1 files changed, 74 insertions, 0 deletions
diff --git a/statistics/src/main/java/com/yahoo/statistics/Sum.java b/statistics/src/main/java/com/yahoo/statistics/Sum.java
new file mode 100644
index 00000000000..87662e38560
--- /dev/null
+++ b/statistics/src/main/java/com/yahoo/statistics/Sum.java
@@ -0,0 +1,74 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.statistics;
+
+import java.util.List;
+
+
+/**
+ * The innermost part of a histogram, a bucket which only contains a
+ * counter.
+ *
+ * @author  <a href="mailto:steinar@yahoo-inc.com">Steinar Knutsen</a>
+ */
+class Sum implements Bucket {
+    private long sum = 0L;
+    private double lower;
+    private double upper;
+
+    Sum(double lower, double upper) {
+        this.lower = lower;
+        this.upper = upper;
+    }
+
+    /**
+     * Increment this bucket.
+     */
+    public void put(double[] value, int dim) {
+        sum += 1;
+    }
+
+    /**
+     * Set this bucket's count to 0.
+     */
+    public void reset() {
+        sum = 0L;
+    }
+
+    /**
+     * The lower limit for values counted by this bucket.
+     */
+    public double lowerLimit() {
+        return lower;
+    }
+
+    /**
+     * The upper limit for values counted by this bucket.
+     */
+    public double upperLimit() {
+        return upper;
+    }
+
+    public String toString() {
+        return Long.toString(sum);
+    }
+
+    @Override
+    public List<Bucket> getBuckets() {
+        return null;
+    }
+
+    @Override
+    public boolean isLeaf() {
+        return true;
+    }
+
+    @Override
+    public long getSum() {
+        return sum;
+    }
+
+    @Override
+    public void add(long n) {
+        sum += n;
+    }
+}