channelfactory.java

JavaTV Program source code Need to play Windows Media files and streams, mpeg4 video or DVDs in j

/*
 * Copyright (C) 2005 by Enrico Chiaretti - [e-mail]
 
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.,
 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 * ChannelFactory.java
 *
 * Created on 5 giugno 2005, 13.29
 */

/** this class creates / reads the channel list
 * @author enrico chiaretti
 */
public class ChannelFactory
{
    
    private java.util.Vector mChannels = null;
    private static int ST_INIT = -1;
    private static int ST_READY = 0;
    private static int ST_EOL = 1;
    private static int ST_EOF = 2;
    private int mstatus = -1;
    /**
     * Creates a new instance of ChannelFactory.
     * the default constructor generates my favorites channels and frequencies.
     * Moreover, it reads the user home directory, needed to save the channel list
     * text file.
     */
    // creates the default channel list: PAL ITALY, Monte Nerone
    public ChannelFactory()
    {
        mChannels = new java.util.Vector();
        defaultChannels();
    }
    
    public ChannelFactory(java.util.Vector aChanList)
    {
        mChannels = aChanList;
    }
    /**
     * Creates a new instance of ChannelFactory.
     * reads the channels from file. If fails, create the default list
     * @param TextFile this tells where to load / save the channel list text file, so the end user can
     * edit at his own will.
     */
    public ChannelFactory(String TextFile)
    {
        mChannels = new java.util.Vector();
        read(TextFile);
    }
    
    private void defaultChannels()
    {
        mChannels.clear();
        mChannels.add(new TvChannel(1,   "Rai1", "E", "",    183750));
        mChannels.add(new TvChannel(2,	"Rai2",	"33", "",   567250));
        mChannels.add(new TvChannel(3,	"Rai3",	"54", "",   735250));
        mChannels.add(new TvChannel(4,	"Rete4","34", "", 	575250));
        mChannels.add(new TvChannel(5,	"Canale5", "39", "", 615250));
        mChannels.add(new TvChannel(6,	"Italia1",	"50", "",	703250));
        mChannels.add(new TvChannel(7,	"7Gold"	,"68", "Italia 7 Gold", 	847250));
        mChannels.add(new TvChannel(8,	"La8",	"38", "", 607250));
        mChannels.add(new TvChannel(9,	"TeleCentro", "60", "", 783250));
        mChannels.add(new TvChannel(10, 	"TeleRomagna",	"49", "",	695250));
        mChannels.add(new TvChannel(11,	"ITV",	"57", "", 759250));
        mChannels.add(new TvChannel(12,	"MTV",	"28", "",	527250));
        mChannels.add(new TvChannel(13,	"TeleSanterno",	"63", "",	807250));
        mChannels.add(new TvChannel(14,	"SanMarino",	"H1", "",	217250));
        mChannels.add(new TvChannel(15,	"SI",	"45", "",	663250));
        mChannels.add(new TvChannel(16,	"Tele2000",	"29", "",	535250));
        mChannels.add(new TvChannel(17,	"VCR",	"36", "Video Tape Recorder",	591250));
    }
    
    
    /** returns the active channel list to be displaied on the user form
     * @return returns a Vector of TvChannel
     */
    public java.util.Vector getChannels()
    {
        // this is my default channel list, based on the italian frequencies
        /*
         * future release:
         * read channel list from a text file.
         * eventually, build a list editor form to add / change / remove channels
         */
        return mChannels;
    }
    
    /**
     * this saves the channel list into a text file.
     * @param FileName this tells where to save the channel list text file
     */
    public void save(String FileName) throws java.io.IOException
    {
        java.io.FileWriter OutFile = null;
        TvChannel CurrChan = null;
        String sFreq = null;
        int i;
        
        OutFile = new java.io.FileWriter(FileName);

        for (i=0;i<mChannels.size();i++)
        {
            CurrChan = (TvChannel) mChannels.get(i);
            if (CurrChan.freq.longValue() == 0)
            {
                sFreq = "";
            }
            else
            {
                sFreq = CurrChan.freq.toString();
            }
            OutFile.write(CurrChan.name + ", " + CurrChan.number + ", " + CurrChan.description + ", " + sFreq + ";\n");
            System.out.println(CurrChan.index + ", " + CurrChan.name + ", " + CurrChan.number + ", " + CurrChan.description + ", " + sFreq);
        }
        OutFile.close();
    }
    
    /**
     * this reads the channel list from the text file
     * @param FileName this tells where to read the list from
     */
    public void read(String FileName)
    {
        java.io.FileReader InFile = null;
        String ChanName = null;
        String ChanDesc = null;
        String ChanNum = null;
        long chanFreq = 0;
        
        mstatus = ST_INIT;
        try
        {
            InFile = new java.io.FileReader(FileName);
            
            while(mstatus != ST_EOF)
            {
                ChanName = readWord(InFile); // required
                ChanNum  = readWord(InFile); // required
                
                ChanDesc = readWord(InFile); // optional!!
                if (mstatus == ST_EOL)
                {
                    // I just read frequency, not description!
                    chanFreq = new Long(ChanDesc).longValue();
                    ChanDesc = "";
                }
                else
                {
                    // now I can read frequency
                    try
                    {
                        chanFreq = new Long(readWord(InFile)).longValue();
                    }
                    catch (Exception e) {};
                }
                
                if (ChanName.length() > 0)
                {
                    mChannels.add(new TvChannel(mChannels.size() + 1, ChanName, ChanNum, ChanDesc, chanFreq));
                }
            }
            
            InFile.close();
        }
        catch (Exception e)
        {
            if (mChannels.size() == 0)
            {
                System.out.println("Error reading Channel List: not well formed!");
                defaultChannels();
            }
        }
        
    }
    
    private String readWord(java.io.FileReader aInFile) throws java.io.IOException
    {
        StringBuffer Buf = new StringBuffer();
        int i = -1;
        char c = ' ';
        
        mstatus = ST_INIT;
        
        while(aInFile.ready() && mstatus == ST_INIT)
        {
            i = aInFile.read();
            switch (i)
            {
                case ',':
                    mstatus = ST_READY;
                    break;
                case ';':
                    mstatus = ST_EOL;
                    break;
                case -1:
                    break; // End of file!
                case '\t':
                case '\n':
                    // skip char
                default:
                    Buf.append((char) i);
            }
            
            
        }
        
        if (Buf.length() == 0 && i == -1)
        {
            mstatus = ST_EOF;
        }
        
        return Buf.toString().trim();
    }
}