/*******************************************************************************
* Copyright (c) 2009-2010 Philipp Dörfler
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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******************************************************************************/
package con;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Set;
import java.util.TreeSet;
import con.exception.NoControllerFoundException;
class Gamepads {
static int firstFound() {
final Set<Integer> discoveredPads = discoverPads();
if (discoveredPads.isEmpty()) {
throw new NoControllerFoundException();
}
return discoveredPads.iterator().next();
}
private static Set<Integer> discoverPads() {
int i = 0;
boolean exists = true;
final Set<Integer> padsFound = new TreeSet<Integer>();
while (exists) {
exists = probe(i);
if (exists) {
padsFound.add(i);
}
i++;
}
return padsFound;
}
private static boolean probe(int i) {
try {
new FileInputStream(GamepadFilename.forPad(i));
} catch (IOException e) {
return false; // TODO Check sub-exceptions. May be better suited
}
return true;
}
}