jschementi · December 16, 2010 19:08 · Dec 16, 2010
diff --git a/gistfile1.java b/gistfile1.java
@@ -0,0 +1,53 @@
+package earthquake_detector;
+
+import java.util.Map;
+
+import com.buglabs.bug.module.gps.pub.IPositionProvider;
+import com.buglabs.bug.swarm.connector.pub.ISyncFilter;
+
+/**
+ * Given a previous sample and the current sample, determine if the difference is great enough to pass data to the server.
+ * 
+ * @author kgilmer
+ *
+ */
+public class AccelerometerSampleFilter implements ISyncFilter {
+
+	private float lx, ly, lz;
+	private final IPositionProvider positionProvider;
+
+	public AccelerometerSampleFilter(IPositionProvider positionProvider) {
+		this.positionProvider = positionProvider;
+		lx = 0;
+		ly = 0;
+		lz = 0;
+	}
+
+	@Override
+	public boolean synchronize(Map model, Object[] keys) {
+		boolean retVal = false;
+
+		float ac[] = (float []) model.get(Activator.KEY_ACCELERATION);
+
+		if (ac == null) {
+			return false;
+		}
+
+		if (deviates(lx, ac[0], 1) || deviates(ly, ac[1], 1) || deviates(lz, ac[2], 1)) {
+			//Add our current location in since we'll be sending event data to the server.
+			model.put(Activator.KEY_LOCATION, Monitor.positionAsArray(positionProvider.getPosition()));
+			retVal = true;
+		}
+
+		lx = ac[0];
+		ly = ac[1];
+		lz = ac[2];
+
+		return retVal;
+	}
+
+	private boolean deviates(float src, float target, float delta) {
+		return Math.abs(src - target) > delta;
+	}
+
+}