Class ExplodedStarTable

java.lang.Object
uk.ac.starlink.table.WrapperStarTable
uk.ac.starlink.table.ExplodedStarTable
All Implemented Interfaces:
Closeable, AutoCloseable, StarTable

public class ExplodedStarTable extends WrapperStarTable
Wrapper table which takes any column whose value is N-element arrays and turns it into N scalar-valued columns.
Since:
2 Mar 2005
Author:
Mark Taylor (Starlink)
  • Constructor Details

    • ExplodedStarTable

      public ExplodedStarTable(StarTable baseTable, boolean[] colFlags)
      Constructs a table in which specified columns are exploded. All of the specified columns must have values which are fixed-length arrays.
      Parameters:
      baseTable - base table
      colFlags - array of flags the same length as the number of columns in baseTable; true elements indicate columns in the base table which should be exploded
      Throws:
      IllegalArgumentException - if any column specified by colFlags has a type which is not a fixed-length array
    • ExplodedStarTable

      public ExplodedStarTable(StarTable baseTable)
      Constructs a table in which all fixed-length array-valued columns are exploded.
      Parameters:
      baseTable - base table
  • Method Details

    • getColumnCount

      public int getColumnCount()
      Description copied from interface: StarTable
      Returns the number of columns in this table.
      Specified by:
      getColumnCount in interface StarTable
      Overrides:
      getColumnCount in class WrapperStarTable
      Returns:
      the number of columns
    • getColumnInfo

      public ColumnInfo getColumnInfo(int icol)
      Description copied from interface: StarTable
      Returns the object describing the data in a given column.
      Specified by:
      getColumnInfo in interface StarTable
      Overrides:
      getColumnInfo in class WrapperStarTable
      Parameters:
      icol - the column for which header information is required
      Returns:
      a ValueInfo object for column icol
    • getCell

      public Object getCell(long irow, int icol) throws IOException
      Description copied from interface: StarTable
      Returns the contents of a given table cell. The class of the returned object should be the same as, or a subclass of, the class returned by getColumnInfo(icol).getContentClass().

      This method is safe for concurrent use from multiple threads, but in general it is recommended to use a RowAccess instead.

      Specified by:
      getCell in interface StarTable
      Overrides:
      getCell in class WrapperStarTable
      Parameters:
      irow - the index of the cell's row
      icol - the index of the cell's column
      Returns:
      the contents of this cell
      Throws:
      IOException - if there is an error reading the data
    • getRow

      public Object[] getRow(long irow) throws IOException
      Description copied from interface: StarTable
      Returns the contents of a given table row. The returned value is equivalent to an array formed of all the objects returned by getCell(irow,icol) for all the columns icol in sequence.

      This method is safe for concurrent use from multiple threads, but in general it is recommended to use a RowAccess instead.

      Specified by:
      getRow in interface StarTable
      Overrides:
      getRow in class WrapperStarTable
      Parameters:
      irow - the index of the row to retrieve
      Returns:
      an array of the objects in each cell in row irow
      Throws:
      IOException - if there is an error reading the data
    • getRowSequence

      public RowSequence getRowSequence() throws IOException
      Description copied from interface: StarTable
      Returns an object which can iterate over all the rows in the table sequentially. Each such returned object is safe for use within a single thread, but not in general from multiple threads concurrently.
      Specified by:
      getRowSequence in interface StarTable
      Overrides:
      getRowSequence in class WrapperStarTable
      Returns:
      new RowSequence
      Throws:
      IOException - if there is an error providing access
    • getRowAccess

      public RowAccess getRowAccess() throws IOException
      Description copied from interface: StarTable
      Returns an object which can provide random access to this table's data, if random access is implemented. Each such returned object is safe for use within a single thread, but not in general from multiple threads concurrently.
      Specified by:
      getRowAccess in interface StarTable
      Overrides:
      getRowAccess in class WrapperStarTable
      Returns:
      new RowAccess
      Throws:
      IOException - if there is an error setting up access
    • getRowSplittable

      public RowSplittable getRowSplittable() throws IOException
      Description copied from interface: StarTable
      Returns an object which can iterate over all the rows in the table, but which may also be requested to split recursively for potentially parallel processing.

      The return value must be non-null, and may provide splitting arrangements specially appropriate for the implementation. If this table 'wraps' an upstream table, it is usually best to base the implementation on calls to the the upstream getRowSplittable method, so that upstream policy about how to divide up the table is respected. However, implementations without special requirements may return Tables.getDefaultRowSplittable(this).

      Specified by:
      getRowSplittable in interface StarTable
      Overrides:
      getRowSplittable in class WrapperStarTable
      Returns:
      new RowSplittable
      Throws:
      IOException
      See Also: