initial

app/src/main/java/net/heartshield/data/MeasurementId.java

@@ -0,0 +1,38 @@
+package net.heartshield.data;
+
+import java.io.Serializable;
+
+/**
+ * Primary key for identifying a Measurement.
+ *
+ * @author David Madl (git@abanbytes.eu)
+ * @date 2017-04-10
+ */
+public class MeasurementId implements Serializable {
+    public String appId;
+    public long startTime;
+
+    public MeasurementId(String appId, long startTime) {
+        this.appId = appId;
+        this.startTime = startTime;
+    }
+
+    public static MeasurementId parse(String measurementId) {
+        int underscore = measurementId.indexOf("_");
+        if(underscore == -1)
+            throw new IllegalArgumentException("could not parse measurementId " + measurementId + " since it did not contain '_'.");
+        return new MeasurementId(measurementId.substring(underscore+1), Long.parseLong(measurementId.substring(0, underscore)));
+    }
+
+    public String toString() {
+        return startTime + "_" + appId;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if(obj == null || !(obj instanceof MeasurementId))
+            return false;
+        MeasurementId other = (MeasurementId) obj;
+        return (this.startTime == other.startTime && this.appId.equals(other.appId));
+    }
+}