SpreadsheetVersion.java

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

import org.apache.poi.ss.util.CellReference;

/**
 * This enum allows spreadsheets from multiple Excel versions to be handled by the common code.
 * Properties of this enum correspond to attributes of the <i>spreadsheet</i> that are easily
 * discernable to the user.  It is not intended to deal with low-level issues like file formats.
 * <p/>
 *
 * @author Josh Micich
 * @author Yegor Kozlov
 */
public enum SpreadsheetVersion {
	/**
	 * Excel97 format aka BIFF8
	 * <ul>
	 * <li>The total number of available columns is 256 (2^8)</li>
	 * <li>The total number of available rows is 64k (2^16)</li>
	 * <li>The maximum number of arguments to a function is 30</li>
	 * <li>Number of conditional format conditions on a cell is 3</li>
     * <li>Length of text cell contents is 32767</li>
	 * </ul>
	 */
	EXCEL97(0x10000, 0x0100, 30, 3, 32767);

	private final int _maxRows;
	private final int _maxColumns;

	private SpreadsheetVersion(int maxRows, int maxColumns, int maxFunctionArgs, int maxCondFormats, int maxText) {
		_maxRows = maxRows;
		_maxColumns = maxColumns;
    }

	/**
	 * @return the maximum number of usable rows in each spreadsheet
	 */
	public int getMaxRows() {
		return _maxRows;
	}

	/**
	 * @return the last (maximum) valid row index, equals to <code> getMaxRows() - 1 </code>
	 */
	public int getLastRowIndex() {
		return _maxRows - 1;
	}

	/**
	 * @return the last (maximum) valid column index, equals to <code> getMaxColumns() - 1 </code>
	 */
	public int getLastColumnIndex() {
		return _maxColumns - 1;
	}

	/**
	 *
	 * @return the last valid column index in a ALPHA-26 representation
	 *  (<code>IV</code> or <code>XFD</code>).
	 */
	public String getLastColumnName() {
		return CellReference.convertNumToColString(getLastColumnIndex());
	}
}