package com.google.common.base;

public final class Stopwatch{
	private long start;
	private long duration;
	
	public Stopwatch() {
	}
	
	public Stopwatch start() {
		start = System.nanoTime();
		duration = 0;
		return this;
	}
	
	public Stopwatch stop() {
		duration = System.nanoTime() - start;
		start = 0;
		return this;
	}
	
	public Stopwatch reset() {
		start = 0;
		duration = 0;
		return this;
	}
	
	public long elapsedNanos() {
		return (start == 0) ? duration : (System.nanoTime() - start);
	}
	
	public long elapsedMillis() {
		return elapsedNanos() / 1000000;
	}
}
@@ -26,16 +26,247 @@
 .base;%0A%0A
+//HBase requires an old version of Guava, and Twitter requires a new one.%0A//HBase only needs the Stopwatch class from guava, so it's simplest to add this class before the actual Guava in the classpath, so HBase sees this old shim.%0A
 public f

Add comment explaining why there is a shim