How to order 1000 elements in a swt column table with O(n log(n)) complexity! using Comparator and Array.sort() implemented in a TableColumn Listener Factory
/*
* This snippet show how to order 1000 elements in a swt column table
* with O(n log(n)) complexity! using Comparator and Array.sort()
* implemented in a TableColumn Listener Factory
*
* Comparator implemented: INT_COMPARATOR, STRING_COMPARATOR, DATE_COMPARATOR, DOUBLE_COMPARATOR, HOUR_COMPARATOR
* Example: column.addListener(SWT.Selection, SortListenerFactory.getListener(SortListenerFactory.STRING_COMPARATOR));
*
* Gianluigi Davassi
* Feel free to contact me: davassi (at) yahoo.it
*
* */
/* Copyright (C) 2004 by Gianluigi Davassi www.omega-dream.com
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Author: Gianluigi Davassi
davassi (at) yahoo.it
www.omega-dream.com
*/
package org.omegadream;
import java.text.Collator;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Date;
import java.util.Locale;
import java.util.Random;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
public class TableSortListenerFactory {
private static final int MAX_ELEMENTS = 1000;
private Display display;
private Shell shell;
private Table table;
private TableColumn intColumn,stringColumn,dateColumn,doubleColumn,hourColumn;
private Random ran = new Random();
public TableSortListenerFactory() {
display = new Display();
shell = new Shell(display);
shell.setSize(640, 480);
shell.setText("A Table Sorter Example. Click on column header to order it!");
shell.setLayout(new FillLayout());
table = new Table(shell, SWT.HIDE_SELECTION|SWT.SINGLE|SWT.FULL_SELECTION|SWT.BORDER);
table.setHeaderVisible(true);
table.setLinesVisible(true);
intColumn = new TableColumn(table, SWT.CENTER);
intColumn.setText("Number Column");
intColumn.setWidth(120);
intColumn.addListener(SWT.Selection, SortListenerFactory.getListener(SortListenerFactory.INT_COMPARATOR));
stringColumn = new TableColumn(table, SWT.CENTER);
stringColumn.setText("String Column");
stringColumn.setWidth(120);
stringColumn.addListener(SWT.Selection, SortListenerFactory.getListener(SortListenerFactory.STRING_COMPARATOR));
dateColumn = new TableColumn(table, SWT.CENTER);
dateColumn.setText("Date Column");
dateColumn.setWidth(120);
dateColumn.addListener(SWT.Selection, SortListenerFactory.getListener(SortListenerFactory.DATE_COMPARATOR));
doubleColumn = new TableColumn(table, SWT.CENTER);
doubleColumn.setText("Double Column");
doubleColumn.setWidth(120);
doubleColumn.addListener(SWT.Selection, SortListenerFactory.getListener(SortListenerFactory.DOUBLE_COMPARATOR));
hourColumn = new TableColumn(table, SWT.CENTER);
hourColumn.setText("Hour Column");
hourColumn.setWidth(120);
hourColumn.addListener(SWT.Selection, SortListenerFactory.getListener(SortListenerFactory.HOUR_COMPARATOR));
// let's populate the table with random data!
for (int i = 0; i< MAX_ELEMENTS ; i++)
{
String int_value = String.valueOf(ran.nextInt(1000000));
String string_value = randomstring(4,16);
String date_value = "" + ran.nextInt(31) + "/" + ran.nextInt(12) + "/" + ran.nextInt(2000); // dd-mm-aaaa
String double_value = String.valueOf(ran.nextDouble());
String hour_value = "" + ran.nextInt(24) + ":" + ran.nextInt(60) + ":" + ran.nextInt(60); // hh:mm:SS
// ok now store it in the table
TableItem item = new TableItem(table, SWT.NONE);
item.setText(new String[] { int_value, string_value, date_value, double_value, hour_value });
}
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
public static void main(String[] args)
{
new TableSortListenerFactory();
}
private int rand(int lo, int hi)
{
int n = hi - lo + 1;
int i = ran.nextInt() % n;
if (i < 0)
i = -i;
return lo + i;
}
private String randomstring(int lo, int hi)
{
int n = rand(lo, hi);
byte b[] = new byte[n];
for (int i = 0; i < n; i++)
b[i] = (byte)rand('a', 'z');
return new String(b, 0);
}
}
// this is the ListenerFactory implementation
class SortListenerFactory implements Listener
{
private Comparator currentComparator = null;
private Collator col = Collator.getInstance(Locale.getDefault());
public static final int INT_COMPARATOR = 0;
public static final int STRING_COMPARATOR = 1;
public static final int DATE_COMPARATOR = 2;
public static final int DOUBLE_COMPARATOR = 3;
public static final int HOUR_COMPARATOR = 4;
private SortListenerFactory(int _comp)
{
switch (_comp)
{
case INT_COMPARATOR:
currentComparator = intComparator;
break;
case STRING_COMPARATOR:
currentComparator = strComparator;
break;
case DATE_COMPARATOR:
currentComparator = dateComparator;
break;
case DOUBLE_COMPARATOR:
currentComparator = doubleComparator;
break;
case HOUR_COMPARATOR:
currentComparator = hourComparator;
break;
default:
currentComparator = strComparator;
}
}
public static Listener getListener(int _comp)
{
return new SortListenerFactory(_comp);
}
private int colIndex = 0;
private int updown = 1;
// Integer Comparator
private Comparator intComparator = new Comparator()
{
public int compare(Object arg0, Object arg1) {
TableItem t1 = (TableItem)arg0;
TableItem t2 = (TableItem)arg1;
int v1 = Integer.parseInt(t1.getText(colIndex));
int v2 = Integer.parseInt(t2.getText(colIndex));
if (v1<v2) return 1*updown;
if (v1>v2) return -1*updown;
return 0;
}
};
// String Comparator
private Comparator strComparator = new Comparator()
{
public int compare(Object arg0, Object arg1) {
TableItem t1 = (TableItem)arg0;
TableItem t2 = (TableItem)arg1;
String v1 = (t1.getText(colIndex));
String v2 = (t2.getText(colIndex));
return (col.compare(v1,v2))*updown;
}
};
// Double Comparator
private Comparator doubleComparator = new Comparator()
{
public int compare(Object arg0, Object arg1) {
TableItem t1 = (TableItem)arg0;
TableItem t2 = (TableItem)arg1;
double v1 = Double.parseDouble(t1.getText(colIndex));
double v2 = Double.parseDouble(t2.getText(colIndex));
if (v1<v2) return 1*updown;
if (v1>v2) return -1*updown;
return 0;
}
};
// Hour Comparator (hh:mm:ss)
private Comparator hourComparator = new Comparator()
{
public int compare(Object arg0, Object arg1) {
TableItem t1 = (TableItem)arg0;
TableItem t2 = (TableItem)arg1;
String v1 = (t1.getText(colIndex)).trim();
String v2 = (t2.getText(colIndex)).trim();
DateFormat df = new SimpleDateFormat("hh:mm:ss");
Date d1 = null; Date d2 = null;
try {
d1 = df.parse(v1);
} catch (ParseException e)
{
System.out.println("[WARNING] v1 " + v1);
try { d1 = df.parse("01:01:01"); } catch (ParseException e1) {}
}
try {
d2 = df.parse(v2);
} catch (ParseException e)
{
System.out.println("[WARNING] v2 " + v2);
try { d2 = df.parse("01:01:01"); } catch (ParseException e1) {}
}
if (d1.equals(d2))
return 0;
return updown*(d1.before(d2) ? 1 : -1);
}
};
private Comparator dateComparator = new Comparator()
{
public int compare(Object arg0, Object arg1)
{
TableItem t1 = (TableItem)arg0;
TableItem t2 = (TableItem)arg1;
String v1 = (t1.getText(colIndex)).trim();
String v2 = (t2.getText(colIndex)).trim();
v1.replaceAll("-", "/");
v2.replaceAll("-", "/");
DateFormat df_europe = new SimpleDateFormat("dd/MM/yyyy");
DateFormat df_usa = new SimpleDateFormat("yyyy/MM/dd");
DateFormat df = df_europe;
Date d1 = null; Date d2 = null;
try {
d1 = df.parse(v1);
} catch (ParseException e)
{
//System.out.println("[WARNING] v1 " + v1);
d1 = new Date("01/01/1900");
}
try {
d2 = df.parse(v2);
} catch (ParseException e)
{
d2 = new Date("01/01/1900");
}
if (d1.equals(d2))
return 0;
return updown*(d1.before(d2) ? 1 : -1);
}
};
public void handleEvent(Event e) {
updown = (updown == 1 ? -1 : 1);
TableColumn currentColumn = (TableColumn)e.widget;
Table table = currentColumn.getParent();
colIndex = searchColumnIndex(currentColumn);
table.setRedraw(false);
TableItem[] items = table.getItems();
Arrays.sort(items,currentComparator);
table.setItemCount(items.length);
for (int i = 0;i<items.length;i++)
{
TableItem item = new TableItem(table,SWT.NONE,i);
item.setText(getData(items[i]));
items[i].dispose();
}
table.setRedraw(true);
}
private String[] getData(TableItem t)
{
Table table = t.getParent();
int colCount = table.getColumnCount();
String [] s = new String[colCount];
for (int i = 0;i<colCount;i++)
s[i] = t.getText(i);
return s;
}
private int searchColumnIndex(TableColumn currentColumn)
{
Table table = currentColumn.getParent();
int in = 0;
for (int i = 0;i<table.getColumnCount();i++)
if (table.getColumn(i) == currentColumn)
in = i;
return in;
}
}
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