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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/* ====================================================================
   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
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   Unless required by applicable law or agreed to in writing, software
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package org.apache.poi.ss.usermodel;

/**
 * Interface for classes providing differential style definitions, such as conditional format rules
 * and table/pivot table styles.
 * 
 * @since 3.17 beta 1
 */
public interface DifferentialStyleProvider {

    /**
     * @return - border formatting object  if defined,  null otherwise
     */
    BorderFormatting getBorderFormatting();

    /**
     * @return - font formatting object  if defined,  null otherwise
     */
    FontFormatting getFontFormatting();

    /**
     *
     * @return number format defined for this rule, or null if the cell default should be used
     */
    ExcelNumberFormat getNumberFormat();

    /**
     * @return - pattern formatting object if defined, null otherwise
     */
    PatternFormatting getPatternFormatting();

    /**
     * This is the number of rows or columns in a band or stripe.
     * For styles that represent stripes, it must be > 1, for all others it is 0.
     * Not the greatest overloading by the OOXML spec.
     * @return number of rows/columns in a stripe for stripe styles, 0 for all others 
     */
    int getStripeSize();
}