Examples of org.apache.derby.iapi.services.io.ArrayInputStream

Package org.apache.derby.iapi.services.io

Examples of org.apache.derby.iapi.services.io.ArrayInputStream

org.apache.derby.iapi.services.io.ArrayInputStream
An InputStream that allows reading from an array of bytes. The array of bytes that is read from can be changed without having to create a new instance of this class.

  {
    super.initialize();


    if (rawDataIn == null) 
        {
      rawDataIn            = new ArrayInputStream();
      checksum             = new CRC32();
    }


    if (pageData != null)
      rawDataIn.setData(pageData);

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                    "restoreRecordFromSlot called on an overflow page.");
      }


            // position the array reading stream at beginning of row data just
            // past the record header.
      ArrayInputStream lrdi = rawDataIn;
      lrdi.setPosition(offset_to_row_data);


      if (!recordHeader.hasOverflow())
            {
                if (isHeadRow)
                {
                    if (fetchDesc != null && 
                        fetchDesc.getQualifierList() != null)
                    {
                        fetchDesc.reset();


                        if (!qualifyRecordFromSlot(
                                row, 
                                offset_to_row_data, 
                                fetchDesc,
                                recordHeader,
                                recordToLock))
                        {
                            return(false);
                        }
                        else
                        {
                            // reset position back for subsequent record read.
                            lrdi.setPosition(offset_to_row_data);
                        }
                    }
                }


                // call routine to do the real work.  Note that

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                }
            }


            // position the array reading stream at beginning of row data 
            // just past the record header.
            ArrayInputStream lrdi = rawDataIn;
            lrdi.setPosition(offset_to_row_data);


            if (fetchDesc != null)
            {
                if (fetchDesc.getQualifierList() != null)
                {

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     **/
  private void readPageHeader() 
        throws IOException
  {
    // these reads are always against the page array
    ArrayInputStream lrdi = rawDataIn;


    lrdi.setPosition(PAGE_HEADER_OFFSET);
    long spare;


    isOverflowPage  =  lrdi.readBoolean();
    setPageStatus    (lrdi.readByte());
    setPageVersion    (lrdi.readLong());
    slotsInUse      =  lrdi.readUnsignedShort();
    nextId          =  lrdi.readInt();
    generation      =  lrdi.readInt();     // page generation (Future Use)
    prevGeneration  =  lrdi.readInt();     // previous generation (Future Use)
    bipLocation     =  lrdi.readLong();  // BIPage location (Future Use)


    // number of deleted rows on page, we start to store this release 2.0.
    // for upgrade reasons, a 0 on disk means -1, so, we subtract one here.
    deletedRowCount =  lrdi.readUnsignedShort() - 1;


        // the next 4 (total 22 bytes) are reserved for future
    spare           =   lrdi.readUnsignedShort();  
    spare           =   lrdi.readInt();     // used by encryption
    spare           =   lrdi.readLong();
    spare           =   lrdi.readLong();
  }

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                }
            }


            // position the array reading stream at beginning of row data 
            // just past the record header.
            ArrayInputStream lrdi = rawDataIn;
            lrdi.setPosition(offset_to_row_data);


            if (fetchDesc != null)
            {
                if (fetchDesc.getQualifierList() != null)
                {

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     **/
  private void readPageHeader() 
        throws IOException
  {
    // these reads are always against the page array
    ArrayInputStream lrdi = rawDataIn;


    lrdi.setPosition(PAGE_HEADER_OFFSET);
    long spare;


    isOverflowPage  =  lrdi.readBoolean();
    setPageStatus    (lrdi.readByte());
    setPageVersion    (lrdi.readLong());
    slotsInUse      =  lrdi.readUnsignedShort();
    nextId          =  lrdi.readInt();
    generation      =  lrdi.readInt();     // page generation (Future Use)
    prevGeneration  =  lrdi.readInt();     // previous generation (Future Use)
    bipLocation     =  lrdi.readLong();  // BIPage location (Future Use)


    // number of deleted rows on page, we start to store this release 2.0.
    // for upgrade reasons, a 0 on disk means -1, so, we subtract one here.
    deletedRowCount =  lrdi.readUnsignedShort() - 1;


        // the next 4 (total 22 bytes) are reserved for future
    spare           =   lrdi.readUnsignedShort();  
    spare           =   lrdi.readInt();     // used by encryption
    spare           =   lrdi.readLong();
    spare           =   lrdi.readLong();
  }

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        {
      SanityManager.ASSERT(getRecordOffset(slot) != 0);
    }


    // these reads are always against the page array
    ArrayInputStream lrdi = rawDataIn;


    lrdi.setPosition(
            slotTableOffsetToFirstRecordLengthField - (slot * slotEntrySize));


        return( 
            (slotFieldSize == SMALL_SLOT_SIZE) ?
                lrdi.readUnsignedShort() : lrdi.readInt());
  }

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        {
      SanityManager.ASSERT(getRecordOffset(slot) != 0);
    }


    // these reads are always against the page array
    ArrayInputStream lrdi = rawDataIn;


    lrdi.setPosition(
            slotTableOffsetToFirstReservedSpaceField - (slot * slotEntrySize));


        return( 
            (slotFieldSize == SMALL_SLOT_SIZE) ?
                lrdi.readUnsignedShort() : lrdi.readInt());
  }

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      }


      int numberFields = recordHeader.getNumberFields();


      // these reads are always against the page array
      ArrayInputStream lrdi = rawDataIn;


            // position after the record header, at 1st column.
      lrdi.setPosition(offset + recordHeader.size());
    
      for (int i = 0; i < numberFields; i++) 
            {
        int fieldStatus = StoredFieldHeader.readStatus(lrdi);
        if (StoredFieldHeader.isOverflow(fieldStatus))
          return false;


        int fieldLength = 
                    StoredFieldHeader.readFieldDataLength(
                        lrdi, fieldStatus, slotFieldSize);


        if (fieldLength != 0)
          lrdi.setPosition(lrdi.getPosition() + fieldLength);
      }
    } 
        catch (IOException ioe) 
        {
      throw dataFactory.markCorrupt(

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      StoredRecordHeader recordHeader = getHeaderAtSlot(slot); 


      int numberFields    = recordHeader.getNumberFields();


      // these reads are always against the page array
      ArrayInputStream lrdi = rawDataIn;


            // position the stream to just after record header.
      int offset          = getRecordOffset(slot) + recordHeader.size();
      lrdi.setPosition(offset);


      for (int i = 0; i < numberFields; i++) 
            {
        int fieldStatus = StoredFieldHeader.readStatus(lrdi);
        int fieldLength = 
                    StoredFieldHeader.readFieldDataLength(
                        lrdi, fieldStatus, slotFieldSize);


        if (!StoredFieldHeader.isOverflow(fieldStatus)) 
                {
          // skip this field, it is not an long column
          if (fieldLength != 0)
                        lrdi.setPosition(lrdi.getPosition() + fieldLength);
          continue;
        }
                else
                {

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