| /* ==================================================================== |
| 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.ErrorEval; |
| import org.apache.poi.ss.formula.eval.EvaluationException; |
| import org.apache.poi.ss.formula.eval.StringEval; |
| import org.apache.poi.ss.formula.eval.ValueEval; |
| |
| /** |
| * An implementation of the Excel REPLACE() function:<p> |
| * Replaces part of a text string based on the number of characters |
| * you specify, with another text string.<br> |
| * |
| * <b>Syntax</b>:<br> |
| * <b>REPLACE</b>(<b>oldText</b>, <b>startNum</b>, <b>numChars</b>, <b>newText</b>)<p> |
| * |
| * <b>oldText</b> The text string containing characters to replace<br> |
| * <b>startNum</b> The position of the first character to replace (1-based)<br> |
| * <b>numChars</b> The number of characters to replace<br> |
| * <b>newText</b> The new text value to replace the removed section<br> |
| * |
| * @author Manda Wilson < wilson at c bio dot msk cc dot org > |
| */ |
| public final class Replace extends Fixed4ArgFunction { |
| |
| public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1, |
| ValueEval arg2, ValueEval arg3) { |
| |
| String oldStr; |
| int startNum; |
| int numChars; |
| String newStr; |
| try { |
| oldStr = TextFunction.evaluateStringArg(arg0, srcRowIndex, srcColumnIndex); |
| startNum = TextFunction.evaluateIntArg(arg1, srcRowIndex, srcColumnIndex); |
| numChars = TextFunction.evaluateIntArg(arg2, srcRowIndex, srcColumnIndex); |
| newStr = TextFunction.evaluateStringArg(arg3, srcRowIndex, srcColumnIndex); |
| } catch (EvaluationException e) { |
| return e.getErrorEval(); |
| } |
| |
| if (startNum < 1 || numChars < 0) { |
| return ErrorEval.VALUE_INVALID; |
| } |
| StringBuilder strBuff = new StringBuilder(oldStr); |
| // remove any characters that should be replaced |
| if (startNum <= oldStr.length() && numChars != 0) { |
| strBuff.delete(startNum - 1, startNum - 1 + numChars); |
| } |
| // now insert (or append) newStr |
| if (startNum > strBuff.length()) { |
| strBuff.append(newStr); |
| } else { |
| strBuff.insert(startNum - 1, newStr); |
| } |
| return new StringEval(strBuff.toString()); |
| } |
| } |