Examples of javax.microedition.rms.RecordEnumeration

javax.microedition.rms.RecordEnumeration
An interface representing a bidirectional record store Record enumerator. The RecordEnumeration logically maintains a sequence of the recordId's of the records in a record store. The enumerator will iterate over all (or a subset, if an optional record filter has been supplied) of the records in an order determined by an optional record comparator.
By using an optional RecordFilter, a subset of the records can be chosen that match the supplied filter. This can be used for providing search capabilities.

By using an optional RecordComparator, the enumerator can index through the records in an order determined by the comparator. This can be used for providing sorting capabilities.

If, while indexing through the enumeration, some records are deleted from the record store, the recordId's returned by the enumeration may no longer represent valid records. To avoid this problem, the RecordEnumeration can optionally become a listener of the RecordStore and react to record additions and deletions by recreating its internal index. Use special care when using this option however, in that every record addition, change and deletion will cause the index to be rebuilt, which may have serious performance impacts.

If the RecordStore used by this RecordEnumeration is closed, this RecordEnumeration becomes invalid and all subsequent operations performed on it may give invalid results or throw a RecordStoreNotOpenException, even if the same RecordStore is later opened again. In addition, calls to hasNextElement() and hasPreviousElement() will return false.

The first call to nextRecord() returns the record data from the first record in the sequence. Subsequent calls to nextRecord() return the next consecutive record's data. To return the record data from the previous consecutive from any given point in the enumeration, call previousRecord(). On the other hand, if after creation, the first call is to previousRecord(), the record data of the last element of the enumeration will be returned. Each subsequent call to previousRecord() will step backwards through the sequence until the beginning is reached.

Final note, to do record store searches, create a RecordEnumeration with no RecordComparator, and an appropriate RecordFilter with the desired search criterion.
@since MIDP 1.0

   * @see net.sf.microlog.core.appender.AbstractAppender#clear()
   */
  public synchronized void clear() {


    try {
      RecordEnumeration enumeration = logRecordStore.enumerateRecords(
          null, null, false);
      while (enumeration.hasNextElement()) {
        int recordId = enumeration.nextRecordId();
        logRecordStore.deleteRecord(recordId);
      }
    } catch (RecordStoreNotOpenException e) {
      System.err.println("RecordStore not open " + e);
    } catch (InvalidRecordIDException e) {

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      // runtime
      if (!logOpen) {
        logRecordStore = RecordStore.openRecordStore(recordStoreName,
            true);
      }
      RecordEnumeration recordEnum = logRecordStore.enumerateRecords(
          null, new DescendingComparator(), false);


      while (recordEnum.hasNextElement()) {
        int recId = recordEnum.nextRecordId();
        if (arrayPointer >= 0) {
          // save recId
          limitedRecordIDs[arrayPointer] = recId;
          arrayPointer--;
        } else {
          // too old, just delete
          logRecordStore.deleteRecord(recId);
        }
      }
      recordEnum.destroy();
    } catch (RecordStoreNotFoundException e) {
      System.err.println("Failed to find recordstore. " + e);
    } catch (RecordStoreException e) {
      System.err.println("Something is wrong with the RecordStore. " + e);
    }

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   */
  public void clearLog() {


    try {
      logRecordStore = RecordStore.openRecordStore(recordStoreName, true);
      RecordEnumeration enumeration = logRecordStore.enumerateRecords(
          null, null, false);
      while (enumeration.hasNextElement()) {
        int recordId = enumeration.nextRecordId();
        logRecordStore.deleteRecord(recordId);
      }


      logRecordStore = RecordStore.openRecordStore(recordStoreName, true);

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    }


    static synchronized void load()
    {
        RecordStore rs = null;
        RecordEnumeration re = null;
        //noinspection CheckForOutOfMemoryOnLargeArrayAllocation
        byte[] buffer = new byte[ 256 ];
        try
        {
            rs = RecordStore.openRecordStore( RS_NAME, true );
            cache = new Hashtable( rs.getNumRecords() );
            re = rs.enumerateRecords( null, null, false );
            int recordId;
            int recordSize;
            //noinspection MethodCallInLoopCondition
            while( re.hasNextElement() )
            {
                recordId = re.nextRecordId();
                recordSize = rs.getRecordSize( recordId );
                if( buffer.length < recordSize )
                {
                    buffer = new byte[ recordSize + 64 ];
                }
                rs.getRecord( recordId, buffer, 0 );
                final StoreInfo info = new StoreInfo();
                info.deserialize( new SerializerInputStream(
                        new ByteArrayInputStream( buffer )
                ) );
                info.recordId = new Integer( recordId );
                cache.put( info.name, info );
            }
        }
        catch( RecordStoreException e )
        {
            log.error( e );
            ErrorHandler.handleError( null, e );
        }
        catch( SerializationException e )
        {
            log.error( e );
            ErrorHandler.handleError( null, e );
        }
        finally
        {
            if( re != null ) try{ re.destroy(); }catch( Exception e ){}
            if( rs != null ) try{ rs.closeRecordStore(); }catch( Exception e ){}
        }
    }

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        try
        {
            rs=RecordStore.openRecordStore(RMS_ID,true);
            //buscar y borrar elemto con mismo nombre
            RecordFilter filtro=new RmsFiltro(nombre);
            RecordEnumeration re=rs.enumerateRecords(filtro,null,false);
            while(re.hasNextElement())
            {
                int el=re.nextRecordId();
                result=rs.getRecord(el);
            }
            rs.closeRecordStore();
        }
        catch (Exception e)

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        try
        {
            rs=RecordStore.openRecordStore(RMS_ID,true);
            //buscar y borrar elemto con mismo nombre
            RecordFilter filtro=new RmsFiltro(nombre);
            RecordEnumeration re=rs.enumerateRecords(filtro,null,false);
            while(re.hasNextElement())
            {
                int el=re.nextRecordId();
                rs.deleteRecord(el);
            }
            rs.closeRecordStore();
        }
        catch (Exception e)

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        RecordStore rs=null;
        try
        {
            rs=RecordStore.openRecordStore(RMS_ID,true);
            //buscar y borrar elemto con mismo nombre
            RecordEnumeration re=rs.enumerateRecords(null,null,false);
            result=new String[re.numRecords()];
            for(int i=0;i<result.length;i++)
            {
                String el=new String(re.nextRecord());
                result[i]=getId(el);
            }
            rs.closeRecordStore();
        }
        catch (Exception e)

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        try
        {
            rs=RecordStore.openRecordStore(AlmacenMicropocha.RMS_ID,true);
            //buscar y borrar elemto con mismo nombre
            RecordFilter filtro=new AlmacenMicropocha.RmsFiltro(nombre);
            RecordEnumeration re=rs.enumerateRecords(filtro,null,false);
            while(re.hasNextElement())
            {
                int el=re.nextRecordId();
                rs.deleteRecord(el);
            }
            rs.closeRecordStore();
        }
        catch (Exception e)

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        try
        {
            rs=RecordStore.openRecordStore(AlmacenMicropocha.RMS_ID,true);
            //buscar y borrar elemto con mismo nombre
            RecordFilter filtro=new AlmacenMicropocha.RmsFiltro(nombre);
            RecordEnumeration re=rs.enumerateRecords(filtro,null,false);
            while(re.hasNextElement())
            {
                int el=re.nextRecordId();
                rs.deleteRecord(el);
            }
            rs.closeRecordStore();
        }
        catch (Exception e)

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    return registry;
  }


  public static Vector loadFromRMS(RecordStore rms) throws RecordStoreNotOpenException, InvalidRecordIDException, RecordStoreException, IOException {
    Vector registry = new Vector(rms.getNumRecords());
    RecordEnumeration enumeration = rms.enumerateRecords(null,null,false);
    while(enumeration.hasNextElement()) {
      int id = enumeration.nextRecordId();
      Mucus mucus = new Mucus();
      ByteArrayInputStream bin = new ByteArrayInputStream(rms.getRecord(id));
      DataInputStream in = new DataInputStream(bin);
      mucus.readFrom(in);
      mucus.setId(id);

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