Package uk.ac.starlink.ttools.example

Class GeojsonTableBuilder

  • All Implemented Interfaces:
    uk.ac.starlink.table.TableBuilder
    public class GeojsonTableBuilder
extends java.lang.Object
implements uk.ac.starlink.table.TableBuilder
    Experimental GeoJSON table input handler. It was written with reference to RFC7946 and a countries.geojson file I found, but it's pretty scrappy. It looks for a type="FeatureCollection" entry in the top-level object, and then pulls Features out of that, currently taking account of only Polygon and MultiPolygon types. Winding directions and exclusions are currently ignored. Polygons are turned into STC-S POLYGON or UNION of POLYGON entries, and the other metadata items are stored in their own columns. The whole GeoJSON input file is slurped into memory, even in streaming mode.
    Since:
    3 Jun 2020
    Author:
    Mark Taylor

    • Constructor Summary

      Constructors 
      Constructor Description
      GeojsonTableBuilder()
      Default constructor.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean canImport​(java.awt.datatransfer.DataFlavor flavor)  
      java.lang.String getFormatName()  
      java.lang.String getShapeColName()
      Returns the name of the feature shape column.
      boolean looksLikeFile​(java.lang.String location)  
      uk.ac.starlink.table.StarTable makeStarTable​(uk.ac.starlink.util.DataSource datsrc, boolean wantRandom, uk.ac.starlink.table.StoragePolicy storage)  
      void setShapeColName​(java.lang.String shapeColName)
      Sets the name for the feature shape column.
      void streamStarTable​(java.io.InputStream in, uk.ac.starlink.table.TableSink sink, java.lang.String pos)  

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • GeojsonTableBuilder

        public GeojsonTableBuilder()
        Default constructor.

    • Method Detail

      • canImport

        public boolean canImport​(java.awt.datatransfer.DataFlavor flavor)
        Specified by:
        canImport in interface uk.ac.starlink.table.TableBuilder

      • getFormatName

        public java.lang.String getFormatName()
        Specified by:
        getFormatName in interface uk.ac.starlink.table.TableBuilder

      • looksLikeFile

        public boolean looksLikeFile​(java.lang.String location)
        Specified by:
        looksLikeFile in interface uk.ac.starlink.table.TableBuilder

      • makeStarTable

        public uk.ac.starlink.table.StarTable makeStarTable​(uk.ac.starlink.util.DataSource datsrc,
                                                    boolean wantRandom,
                                                    uk.ac.starlink.table.StoragePolicy storage)
                                             throws java.io.IOException
        Specified by:
        makeStarTable in interface uk.ac.starlink.table.TableBuilder
        Throws:
        java.io.IOException

      • streamStarTable

        public void streamStarTable​(java.io.InputStream in,
                            uk.ac.starlink.table.TableSink sink,
                            java.lang.String pos)
                     throws java.io.IOException
        Specified by:
        streamStarTable in interface uk.ac.starlink.table.TableBuilder
        Throws:
        java.io.IOException

      • setShapeColName

        public void setShapeColName​(java.lang.String shapeColName)
        Sets the name for the feature shape column.
        Parameters:
        shapeColName - name for STC-S feature shape column

      • getShapeColName

        public java.lang.String getShapeColName()
        Returns the name of the feature shape column.
        Returns:
        name for STC-S feature shape column