76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
/**********************************************************************
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*
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* PostGIS - Spatial Types for PostgreSQL
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* http://postgis.net
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*
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* PostGIS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* PostGIS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with PostGIS. If not, see <http://www.gnu.org/licenses/>.
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*
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**********************************************************************
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*
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* Copyright 2008 Paul Ramsey <pramsey@cleverelephant.ca>
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*
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**********************************************************************/
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#ifndef LWGEOM_GEOS_PREPARED_H_
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#define LWGEOM_GEOS_PREPARED_H_ 1
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#include "postgres.h"
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#include "fmgr.h"
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#include "miscadmin.h"
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#include "utils/hsearch.h"
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#include "utils/memutils.h"
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#include "access/hash.h"
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#include "lwgeom_pg.h"
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#include "liblwgeom.h"
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#include "lwgeom_geos.h"
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#include "lwgeom_cache.h"
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/*
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* Cache structure. We use GSERIALIZED as keys so no transformations
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* are needed before we memcmp them with other keys. We store the
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* size to avoid having to calculate the size every time.
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* The argnum gives the number of function arguments we are caching.
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* Intersects requires that both arguments be checked for cacheability,
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* while Contains only requires that the containing argument be checked.
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* Both the Geometry and the PreparedGeometry have to be cached,
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* because the PreparedGeometry contains a reference to the geometry.
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*
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* Note that the first 6 entries are part of the common GeomCache
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* structure and have to remain in order to allow the overall caching
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* system to share code (the cache checking code is common between
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* prepared geometry, circtrees, recttrees, and rtrees).
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*/
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typedef struct {
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GeomCache gcache;
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MemoryContext context_statement;
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MemoryContext context_callback;
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const GEOSPreparedGeometry* prepared_geom;
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const GEOSGeometry* geom;
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} PrepGeomCache;
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/*
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** Get the current cache, given the input geometries.
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** Function will create cache if none exists, and prepare geometries in
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** cache if necessary, or pull an existing cache if possible.
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**
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** If you are only caching one argument (e.g., in contains) supply 0 as the
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** value for pg_geom2.
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*/
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PrepGeomCache *GetPrepGeomCache(FunctionCallInfo fcinfo, SHARED_GSERIALIZED *pg_geom1, SHARED_GSERIALIZED *pg_geom2);
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#endif /* LWGEOM_GEOS_PREPARED_H_ */
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