|
1 package com.db4o.f1.chapter5;
2
3 import java.util.*;
4
5 public class Car {
6 private String  model;
7 private Pilot pilot;
8 private SensorReadout history;
9
10 public Car(String model) {
11 this.model=model;
12 this.pilot=null;
13 this.history=null;
14 }
15
16 public Pilot getPilot() {
17 return pilot;
18 }
19
20 public void setPilot(Pilot pilot) {
21 this.pilot=pilot;
22 }
23
24 public String getModel() {
25 return model;
26 }
27
28 public SensorReadout getHistory() {
29 return history;
30 }
31
32 public void snapshot() {
33 appendToHistory(new TemperatureSensorReadout(
34 new Date(),this,"oil",pollOilTemperature()));
35 appendToHistory(new TemperatureSensorReadout(
36 new Date(),this,"water",pollWaterTemperature()));
37 appendToHistory(new PressureSensorReadout(
38 new Date(),this,"oil",pollOilPressure()));
39 }
40
41 protected double pollOilTemperature() {
42 return 0.1*countHistoryElements();
43 }
44
45 protected double pollWaterTemperature() {
46 return 0.2*countHistoryElements();
47 }
48
49 protected double pollOilPressure() {
50 return 0.3*countHistoryElements();
51 }
52
53 public String toString() {
54 return model+"["+pilot+"]/"+countHistoryElements();
55 }
56
57 private int countHistoryElements() {
58 return (history==null ? 0 : history.countElements());
59 }
60
61 private void appendToHistory(SensorReadout readout) {
62 if(history==null) {
63 history=readout;
64 }
65 else {
66 history.append(readout);
67 }
68 }
69 } |
Popular Tags |
Java API By Example, From Geeks To Geeks.