| /* ==================================================================== |
| 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 SUBSTITUTE function:<p> |
| * Substitutes text in a text string with new text, some number of times. |
| * @author Manda Wilson < wilson at c bio dot msk cc dot org > |
| */ |
| public final class Substitute extends Var3or4ArgFunction { |
| |
| public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1, |
| ValueEval arg2) { |
| String result; |
| try { |
| String oldStr = TextFunction.evaluateStringArg(arg0, srcRowIndex, srcColumnIndex); |
| String searchStr = TextFunction.evaluateStringArg(arg1, srcRowIndex, srcColumnIndex); |
| String newStr = TextFunction.evaluateStringArg(arg2, srcRowIndex, srcColumnIndex); |
| |
| result = replaceAllOccurrences(oldStr, searchStr, newStr); |
| } catch (EvaluationException e) { |
| return e.getErrorEval(); |
| } |
| return new StringEval(result); |
| } |
| |
| public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1, |
| ValueEval arg2, ValueEval arg3) { |
| String result; |
| try { |
| String oldStr = TextFunction.evaluateStringArg(arg0, srcRowIndex, srcColumnIndex); |
| String searchStr = TextFunction.evaluateStringArg(arg1, srcRowIndex, srcColumnIndex); |
| String newStr = TextFunction.evaluateStringArg(arg2, srcRowIndex, srcColumnIndex); |
| |
| int instanceNumber = TextFunction.evaluateIntArg(arg3, srcRowIndex, srcColumnIndex); |
| if (instanceNumber < 1) { |
| return ErrorEval.VALUE_INVALID; |
| } |
| result = replaceOneOccurrence(oldStr, searchStr, newStr, instanceNumber); |
| } catch (EvaluationException e) { |
| return e.getErrorEval(); |
| } |
| return new StringEval(result); |
| } |
| |
| private static String replaceAllOccurrences(String oldStr, String searchStr, String newStr) { |
| // avoid endless loop when searching for nothing |
| if (searchStr.length() < 1) { |
| return oldStr; |
| } |
| |
| StringBuilder sb = new StringBuilder(); |
| int startIndex = 0; |
| while (true) { |
| int nextMatch = oldStr.indexOf(searchStr, startIndex); |
| if (nextMatch < 0) { |
| // store everything from end of last match to end of string |
| sb.append(oldStr.substring(startIndex)); |
| return sb.toString(); |
| } |
| // store everything from end of last match to start of this match |
| sb.append(oldStr, startIndex, nextMatch); |
| sb.append(newStr); |
| startIndex = nextMatch + searchStr.length(); |
| } |
| } |
| |
| private static String replaceOneOccurrence(String oldStr, String searchStr, String newStr, int instanceNumber) { |
| // avoid endless loop when searching for nothing |
| if (searchStr.length() < 1) { |
| return oldStr; |
| } |
| int startIndex = 0; |
| int count=0; |
| while (true) { |
| int nextMatch = oldStr.indexOf(searchStr, startIndex); |
| if (nextMatch < 0) { |
| // not enough occurrences found - leave unchanged |
| return oldStr; |
| } |
| count++; |
| if (count == instanceNumber) { |
| return oldStr.substring(0, nextMatch) + |
| newStr + |
| oldStr.substring(nextMatch + searchStr.length()); |
| } |
| startIndex = nextMatch + searchStr.length(); |
| } |
| } |
| } |