http://poi.apache.org/: Apache POI - Java API To Access Microsoft Format Files (Apache Software Foundation) 
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package org.apache.poi.ss.util;

import java.util.ArrayList;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Set;

import org.apache.poi.ss.SpreadsheetVersion;
import org.apache.poi.ss.usermodel.Cell;



See OOO documentation: excelfileformat.pdf sec 2.5.14 - 'Cell Range Address'

Common superclass of 8-bit and 16-bit versions

/**
 * See OOO documentation: excelfileformat.pdf sec 2.5.14 - 'Cell Range Address'<p>
 *
 * Common superclass of 8-bit and 16-bit versions
 */
public abstract class CellRangeAddressBase implements Iterable<CellAddress> {

    
Indicates a cell or range is in the given relative position in a range.
More than one of these may apply at once.

/**
     * Indicates a cell or range is in the given relative position in a range.
     * More than one of these may apply at once.
     */
    public static enum CellPosition {
        
range starting rows are equal 
/** range starting rows are equal */
        TOP,
        
range ending rows are equal 
/** range ending rows are equal */
        BOTTOM,
        
range starting columns are equal 
/** range starting columns are equal */
        LEFT,
        
range ending columns are equal 
/** range ending columns are equal */
        RIGHT,
        
a cell or range is completely inside another range, without touching any edges (a cell in this position can't be in any others) 
/** a cell or range is completely inside another range, without touching any edges (a cell in this position can't be in any others) */
        INSIDE,
        ;
    }
	private int _firstRow;
	private int _firstCol;
	private int _lastRow;
	private int _lastCol;

	protected CellRangeAddressBase(int firstRow, int lastRow, int firstCol, int lastCol) {
		_firstRow = firstRow;
		_lastRow = lastRow;
		_firstCol = firstCol;
		_lastCol = lastCol;
	}

	
Validate the range limits against the supplied version of Excel

Params:
  • ssVersion – the version of Excel to validate against
Throws:
/**
	 * Validate the range limits against the supplied version of Excel
	 *
	 * @param ssVersion the version of Excel to validate against
	 * @throws IllegalArgumentException if the range limits are outside of the allowed range
	 */
	public void validate(SpreadsheetVersion ssVersion) {
		validateRow(_firstRow, ssVersion);
		validateRow(_lastRow, ssVersion);
		validateColumn(_firstCol, ssVersion);
		validateColumn(_lastCol, ssVersion);
	}
	
Runs a bounds check for row numbers

Params:
  • row – 
/**
	 * Runs a bounds check for row numbers
	 * @param row
	 */
	private static void validateRow(int row, SpreadsheetVersion ssVersion) {
		int maxrow = ssVersion.getLastRowIndex();
		if (row > maxrow) throw new IllegalArgumentException("Maximum row number is " + maxrow);
		if (row < 0) throw new IllegalArgumentException("Minumum row number is 0");
	}

	
Runs a bounds check for column numbers

Params:
  • column – 
/**
	 * Runs a bounds check for column numbers
	 * @param column
	 */
	private static void validateColumn(int column, SpreadsheetVersion ssVersion) {
		int maxcol = ssVersion.getLastColumnIndex();
		if (column > maxcol) throw new IllegalArgumentException("Maximum column number is " + maxcol);
		if (column < 0)	throw new IllegalArgumentException("Minimum column number is 0");
	}


	//TODO use the correct SpreadsheetVersion
	public final boolean isFullColumnRange() {
		return (_firstRow == 0 && _lastRow == SpreadsheetVersion.EXCEL97.getLastRowIndex())
		  || (_firstRow == -1 && _lastRow == -1);
	}
	//TODO use the correct SpreadsheetVersion
	public final boolean isFullRowRange() {
		return (_firstCol == 0 && _lastCol == SpreadsheetVersion.EXCEL97.getLastColumnIndex())
		  || (_firstCol == -1 && _lastCol == -1);
	}

	
Returns:column number for the upper left hand corner
/**
	 * @return column number for the upper left hand corner
	 */
	public final int getFirstColumn() {
		return _firstCol;
	}

	
Returns:row number for the upper left hand corner
/**
	 * @return row number for the upper left hand corner
	 */
	public final int getFirstRow() {
		return _firstRow;
	}

	
Returns:column number for the lower right hand corner
/**
	 * @return column number for the lower right hand corner
	 */
	public final int getLastColumn() {
		return _lastCol;
	}

	
Returns:row number for the lower right hand corner
/**
	 * @return row number for the lower right hand corner
	 */
	public final int getLastRow() {
		return _lastRow;
	}

	
Determines if the given coordinates lie within the bounds 
of this range.

Params:
  • rowInd – The row, 0-based.
  • colInd – The column, 0-based.
See Also:
Returns:True if the coordinates lie within the bounds, false otherwise.
/**
	 * Determines if the given coordinates lie within the bounds 
	 * of this range.
	 *
	 * @param rowInd The row, 0-based.
	 * @param colInd The column, 0-based.
	 * @return True if the coordinates lie within the bounds, false otherwise.
	 * @see #intersects(CellRangeAddressBase) for checking if two ranges overlap
	 */
	public boolean isInRange(int rowInd, int colInd) {
		return _firstRow <= rowInd && rowInd <= _lastRow && //containsRow
				_firstCol <= colInd && colInd <= _lastCol; //containsColumn
	}
	
    
Determines if the given CellReference lies within the bounds of this range. 
NOTE: It is up to the caller to ensure the reference is 
for the correct sheet, since this instance doesn't have a sheet reference.

Params:
  • ref – the CellReference to check
See Also:
Returns:True if the reference lies within the bounds, false otherwise.
/**
     * Determines if the given {@link CellReference} lies within the bounds 
     * of this range.  
     * <p>NOTE: It is up to the caller to ensure the reference is 
     * for the correct sheet, since this instance doesn't have a sheet reference.
     *
     * @param ref the CellReference to check
     * @return True if the reference lies within the bounds, false otherwise.
     * @see #intersects(CellRangeAddressBase) for checking if two ranges overlap
     */
	public boolean isInRange(CellReference ref) {
	    return isInRange(ref.getRow(), ref.getCol());
	}
	
    
Determines if the given CellAddress lies within the bounds of this range. 
NOTE: It is up to the caller to ensure the reference is 
for the correct sheet, since this instance doesn't have a sheet reference.

Params:
  • ref – the CellAddress to check
See Also:
Returns:True if the reference lies within the bounds, false otherwise.
/**
     * Determines if the given {@link CellAddress} lies within the bounds 
     * of this range.  
     * <p>NOTE: It is up to the caller to ensure the reference is 
     * for the correct sheet, since this instance doesn't have a sheet reference.
     *
     * @param ref the CellAddress to check
     * @return True if the reference lies within the bounds, false otherwise.
     * @see #intersects(CellRangeAddressBase) for checking if two ranges overlap
     */
    public boolean isInRange(CellAddress ref) {
        return isInRange(ref.getRow(), ref.getColumn());
    }
	
	
Determines if the given Cell lies within the bounds of this range. 
NOTE: It is up to the caller to ensure the reference is 
for the correct sheet, since this instance doesn't have a sheet reference.

Params:
  • cell – the Cell to check
See Also:
Returns:True if the cell lies within the bounds, false otherwise.
/**
	 * Determines if the given {@link Cell} lies within the bounds 
	 * of this range.  
	 * <p>NOTE: It is up to the caller to ensure the reference is 
	 * for the correct sheet, since this instance doesn't have a sheet reference.
	 *
	 * @param cell the Cell to check
	 * @return True if the cell lies within the bounds, false otherwise.
	 * @see #intersects(CellRangeAddressBase) for checking if two ranges overlap
	 */
	public boolean isInRange(Cell cell) {
	    return isInRange(cell.getRowIndex(), cell.getColumnIndex());
	}
	
	
Check if the row is in the specified cell range

Params:
  • rowInd – the row to check
Returns:true if the range contains the row [rowInd]
/**
	 * Check if the row is in the specified cell range
	 *
	 * @param rowInd the row to check
	 * @return true if the range contains the row [rowInd]
	 */
	public boolean containsRow(int rowInd) {
		return _firstRow <= rowInd && rowInd <= _lastRow;
	}
	
	
Check if the column is in the specified cell range

Params:
  • colInd – the column to check
Returns:true if the range contains the column [colInd]
/**
	 * Check if the column is in the specified cell range
	 *
	 * @param colInd the column to check
	 * @return true if the range contains the column [colInd]
	 */
	public boolean containsColumn(int colInd) {
		return _firstCol <= colInd && colInd <= _lastCol;
	}
	
	
Determines whether or not this CellRangeAddress and the specified CellRangeAddress intersect.

Params:
  • other – a candidate cell range address to check for intersection with this range
See Also:
Returns:returns true if this range and other range have at least 1 cell in common
/**
	 * Determines whether or not this CellRangeAddress and the specified CellRangeAddress intersect.
	 *
	 * @param other a candidate cell range address to check for intersection with this range
	 * @return returns true if this range and other range have at least 1 cell in common
	 * @see #isInRange(int, int) for checking if a single cell intersects
	 */
	public boolean intersects(CellRangeAddressBase other) {
		return this._firstRow <= other._lastRow &&
				this._firstCol <= other._lastCol &&
				other._firstRow <= this._lastRow &&
				other._firstCol <= this._lastCol;
	}
	
	
Useful for logic like table/range styling, where some elements apply based on relative position in a range.

Params:
  • rowInd – 
  • colInd – 
Returns:set of CellPositions occupied by the given coordinates. Empty if the coordinates are not in the range, never null.
Since:3.17 beta 1
/**
	 * Useful for logic like table/range styling, where some elements apply based on relative position in a range.
	 * @param rowInd
	 * @param colInd
	 * @return set of {@link CellPosition}s occupied by the given coordinates.  Empty if the coordinates are not in the range, never null.
	 * @since 3.17 beta 1
	 */
	public Set<CellPosition> getPosition(int rowInd, int colInd) {
	    Set<CellPosition> positions = EnumSet.noneOf(CellPosition.class);
	    if (rowInd > getFirstRow() && rowInd < getLastRow() && colInd > getFirstColumn() && colInd < getLastColumn()) {
	        positions.add(CellPosition.INSIDE);
	        return positions; // entirely inside, matches no boundaries
	    }
	    // check edges
	    if (rowInd == getFirstRow()) positions.add(CellPosition.TOP);
	    if (rowInd == getLastRow()) positions.add(CellPosition.BOTTOM);
	    if (colInd == getFirstColumn()) positions.add(CellPosition.LEFT);
	    if (colInd == getLastColumn()) positions.add(CellPosition.RIGHT);
	    
	    return positions;
	}
	
	
Params:
  • firstCol – column number for the upper left hand corner
/**
	 * @param firstCol column number for the upper left hand corner
	 */
	public final void setFirstColumn(int firstCol) {
		_firstCol = firstCol;
	}

	
Params:
  • firstRow – row number for the upper left hand corner
/**
	 * @param firstRow row number for the upper left hand corner
	 */
	public final void setFirstRow(int firstRow) {
		_firstRow = firstRow;
	}

	
Params:
  • lastCol – column number for the lower right hand corner
/**
	 * @param lastCol column number for the lower right hand corner
	 */
	public final void setLastColumn(int lastCol) {
		_lastCol = lastCol;
	}

	
Params:
  • lastRow – row number for the lower right hand corner
/**
	 * @param lastRow row number for the lower right hand corner
	 */
	public final void setLastRow(int lastRow) {
		_lastRow = lastRow;
	}
	
Returns:the size of the range (number of cells in the area).
/**
	 * @return the size of the range (number of cells in the area).
	 */
	public int getNumberOfCells() {
		return (_lastRow - _firstRow + 1) * (_lastCol - _firstCol + 1);
	}

	
Returns an iterator over the CellAddresses in this cell range in row-major order.

Since:POI 4.0.0
/**
	 * Returns an iterator over the CellAddresses in this cell range in row-major order.
	 * @since POI 4.0.0
	 */
	@Override
	public Iterator<CellAddress> iterator() {
		return new RowMajorCellAddressIterator(this);
	}
	
	
 Iterates over the cell addresses in a cell range in row major order
 
 The iterator is unaffected by changes to the CellRangeAddressBase instance
 after the iterator is created.

/**
	 *  Iterates over the cell addresses in a cell range in row major order
	 *  
	 *  The iterator is unaffected by changes to the CellRangeAddressBase instance
	 *  after the iterator is created.
	 */
	private static class RowMajorCellAddressIterator implements Iterator<CellAddress> {
		private final int firstRow, firstCol, lastRow, lastCol;
		private int r, c;
		
		public RowMajorCellAddressIterator(CellRangeAddressBase ref) {
			r = firstRow = ref.getFirstRow();
			c = firstCol = ref.getFirstColumn();
			lastRow = ref.getLastRow();
			lastCol = ref.getLastColumn();
			
			// whole row and whole column ranges currently not supported
			if (firstRow < 0) throw new IllegalStateException("First row cannot be negative.");
			if (firstCol < 0) throw new IllegalStateException("First column cannot be negative.");
			
			// avoid infinite iteration
			if (firstRow > lastRow) throw new IllegalStateException("First row cannot be greater than last row.");
			if (firstCol > lastCol) throw new IllegalStateException("First column cannot be greater than last column.");
		}
		
		@Override
		public boolean hasNext() {
			return r <= lastRow && c <= lastCol;
		}
		
		@Override
		public CellAddress next() {
			if (hasNext()) {
				final CellAddress addr = new CellAddress(r, c);
				// row major order
				if (c < lastCol) {
					c++;
				}
				else { //c >= lastCol, end of row reached
					c = firstCol; //CR
					r++;		  //LF
				}
				return addr;
			}
			throw new NoSuchElementException();
		}
	}

	@Override
	public final String toString() {
		CellAddress crA = new CellAddress(_firstRow, _firstCol);
		CellAddress crB = new CellAddress(_lastRow, _lastCol);
		return getClass().getName() + " [" + crA.formatAsString() + ":" + crB.formatAsString() +"]";
	}
	
	// In case _firstRow > _lastRow or _firstCol > _lastCol
	protected int getMinRow() {
		return Math.min(_firstRow, _lastRow);
	}
	protected int getMaxRow() {
		return Math.max(_firstRow, _lastRow);
	}
	protected int getMinColumn() {
		return Math.min(_firstCol, _lastCol);
	}
	protected int getMaxColumn() {
		return Math.max(_firstCol, _lastCol);
	}
	
	@Override
	public boolean equals(Object other) {
		if (other instanceof CellRangeAddressBase) {
			CellRangeAddressBase o = (CellRangeAddressBase) other;
			return ((getMinRow() == o.getMinRow()) &&
					(getMaxRow() == o.getMaxRow()) &&
					(getMinColumn() == o.getMinColumn()) &&
					(getMaxColumn() == o.getMaxColumn()));
		}
		return false;
	}
	
	@Override
	public int hashCode() {
        return (getMinColumn() +
        (getMaxColumn() << 8) +
        (getMinRow() << 16) +
        (getMaxRow() << 24));
	}
}