poi/src/test/java/org/apache/poi/ss/ITestDataProvider.java

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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
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package org.apache.poi.ss;

import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;

/**
 * Encapsulates a provider of test data for common HSSF / XSSF tests.
 */
public interface ITestDataProvider {
    /**
     * Provides HSSF / XSSF specific way for re-serialising a workbook
     *
     * @param wb the workbook to re-serialize
     * @return the re-serialized workbook
     */
    Workbook writeOutAndReadBack(Workbook wb);

    /**
     * Provides way of loading HSSF / XSSF sample workbooks
     *
     * @param sampleFileName the file name to load
     * @return an instance of Workbook loaded from the supplied file name
     */
    Workbook openSampleWorkbook(String sampleFileName);

    /**
     * Provides way of creating HSSF / XSSF workbooks
     * @return an instance of Workbook
     */
    Workbook createWorkbook();


    //************ SXSSF-specific methods ***************//
    /**
     * Provides way of creating a SXSSFWorkbook with a specific row access window size.
     * Equivalent to createWorkbook on others.
     * @return an instance of Workbook
     */
    Workbook createWorkbook(int rowAccessWindowSize);

    /**
     * Only matters for SXSSF - enables tracking of the column
     *  widths so that autosizing can work. No-op on others.
     */
    void trackAllColumnsForAutosizing(Sheet sheet);
    //************ End SXSSF-specific methods ***************//

    /**
     * Creates the corresponding {@link FormulaEvaluator} for the
     * type of Workbook handled by this Provider.
     *
     * @param wb The workbook to base the formula evaluator on.
     * @return A new instance of a matching type of formula evaluator.
     */
    FormulaEvaluator createFormulaEvaluator(Workbook wb);

    /**
     * Opens a sample file from the standard HSSF test data directory
     *
     * @return an open {@code InputStream} for the specified sample file
     */
    byte[] getTestDataFileContent(String fileName);

    SpreadsheetVersion getSpreadsheetVersion();

    /**
     * @return "xls" or "xlsx"
     */
    String getStandardFileNameExtension();
}