[Geotools-commits] svn - r38630 - in trunk/modules/library/main/src: main/java/org/geotools/geometry/jts test/java/org/geotools/geometry/jts

[<svn...@os...>]

Author: aaime
Date: 2012-03-16 05:53:19 -0700 (Fri, 16 Mar 2012)
New Revision: 38630

Modified:
   trunk/modules/library/main/src/main/java/org/geotools/geometry/jts/GeometryCollector.java
   trunk/modules/library/main/src/test/java/org/geotools/geometry/jts/GeometryCollectorTest.java
Log:
[GEOT-4077] GeometryCollector can build invalid geometries

Modified: trunk/modules/library/main/src/main/java/org/geotools/geometry/jts/GeometryCollector.java
===================================================================
--- trunk/modules/library/main/src/main/java/org/geotools/geometry/jts/GeometryCollector.java	2012-03-13 09:07:21 UTC (rev 38629)
+++ trunk/modules/library/main/src/main/java/org/geotools/geometry/jts/GeometryCollector.java	2012-03-16 12:53:19 UTC (rev 38630)
@@ -144,7 +144,19 @@
             return gf.createMultiPoint(array);
         } else if (collectionClass == MultiPolygon.class) {
             Polygon[] array = (Polygon[]) geometries.toArray(new Polygon[geometries.size()]);
-            return gf.createMultiPolygon(array);
+            MultiPolygon mp = gf.createMultiPolygon(array);
+            
+            // a collection of valid polygon does not necessarily make up a valid multipolygon
+            if(array.length > 1 && !mp.isValid()) {
+                Geometry g = mp.buffer(0);
+                if(g instanceof Polygon) {
+                    return gf.createMultiPolygon(new Polygon[] {(Polygon) g});
+                } else {
+                    return (GeometryCollection) g;
+                }
+            } else {
+                return mp;
+            }
         } else if (collectionClass == MultiLineString.class) {
             LineString[] array = (LineString[]) geometries
                     .toArray(new LineString[geometries.size()]);

Modified: trunk/modules/library/main/src/test/java/org/geotools/geometry/jts/GeometryCollectorTest.java
===================================================================
--- trunk/modules/library/main/src/test/java/org/geotools/geometry/jts/GeometryCollectorTest.java	2012-03-13 09:07:21 UTC (rev 38629)
+++ trunk/modules/library/main/src/test/java/org/geotools/geometry/jts/GeometryCollectorTest.java	2012-03-16 12:53:19 UTC (rev 38630)
@@ -3,13 +3,13 @@
 import static org.junit.Assert.*;
 
 import org.geotools.factory.CommonFactoryFinder;
-import org.geotools.referencing.crs.DefaultGeocentricCRS;
 import org.geotools.referencing.crs.DefaultGeographicCRS;
 import org.junit.Test;
 import org.opengis.filter.FilterFactory2;
 
 import com.vividsolutions.jts.geom.Geometry;
 import com.vividsolutions.jts.geom.GeometryCollection;
+import com.vividsolutions.jts.geom.Polygon;
 import com.vividsolutions.jts.io.WKTReader;
 
 /**
@@ -54,7 +54,25 @@
         assertSame(p0, result.getGeometryN(0));
         assertSame(p1, result.getGeometryN(1));
     }
+    
+    @Test
+    public void testInvalidMultipolygon() throws Exception {
+        WKTReader reader = new WKTReader();
 
+        // three triangles that united form a rectangle with a triangular hole in the middle
+        GeometryCollector collector = new GeometryCollector();
+        collector.setFactory(null);
+        final Geometry p0 = reader.read("POLYGON((0 0, 0 3, 3 3, 3 0, 0 0))");
+        collector.add(p0);
+        final Geometry p1 = reader.read("POLYGON((1 1, 1 2, 2 2, 2 1, 1 1))");
+        collector.add(p1);
+
+        GeometryCollection result = collector.collect();
+        assertEquals(1, result.getNumGeometries());
+        Polygon p = (com.vividsolutions.jts.geom.Polygon) result.getGeometryN(0);
+        assertTrue(p.isValid());
+    }
+
     @Test
     public void testTooMany() throws Exception {
         WKTReader reader = new WKTReader();