/*
* AbstractReadButton.java 0.0.4 30th December 2000
*
* Copyright (C) 2000 Adam Kirby
*
* <This Java Class is part of the jMusic API version 1.5, March 2004.>
*
* 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.
*/
package jm.util;
import java.awt.Button;
import java.awt.Dialog;
import java.awt.Frame;
import java.awt.Label;
import java.awt.FileDialog;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.io.StreamCorruptedException;
import java.io.IOException;
import java.io.InputStream;
import jm.midi.SMF;
import jm.music.data.Score;
import jm.util.Read;
/**
* A abstract button class which handles reading of MIDI and jMusic files.
*
* This is designed for user interfaces. If exceptions occur a dialog box is
* created and displayed detailing the problem.
*
* If you want the errors to be transparent to your user, or you want to
* manage exception-handling try using the {@link jm.util.Read} class instead.
*
* @author Adam Kirby
* @version 1.0,Sun Feb 25 18:43:56 2001
*/
public abstract class AbstractReadButton extends Button {
/**
* The owner whose control is to be suspended when an error dialog or
* FileDialog appears.
*/
protected Frame owner = null;
/**
* Checks to see whether the file specified is a valid JM or MIDI and if so
* returns its data as a Score. If an error is encountered a dialog box is
* displayed describing the error, and the method returns null.
*
* @param directoryName String describing the directory structure of the
* file to be read
* @param fileName String describing the full name of the file to be
* read
* @return {@link Score} describing the music data in the file,
* or null if an error was encountered.
*/
public Score readFile(final String directoryName, final String fileName) {
if (directoryName == null || fileName == null) {
return null;
}
Score score = null;
String message = null;
/** Attempt to read file */
try {
SMF smf = new SMF();
score = new Score (fileName);
InputStream is = new FileInputStream(directoryName + fileName);
smf.read(is);
jm.midi.MidiParser.SMFToScore(score,smf);
} catch (IOException e1) {
message = e1.getMessage ();
if (message == null) {
message = "Unknown IO Exception";
} else if (message.equals ("Track Started in wrong place!!!!"
+ " ABORTING")) {
message = "The MIDI file corrupted. Track data started in the"
+ " wrong place.";
} else if (message.equals ("This is NOT a MIDI file !!!")) {
try {
FileInputStream fis = new FileInputStream(directoryName
+ fileName);
ObjectInputStream ois = new ObjectInputStream(fis);
score = (Score) ois.readObject ();
ois.close ();
fis.close ();
} catch (SecurityException e2) {
message = "Read access not allowed to " + fileName;
} catch (ClassNotFoundException e2) {
message = "The file " + fileName
+ " is neither a jm or MIDI file";
} catch (ClassCastException e2) {
message = "The file " + fileName
+ " is neither a jm or MIDI file";
} catch (StreamCorruptedException e2) {
message = "The file " + fileName
+ " is neither a jm or MIDI file";
} catch (IOException e2) {
message = e2.getMessage ();
if (message == null) {
message = "Unknown Exception";
}
}
}
}
/** Display error if any */
if (message != null) {
final String finalMessage = message;
new Dialog (owner, "Not a valid MIDI or jMusic File", true) {
{
add (new Label (finalMessage));
addWindowListener (new WindowAdapter () {
public void windowClosing (WindowEvent evt) {
dispose ();
}
}
);
pack ();
}
}.show ();
}
return score;
}
}