Package uk.ac.starlink.ttools.plottask

Class TablePlotData

java.lang.Object
uk.ac.starlink.ttools.plottask.TablePlotData
All Implemented Interfaces:
PlotData
Direct Known Subclasses:
CartesianTablePlotData
public abstract class TablePlotData extends Object implements PlotData
Abstract superclass for PlotData implementation representing the data from a single table with associated expressions describing coordinate selections etc. Concrete subclasses must see to provision of coordinate and error data.
Since:
22 Apr 2008
Author:
Mark Taylor

  • Constructor Details

    • TablePlotData

      protected TablePlotData(uk.ac.starlink.table.StarTable table, String[] setExprs, String[] setNames, Style[] setStyles, String labelExpr)
      Constructor.
      Parameters:
      table - table this data is based on
      setExprs - nset-element array of JEL boolean expressions for subset inclusion criteria
      setNames - nset-element array of subset names
      setStyles - nset-element array of subset plot styles
      labelExpr - JEL String expression for text label

  • Method Details

    • createPointSequence

      protected abstract PointSequence createPointSequence(SequentialJELRowReader rseq) throws gnu.jel.CompilationException
      Constructs a point sequence suitable for dispensing by this plot data.
      Parameters:
      rseq - row reader representing this data's table
      Returns:
      new point sequence for plotting
      Throws:
      gnu.jel.CompilationException

    • getSetCount

      public int getSetCount()
      Description copied from interface: PlotData
      Returns the number of subsets in this object.
      Specified by:
      getSetCount in interface PlotData
      Returns:
      subset count

    • getSetName

      public String getSetName(int iset)
      Description copied from interface: PlotData
      Returns the name for a given subset.
      Specified by:
      getSetName in interface PlotData
      Parameters:
      iset - subset index
      Returns:
      subset name

    • getSetStyle

      public Style getSetStyle(int iset)
      Description copied from interface: PlotData
      Returns the plotting style for a given subset.
      Specified by:
      getSetStyle in interface PlotData
      Parameters:
      iset - subset index
      Returns:
      subset style

    • hasLabels

      public boolean hasLabels()
      Description copied from interface: PlotData
      Indicates whether there are or may be text labels associated with the data points in this object.
      Specified by:
      hasLabels in interface PlotData
      Returns:
      true if PointSequence.getLabel() may have non-null returns

    • getPointSequence

      public PointSequence getPointSequence()
      Description copied from interface: PlotData
      Returns an iterator over the data points in this object.
      Specified by:
      getPointSequence in interface PlotData
      Returns:
      new point iterator

    • checkExpressions

      public void checkExpressions() throws gnu.jel.CompilationException
      Checks that any JEL expressions used by the data for this object compile correctly. A dummy call of createPointSequence(uk.ac.starlink.ttools.jel.SequentialJELRowReader) is made.
      Throws:
      gnu.jel.CompilationException - if one is thrown by createPointSequence