Class ListRowStore

  • All Implemented Interfaces:
    RowStore, TableSink

    public class ListRowStore
    extends java.lang.Object
    implements RowStore
    Implementation of RowStore which stores data in memory. The current implementation uses a RowListStarTable. This is better-behaved than the RowStore contract requires; it is guaranteed to be able to store any StarTable object (acceptMetadata(uk.ac.starlink.table.StarTable) will not throw a TableFormatException). Cautious users of this class will note the fact that for large tables, acceptRow(java.lang.Object[]) may throw an OutOfMemoryError.
    Since:
    3 Aug 2004
    Author:
    Mark Taylor (Starlink)
    • Constructor Summary

      Constructors 
      Constructor Description
      ListRowStore()  
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void acceptMetadata​(StarTable meta)
      Takes delivery of a row-less StarTable object which defines the metadata of the table to be transmitted.
      void acceptRow​(java.lang.Object[] row)
      Accepts a row.
      void endRows()
      Signals that there are no more rows to be transmitted.
      StarTable getStarTable()
      Obtains a StarTable which contains the data and metadata that have been written into this sink.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • ListRowStore

        public ListRowStore()
    • Method Detail

      • acceptMetadata

        public void acceptMetadata​(StarTable meta)
        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
      • acceptRow

        public void acceptRow​(java.lang.Object[] row)
                       throws java.io.IOException
        Accepts a row.
        Specified by:
        acceptRow in interface TableSink
        Parameters:
        row - table data row
        Throws:
        java.lang.OutOfMemoryError - if it's run out of memory
        java.io.IOException
      • endRows

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