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