poi/src/java/org/apache/poi/ss/usermodel/IgnoredErrorType.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.ss.usermodel;

/**
 * Types of ignored workbook and worksheet error.
 * 
 * TODO Implement these for HSSF too, using FeatFormulaErr2,
 *  see bugzilla bug #46136 for details
 */
public enum IgnoredErrorType {
    /**
     * ????. Probably XSSF-only.
     */
    CALCULATED_COLUMN,
    
    /**
     * Whether to check for references to empty cells.
     * HSSF + XSSF.
     */
    EMPTY_CELL_REFERENCE,
    
    /**
     * Whether to check for calculation/evaluation errors.
     * HSSF + XSSF.
     */
    EVALUATION_ERROR,
    
    /**
     * Whether to check formulas in the range of the shared feature 
     *  that are inconsistent with formulas in neighbouring cells.
     * HSSF + XSSF.
     */
    FORMULA,
    
    /**
     * Whether to check formulas in the range of the shared feature 
     * with references to less than the entirety of a range containing 
     * continuous data.
     * HSSF + XSSF.
     */
    FORMULA_RANGE,
    
    /**
     * ????. Is this XSSF-specific the same as performDataValidation
     *  in HSSF?
     */
    LIST_DATA_VALIDATION,
    
    /**
     * Whether to check the format of string values and warn
     *  if they look to actually be numeric values.
     * HSSF + XSSF.
     */
    NUMBER_STORED_AS_TEXT,
    
    /**
     * ????. Is this XSSF-specific the same as checkDateTimeFormats
     *  in HSSF?
     */
    TWO_DIGIT_TEXT_YEAR,
    
    /**
     * Whether to check for unprotected formulas.
     * HSSF + XSSF.
     */
    UNLOCKED_FORMULA
}