[Geoserver-devel] Modify geometry of feature?

GeoServer GeoServer Developer
1

Hi list,
I have to develop a module that modify geometry of polygon. Is there anyone worked with same function in geotools?
Any suggestion is good for me.
Thanks.
2

Hi, You can find a wealth of information in the user guide, specifically the feature tutorial: The following section is about writing features: To modify a feature, instead of SimpleFeatureStore.addFeatures() you should call the SimpleFeatureStore.modifyFeatures() method, documented at: Note that you need to reference the feature you are going to modify with the “filter” parameter. To do this, your best bet is to create a filter on the feature ID you get when calling SimpleFeature.getID() as follows: // get feature SimpleFeature myFeature = …; String fid = myFeature.getID(); // get the geometry com.vividsolutions.jts.geom.Geometry g = (com.vividsolutions.jts.geom.Geometry)myFeature.getDefaultGeometry(); // modify it g = g.buffer(10.0); // save it SimpleFeatureStore store = …; Transaction transaction = new DefaultTransaction(“edit”); store.setTransaction(transaction); // reference the feature to modify by FID FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(); Filter filter = ff.id(new FeatureIdImpl(fid)); store.modifyFeatures( store.getSchema().getGeometryDescriptor().getName(), g, filter); transaction.commit(); Matthijs

···

On 2012-07-23 11:31, Truong Pham Minh wrote:

Hi list,
I have to develop a module that modify geometry of polygon. Is there anyone worked with same function in geotools?
Any suggestion is good for me.
Thanks.

http://docs.geotools.org/latest/userguide/tutorial/feature/csv2shp.html

http://docs.geotools.org/latest/userguide/tutorial/feature/csv2shp.html#write-the-feature-data-to-the-shapefile

http://docs.geotools.org/latest/javadocs/index.html?org/geotools/data/simple/SimpleFeatureStore.html

3
Million thanks Matthijs Laan for your nice answer. It very helpful for me.

— Ngày Thứ 2, 23/07/12, Matthijs Laan <matthijslaan@anonymised.com> đã viết:

Từ: Matthijs Laan <matthijslaan@anonymised.com>
Chủ đề: Re: [Geoserver-devel] Modify geometry of feature?
Đến: geoserver-devel@lists.sourceforge.net
Ngày: Thứ Hai, 23 tháng 7, 2012, 6:39

On 2012-07-23 11:31, Truong Pham Minh wrote:

Hi list,
I have to develop a module that modify geometry of polygon. Is there anyone worked with same function in geotools?
Any suggestion is good for me.
Thanks.

Hi,

You can find a wealth of information in the user guide, specifically the feature tutorial:

http://docs.geotools.org/latest/userguide/tutorial/feature/csv2shp.html

The following section is about writing features:
http://docs.geotools.org/latest/userguide/tutorial/feature/csv2shp.html#write-the-feature-data-to-the-shapefile

To modify a feature, instead of SimpleFeatureStore.addFeatures() you should call the SimpleFeatureStore.modifyFeatures() method, documented at:
http://docs.geotools.org/latest/javadocs/index.html?org/geotools/data/simple/SimpleFeatureStore.html

Note that you need to reference the feature you are going to modify with the “filter” parameter. To do this, your best bet is to create a filter on the feature ID you get when calling SimpleFeature.getID() as follows:

// get feature
SimpleFeature myFeature = …;
String fid = myFeature.getID();

// get the geometry
com.vividsolutions.jts.geom.Geometry g = (com.vividsolutions.jts.geom.Geometry)myFeature.getDefaultGeometry();

// modify it
g = g.buffer(10.0);

// save it
SimpleFeatureStore store = …;
Transaction transaction = new DefaultTransaction(“edit”);
store.setTransaction(transaction);

// reference the feature to modify by FID
FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2();
Filter filter = ff.id(new FeatureIdImpl(fid));

store.modifyFeatures( store.getSchema().getGeometryDescriptor().getName(), g, filter);
transaction.commit();

Matthijs

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