stop SentenceReader when reading from InputStream and EOF is reached

Change-Id: If6ee824ca27df3fb5561c3afa0809bb624e82414

java/net.sf.marineapi/src/net/sf/marineapi/nmea/io/AbstractDataReader.java

@@ -62,6 +62,10 @@ abstract class AbstractDataReader implements DataReader {
 		return isRunning;
 	}
 
+	protected void setRunning(boolean running) {
+	        isRunning = running;
+	}
+	
 	/**
 	 * Read one line from the data source.
 	 * 
@@ -83,7 +87,9 @@ abstract class AbstractDataReader implements DataReader {
 			try {
 				String data = read();
 				if (data == null) {
-					Thread.sleep(SLEEP_TIME);
+    				        if (isRunning()) {
+    				                Thread.sleep(SLEEP_TIME);
+    				        }
 				} else if (SentenceValidator.isValid(data)) {
 					monitor.refresh();
 					Sentence s = factory.createParser(data);

java/net.sf.marineapi/src/net/sf/marineapi/nmea/io/DefaultDataReader.java

@@ -52,6 +52,10 @@ class DefaultDataReader extends AbstractDataReader {
 	 */
 	@Override
 	public String read() throws Exception {
-		return input.readLine();
+		final String result = input.readLine();
+		if (result == null) {
+		    setRunning(false);
+		}
+		return result;
 	}
 }