Class ByteStoreRowStore

java.lang.Object
uk.ac.starlink.table.storage.ByteStoreRowStore
All Implemented Interfaces:
RowStore, TableSink
Direct Known Subclasses:
DiskRowStore

public class ByteStoreRowStore extends Object implements RowStore
RowStore based on a ByteStore. It uses custom serialization to encode some basic data types (primitives, Strings, and arrays of them) as a byte sequence. Therefore it may not cope with tables containing exotic objects. The actual storage destination is controlled by the ByteStore implementation used.
Since:
5 Nov 2009
Author:
Mark Taylor
  • Constructor Details

    • ByteStoreRowStore

      public ByteStoreRowStore(ByteStore byteStore)
      Constructor.
      Parameters:
      byteStore - storage container used by this row store
  • Method Details

    • getByteStore

      public ByteStore getByteStore()
      Returns the underlying storage for this row store.
      Returns:
      buffer holding byte data
    • acceptMetadata

      public void acceptMetadata(StarTable meta) throws TableFormatException
      Description copied from interface: TableSink
      Takes delivery of a row-less StarTable object which defines the metadata of the table to be transmitted. If the number of rows that will be transmitted via subsequent calls to acceptRow is known, this value should be made available as the row count of meta (StarTable.getRowCount()); if it is not known, the row count should be -1. However, this object should not attempt to read any of meta's cell data.

      The data to be transmitted in subsequent calls of acceptRow must match the metadata transmitted in this call in the same way that rows of a StarTable must match its own metadata (number and content clases of columns etc). If this sink cannot dispose of a table corresponding to meta then it may throw a TableFormatException - this may be the case if for instance meta has columns with types that this sink can't deal with.

      Specified by:
      acceptMetadata in interface TableSink
      Parameters:
      meta - table metadata object
      Throws:
      TableFormatException - if this sink cannot accept table rows matching the given metadata
    • acceptRow

      public void acceptRow(Object[] row) throws IOException
      Description copied from interface: TableSink
      Takes delivery of one row of data. row is an array of objects comprising the contents of one row of the table being transmitted. The number and classes of the elements of row are described by the metadata object previously accepted.
      Specified by:
      acceptRow in interface TableSink
      Parameters:
      row - table data row
      Throws:
      IOException
    • endRows

      public void endRows() throws IOException
      Description copied from interface: TableSink
      Signals that there are no more rows to be transmitted.
      Specified by:
      endRows in interface TableSink
      Throws:
      IOException
    • getStarTable

      public StarTable getStarTable()
      Description copied from interface: RowStore
      Obtains a StarTable which contains the data and metadata that have been written into this sink. In general it is only legal to call this method following a call to TableSink.endRows(); failing to observe this sequence may earn you an IllegalStateException
      Specified by:
      getStarTable in interface RowStore
      Returns:
      a random-access StarTable containing the written rows