Festival.java

package beta;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;

import javax.swing.JButton;
import javax.swing.SwingWorker;

public class Festival extends SwingWorker<Void, Integer>{
	private String _tts;
	private String _voice;
	private JButton _btn;


	//Getting the values to be used.
	public Festival(String tts,String voice) throws Exception{
		this(tts, voice, null);
	}
	//Getting the values to be used.
	public Festival(String tts,String voice, JButton btn) throws Exception{
		_tts=tts;
		_voice = voice;
		_btn = btn;
	}

	//When it is executed, festival is played.
	@Override
	protected Void doInBackground() throws Exception {
		setScheme(_tts, _voice);
		festival();
		return null;
	}

	private void festival() throws Exception{
		//command to be excuted.
		String cmd = "festival -b festival.scm";
		ProcessBuilder builder = new ProcessBuilder("/bin/bash", "-c", cmd);
		//Excute the command
		Process process = builder.start();
		//Wait for the previous process to be finihsed
		process.waitFor();

	}
	
	public void done() {
		if (_btn != null) {
			_btn.setEnabled(true);
		}
	}

	private void setScheme(String tts, String voice) throws IOException{
		File failed = new File("festival.scm");
		//If file does not exist, create new file
		if(!failed.exists()) {
			failed.createNewFile();
		} 

		//Appending the word to the file
		Writer output;
		output = new BufferedWriter(new FileWriter(failed,false)); 
		output.append("(voice_"+_voice+")\n");
		output.append("(Parameter.set 'Duration_Stretch 1.2)");
		String[] lines = tts.split("!!");
		for(int i =0; i<lines.length;i++){
			output.append("(SayText \""+lines[i]+"\")");
		}
		output.close();
	}

	//Get the list of available voice on the current machine.
	public ArrayList<String> listOfVoices() throws Exception{
		ArrayList<String> voice = new ArrayList<String>();

		String cmd = "ls /usr/share/festival/voices/*english* > ./.voices";

		ProcessBuilder builder = new ProcessBuilder("/bin/bash", "-c", cmd);
		//Excute the command
		Process process = builder.start();
		//Wait for the previous process to be finihsed
		process.waitFor();


		BufferedReader file = new BufferedReader(new FileReader("."+File.separator+".voices"));

		String line;

		while ((line = file.readLine()) != null){
			if(!"".equals(line.trim())){
				voice.add(line);
			}
		}

		return voice;
	}

}