1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements.  See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License.  You may obtain a copy of the License at
8  *
9  *   http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  *
17  */
18 
19 package org.apache.bcel;
20 
21 public class NanoTimer {
22 
23     private long time = 0;
24 
start()25     public NanoTimer start() {
26         time -= System.nanoTime();
27         return this;
28     }
29 
stop()30     public void stop() {
31         time += System.nanoTime();
32     }
33 
subtract(final NanoTimer o)34     public void subtract(final NanoTimer o) {
35         time -= o.time;
36     }
37 
reset()38     public void reset() {
39         time = 0;
40     }
41 
42     /**
43      * May ony be called after stop has been called as many times as start.
44      */
45     @Override
toString()46     public String toString() {
47         return ((double) time / 1000000000) + " s";
48     }
49 
50 
51 
52 }
53