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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.OperationEvaluationContext;
- import org.apache.poi.ss.formula.eval.*;
-
- /**
- * Implementation for Excel HEX2DEC() function.<p/>
- * <p/>
- * <b>Syntax</b>:<br/> <b>HEX2DEC </b>(<b>number</b>)<br/>
- * <p/>
- * Converts a hexadecimal number to decimal.
- * <p/>
- * Number is the hexadecimal number you want to convert. Number cannot contain more than 10 characters (40 bits).
- * The most significant bit of number is the sign bit.
- * The remaining 39 bits are magnitude bits. Negative numbers are represented using two's-complement notation.
- * Remark
- * If number is not a valid hexadecimal number, HEX2DEC returns the #NUM! error value.
- *
- * @author cedric dot walter @ gmail dot com
- */
- public class Hex2Dec extends Fixed1ArgFunction implements FreeRefFunction {
-
- public static final FreeRefFunction instance = new Hex2Dec();
-
- static final int HEXADECIMAL_BASE = 16;
- static final int MAX_NUMBER_OF_PLACES = 10;
-
- public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval numberVE) {
- final String hex;
- if (numberVE instanceof RefEval) {
- RefEval re = (RefEval) numberVE;
- hex = OperandResolver.coerceValueToString(re.getInnerValueEval(re.getFirstSheetIndex()));
- } else {
- hex = OperandResolver.coerceValueToString(numberVE);
- }
- try {
- return new NumberEval(BaseNumberUtils.convertToDecimal(hex, HEXADECIMAL_BASE, MAX_NUMBER_OF_PLACES));
- } catch (IllegalArgumentException e) {
- return ErrorEval.NUM_ERROR;
- }
- }
-
- public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) {
- if (args.length != 1) {
- return ErrorEval.VALUE_INVALID;
- }
- return evaluate(ec.getRowIndex(), ec.getColumnIndex(), args[0]);
- }
- }
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