Application: gvSIG desktop » gvSIG raster

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * 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., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.raster.swing.impl.pagedtable;

import java.util.ArrayList;

import java.util.List;

import java.util.Observable;

/**

 * @author Nacho Brodin (nachobrodin@gmail.com)

 */

public class Pager extends Observable {

        private List<Object>             entries                = null;

        private int                      entriesPerPage         = 0;

        private int                      selectedPage           = 0;

        private int[]                    selectedRows           = null;

        public static int                EVENT_SELECTED_ROWS    = 0;

        public static int                EVENT_ADD_ENTRY        = 1; 

        public static int                EVENT_REMOVE_ENTRY     = 2;

        public static int                EVENT_REMOVE_ALL       = 3;

        public static int                EVENT_SELECTED_PAGE    = 4;

        public Pager(int entriesPerPage) {

                this.entriesPerPage = entriesPerPage;

                entries = new ArrayList<Object>();

        }

        //*************ROWS**********************

        public void setSelectedRows(int[] rows) {

                selectedRows = rows;

                setChanged();

            notifyObservers(EVENT_SELECTED_ROWS);

        }

        public void increaseSelectedRows() {

                boolean change = false;

                for (int i = 0; i < selectedRows.length; i++) {

                        if(selectedRows[i] < getEntriesCount()) {

                                selectedRows[i] ++;

                                change = true;

                        }

                }

                if(change) {

                        setChanged();

                        notifyObservers(EVENT_SELECTED_ROWS);

                }

        }

        public void decreaseSelectedRows() {

                boolean change = false;

                for (int i = 0; i < selectedRows.length; i++) {

                        if(selectedRows[i] > 0) {

                                selectedRows[i] --;

                                change = true;

                        }

                }

                if(change) {

                        setChanged();

                        notifyObservers(EVENT_SELECTED_ROWS);

                }

        }

        public void addSelectedRow(int row) {

                int[] newSelected = new int[selectedRows.length + 1];

                for (int i = 0; i < selectedRows.length; i++) {

                        newSelected[i] = selectedRows[i];

                }

                newSelected[newSelected.length - 1] = row;

                selectedRows = newSelected;

                setChanged();

            notifyObservers(EVENT_SELECTED_ROWS);

        }

        public int[] getSelectedRows() {

                return selectedRows;

        }

        /**

         * Adds a new entry. In the first place, if it is necessary 

         * changes the selected page and throws the event to actualize the

         * table and controls. Next it will notify the "add entry" event 

         * 

         * @param entry

         */

        public void addEntry(Object entry) {

                int newSelectedRow = entries.size();

                if(!isInCurrentPage(newSelectedRow)) {

                        setSelectedPage(getPageFromRow(newSelectedRow));

                        setChanged();

                    notifyObservers(EVENT_SELECTED_PAGE);

                }

                entries.add(entry);

                setChanged();

            notifyObservers(EVENT_ADD_ENTRY);

            setSelectedRows(new int[]{newSelectedRow});

        }

        public void removeEntry(int pos) {

                if(pos >= 0 && pos < entries.size()) {

                        int oldSelectedPageInRow = getPageFromRow(pos);

                        int oldSelectedPage = getSelectedPageNumber();

                        entries.remove(pos);

                        if(isRowSelected(pos)) {

                                //La p?gina donde est? la entrada a borrar est? en la p?gina seleccionada

                                if(oldSelectedPageInRow == oldSelectedPage) { 

                                        int newRowSelected = selectAlternativeRow(pos);

                                        int newPageSelected = getPageFromRow(newRowSelected);

                                        if(newPageSelected != oldSelectedPage) {

                                                setSelectedPage(newPageSelected);

                                                setChanged();

                                            notifyObservers(EVENT_SELECTED_PAGE);

                                            return;

                                        }

                                }

                        } 

                        setChanged();

                        notifyObservers(EVENT_REMOVE_ENTRY);

                }

        }

        private int selectAlternativeRow(int row) {

                for (int i = 0; i < selectedRows.length; i++) {

                        if(selectedRows[i] == row && selectedRows[i] != 0) {

                                selectedRows[i] --;

                                return selectedRows[i];

                        }

                }

                return row;

        }

        private boolean isRowSelected(int row) {

                for (int i = 0; i < selectedRows.length; i++) {

                        if(selectedRows[i] == row)

                                return true;

                }

                return false;

        }

        public void swapRow(int i, int j) {

                if(i == j)

                        return;

                if(j < i) {

                        int aux = i;

                        i = j;

                        j = aux;

                }

                Object a = entries.get(i);

                Object b = entries.get(j);

                entries.add(i, b);

                entries.remove(i + 1);

                entries.add(j, a);

                entries.remove(j + 1);

                //setChanged();

            //notifyObservers(CHANGE_REMOVE_ALL);

        }

        public boolean isSelectedRow(int row) {

                for (int i = 0; i < selectedRows.length; i++) {

                        if(selectedRows[i] == row)

                                return true;

                }

                return false;

        }

        public int getEntriesCount() {

                return entries.size();

        }

        public Object[] getLastEntry() {

                return (Object[])entries.get(entries.size() - 1);

        }

        public void removeAllEntries() {

                entries.clear();

                setChanged();

            notifyObservers(EVENT_REMOVE_ALL);

        }

        //*************PAGE**********************

        public void setEntriesPerPage(int n) {

                this.entriesPerPage = n;

                setChanged();

            notifyObservers(EVENT_SELECTED_PAGE);

        }

        public void increaseSelectedPage() {

                if(selectedPage < getPageCount() - 1) {

                        selectedPage ++;

                        setChanged();

                    notifyObservers(EVENT_SELECTED_PAGE);

                }

        }

        public void decreaseSelectedPage() {

                if (selectedPage > 0) {

                        selectedPage --;

                        setChanged();

                    notifyObservers(EVENT_SELECTED_PAGE);

                }

        }

        public void setSelectedPage(int page) {

                if(page >= 0 && page < getPageCount()) {

                        selectedPage = page;

                        setChanged();

                    notifyObservers(EVENT_SELECTED_PAGE);

                }

        }

        public int getPageFromRow(int row) {

                return (int)(row / getEntriesPerPage());

        }

        public List<Object> getSelectedPage() {

                return getPage(getSelectedPageNumber());

        }

        public void removePage(int page) {

                if(page >= 0 && page < getPageCount()) {

                        int init = entriesPerPage * page;

                        int end = init + entriesPerPage;

                        for (int i = end - 1; i >= init; i--) {

                                entries.remove(i);

                        }

                }

        }

        public int getPageCount() {

                return (int)Math.ceil(entries.size() / (double)entriesPerPage);

        }

        public boolean isInCurrentPage(int row) {

                int init = selectedPage * getEntriesPerPage();

                int end = init + getEntriesPerPage() - 1;

                if(row >= init && row <= end)

                        return true;

                return false;

        }

        public List<Object> getPage(int page) {

                if(page >= 0 && page < getPageCount()) {

                        int init = entriesPerPage * page;

                        int end = init + entriesPerPage;

                        end = end >= entries.size() ? entries.size() : end;

                        return entries.subList(init, end);

                }

                return null;

        }

        public int getEntriesPerPage() {

                return entriesPerPage;

        }

        public int getSelectedPageNumber() {

                if(selectedPage >= getPageCount()) {

                        selectedPage = getPageCount() - 1;

                        if(selectedPage < 0)

                                selectedPage = 0;

                }

                return selectedPage;

        }

}