Timer


1   package spoon.support.util;
2   
3   import java.util.ArrayList  ;
4   import java.util.List  ;
5   import java.util.Stack  ;
6   
7   /**
8    * A utility class for performance statistics of Spoon.
9    * 
10   * @author Renaud Pawlak
11   */
12  public class Timer {
13      private static List  <Timer> timestamps = new ArrayList  <Timer>();
14  
15      private static Stack  <Timer> current = new Stack  <Timer>();
16  
17      /**
18       * Starts a timer.
19       * 
20       * @param name
21       *            the timer name
22       */
23      public static void start(String   name) {
24          current.push(new Timer(name));
25      }
26  
27      /**
28       * Stops a timer.
29       * 
30       * @param name
31       *            the timer name
32       */
33      public static void stop(String   name) {
34          if (!current.peek().getName().equals(name)) {
35              throw new RuntimeException  ("Must stop last timer");
36          }
37          current.peek().stop();
38          timestamps.add(current.pop());
39      }
40  
41      /**
42       * Displays all the timers.
43       */
44      public static void display() {
45          for (Timer time : timestamps) {
46              System.out.println(time);
47          }
48      }
49  
50      String   name;
51  
52      long start, stop;
53  
54      /**
55       * Constructs a timer.
56       * 
57       * @param name
58       *            the timer name
59       */
60      public Timer(String   name) {
61          super();
62          this.name = name;
63          start = System.currentTimeMillis();
64      }
65  
66      /**
67       * Stops the current timer.
68       */
69      public void stop() {
70          stop = System.currentTimeMillis();
71      }
72  
73      /**
74       * Gets this timer's name.
75       * 
76       * @return
77       */
78      public String   getName() {
79          return name;
80      }
81  
82      /**
83       * Gets the current time of this timer.
84       */
85      public long getValue() {
86          return stop - start;
87      }
88  
89      /**
90       * A string representation of this timer.
91       */
92      @Override  
93      public String   toString() {
94          return getName() + " \t" + getValue() + "ms";
95      }
96  
97  }
98
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