Mega Code Archive
A two dimensional Vector
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//** Copyright Statement ***************************************************
//The Salmon Open Framework for Internet Applications (SOFIA)
// Copyright (C) 1999 - 2002, Salmon LLC
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License version 2
// as published by the Free Software Foundation;
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// For more information please visit http://www.salmonllc.com
//** End Copyright Statement ***************************************************
/////////////////////////
//$Archive: /JADE/SourceCode/com/salmonllc/util/Vector2D.java $
//$Author: Dan $
//$Revision: 15 $
//$Modtime: 10/30/02 2:59p $
/////////////////////////
import java.util.*;
/**
* This class is a two dimensional Vector. It contains rows and columns that can expand as necessary.
*/
public class Vector2D implements java.io.Serializable
{
Vector _rows = new Vector();
int _columnCapacity = 5;
int _columnCount;
int _columnSize;
int _rowSize;
/**
* Constructs an empty 2 Dimensional vector.
*/
public Vector2D() {
super();
}
/**
* This method adds a specified number of columns to the vector
* @param The Number of colums to add.
*/
public void addColumns(int noColumns)
{
if ((noColumns + _columnCount) >= _columnCapacity)
{
_columnCapacity = noColumns + _columnCount + _columnCapacity;
}
for (int i = 0; i < _rows.size(); i++)
{
Object[] tgt = new Object[_columnCapacity];
Object[] src = (Object[]) _rows.elementAt(i);
System.arraycopy(src, 0, tgt, 0, _columnCount);
_rows.setElementAt(tgt, i);
}
_columnCount += noColumns;
}
/**
* This method adds a specified number of rows to the vector
* @param The Number of rows to add.
*/
public void addRows(int noRows)
{
for (int i = 0; i < noRows; i++)
{
Object[] o = new Object[_columnCapacity];
_rows.addElement(o);
}
}
/**
* This method returns the object at row and column..
*/
public Object elementAt(int index) {
if (index < 0 || index >= size())
return null;
int row = index / _columnCount;
int column = index % _columnCount;
Object[] o = (Object[]) _rows.elementAt(row);
return o[column];
}
/**
* This method returns the object at row and column..
*/
public Object elementAt(int row, int column) {
if (row < 0 || row >= _rows.size())
return null;
else if (column < 0 || column >= _columnCount)
return null;
Object[] o = (Object[]) _rows.elementAt(row);
return o[column];
}
public void exportData(boolean includeHeaders, java.io.PrintWriter p)
{
StringBuffer work = new StringBuffer();
Object data = null;
//
work.append("<TABLE BORDER = \"1\">");
// include headers
if (includeHeaders)
{
work.append("<TR>");
work.append("<TH>");
work.append("ROW_NUM");
work.append("</TH>");
for (int i = 0; i < getColumnCount(); i++)
{
work.append("<TH>");
work.append("COL_" + i);
work.append("</TH>");
}
work.append("</TR>\n");
}
for (int rows = 0; rows < getRowCount(); rows++)
{
work.append("<TR>");
work.append("<TD>ROW_" + rows);
work.append("</TD>");
for (int cols = 0; cols < getColumnCount(); cols++)
{
work.append("<TD>");
data = elementAt(rows, cols);
if (data == null)
{
work.append(" ");
}
else
{
work.append(data.toString());
}
work.append("</TD>");
}
work.append("</TR>\n");
}
work.append("</TABLE>");
p.println(work.toString());
p.flush();
}
/**
* This method returns the number of columns in the 2D Vector
*/
public int getColumnCount() {
return _columnCount;
}
/**
* This method returns the number of columns that are occupied with data in the 2D Vector
*/
public int getColumnSize()
{
return _columnSize + 1;
}
/**
* This method returns the number of columns in the 2DVector
*/
public int getRowCount() {
return _rows.size();
}
/**
* This method returns the number of rows that are occupied with data in the 2D Vector
*/
public int getRowSize()
{
return _rowSize + 1;
}
/**
* This method returns the index of the item at row and column or -1 if the element doesn't exist.
*/
public int indexAt(int row, int column) {
if (row < 0 || row >= _rows.size())
return -1;
else if (column < 0 || column >= _columnCount)
return -1;
return (row * _columnCount) + column;
}
/**
* This method inserts a row immediately before the specified row
*/
public void insertRow(int row) {
if (row < 0)
return;
Object[] o = new Object[_columnCapacity];
if (row > _rows.size())
_rows.addElement(o);
else
_rows.insertElementAt(o,row);
}
/**
* This method inserts a row immediately before the specified row
*/
public void removeAll()
{
_rows.removeAllElements();
_columnCapacity = 5;
_columnCount = 0;
_columnSize = 0;
_rowSize = 0;
}
/**
* This method removes a row from the 2DVector
* @param row The row to remove.
*/
public void removeRow(int row)
{
if (row < 0 || row > _rows.size())
return;
_rows.removeElementAt(row);
_rowSize = _rowSize - 1;
}
/**
* This method sets the value of a cell in the 2D Vector
* @param row The row position
* @param column The row position
* @param in The object to set.
*/
public void setElementAt(int row, int column, Object in)
{
if (row < 0 || row >= _rows.size())
return;
else
if (column < 0 || column >= _columnCount)
return;
Object[] o = (Object[]) _rows.elementAt(row);
o[column] = in;
// this is to get only the occupied rows and columns
if (_rowSize < row)
_rowSize = row;
if (_columnSize < column)
_columnSize = column;
}
/**
* This method sets the value of a cell in the 2D Vector
* @param in The object to set.
* @param index The position to put it at
*/
public void setElementAt(int index,Object in){
if (index < 0 || index >= size())
return;
int row = index / _columnCount;
int column = index % _columnCount;
Object[] o = (Object[]) _rows.elementAt(row);
o[column] = in;
// this is to get only the occupied rows and columns
if (_rowSize < row)
_rowSize = row;
if (_columnSize < column)
_columnSize = column;
}
/**
* This method was created in VisualAge.
* @return int
*/
public int size() {
return (_rows.size() * _columnCount);
}
/**
* Returns a string representation of the 2D vector.
*/
public String toString()
{
StringBuffer work = new StringBuffer();
Object data = null;
boolean commaFlag = false;
for (int rows = 0; rows < getRowCount(); rows++)
{
work.append("[");
for (int cols = 0; cols < getColumnCount(); cols++)
{
if (commaFlag == true)
{
work.append(",");
}
data = elementAt(rows, cols);
if (data == null)
{
work.append("NULL");
}
else
{
work.append(data.toString());
}
commaFlag = true;
}
work.append("]\n");
commaFlag = false;
}
return work.toString();
}
}
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