Class ShapefileWriter

java.lang.Object
com.vividsolutions.jump.io.ShapefileWriter
All Implemented Interfaces:
JUMPWriter
public class ShapefileWriter extends Object implements JUMPWriter
ShapefileWriter is a JUMPWriter specialized to write Shapefiles.

DataProperties for the ShapefileWriter write(DataProperties) interface:

Parameter Meaning
OutputFile or DefaultValue File name for the output .shp file
ShapeType Dimensionality of the Shapefile - 'xy', 'xym' or 'xyz'. 'xymz' and 'xyzm' are the same as 'xyz'

NOTE: The input .dbf and .shx is assumed to be 'beside' (in the same directory) as the .shp file.

The shapefile writer consists of two parts: writing attributes (.dbf) and writing geometries (.shp).

JUMP columns are converted to DBF columns by:

JUMP Column DBF column
STRING Type 'C' length is size of longest string in the FeatureCollection
DOUBLE Type 'N' length is 33, with 16 digits right of the decimal
INTEGER Type 'N' length is 16, with 0 digits right of the decimal

For more information on the DBF file format, see the DBF Specification FAQ

Since shape files may contain only one type of geometry (POINT, MULTPOINT, POLYLINE, POLYGON, POINTM, MULTPOINTM, POLYLINEM, POLYGONM, POINTZ, MULTPOINTZ, POLYLINEZ, or POLYGONZ), the FeatureCollection must be first be normalized to one type:

First non-NULL non-Point geometry in FeatureCollection Coordinate Dimensionality Shape Type
MULTIPOINT xy xym xyzm MULTIPOINT MULTIPOINTM MULTIPOINTZ
LINESTRING/MULTILINESTRING xy xym xyzm POLYLINE POLYLINEM POLYLINEZ
POLYGON/MULTIPOLYGON xy xym xyzm POLYGON POLYGONM POLYGONZ
All geometries in FeatureCollection are Coordinate Dimensionality Shape Type
POINT xy xym xyzm POINT POINTM POINTZ

During this normalization process any non-consistent geometry will be replaced by a NULL geometry.

For example, if the shapetype is determined to be 'POLYLINE' any POINT, MULTIPOINT, or POLYGON geometries in the FeatureCollection will be replaced with a NULL geometry.

The coordinate dimensionality can be explicitly set with a DataProperties tag of 'ShapeType': 'xy', 'xym', or 'xyz' ('xymz' and 'xyzm' are pseudonyms for 'xyz'). If this DataProperties is unspecified, it will be auto set to 'xy' or 'xyz' based on the first non-NULL geometry having a Z coordinate.

Since JUMP and JTS do not currently support a M (measure) coordinate, it will always be set to -10E40 in the shape file (type 'xym' or 'xyzm'). This value represents the Measure "no data" value (page 2, ESRI Shapefile Technical Description). Since the 'NaN' DOUBLE values for Z coordinates is invalid in a shapefile, it is converted to '0.0'.

For more information on the shapefile format, see the ESRI Shapefile Spec

For more information on the DBF, see and

  • Constructor Details

    • ShapefileWriter

      public ShapefileWriter()
      Creates new ShapefileWriter

  • Method Details

    • write

      public void write(FeatureCollection featureCollection, DriverProperties dp) throws Exception
      Main method - write the featurecollection to a shapefile (2d, 3d or 4d).
      Specified by:
      write in interface JUMPWriter
      Parameters:
      featureCollection - collection to write
      dp - 'OutputFile' or 'DefaultValue' to specify where to write, and 'ShapeType' to specify dimensionality.
      Throws:
      Exception

    • getPrjString

      protected String getPrjString(String code) throws Exception
      Throws:
      Exception