DAAPLib/src/util/command/Update.java

   1 package util.command;
   2
   3 import interfaces.DJInterface;
   4
   5 import java.util.Map;
   6
   7 import notification.LibraryListener;
   8 import util.node.Node;
   9 import dacp.DACPTreeBuilder;
  10
  11 public class Update implements Command, LibraryListener {
  12
  13         private int revision;
  14
  15         public void init(Map<String, String> args) {
  16                 String rev = args.get("revision-number");
  17                 if (rev == null) {
  18                         revision = 0;
  19                         System.err.println("update: revision number not present");
  20                 }
  21                 else {
  22                         try {
  23                                 revision = Integer.parseInt(rev);
  24                         }
  25                         catch (NumberFormatException ex) {
  26                                 throw new IllegalArgumentException("revision number " + rev + " is not valid");
  27                         }
  28                 }
  29         }
  30
  31         public Node run(DJInterface dj) {
  32
  33                 if (this.revision >= dj.library().version()) {
  34
  35                         dj.library().registerLibraryListener(this);
  36
  37                         try {
  38                                 synchronized (this) {
  39                                         this.wait(10000); //wait 10 seconds if nothing has changed
  40                                 }
  41                         } catch (InterruptedException e) {
  42                                 e.printStackTrace();
  43                         }
  44
  45                         dj.library().removeLibraryListener(this);
  46                 }
  47
  48                 //TODO use version to check whether update is needed
  49                 return DACPTreeBuilder.buildUpdateResponse(dj.library().version());
  50         }
  51
  52         public void libraryVersionChanged(int version) {
  53                 synchronized (this) {
  54                         this.notify();
  55                 }
  56         }
  57
  58
  59 }