/*
 * @(#)TableSorter.java	1.8 99/04/23
 *
 * Copyright (c) 1997-1999 by Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */

/**
 * A sorter for TableModels. The sorter has a model (conforming to TableModel)
 * and itself implements TableModel. TableSorter does not store or copy
 * the data in the TableModel, instead it maintains an array of
 * integers which it keeps the same size as the number of rows in its
 * model. When the model changes it notifies the sorter that something
 * has changed eg. "rowsAdded" so that its internal array of integers
 * can be reallocated. As requests are made of the sorter (like
 * getValueAt(row, col) it redirects them to its model via the mapping
 * array. That way the TableSorter appears to hold another copy of the table
 * with the rows in a different order. The sorting algorthm used is stable
 * which means that it does not move around rows when its comparison
 * function returns 0 to denote that they are equivalent.
 *
 * @version 1.8 04/23/99
 * @author Philip Milne
 */
package phex.utils;


import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Date;

import javax.swing.JTable;
import javax.swing.event.TableModelEvent;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumnModel;
import javax.swing.table.TableModel;

public class TableSorter extends TableMap
{
    public int indexes[];
     int				oldRowCount = 0;
    private ArrayList sortingColumns = new ArrayList();
    boolean       ascending = true;
    int				compares;
     int				oldSortByColumn = -1;
    boolean       oldAscending = true;


    public TableSorter()
    {
        indexes = new int[0]; // For consistency.
    }

    public TableSorter(TableModel model)
    {
        indexes = new int[0]; // For consistency.
        setModel(model);
    }

    public void setModel(TableModel model) {
        super.setModel(model);
        reallocateIndexes();
    }

    public int compareRowsByColumn(int row1, int row2, int column)
    {
        Class type = model.getColumnClass(column);
        TableModel data = model;

        // Check for nulls

        Object o1 = data.getValueAt(row1, column);
        Object o2 = data.getValueAt(row2, column);

        // If both values are null return 0
        if (o1 == null && o2 == null) {
            return 0;
        }
        else if (o1 == null) { // Define null less than everything.
            return -1;
        }
        else if (o2 == null) {
            return 1;
        }

/* We copy all returned values from the getValue call in case
an optimised model is reusing one object to return many values.
The Number subclasses in the JDK are immutable and so will not be used in
this way but other subclasses of Number might want to do this to save
space and avoid unnecessary heap allocation.
*/
        if (type.getSuperclass() == java.lang.Number.class)
            {
                Number n1 = (Number)data.getValueAt(row1, column);
                double d1 = n1.doubleValue();
                Number n2 = (Number)data.getValueAt(row2, column);
                double d2 = n2.doubleValue();

                if (d1 < d2)
                    return -1;
                else if (d1 > d2)
                    return 1;
                else
                    return 0;
            }
        else if (type == java.util.Date.class)
            {
                Date d1 = (Date)data.getValueAt(row1, column);
                long n1 = d1.getTime();
                Date d2 = (Date)data.getValueAt(row2, column);
                long n2 = d2.getTime();

                if (n1 < n2)
                    return -1;
                else if (n1 > n2)
                    return 1;
                else return 0;
            }
        else if (type == String.class)
        {
            String s1 = data.getValueAt(row1, column).toString();
            String s2 = data.getValueAt(row2, column).toString();
            int result = s1.compareTo(s2);

            if (result < 0)
                return -1;
            else if (result > 0)
                return 1;
            else return 0;
        }
        else if (type == Boolean.class)
            {
                Boolean bool1 = (Boolean)data.getValueAt(row1, column);
                boolean b1 = bool1.booleanValue();
                Boolean bool2 = (Boolean)data.getValueAt(row2, column);
                boolean b2 = bool2.booleanValue();

                if (b1 == b2)
                    return 0;
                else if (b1) // Define false < true
                    return 1;
                else
                    return -1;
            }
        else
            {
                Object v1 = data.getValueAt(row1, column);
                String s1 = v1.toString();
                Object v2 = data.getValueAt(row2, column);
                String s2 = v2.toString();
                int result = s1.compareTo(s2);

                if (result < 0)
                    return -1;
                else if (result > 0)
                    return 1;
                else return 0;
            }
    }

    public int compare(int row1, int row2)
    {
        compares++;
        for(int level = 0; level < sortingColumns.size(); level++)
            {
                Integer column = (Integer)sortingColumns.get(level);
                int result = compareRowsByColumn(row1, row2, column.intValue());
                if (result != 0)
                    return ascending ? result : -result;
            }
        return 0;
    }

    public synchronized void  reallocateIndexes()
    {
        int rowCount = model.getRowCount();

        if (rowCount == oldRowCount)
            return;

        if (rowCount > oldRowCount)
        {
            int[]	newIndexes = new int[rowCount];

            for (int i = 0; i < oldRowCount; i++)
            {
                    newIndexes[i] = indexes[i];
            }
            for (int i = oldRowCount; i < rowCount; i++)
            {
                newIndexes[i] = i;
            }
            indexes = newIndexes;
            oldRowCount = rowCount;
            return;
        }
        // Set up a new array of indexes with the right number of elements
        // for the new data model.
        indexes = new int[rowCount];

        // Initialise with the identity mapping.
        for(int row = 0; row < rowCount; row++)
            indexes[row] = row;

        oldRowCount = rowCount;

        if (oldSortByColumn != -1)
        {
            sortByColumn(oldSortByColumn, oldAscending);
        }
    }

    public void tableChanged(TableModelEvent e)
    {
//		System.out.println("Sorter: tableChanged");
        reallocateIndexes();

        super.tableChanged(e);
    }

    public void checkModel()
    {
        if (indexes.length != model.getRowCount()) {
            reallocateIndexes();
//            System.err.println("Sorter not informed of a change in model.");
        }
    }

    public synchronized void  sort(Object sender)
    {
        checkModel();

        compares = 0;
        // n2sort();
        // qsort(0, indexes.length-1);
        shuttlesort((int[])indexes.clone(), indexes, 0, indexes.length);
//		System.out.println("Compares: "+compares);
    }

    public synchronized void n2sort() {
        for(int i = 0; i < getRowCount(); i++) {
            for(int j = i+1; j < getRowCount(); j++) {
                if (compare(indexes[i], indexes[j]) == -1) {
                    swap(i, j);
                }
            }
        }
    }

    // This is a home-grown implementation which we have not had time
    // to research - it may perform poorly in some circumstances. It
    // requires twice the space of an in-place algorithm and makes
    // NlogN assigments shuttling the values between the two
    // arrays. The number of compares appears to vary between N-1 and
    // NlogN depending on the initial order but the main reason for
    // using it here is that, unlike qsort, it is stable.
    public void shuttlesort(int from[], int to[], int low, int high) {
        if (high - low < 2) {
            return;
        }
        // http://googleresearch.blogspot.com/2006/06/extra-extra-read-all-about-it-nearly.html
        // http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6412541
        // correct avg. of two integers 
        int middle = (low + high) >>> 1;
        shuttlesort(to, from, low, middle);
        shuttlesort(to, from, middle, high);

        int p = low;
        int q = middle;

        /* This is an optional short-cut; at each recursive call,
        check to see if the elements in this subset are already
        ordered.  If so, no further comparisons are needed; the
        sub-array can just be copied.  The array must be copied rather
        than assigned otherwise sister calls in the recursion might
        get out of sinc.  When the number of elements is three they
        are partitioned so that the first set, [low, mid), has one
        element and and the second, [mid, high), has two. We skip the
        optimisation when the number of elements is three or less as
        the first compare in the normal merge will produce the same
        sequence of steps. This optimisation seems to be worthwhile
        for partially ordered lists but some analysis is needed to
        find out how the performance drops to Nlog(N) as the initial
        order diminishes - it may drop very quickly.  */

        if (high - low >= 4 && compare(from[middle-1], from[middle]) <= 0) {
            for (int i = low; i < high; i++) {
                to[i] = from[i];
            }
            return;
        }

        // A normal merge.

        for(int i = low; i < high; i++) {
            if (q >= high || (p < middle && compare(from[p], from[q]) <= 0)) {
                to[i] = from[p++];
            }
            else {
                to[i] = from[q++];
            }
        }
    }

    public synchronized void swap(int i, int j) {
        int tmp = indexes[i];
        indexes[i] = indexes[j];
        indexes[j] = tmp;
    }

    // The mapping only affects the contents of the data rows.
    // Pass all requests to these rows through the mapping array: "indexes".

    public Object getValueAt(int aRow, int aColumn)
    {
        checkModel();
        if (aRow >= indexes.length)
            return "";
        return model.getValueAt(indexes[aRow], aColumn);
    }

    public void setValueAt(Object aValue, int aRow, int aColumn)
    {
        checkModel();
        model.setValueAt(aValue, indexes[aRow], aColumn);
    }

    public void sortByColumn(int column) {
        sortByColumn(column, true);
    }

    public void sortByColumn(int column, boolean ascending) {
        this.ascending = ascending;
        sortingColumns.clear();
        sortingColumns.add(Integer.valueOf(column));
        sort(this);
        super.tableChanged(new TableModelEvent(this));
    }

    // There is no-where else to put this.
    // Add a mouse listener to the Table to trigger a table sort
    // when a column heading is clicked in the JTable.
    public void addMouseListenerToHeaderInTable(JTable table) {
        final TableSorter sorter = this;
        final JTable tableView = table;
        tableView.setColumnSelectionAllowed(false);
        MouseAdapter listMouseListener = new MouseAdapter()
        {
            boolean asc = true;
            public void mouseClicked(MouseEvent e)
            {
                TableColumnModel columnModel = tableView.getColumnModel();
                int viewColumn = columnModel.getColumnIndexAtX(e.getX());
                int column = tableView.convertColumnIndexToModel(viewColumn);
                if(e.getClickCount() == 1 && column != -1)
                {
//					System.out.println("Sorting ...");
                    // reverse order on each click
                    asc = !asc;
                    oldSortByColumn = column;
                    oldAscending = asc;
                    sorter.sortByColumn(column, asc);
                }
            }
        };
        JTableHeader th = tableView.getTableHeader();
        th.addMouseListener(listMouseListener);
    }
}
