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package org.apache.poi.xssf.model;

import org.apache.poi.ss.usermodel.RichTextString;

/**
 * Table of strings shared across all sheets in a workbook.
 * 

* A workbook may contain thousands of cells containing string (non-numeric) data. Furthermore this data is very * likely to be repeated across many rows or columns. The goal of implementing a single string table that is shared * across the workbook is to improve performance in opening and saving the file by only reading and writing the * repetitive information once. *

*

* Consider for example a workbook summarizing information for cities within various countries. There may be a * column for the name of the country, a column for the name of each city in that country, and a column * containing the data for each city. In this case the country name is repetitive, being duplicated in many cells. * In many cases the repetition is extensive, and a tremendous savings is realized by making use of a shared string * table when saving the workbook. When displaying text in the spreadsheet, the cell table will just contain an * index into the string table as the value of a cell, instead of the full string. *

*

* The shared string table contains all the necessary information for displaying the string: the text, formatting * properties, and phonetic properties (for East Asian languages). *

*/ public interface SharedStrings { /** * Return a string item by index * * @param idx index of item to return. * @return the item at the specified position in this Shared String table. */ RichTextString getItemAt(int idx); /** * Return an integer representing the total count of strings in the workbook. This count does not * include any numbers, it counts only the total of text strings in the workbook. * * @return the total count of strings in the workbook */ int getCount(); /** * Returns an integer representing the total count of unique strings in the Shared String Table. * A string is unique even if it is a copy of another string, but has different formatting applied * at the character level. * * @return the total count of unique strings in the workbook */ int getUniqueCount(); }




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