Package uk.ac.starlink.table

Class ExplodedStarTable

  • All Implemented Interfaces:
    java.io.Closeable, java.lang.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 Detail

      • 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:
        java.lang.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 Detail

      • 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 java.lang.Object getCell​(long irow,
                                int icol)
                         throws java.io.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:
        java.io.IOException - if there is an error reading the data

      • getRow

        public java.lang.Object[] getRow​(long irow)
                          throws java.io.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:
        java.io.IOException - if there is an error reading the data

      • getRowSequence

        public RowSequence getRowSequence()
                           throws java.io.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:
        java.io.IOException - if there is an error providing access

      • getRowAccess

        public RowAccess getRowAccess()
                       throws java.io.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:
        java.io.IOException - if there is an error setting up access

      • getRowSplittable

        public RowSplittable getRowSplittable()
                               throws java.io.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:
        java.io.IOException
        See Also:
        RowRunner