Extracted the Bang stats system into reusable land. Too late for Yohoho, but

Whirled will benefit.


git-svn-id: svn+ssh://src.earth.threerings.net/vilya/trunk@251 c613c5cb-e716-0410-b11b-feb51c14d237

src/java/com/threerings/stats/data/MaxIntStat.java

@@ -0,0 +1,61 @@
+//
+// $Id$
+
+package com.threerings.stats.data;
+
+import java.io.IOException;
+import java.io.EOFException;
+
+import com.threerings.io.ObjectInputStream;
+import com.threerings.io.ObjectOutputStream;
+
+/**
+ * Extends the {@link IntStat} by maintaining a maximum value which is updated every time a value
+ * is accumulated to the stat. Thus we track an accumulating value as well as the largest amount by
+ * which it has ever accumulated.
+ */
+public class MaxIntStat extends IntStat
+{
+    /**
+     * Returns the maximum value every accumulated to this integer statistic.
+     */
+    public int getMaxValue ()
+    {
+        return _maxValue;
+    }
+
+    @Override // from IntStat
+    public boolean increment (int delta)
+    {
+        if (super.increment(delta)) {
+            _maxValue = Math.max(delta, _maxValue);
+            return true;
+        }
+        return false;
+    }
+
+    @Override // from IntStat
+    public String valueToString ()
+    {
+        return super.valueToString() + " " + String.valueOf(_maxValue);
+    }
+
+    @Override // from IntStat
+    public void persistTo (ObjectOutputStream out, AuxDataSource aux)
+        throws IOException
+    {
+        super.persistTo(out, aux);
+        out.writeInt(_maxValue);
+    }
+
+    @Override // from IntStat
+    public void unpersistFrom (ObjectInputStream in, AuxDataSource aux)
+        throws IOException, ClassNotFoundException
+    {
+        super.unpersistFrom(in, aux);
+        _maxValue = in.readInt();
+    }
+
+    /** The largest value ever accumulated to this stat. */
+    protected int _maxValue;
+}