Package uk.ac.starlink.table.join

Class Match1Type

  • public abstract class Match1Type
extends java.lang.Object
    Defines how an output table is created from the results of an internal (single-table) match operation. This class contains several factory methods for generating sensible output tables from an internal match. Others are possible.
    Since:
    15 Nov 2007
    Author:
    Mark Taylor

    • Constructor Summary

      Constructors 
      Constructor Description
      Match1Type()  

    • Method Summary

      All Methods Static Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      static Match1Type createEliminateMatchesType​(int retainCount)
      Factory method returning a type object which eliminates rows forming part of the same match group.
      static Match1Type createIdentifyType()
      Factory method returning a type object which identifies matched rows by adding some additional columns to the input.
      abstract StarTable createMatchTable​(StarTable inTable, LinkSet rowLinks)
      Generates an output table given an input table and the LinkSet object which defines how its rows are related to each other by matching.
      static Match1Type createWideType​(int grpSize)
      Factory method returning a type object which aligns match groups with each other in the rows of a new wide table.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • Match1Type

        public Match1Type()

    • Method Detail

      • createMatchTable

        public abstract StarTable createMatchTable​(StarTable inTable,
                                           LinkSet rowLinks)
        Generates an output table given an input table and the LinkSet object which defines how its rows are related to each other by matching.
        Parameters:
        inTable - input table
        rowLinks - link set object giving the result of a single-table match

      • createIdentifyType

        public static Match1Type createIdentifyType()
        Factory method returning a type object which identifies matched rows by adding some additional columns to the input. These flag which rows match which other ones and give a group size count.
        Returns:
        new identification type

      • createEliminateMatchesType

        public static Match1Type createEliminateMatchesType​(int retainCount)
        Factory method returning a type object which eliminates rows forming part of the same match group. All rows from a match group starting at index retainCount are removed from the output table. Thus retainCount=0 removes any rows which participate in matches with other ones, and retainCount=1 leaves just one from any such group.
        Parameters:
        retainCount - number of items to retain from each match group

      • createWideType

        public static Match1Type createWideType​(int grpSize)
        Factory method returning a type object which aligns match groups with each other in the rows of a new wide table. The output table has columns like grpSize versions of the input table side by side, and where there are exactly grpSize matches in a group they form a row. Rows which are not part of a grpSize-element match do not appear in the output.
        Parameters:
        grpSize - size of group we are interested in