JTS Topology Suite

You can download 1.12 from http://sourceforge.net/projects/jts-topo-suite/files/latest/download?source=files




________________________________
 From: Mark Coletti <mcoletti@...>
To: jts-topo-suite-user@... 
Sent: Friday, November 30, 2012 8:32 PM
Subject: [Jts-topo-suite-user] So, is there an official 1.12 JAR file?
 

The latest version is 1.8 here: http://www.vividsolutions.com/jts/jtshome.htm  Any plans to make 1.12 available?

(Yes, I can make one myself, but I'd rather have a URL I can point users to than having to build my own copy that's not bloated with examples and test suites.)

-- 
mcoletti@...



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> (Yes, I can make one myself, but I'd rather have a URL I can point users to
> than having to build my own copy that's not bloated with examples and test
> suites.)
>

Binary, source and javadoc jars containing the core classes (ie.
excluding examples etc) can also downloaded via maven or manually from
the maven central repository:

http://search.maven.org/#artifactdetails%7Ccom.vividsolutions%7Cjts%7C1.12%7Cjar

Michael

Just compiled JTS 1.12 source under Java 1.4 and I got this breakage in GeometryMapper:

Error(74,19):  for-each loops are not supported in -source 1.4

   public static Collection map(Collection geoms, MapOp op)
   {
     List mapped = new ArrayList();
     for (Object o : geoms) {
       Geometry g = (Geometry) o;
       Geometry gr = op.map(g);
       if (gr != null)
         mapped.add(gr);
     }
     return mapped;
   }

Only one that I can see.

regards
Simon
-- 
Holder of "2011 Oracle Spatial Excellence Award for Education and Research."
SpatialDB Advice and Design, Solutions Architecture and Programming,
Oracle Database 10g Administrator Certified Associate; Oracle Database 10g SQL Certified Professional
Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME, Radius Topology and Studio Specialist.
39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
Website: http://www.spatialdbadvisor.com
   Email: simon@...
   Voice: +61 362 396397
Mobile: +61 418 396391
Skype: sggreener
Longitude: 147.20515 (147° 12' 18" E)
Latitude: -43.01530 (43° 00' 55" S)
GeoHash: r22em9r98wg
NAC:W80CK 7SWP3

Thanks, Simon.  What's your use case for using JTS under Java 1.4?

On Sun, Dec 2, 2012 at 7:20 PM, Simon Greener <simon@...:

> Just compiled JTS 1.12 source under Java 1.4 and I got this breakage in
> GeometryMapper:
>
> Error(74,19):  for-each loops are not supported in -source 1.4
>
>    public static Collection map(Collection geoms, MapOp op)
>    {
>      List mapped = new ArrayList();
>      for (Object o : geoms) {
>        Geometry g = (Geometry) o;
>        Geometry gr = op.map(g);
>        if (gr != null)
>          mapped.add(gr);
>      }
>      return mapped;
>    }
>
> Only one that I can see.
>
> regards
> Simon
> --
> Holder of "2011 Oracle Spatial Excellence Award for Education and
> Research."
> SpatialDB Advice and Design, Solutions Architecture and Programming,
> Oracle Database 10g Administrator Certified Associate; Oracle Database 10g
> SQL Certified Professional
> Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME,
> Radius Topology and Studio Specialist.
> 39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
> Website: http://www.spatialdbadvisor.com
>    Email: simon@...
>    Voice: +61 362 396397
> Mobile: +61 418 396391
> Skype: sggreener
> Longitude: 147.20515 (147° 12' 18" E)
> Latitude: -43.01530 (43° 00' 55" S)
> GeoHash: r22em9r98wg
> NAC:W80CK 7SWP3
>
>
> ------------------------------------------------------------------------------
> Keep yourself connected to Go Parallel:
> BUILD Helping you discover the best ways to construct your parallel
> projects.
> http://goparallel.sourceforge.net
> _______________________________________________
> Jts-topo-suite-user mailing list
> Jts-topo-suite-user@...
> https://lists.sourceforge.net/lists/listinfo/jts-topo-suite-user
>

This was fixed in JTS 1.13, as of August 2011.

On Sun, Dec 2, 2012 at 7:20 PM, Simon Greener <simon@...:

> Just compiled JTS 1.12 source under Java 1.4 and I got this breakage in
> GeometryMapper:
>
> Error(74,19):  for-each loops are not supported in -source 1.4
>
>    public static Collection map(Collection geoms, MapOp op)
>    {
>      List mapped = new ArrayList();
>      for (Object o : geoms) {
>        Geometry g = (Geometry) o;
>        Geometry gr = op.map(g);
>        if (gr != null)
>          mapped.add(gr);
>      }
>      return mapped;
>    }
>
> Only one that I can see.
>
> regards
> Simon
> --
> Holder of "2011 Oracle Spatial Excellence Award for Education and
> Research."
> SpatialDB Advice and Design, Solutions Architecture and Programming,
> Oracle Database 10g Administrator Certified Associate; Oracle Database 10g
> SQL Certified Professional
> Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME,
> Radius Topology and Studio Specialist.
> 39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
> Website: http://www.spatialdbadvisor.com
>    Email: simon@...
>    Voice: +61 362 396397
> Mobile: +61 418 396391
> Skype: sggreener
> Longitude: 147.20515 (147° 12' 18" E)
> Latitude: -43.01530 (43° 00' 55" S)
> GeoHash: r22em9r98wg
> NAC:W80CK 7SWP3
>
>
> ------------------------------------------------------------------------------
> Keep yourself connected to Go Parallel:
> BUILD Helping you discover the best ways to construct your parallel
> projects.
> http://goparallel.sourceforge.net
> _______________________________________________
> Jts-topo-suite-user mailing list
> Jts-topo-suite-user@...
> https://lists.sourceforge.net/lists/listinfo/jts-topo-suite-user
>

Same as it always was: deployment inside Oracle database 10gR2 JVM which is 1.4.
Yes, most customers are moving to 11gR2 but some are still on 9i!
S
On Mon, 03 Dec 2012 14:52:29 +1100, Martin Davis <mtnclimb@...> wrote:

> Thanks, Simon.  What's your use case for using JTS under Java 1.4?
>
> On Sun, Dec 2, 2012 at 7:20 PM, Simon Greener <simon@...> wrote:
>> Just compiled JTS 1.12 source under Java 1.4 and I got this breakage in GeometryMapper:
>>
>> Error(74,19):  for-each loops are not supported in -source 1.4
>>
>>   public static Collection map(Collection geoms, MapOp op)
>>   {
>>     List mapped = new ArrayList();
>>     for (Object o : geoms) {
>>       Geometry g = (Geometry) o;
>>       Geometry gr = op.map(g);
>>       if (gr != null)
>>         mapped.add(gr);
>>     }
>>     return mapped;
>>   }
>>
>> Only one that I can see.
>>
>> regards
>> Simon
>> --
>> Holder of "2011 Oracle Spatial Excellence Award for Education and Research."
>> SpatialDB Advice and Design, Solutions Architecture and Programming,
>> Oracle Database 10g Administrator Certified Associate; Oracle Database 10g SQL Certified Professional
>> Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME, Radius Topology and Studio Specialist.
>> 39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
>> Website: http://www.spatialdbadvisor.com
>>   Email: simon@...
>>   Voice: +61 362 396397
>> Mobile: +61 418 396391
>> Skype: sggreener
>> Longitude: 147.20515 (147° 12' 18" E)
>> Latitude: -43.01530 (43° 00' 55" S)
>> GeoHash: r22em9r98wg
>> NAC:W80CK 7SWP3
>>
>> ------------------------------------------------------------------------------
>> Keep yourself connected to Go Parallel:
>> BUILD Helping you discover the best ways to construct your parallel projects.
>> http://goparallel.sourceforge.net
>> _______________________________________________
>> Jts-topo-suite-user mailing list
>> Jts-topo-suite-user@...
>> https://lists.sourceforge.net/lists/listinfo/jts-topo-suite-user
>



-- 
Holder of "2011 Oracle Spatial Excellence Award for Education and Research."
SpatialDB Advice and Design, Solutions Architecture and Programming,
Oracle Database 10g Administrator Certified Associate; Oracle Database 10g SQL Certified Professional
Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME, Radius Topology and Studio Specialist.
39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
Website: http://www.spatialdbadvisor.com
Email: simon@...
Voice: +61 362 396397
Mobile: +61 418 396391
Skype: sggreener
Longitude: 147.20515 (147° 12' 18" E)
Latitude: -43.01530 (43° 00' 55" S)
GeoHash: r22em9r98wg
NAC:W80CK 7SWP3

Sorry, Martin, I linked to tags/Version_1.12 rather than trunk.
Can see the change.
Apologies for the wild goose chase.
Jody Garnett said to me in an email the other day when I asked about Measures in JTS etc due to problems with Coordinate.java and CoordinateSequence.java :

> Yes! And with Martin employed by OpenGeo I think he got in and did some of that recently.

Did you actually do anything?

regards
Simon

> This was fixed in JTS 1.13, as of August 2011.
>
> On Sun, Dec 2, 2012 at 7:20 PM, Simon Greener <simon@...> wrote:
>> Just compiled JTS 1.12 source under Java 1.4 and I got this breakage in GeometryMapper:
>>
>> Error(74,19):  for-each loops are not supported in -source 1.4
>>
>>   public static Collection map(Collection geoms, MapOp op)
>>   {
>>     List mapped = new ArrayList();
>>     for (Object o : geoms) {
>>       Geometry g = (Geometry) o;
>>       Geometry gr = op.map(g);
>>       if (gr != null)
>>         mapped.add(gr);
>>     }
>>     return mapped;
>>   }
>>
>> Only one that I can see.
>>
>> regards
>> Simon
>> --
>> Holder of "2011 Oracle Spatial Excellence Award for Education and Research."
>> SpatialDB Advice and Design, Solutions Architecture and Programming,
>> Oracle Database 10g Administrator Certified Associate; Oracle Database 10g SQL Certified Professional
>> Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME, Radius Topology and Studio Specialist.
>> 39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
>> Website: http://www.spatialdbadvisor.com
>>   Email: simon@...
>>   Voice: +61 362 396397
>> Mobile: +61 418 396391
>> Skype: sggreener
>> Longitude: 147.20515 (147° 12' 18" E)
>> Latitude: -43.01530 (43° 00' 55" S)
>> GeoHash: r22em9r98wg
>> NAC:W80CK 7SWP3
>>
>> ------------------------------------------------------------------------------
>> Keep yourself connected to Go Parallel:
>> BUILD Helping you discover the best ways to construct your parallel projects.
>> http://goparallel.sourceforge.net
>> _______________________________________________
>> Jts-topo-suite-user mailing list
>> Jts-topo-suite-user@...
>> https://lists.sourceforge.net/lists/listinfo/jts-topo-suite-user
>



-- 
Holder of "2011 Oracle Spatial Excellence Award for Education and Research."
SpatialDB Advice and Design, Solutions Architecture and Programming,
Oracle Database 10g Administrator Certified Associate; Oracle Database 10g SQL Certified Professional
Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME, Radius Topology and Studio Specialist.
39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
Website: http://www.spatialdbadvisor.com
Email: simon@...
Voice: +61 362 396397
Mobile: +61 418 396391
Skype: sggreener
Longitude: 147.20515 (147° 12' 18" E)
Latitude: -43.01530 (43° 00' 55" S)
GeoHash: r22em9r98wg
NAC:W80CK 7SWP3

Martin,

I call your GMLReader as follows:

             STRUCT res = SC4O.ST_GeomFromGML("<gml:Polygon xmlns:gml=\"http://www.opengis.net/gml/3.2\" gml:id=\"bp1\" srsName=\"EPSG:4326\" srsDimension=\"2\"> <gml:exterior> <gml:LinearRing><gml:posList>115.25 4.5 115.25 4.25 115.5 4.25 115.5 4.5 115.25 4.5</gml:posList></gml:LinearRing></gml:exterior></gml:Polygon>");

     public static STRUCT ST_GeomFromGML(String _gml)
     throws SQLException
     {
...
             GMLReader gr = new GMLReader();
             try
             {
                Geometry geom = gr.read(_gml,gf);

And I get this:

java.lang.NullPointerException
	at com.vividsolutions.jts.io.gml2.GMLHandler$Handler.create(GMLHandler.java:121)
	at com.vividsolutions.jts.io.gml2.GMLHandler.endElement(GMLHandler.java:217)
	at oracle.xml.parser.v2.NonValidatingParser.parseElement(NonValidatingParser.java:1306)
	at oracle.xml.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:324)
	at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:291)
	at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:207)
	at oracle.xml.jaxp.JXSAXParser.parse(JXSAXParser.java:292)
	at com.vividsolutions.jts.io.gml2.GMLReader.read(GMLReader.java:127)
	at com.vividsolutions.jts.io.gml2.GMLReader.read(GMLReader.java:101)
	at com.spatialdbadvisor.dbutils.ora.SC4O.ST_GeomFromGML(SC4O.java:1896)

The NullPointerException is here:

		/**
		 * @param gf GeometryFactory
		 * @return Parsed Object
		 * @throws SAXException
		 */
		public Object create(GeometryFactory gf) throws SAXException {
			return strategy.parse(this, gf);
		}

And is because strategy (protected ParseStrategy strategy) is null.

Now, it took a while but I finally realised that this way probably because I was passing in GML3.2 and not GML2. If so, why would it not give a better exception than the impossibly opaque NullPointerException?

Is there a better place to get GML etc conversion open source Java?

regards
SImon







On Mon, 03 Dec 2012 14:55:10 +1100, Martin Davis <mtnclimb@...> wrote:

> This was fixed in JTS 1.13, as of August 2011.
>
> On Sun, Dec 2, 2012 at 7:20 PM, Simon Greener <simon@...> wrote:
>
>> Just compiled JTS 1.12 source under Java 1.4 and I got this breakage in GeometryMapper:
>>
>>
>>
>> Error(74,19):  for-each loops are not supported in -source 1.4
>>
>>
>>
>>   public static Collection map(Collection geoms, MapOp op)
>>
>>   {
>>
>>     List mapped = new ArrayList();
>>
>>     for (Object o : geoms) {
>>
>>       Geometry g = (Geometry) o;
>>
>>       Geometry gr = op.map(g);
>>
>>       if (gr != null)
>>
>>         mapped.add(gr);
>>
>>     }
>>
>>     return mapped;
>>
>>   }
>>
>>
>>
>> Only one that I can see.
>>
>>
>>
>> regards
>>
>> Simon
>>
>> --
>>
>> Holder of "2011 Oracle Spatial Excellence Award for Education and Research."
>>
>> SpatialDB Advice and Design, Solutions Architecture and Programming,
>>
>> Oracle Database 10g Administrator Certified Associate; Oracle Database 10g SQL Certified Professional
>>
>> Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME, Radius Topology and Studio >>Specialist.
>>
>> 39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
>>
>> Website: http://www.spatialdbadvisor.com
>>
>>   Email: simon@...
>>
>>   Voice: +61 362 396397
>>
>> Mobile: +61 418 396391
>>
>> Skype: sggreener
>>
>> Longitude: 147.20515 (147° 12' 18" E)
>>
>> Latitude: -43.01530 (43° 00' 55" S)
>>
>> GeoHash: r22em9r98wg
>>
>> NAC:W80CK 7SWP3
>>
>>
>>
>> ------------------------------------------------------------------------------
>>
>> Keep yourself connected to Go Parallel:
>>
>> BUILD Helping you discover the best ways to construct your parallel projects.
>>
>> http://goparallel.sourceforge.net
>>
>> _______________________________________________
>>
>> Jts-topo-suite-user mailing list
>>
>> Jts-topo-suite-user@...
>>
>> https://lists.sourceforge.net/lists/listinfo/jts-topo-suite-user
>>
>
>



-- 
Holder of "2011 Oracle Spatial Excellence Award for Education and Research."
SpatialDB Advice and Design, Solutions Architecture and Programming,
Oracle Database 10g Administrator Certified Associate; Oracle Database 10g SQL Certified Professional
Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME, Radius Topology and Studio Specialist.
39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
Website: http://www.spatialdbadvisor.com
   Email: simon@...
   Voice: +61 362 396397
Mobile: +61 418 396391
Skype: sggreener
Longitude: 147.20515 (147° 12' 18" E)
Latitude: -43.01530 (43° 00' 55" S)
GeoHash: r22em9r98wg
NAC:W80CK 7SWP3

No, nothing new on the measures front.

On Sun, Dec 2, 2012 at 8:55 PM, Simon Greener <simon@...:

> **
> Sorry, Martin, I linked to tags/Version_1.12 rather than trunk.
> Can see the change.
> Apologies for the wild goose chase.
> Jody Garnett said to me in an email the other day when I asked about
> Measures in JTS etc due to problems with Coordinate.java and
> CoordinateSequence.java :
>
> > Yes! And with Martin employed by OpenGeo I think he got in and did some
> of that recently.
>
> Did you actually do anything?
>
> regards
> Simon
>
> This was fixed in JTS 1.13, as of August 2011.
>
> On Sun, Dec 2, 2012 at 7:20 PM, Simon Greener <simon@...:
>
>> Just compiled JTS 1.12 source under Java 1.4 and I got this breakage in
>> GeometryMapper:
>>
>> Error(74,19):  for-each loops are not supported in -source 1.4
>>
>>    public static Collection map(Collection geoms, MapOp op)
>>    {
>>      List mapped = new ArrayList();
>>      for (Object o : geoms) {
>>        Geometry g = (Geometry) o;
>>        Geometry gr = op.map(g);
>>        if (gr != null)
>>          mapped.add(gr);
>>      }
>>      return mapped;
>>    }
>>
>> Only one that I can see.
>>
>> regards
>> Simon
>> --
>> Holder of "2011 Oracle Spatial Excellence Award for Education and
>> Research."
>> SpatialDB Advice and Design, Solutions Architecture and Programming,
>> Oracle Database 10g Administrator Certified Associate; Oracle Database
>> 10g SQL Certified Professional
>> Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME,
>> Radius Topology and Studio Specialist.
>> 39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
>> Website: http://www.spatialdbadvisor.com
>>    Email: simon@...
>>    Voice: +61 362 396397
>> Mobile: +61 418 396391
>> Skype: sggreener
>> Longitude: 147.20515 (147° 12' 18" E)
>> Latitude: -43.01530 (43° 00' 55" S)
>> GeoHash: r22em9r98wg
>> NAC:W80CK 7SWP3
>>
>>
>> ------------------------------------------------------------------------------
>> Keep yourself connected to Go Parallel:
>> BUILD Helping you discover the best ways to construct your parallel
>> projects.
>> http://goparallel.sourceforge.net
>> _______________________________________________
>> Jts-topo-suite-user mailing list
>> Jts-topo-suite-user@...
>> https://lists.sourceforge.net/lists/listinfo/jts-topo-suite-user
>>
>
>
>
>
> --
> Holder of "2011 Oracle Spatial Excellence Award for Education and
> Research."
> SpatialDB Advice and Design, Solutions Architecture and Programming,
> Oracle Database 10g Administrator Certified Associate; Oracle Database 10g
> SQL Certified Professional
> Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME,
> Radius Topology and Studio Specialist.
> 39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia.
> Website: http://www.spatialdbadvisor.com
> Email: simon@...
> Voice: +61 362 396397
> Mobile: +61 418 396391
> Skype: sggreener
> Longitude: 147.20515 (147° 12' 18" E)
> Latitude: -43.01530 (43° 00' 55" S)
> GeoHash: r22em9r98wg
> NAC:W80CK 7SWP3
>

Yuck.  Agreed, it would be nicer to have a more graceful failure if passed
something that is not GML2.

That code is pretty complex, and I think was originally extracted from a
more full-featured GML parser (the original GeoTools one).  I'm not sure
how best to fix it up - perhaps Dave Zweirs can comment.

As for open-source GML parsers, you might look at GeoTools.

On Sun, Dec 2, 2012 at 9:10 PM, Simon Greener <simon@...:

> Martin,
>
> I call your GMLReader as follows:
>
>              STRUCT res = SC4O.ST_GeomFromGML("<gml:Polygon xmlns:gml=\"
> http://www.opengis.net/gml/3.2\" gml:id=\"bp1\" srsName=\"EPSG:4326\"
> srsDimension=\"2\"> <gml:exterior> <gml:LinearRing><gml:posList>115.25 4.5
> 115.25 4.25 115.5 4.25 115.5 4.5 115.25
> 4.5</gml:posList></gml:LinearRing></gml:exterior></gml:Polygon>");
>
>      public static STRUCT ST_GeomFromGML(String _gml)
>      throws SQLException
>      {
> ...
>              GMLReader gr = new GMLReader();
>              try
>              {
>                 Geometry geom = gr.read(_gml,gf);
>
> And I get this:
>
> java.lang.NullPointerException
>         at
> com.vividsolutions.jts.io.gml2.GMLHandler$Handler.create(GMLHandler.java:121)
>         at
> com.vividsolutions.jts.io.gml2.GMLHandler.endElement(GMLHandler.java:217)
>         at
> oracle.xml.parser.v2.NonValidatingParser.parseElement(NonValidatingParser.java:1306)
>         at
> oracle.xml.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:324)
>         at
> oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:291)
>         at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:207)
>         at oracle.xml.jaxp.JXSAXParser.parse(JXSAXParser.java:292)
>         at
> com.vividsolutions.jts.io.gml2.GMLReader.read(GMLReader.java:127)
>         at
> com.vividsolutions.jts.io.gml2.GMLReader.read(GMLReader.java:101)
>         at
> com.spatialdbadvisor.dbutils.ora.SC4O.ST_GeomFromGML(SC4O.java:1896)
>
> The NullPointerException is here:
>
>                 /**
>                  * @param gf GeometryFactory
>                  * @return Parsed Object
>                  * @throws SAXException
>                  */
>                 public Object create(GeometryFactory gf) throws
> SAXException {
>                         return strategy.parse(this, gf);
>                 }
>
> And is because strategy (protected ParseStrategy strategy) is null.
>
> Now, it took a while but I finally realised that this way probably because
> I was passing in GML3.2 and not GML2. If so, why would it not give a better
> exception than the impossibly opaque NullPointerException?
>
> Is there a better place to get GML etc conversion open source Java?
>
>
>

Martin,

> Yuck.  Agreed, it would be nicer to have a more graceful failure if passed something that is not GML2.  
> That code is pretty complex, and I think was originally extracted from a more full-featured GML parser (the original GeoTools one).  I'm not sure >how best to fix it up - perhaps Dave Zweirs can comment.
>
> As for open-source GML parsers, you might look at GeoTools.

Thought so. Will take a look.

Thanks again.

regards
Simon
>
>
> On Sun, Dec 2, 2012 at 9:10 PM, Simon Greener <simon@...> wrote:
>> Martin,
>>
>> I call your GMLReader as follows:
>>
>>             STRUCT res = SC4O.ST_GeomFromGML("<gml:Polygon xmlns:gml=\"http://www.opengis.net/gml/3.2\" gml:id=\"bp1\" srsName=>>\"EPSG:4326\" srsDimension=\"2\"> <gml:exterior> <gml:LinearRing><gml:posList>115.25 4.5 115.25 4.25 115.5 4.25 115.5 4.5 115.25 4.5</>>gml:posList></gml:LinearRing></gml:exterior></gml:Polygon>");
>>
>>     public static STRUCT ST_GeomFromGML(String _gml)
>>     throws SQLException
>>     {
>> ...
>>             GMLReader gr = new GMLReader();
>>             try
>>             {
>>                Geometry geom = gr.read(_gml,gf);
>>
>> And I get this:
>>
>> java.lang.NullPointerException
>>        at com.vividsolutions.jts.io.gml2.GMLHandler$Handler.create(GMLHandler.java:121)
>>        at com.vividsolutions.jts.io.gml2.GMLHandler.endElement(GMLHandler.java:217)
>>        at oracle.xml.parser.v2.NonValidatingParser.parseElement(NonValidatingParser.java:1306)
>>        at oracle.xml.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:324)
>>        at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:291)
>>        at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:207)
>>        at oracle.xml.jaxp.JXSAXParser.parse(JXSAXParser.java:292)
>>        at com.vividsolutions.jts.io.gml2.GMLReader.read(GMLReader.java:127)
>>        at com.vividsolutions.jts.io.gml2.GMLReader.read(GMLReader.java:101)
>>        at com.spatialdbadvisor.dbutils.ora.SC4O.ST_GeomFromGML(SC4O.java:1896)
>>
>> The NullPointerException is here:
>>
>>                /**
>>                 * @param gf GeometryFactory
>>                 * @return Parsed Object
>>                 * @throws SAXException
>>                 */
>>                public Object create(GeometryFactory gf) throws SAXException {
>>                        return strategy.parse(this, gf);
>>                }
>>
>> And is because strategy (protected ParseStrategy strategy) is null.
>>
>> Now, it took a while but I finally realised that this way probably because I was passing in GML3.2 and not GML2. If so, why would it not >>give a better exception than the impossibly opaque NullPointerException?
>>
>> Is there a better place to get GML etc conversion open source Java?
>>
>>
>



-- 
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Hi, Friends,

ESRI ArcGIS has got a feature to polygon function.

What is the exact equivalent in JTS?

Regards.

David

JTS doesn't have the concept of a Feature.  This is something which is 
typically defined in higher-level libraries or applications (such as 
GeoTools or OpenJUMP).

On 12/3/2012 2:30 AM, David Shi wrote:
> Hi, Friends,
>
> ESRI ArcGIS has got a feature to polygon function.
>
> What is the exact equivalent in JTS?
>
> Regards.
>
> David
>
>
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