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package Jcd; // -- Listing-5 -- SmartDrive.java 1
// 2
import java.io.*; // 3
import java.util.*; // 4
import java.awt.*; // 5
import Jcd.Drive; // 6
import Jcd.Monitor; // 7
// 8
class SmartDrive
extends Drive implements Observer { // 9
// 10
public Monitor monitor; // 11
public TrackList tracksToPlay = null; // 12
public int program_pos = 0; // 13
public boolean singleMode = false; // 14
// 15
public SmartDrive(String device, // 16
String module, int flags)
{ // 17
super(device, module, flags); // 18
setUp(); // 19
} // 20
// 21
protected void setUp() // 22
{ // 23
monitor = new Monitor(this); // 24
monitor.addObserver(this); // 25
tracksToPlay = new TrackList(30); // 26
} // 27
// 28
public void setSingleMode(boolean state) // 29
{ // 30
singleMode = state; // 31
} // 32
// 33
public void play(int track) // 34
throws DriveException
{ // 35
if (singleMode) single(track); // 36
else super.play(track); // 37
} // 38
// 39
public boolean startPlaying() // 40
throws DriveException
{ // 41
if (status() == Drive.STATUS_PAUSED) // 42
resume(); // 43
else if (!tracksToPlay.isEmpty()) { // 44
if (tracksToPlay.atEnd()) // 45
tracksToPlay.reset(); // 46
play(tracksToPlay.nextTrack()); // 47
} // 48
else play(1); // 49
return true; // 50
} // 51
// 52
public boolean next() throws DriveException// 53
{ // 54
if (tracksToPlay.isEmpty()) { // 55
int track = currentTrack(); // 56
int max = numberOfTracks(); // 57
if (track >= max) return false; // 58
play(track + 1); // 59
} // 60
else { // 61
int next = tracksToPlay.nextTrack(); // 62
if (next <= 0) // 63
return false; // 64
play(next); // 65
} // 66
return true; // 67
} // 68
// 69
public boolean prev() throws DriveException// 70
{ // 71
if (tracksToPlay.isEmpty()) { // 72
int track = currentTrack(); // 73
if (track <= 1) return false; // 74
play(track - 1); // 75
} // 76
else { // 77
int next = tracksToPlay.prevTrack(); // 78
if (next <= 0) return false; // 79
play(next); // 80
} // 81
return true; // 82
} // 83
// 84
public int remaining() // 85
{ // 86
int result = 0; // 87
if (tracksToPlay.isEmpty()) // 88
result = monitor.cdEndAddress -
monitor.currentAddress; // 89
else { // 90
int index = 0; // 91
Enumeration iter = tracksToPlay.elements();
while (iter.hasMoreElements()) { // 93
int track = // 94
((Integer) iter.nextElement()).intValue();
if (index >= tracksToPlay.stepNumber() &&
track < monitor.trackLength.length) {
result += monitor.trackLength[track];
} // 98
index++; // 99
} // 100
if (!tracksToPlay.atStart() &&
!tracksToPlay.atEnd()) { // 101
result -= (monitor.currentAddress - // 102
monitor.trackStartAddress);
} // 103
} // 104
return result; // 105
} // 106
// 107
public int togglePause() // 108
throws DriveException
{ // 109
if (status() == Drive.STATUS_PAUSED) { // 110
resume(); // 111
return Drive.STATUS_PLAY; // 112
} // 113
pause(); // 114
return Drive.STATUS_PAUSED; // 115
} // 116
// 117
public synchronized void update(Observable o,
Object arg)// 118
{ // 119
try { // 120
if (monitor.status != Drive.STATUS_INVALID) {
if (monitor.cdChanged) // 122
tracksToPlay.clear(); // 123
else if (monitor.status ==
Drive.STATUS_PLAY) { // 124
int track= monitor.currentTrack; // 125
int tend= monitor.trackEndAddress[track];
if (monitor.currentAddress >=
tend - 210) { // Near end of track?
// Poll frequently so we don't miss the
// event. // 128
while (currentAddress() < tend &&// 129
monitor.status == Drive.STATUS_PLAY
&& currentAddress() != 0) { // 131
try { Thread.sleep(100); // 100 msec
} // 133
catch (InterruptedException e) {
} // 135
} // 136
if (!tracksToPlay.atStart()) // 137
programEndOfTrack(); // 138
else // Normal play // 139
normalEndOfTrack(track); // 140
} // 141
} // 142
} // 143
} // 144
catch (DriveException e) { // 145
System.out.println("Exception: " + e); // 146
} // 147
} // 148
// 149
protected void programEndOfTrack() // 150
{ // 151
try { // 152
int next = tracksToPlay.nextTrack(); // 153
if (tracksToPlay.atEnd()) { // 154
stop(); tracksToPlay.reset();
}
else if (singleMode) stop(); // 155
else play(next); // 156
} // 157
catch (DriveException e) { // 158
System.out.println( // 159
"Program end of track exception: " + e);
} // 160
} // 161
// 162
protected void normalEndOfTrack(int track) // 163
{ // If during the track we switched play // 164
// modes, ensure the correct behaviour occurs.
try { // 165
if (singleMode) stop(); // 166
else if (track < monitor.numberOfTracks)
play(track + 1); // 167
} // 168
catch (DriveException e) { // 169
System.out.println(
"Normal-Play end of track exception: " + e);
} // 171
} // 172
} // 173
// 174
class TrackList extends Vector { // 175
// Gone past last track. // 176
protected boolean at_end = false;
protected Integer current = null; // 177
// 178
TrackList(int initial_n) { // 179
super(initial_n);
}
public synchronized void addTrack(int t) { // 181
addElement(new Integer(t));
}
// 182
public synchronized void removeTrack(int t)// 183
{ // 184
for (int pos = size() - 1; pos >= 0; pos--) {
Integer elem = (Integer) (elementAt(pos));
if (elem.intValue() == t) { // Found // 187
removeElement(elem); // 188
if (elem==current) // Select a new current
current = (Integer) ((pos>=size()) ?
lastElement() : elementAt(pos)); // 190
} // 191
} // 192
} // 193
// 194
public synchronized int stepNumber() // 195
{ // Program step number // 196
return (current != null) ?
indexOf((Object) current) : 0 ; // 197
} // 198
// 199
public synchronized int currentTrack() // 200
{ // 201
return
(current != null) ? current.intValue() : 0 ;
} // 203
// 204
public synchronized int nextTrack() // 205
{ // Advance along the list by one. // 206
if (size() == 0) return 0; // 207
if (current == null) // 208
current = (Integer) firstElement(); // 209
else { // 210
int pos= indexOf((Object) current) + 1;// 211
at_end= pos == size(); //Finished last track?
current = (Integer) (at_end ?
lastElement() : elementAt(pos)); // 213
} // 214
return current.intValue(); // 215
} // 216
// 217
public synchronized int prevTrack() // 218
{ // 219
if (current != null) { // 220
int pos= indexOf((Object) current) - 1;// 221
current = (Integer) ((pos<0) ?
firstElement() : elementAt(pos)); // 222
return current.intValue(); // 223
} // 224
return 0; // 225
} // 226
// 227
public boolean atStart() // 228
{ return current == null ; }
public boolean atEnd() { return at_end; } // 229
// 230
public void skipTo(int track) // 231
{ // 232
if (size() > 0) { // 233
while (!atEnd()) // 234
if (nextTrack() == track && !atEnd())
return;
reset(); // Wrap around to the start // 235
while (!atEnd()) // 236
if (nextTrack() == track)
return;
current = (Integer) lastElement(); // 237
} // 238
} // 239
// 240
public synchronized void clear() // 241
{ reset(); removeAllElements(); }
public synchronized void reset() // 242
{ current = null; at_end = false; }
} // 243
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