package org.hotswap.agent.watch;
import org.hotswap.agent.watch.nio.WatcherNIO2;
import java.io.IOException;
/**
* Resolve watcher from java version (Java NIO2 implementation is preferred if available.)
*
* @author Jiri Bubnik
*/
public class WatcherFactory {
public static double JAVA_VERSION = getVersion();
static double getVersion() {
String version = System.getProperty("java.version");
int pos = 0, count = 0;
for (; pos < version.length() && count < 2; pos++) {
if (version.charAt(pos) == '.') count++;
}
return Double.parseDouble(version.substring(0, pos - 1));
}
public Watcher getWatcher() throws IOException {
if (JAVA_VERSION >= 1.7) {
return new WatcherNIO2();
} else {
throw new UnsupportedOperationException("Watcher is implemented only for Java 1.7 (NIO2). " +
"JNotify implementation should be added in the future for older Java version support.");
}
}
}