path: root/e-util/e-sorter-array.c

/*
 * This program 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 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#include <config.h>

#include <stdlib.h>
#include <string.h>

#include "e-sorter-array.h"
#include "e-util.h"

#define d(x)

#define INCREMENT_AMOUNT 100

G_DEFINE_TYPE (
    ESorterArray,
    e_sorter_array,
    E_SORTER_TYPE)

static void esa_sort               (ESorterArray *esa);
static void esa_backsort           (ESorterArray *esa);

static gint esa_model_to_sorted           (ESorter *sorter, gint row);
static gint esa_sorted_to_model           (ESorter *sorter, gint row);
static void esa_get_model_to_sorted_array (ESorter *sorter, gint **array, gint *count);
static void esa_get_sorted_to_model_array (ESorter *sorter, gint **array, gint *count);
static gboolean esa_needs_sorting             (ESorter *esa);

#define ESA_NEEDS_SORTING(esa) (((ESorterArray *) (esa))->compare != NULL)

static gint
esort_callback(gconstpointer data1, gconstpointer data2, gpointer user_data)
{
    ESorterArray *esa = user_data;
    gint ret_val;
    gint int1, int2;

    int1 = *(gint *)data1;
    int2 = *(gint *)data2;

    ret_val = esa->compare (int1, int2, esa->closure);
    if (ret_val != 0)
        return ret_val;

    if (int1 < int2)
        return -1;
    if (int1 > int2)
        return 1;
    return 0;
}

static void
esa_sort(ESorterArray *esa)
{
    gint rows;
    gint i;

    if (esa->sorted)
        return;

    rows = esa->rows;

    esa->sorted = g_new(int, rows);
    for (i = 0; i < rows; i++)
        esa->sorted[i] = i;

    if (esa->compare)
        g_qsort_with_data (
            esa->sorted, rows, sizeof(gint),
            esort_callback, esa);
}

static void
esa_backsort(ESorterArray *esa)
{
    gint i, rows;

    if (esa->backsorted)
        return;

    esa_sort(esa);

    rows = esa->rows;

    esa->backsorted = g_new0(int, rows);

    for (i = 0; i < rows; i++) {
        esa->backsorted[esa->sorted[i]] = i;
    }
}

static gint
esa_model_to_sorted (ESorter *es, gint row)
{
    ESorterArray *esa = E_SORTER_ARRAY(es);

    g_return_val_if_fail(row >= 0, -1);
    g_return_val_if_fail(row < esa->rows, -1);

    if (ESA_NEEDS_SORTING(es))
        esa_backsort(esa);

    if (esa->backsorted)
        return esa->backsorted[row];
    else
        return row;
}

static gint
esa_sorted_to_model (ESorter *es, gint row)
{
    ESorterArray *esa = (ESorterArray *) es;

    g_return_val_if_fail(row >= 0, -1);
    g_return_val_if_fail(row < esa->rows, -1);

    if (ESA_NEEDS_SORTING(es))
        esa_sort(esa);

    if (esa->sorted)
        return esa->sorted[row];
    else
        return row;
}

static void
esa_get_model_to_sorted_array (ESorter *es, gint **array, gint *count)
{
    ESorterArray *esa = E_SORTER_ARRAY(es);
    if (array || count) {
        esa_backsort(esa);

        if (array)
            *array = esa->backsorted;
        if (count)
            *count = esa->rows;
    }
}

static void
esa_get_sorted_to_model_array (ESorter *es, gint **array, gint *count)
{
    ESorterArray *esa = E_SORTER_ARRAY(es);
    if (array || count) {
        esa_sort(esa);

        if (array)
            *array = esa->sorted;
        if (count)
            *count = esa->rows;
    }
}

static gboolean
esa_needs_sorting(ESorter *es)
{
    ESorterArray *esa = E_SORTER_ARRAY(es);
    return esa->compare != NULL;
}

void
e_sorter_array_clean(ESorterArray *esa)
{
    g_free(esa->sorted);
    esa->sorted = NULL;

    g_free(esa->backsorted);
    esa->backsorted = NULL;
}

void
e_sorter_array_set_count  (ESorterArray *esa, gint count)
{
    e_sorter_array_clean (esa);
    esa->rows = count;
}

void
e_sorter_array_append  (ESorterArray *esa, gint count)
{
    gint i;
    g_free(esa->backsorted);
    esa->backsorted = NULL;

    if (esa->sorted) {
        esa->sorted = g_renew(int, esa->sorted, esa->rows + count);
        for (i = 0; i < count; i++) {
            gint value = esa->rows;
            gsize pos;

            e_bsearch (
                &value, esa->sorted, esa->rows,
                sizeof (gint), esort_callback, esa, &pos, NULL);
            memmove (
                esa->sorted + pos + 1,
                esa->sorted + pos,
                sizeof (gint) * (esa->rows - pos));
            esa->sorted[pos] = value;
            esa->rows++;
        }
    } else {
        esa->rows += count;
    }
}

ESorterArray *
e_sorter_array_construct  (ESorterArray *esa,
               ECompareRowsFunc  compare,
               gpointer      closure)
{
    esa->compare = compare;
    esa->closure = closure;
    return esa;
}

ESorterArray *
e_sorter_array_new (ECompareRowsFunc compare, gpointer closure)
{
    ESorterArray *esa = g_object_new (E_SORTER_ARRAY_TYPE, NULL);

    return e_sorter_array_construct (esa, compare, closure);
}

static void
e_sorter_array_class_init (ESorterArrayClass *klass)
{
    ESorterClass *sorter_class = E_SORTER_CLASS(klass);

    sorter_class->model_to_sorted           = esa_model_to_sorted;
    sorter_class->sorted_to_model           = esa_sorted_to_model;
    sorter_class->get_model_to_sorted_array = esa_get_model_to_sorted_array;
    sorter_class->get_sorted_to_model_array = esa_get_sorted_to_model_array;
    sorter_class->needs_sorting             = esa_needs_sorting;
}

static void
e_sorter_array_init (ESorterArray *esa)
{
    esa->rows       = 0;
    esa->compare    = NULL;
    esa->closure    = NULL;
    esa->sorted     = NULL;
    esa->backsorted = NULL;
}