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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.functions;
-
- import org.apache.poi.hssf.record.formula.eval.AreaEval;
- import org.apache.poi.hssf.record.formula.eval.BlankEval;
- import org.apache.poi.hssf.record.formula.eval.ErrorEval;
- import org.apache.poi.hssf.record.formula.eval.NumberEval;
- import org.apache.poi.hssf.record.formula.eval.RefEval;
- import org.apache.poi.hssf.record.formula.eval.ValueEval;
- import org.apache.poi.hssf.record.formula.functions.CountUtils.I_MatchPredicate;
-
- /**
- * Implementation for the function COUNTBLANK
- * <p>
- * Syntax: COUNTBLANK ( range )
- * <table border="0" cellpadding="1" cellspacing="0" summary="Parameter descriptions">
- * <tr><th>range </th><td>is the range of cells to count blanks</td></tr>
- * </table>
- * </p>
- *
- * @author Mads Mohr Christensen
- */
- public final class Countblank implements Function {
-
- public ValueEval evaluate(ValueEval[] args, int srcRowIndex, short srcColumnIndex) {
- if (args.length != 1) {
- // TODO - it doesn't seem to be possible to enter COUNTBLANK() into Excel with the wrong arg count
- // perhaps this should be an exception
- return ErrorEval.VALUE_INVALID;
- }
-
- double result;
- ValueEval arg0 = args[0];
- if (arg0 instanceof RefEval) {
- result = CountUtils.countMatchingCell((RefEval) arg0, predicate);
- } else if (arg0 instanceof AreaEval) {
- result = CountUtils.countMatchingCellsInArea((AreaEval) arg0, predicate);
- } else {
- throw new IllegalArgumentException("Bad range arg type (" + arg0.getClass().getName() + ")");
- }
- return new NumberEval(result);
- }
-
- private static final I_MatchPredicate predicate = new I_MatchPredicate() {
-
- public boolean matches(ValueEval valueEval) {
- // Note - only BlankEval counts
- return valueEval == BlankEval.INSTANCE;
- }
- };
- }
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