}
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