001/**
002 * Copyright (C) 2014  Universidade de Aveiro, DETI/IEETA, Bioinformatics Group - http://bioinformatics.ua.pt/
003 *
004 * This file is part of Dicoogle/dicoogle.
005 *
006 * Dicoogle/dicoogle is free software: you can redistribute it and/or modify
007 * it under the terms of the GNU General Public License as published by
008 * the Free Software Foundation, either version 3 of the License, or
009 * (at your option) any later version.
010 *
011 * Dicoogle/dicoogle is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014 * GNU General Public License for more details.
015 *
016 * You should have received a copy of the GNU General Public License
017 * along with Dicoogle.  If not, see <http://www.gnu.org/licenses/>.
018 */
019package pt.ua.dicoogle.core;
020
021import java.io.FileInputStream;
022import java.io.FileOutputStream;
023import java.io.ObjectInput;
024import java.io.ObjectInputStream;
025import java.io.ObjectOutput;
026import java.io.ObjectOutputStream;
027import java.util.ArrayList;
028import java.util.Iterator;
029import java.util.Observable;
030
031import pt.ua.dicoogle.sdk.Utils.Platform;
032
033/**
034 *
035 * @author Samuel da Costa Campos <samuelcampos@ua.pt>
036 */
037public class QueryHistorySupport extends Observable {
038
039    //consider replacing this data type "ArrayList<SimpleEntry<String, Boolean>>"
040    private ArrayList<QueryHistoryEntry<String, Boolean>> queryHistory;
041
042    private static String fileName = Platform.homePath() + "QueryHistory.ser";
043
044    private static QueryHistorySupport instance = null;
045
046    public static synchronized QueryHistorySupport getInstance()
047    {
048        if (instance == null) {
049            instance = new QueryHistorySupport();
050        }
051        return instance;
052    }
053
054    private QueryHistorySupport(){
055        if(!loadQueryHistory())
056            queryHistory = new ArrayList<QueryHistoryEntry<String, Boolean>>();
057
058    }
059
060    private boolean loadQueryHistory(){
061        try {
062            ObjectInput in = new ObjectInputStream(new FileInputStream(fileName));
063            queryHistory = (ArrayList<QueryHistoryEntry<String, Boolean>>) in.readObject();
064            in.close();
065
066            return true;
067        } catch (Exception ex) {
068            return false;
069        }
070    }
071
072    public Iterator<QueryHistoryEntry<String, Boolean>> getQueryHistory(){
073        return queryHistory.iterator();
074    }
075
076    public boolean saveQueryHistory(){
077        try {
078            ObjectOutput out = new ObjectOutputStream(new FileOutputStream(fileName));
079            out.writeObject(queryHistory);
080            out.close();
081
082            return true;
083        } catch (Exception ex) {
084            return false;
085        }
086    }
087
088    public void addQuery(String query, boolean keywords){
089        QueryHistoryEntry<String, Boolean> entry = new QueryHistoryEntry<String, Boolean>(query, keywords);
090
091        if(!queryHistory.contains(entry))
092            queryHistory.add(entry);
093        
094        setChanged();
095        notifyObservers();
096    }
097
098    public boolean deleteQuery(QueryHistoryEntry<String, Boolean> entry){
099        boolean result = queryHistory.remove(entry);
100        
101        setChanged();
102        notifyObservers();
103
104        return result;
105    }
106
107    public void deleteAll(){
108        queryHistory.clear();
109
110        setChanged();
111        notifyObservers();
112    }
113}