Merge pull request #42 from JeffersonLab/qtl

Add random wagon for Chris

src/main/java/org/jlab/jnp/grapes/services/RandomWagon.java

@@ -0,0 +1,37 @@
+package org.jlab.jnp.grapes.services;
+
+import java.util.Random;
+import org.jlab.jnp.hipo4.data.Event;
+import org.jlab.jnp.hipo4.data.SchemaFactory;
+import org.jlab.jnp.utils.json.Json;
+import org.jlab.jnp.utils.json.JsonObject;
+
+/**
+ *
+ * @author baltzell
+ */
+public class RandomWagon extends Wagon {
+
+    boolean includeTags = true;
+    double prescale = 100.0f;
+    Random random = new Random();
+
+    public RandomWagon() {
+        super("RandomWagon", "baltzell", "1.0");
+    }
+
+    @Override
+    public boolean processDataEvent(Event event, SchemaFactory factory) {
+        if (includeTags && event.getEventTag() != 0) return true;
+        return random.nextFloat(1.0f) < 1./prescale;
+    }
+
+    @Override
+    public boolean init(String jsonString) {
+        JsonObject jsonObj = Json.parse(jsonString).asObject();
+        prescale = jsonObj.getDouble("prescale",prescale);
+        includeTags = jsonObj.getBoolean("includeTags",includeTags);
+        return true;
+    }
+
+}