songdbj/RuntimeDatabase.java

   1 import java.util.*;
   2 import java.io.*;
   3 import java.lang.reflect.Array;
   4
   5 /*
   6         TreeSet for runtimedatabase with entry hash used in compareto
   7         fix commandline interface.
   8 */
   9
  10 public class RuntimeDatabase {
  11         protected static RuntimeDatabase instance=null;
  12         protected TreeMap entries;
  13         protected int entrycount;
  14         public static final int headersize = 8;
  15
  16         protected RuntimeDatabase() {
  17                 entries=new TreeMap();
  18         }
  19
  20         public static RuntimeDatabase getInstance() {
  21                 if(instance==null)
  22                         instance=new RuntimeDatabase();
  23                 return instance;
  24         }
  25
  26   public RundbEntry getEntry(FileEntry file) {
  27         Integer key = new Integer(file.getHash());
  28                 if(!entries.containsKey(key)) {
  29                         RundbEntry e = new RundbEntry(file);
  30                   entries.put(key,e);
  31                   return e;
  32                 }
  33                 else
  34                   return (RundbEntry)entries.get(key);
  35         }
  36
  37         protected void calcOffsets() {
  38           Collection values = entries.values();
  39                 Iterator i;
  40                 int offset=headersize;
  41                 i=values.iterator();
  42                 while(i.hasNext()) {
  43                         Entry e = (Entry) i.next();
  44                         e.setOffset(offset);
  45                         offset+=RundbEntry.entrySize();
  46                 }
  47                 entrycount=values.size();
  48         }
  49
  50         public int isDirty() {
  51                 return 0;
  52         }
  53
  54         protected void writeHeader(DataOutputStream w) throws IOException {
  55                 w.write('R');
  56                 w.write('R');
  57                 w.write('D');
  58                 w.write(0x1);
  59                 w.writeInt(entrycount);
  60         }
  61
  62         public void prepareWrite() {
  63                 System.out.println("Calculating Runtime Database Offsets..");
  64                 calcOffsets();
  65         }
  66
  67         public void writeDatabase(File f) throws IOException {
  68                 int x;
  69                 Iterator i;
  70                 DataOutputStream w = new DataOutputStream(new FileOutputStream(f));
  71                 System.out.println("Writing runtime database..");
  72                 writeHeader(w);
  73                 i=entries.values().iterator();
  74                 while(i.hasNext()) {
  75                         Entry e = (Entry) i.next();
  76                         e.write(w);
  77                 }
  78                 w.flush();
  79                 w.close();
  80         }
  81 }