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package org.apache.poi.ss.util;

import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.record.RecordInputStream;
import org.apache.poi.util.LittleEndianByteArrayOutputStream;
import org.apache.poi.util.LittleEndianOutput;

Implementation of the cell range address lists,like is described
in OpenOffice.org's Excel Documentation: excelfileformat.pdf sec 2.5.14 -
'Cell Range Address List'
In BIFF8 there is a common way to store absolute cell range address lists in
several records (not formulas). A cell range address list consists of a field
with the number of ranges and the list of the range addresses. Each cell
range address (called an ADDR structure) contains 4 16-bit-values.

Author:
Dragos Buleandra (dragos.buleandra@trade2b.ro)/**
 * Implementation of the cell range address lists,like is described
 * in OpenOffice.org's Excel Documentation: excelfileformat.pdf sec 2.5.14 -
 * 'Cell Range Address List'
 * 
 * In BIFF8 there is a common way to store absolute cell range address lists in
 * several records (not formulas). A cell range address list consists of a field
 * with the number of ranges and the list of the range addresses. Each cell
 * range address (called an ADDR structure) contains 4 16-bit-values.
 * </p>
 * 
 * @author Dragos Buleandra (dragos.buleandra@trade2b.ro)
 */
public class CellRangeAddressList {

	
List of CellRangeAddresses. Each structure represents a cell range
/**
	 * List of <tt>CellRangeAddress</tt>es. Each structure represents a cell range
	 */
	protected final List<CellRangeAddress> _list;

	public CellRangeAddressList() {
		_list = new ArrayList<>();
	}
	
Convenience constructor for creating a CellRangeAddressList with a single 
CellRangeAddress.  Other CellRangeAddresses may be added later.
/**
	 * Convenience constructor for creating a <tt>CellRangeAddressList</tt> with a single 
	 * <tt>CellRangeAddress</tt>.  Other <tt>CellRangeAddress</tt>es may be added later.
	 */
	public CellRangeAddressList(int firstRow, int lastRow, int firstCol, int lastCol) {
		this();
		addCellRangeAddress(firstRow, firstCol, lastRow, lastCol);
	}
	
Params:
in – the RecordInputstream to read the record from/**
	 * @param in the RecordInputstream to read the record from
	 */
	public CellRangeAddressList(RecordInputStream in) {
		this();
		int nItems = in.readUShort();

		for (int k = 0; k < nItems; k++) {
			_list.add(new CellRangeAddress(in));
		}
	}
	
Get the number of following ADDR structures. The number of this
structures is automatically set when reading an Excel file and/or
increased when you manually add a new ADDR structure . This is the reason
there isn't a set method for this field .
Returns:
number of ADDR structures/**
	 * Get the number of following ADDR structures. The number of this
	 * structures is automatically set when reading an Excel file and/or
	 * increased when you manually add a new ADDR structure . This is the reason
	 * there isn't a set method for this field .
	 * 
	 * @return number of ADDR structures
	 */
	public int countRanges() {
		return _list.size();
	}

	
Add a cell range structure.
Params:
firstRow – - the upper left hand corner's row
firstCol – - the upper left hand corner's col
lastRow – - the lower right hand corner's row
lastCol – - the lower right hand corner's col/**
	 * Add a cell range structure.
	 * 
	 * @param firstRow - the upper left hand corner's row
	 * @param firstCol - the upper left hand corner's col
	 * @param lastRow - the lower right hand corner's row
	 * @param lastCol - the lower right hand corner's col
	 */
	public void addCellRangeAddress(int firstRow, int firstCol, int lastRow, int lastCol) {
		CellRangeAddress region = new CellRangeAddress(firstRow, lastRow, firstCol, lastCol);
		addCellRangeAddress(region);
	}
	public void addCellRangeAddress(CellRangeAddress cra) {
		_list.add(cra);
	}
	public CellRangeAddress remove(int rangeIndex) {
		if (_list.isEmpty()) {
			throw new RuntimeException("List is empty");
		}
		if (rangeIndex < 0 || rangeIndex >= _list.size()) {
			throw new RuntimeException("Range index (" + rangeIndex 
					+ ") is outside allowable range (0.." + (_list.size()-1) + ")");
		}
		return _list.remove(rangeIndex);
	}

	
Returns:
CellRangeAddress at the given index/**
	 * @return <tt>CellRangeAddress</tt> at the given index
	 */
	public CellRangeAddress getCellRangeAddress(int index) {
		return _list.get(index);
	}

	public int getSize() {
		return getEncodedSize(_list.size());
	}
	
Returns:
the total size of for the specified number of ranges,
 including the initial 2 byte range count/**
	 * @return the total size of for the specified number of ranges,
	 *  including the initial 2 byte range count
	 */
	public static int getEncodedSize(int numberOfRanges) {
		return 2 + CellRangeAddress.getEncodedSize(numberOfRanges);
	}

	public int serialize(int offset, byte[] data) {
		int totalSize = getSize();
		serialize(new LittleEndianByteArrayOutputStream(data, offset, totalSize));
		return totalSize;
	}
	public void serialize(LittleEndianOutput out) {
		int nItems = _list.size();
		out.writeShort(nItems);
		for (int k = 0; k < nItems; k++) {
			CellRangeAddress region = _list.get(k);
			region.serialize(out);
		}
	}
	

	public CellRangeAddressList copy() {
		CellRangeAddressList result = new CellRangeAddressList();
		
		int nItems = _list.size();
		for (int k = 0; k < nItems; k++) {
			CellRangeAddress region = _list.get(k);
			result.addCellRangeAddress(region.copy());
		}
		return result;
	}
	public CellRangeAddress[] getCellRangeAddresses() {
		CellRangeAddress[] result = new CellRangeAddress[_list.size()];
		_list.toArray(result);
		return result;
	}
}