/* ==================================================================== | |
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.excelant.util; | |
import java.util.HashMap; | |
import java.util.Map; | |
/** | |
* This is a factory class maps file names to WorkbookUtil instances. This | |
* helps ExcelAnt be more efficient when being run many times in an Ant build. | |
* | |
* @author Jon Svede (jon [at] loquatic [dot] com) | |
* @author Brian Bush (brian [dot] bush [at] nrel [dot] gov) | |
* | |
*/ | |
public final class ExcelAntWorkbookUtilFactory { | |
private static Map<String, ExcelAntWorkbookUtil> workbookUtilMap; | |
private ExcelAntWorkbookUtilFactory() { | |
} | |
/** | |
* Using the fileName, check the internal map to see if an instance | |
* of the WorkbookUtil exists. If not, then add an instance to the map. | |
* | |
* @param fileName The filename to use as key to look for the ExcelAntWorkbookUtil. | |
* @return An instance of ExcelAntWorkbookUtil associated with the filename or | |
* a freshly instantiated one if none did exist before. | |
*/ | |
public static ExcelAntWorkbookUtil getInstance(String fileName) { | |
if(workbookUtilMap == null) { | |
workbookUtilMap = new HashMap<String, ExcelAntWorkbookUtil>(); | |
} | |
if(workbookUtilMap.containsKey(fileName)) { | |
return workbookUtilMap.get(fileName); | |
} | |
ExcelAntWorkbookUtil wbu = new ExcelAntWorkbookUtil(fileName); | |
workbookUtilMap.put(fileName, wbu); | |
return wbu; | |
} | |
} |