Page 168 - The Definitive Guide to Building Java Robots

Preston_5564C05.fm Page 149 Tuesday, September 20, 2005 5:13 AM

CHAPTER 5 ■ SPEECH 149

Example 5-9. MicrosoftVoice.java
package com.scottpreston.javarobot.chapter5;

public class MicrosoftVoice implements JVoice {

// worker class for voice
private QuadmoreTTS voice;
// private instance to ensure only one is active
private static MicrosoftVoice instance;

// private constructor prevents initialization
// called by getInstance
private MicrosoftVoice() {
voice = new QuadmoreTTS();
}

// static methods ensure one instance per class
public static MicrosoftVoice getInstance() throws Exception {
if (instance == null) {
// returns self
instance = new MicrosoftVoice();
}
return instance;
}

public void open() {
// do nothing
}

public void close() {
// do nothing
}

//speak, otherwise throw exception
public void speak(String s) throws Exception {
if (!voice.SpeakDarling(s)) {
throw new Exception("Unable to speak");
}
}

// sample usage
public static void main(String args[]) {
try {
MicrosoftVoice v = MicrosoftVoice.getInstance();
v.speak("Java Robots Are Cool!");