1 files changed, 43 insertions, 0 deletions
diff --git a/webapp/django/contrib/gis/geos/prototypes/predicates.py b/webapp/django/contrib/gis/geos/prototypes/predicates.py
new file mode 100644
index 0000000000..45240d971a
--- /dev/null
+++ b/webapp/django/contrib/gis/geos/prototypes/predicates.py
@@ -0,0 +1,43 @@
+"""
+ This module houses the GEOS ctypes prototype functions for the 
+ unary and binary predicate operations on geometries.
+"""
+from ctypes import c_char, c_char_p, c_double
+from django.contrib.gis.geos.libgeos import lgeos, GEOM_PTR
+from django.contrib.gis.geos.prototypes.errcheck import check_predicate
+
+## Binary & unary predicate functions ##
+def binary_predicate(func, *args):
+    "For GEOS binary predicate functions."
+    argtypes = [GEOM_PTR, GEOM_PTR]
+    if args: argtypes += args
+    func.argtypes = argtypes
+    func.restype = c_char
+    func.errcheck = check_predicate
+    return func
+
+def unary_predicate(func):
+    "For GEOS unary predicate functions."
+    func.argtypes = [GEOM_PTR]
+    func.restype = c_char
+    func.errcheck = check_predicate
+    return func
+
+## Unary Predicates ##
+geos_hasz = unary_predicate(lgeos.GEOSHasZ)
+geos_isempty = unary_predicate(lgeos.GEOSisEmpty)
+geos_isring = unary_predicate(lgeos.GEOSisRing)
+geos_issimple = unary_predicate(lgeos.GEOSisSimple)
+geos_isvalid = unary_predicate(lgeos.GEOSisValid)
+
+## Binary Predicates ##
+geos_contains = binary_predicate(lgeos.GEOSContains)
+geos_crosses = binary_predicate(lgeos.GEOSCrosses)
+geos_disjoint = binary_predicate(lgeos.GEOSDisjoint)
+geos_equals = binary_predicate(lgeos.GEOSEquals)
+geos_equalsexact = binary_predicate(lgeos.GEOSEqualsExact, c_double)
+geos_intersects = binary_predicate(lgeos.GEOSIntersects)
+geos_overlaps = binary_predicate(lgeos.GEOSOverlaps)
+geos_relatepattern = binary_predicate(lgeos.GEOSRelatePattern, c_char_p)
+geos_touches = binary_predicate(lgeos.GEOSTouches)
+geos_within = binary_predicate(lgeos.GEOSWithin)