item_geofunc.cpp
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:15k
- /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- /* This file defines all spatial functions */
- #ifdef USE_PRAGMA_IMPLEMENTATION
- #pragma implementation // gcc: Class implementation
- #endif
- #include "mysql_priv.h"
- #ifdef HAVE_SPATIAL
- #include <m_ctype.h>
- void Item_geometry_func::fix_length_and_dec()
- {
- collation.set(&my_charset_bin);
- decimals=0;
- max_length=MAX_BLOB_WIDTH;
- }
- String *Item_func_geometry_from_text::val_str(String *str)
- {
- DBUG_ASSERT(fixed == 1);
- Geometry_buffer buffer;
- String arg_val;
- String *wkt= args[0]->val_str(&arg_val);
- if ((null_value= args[0]->null_value))
- return 0;
- Gis_read_stream trs(wkt->charset(), wkt->ptr(), wkt->length());
- uint32 srid= 0;
- if ((arg_count == 2) && !args[1]->null_value)
- srid= (uint32)args[1]->val_int();
- str->set_charset(&my_charset_bin);
- if (str->reserve(SRID_SIZE, 512))
- return 0;
- str->length(0);
- str->q_append(srid);
- if ((null_value= !Geometry::create_from_wkt(&buffer, &trs, str, 0)))
- return 0;
- return str;
- }
- String *Item_func_geometry_from_wkb::val_str(String *str)
- {
- DBUG_ASSERT(fixed == 1);
- String arg_val;
- String *wkb= args[0]->val_str(&arg_val);
- Geometry_buffer buffer;
- uint32 srid= 0;
- if ((arg_count == 2) && !args[1]->null_value)
- srid= (uint32)args[1]->val_int();
- str->set_charset(&my_charset_bin);
- if (str->reserve(SRID_SIZE, 512))
- return 0;
- str->length(0);
- str->q_append(srid);
- if ((null_value=
- (args[0]->null_value ||
- !Geometry::create_from_wkb(&buffer, wkb->ptr(), wkb->length(), str))))
- return 0;
- return str;
- }
- String *Item_func_as_wkt::val_str(String *str)
- {
- DBUG_ASSERT(fixed == 1);
- String arg_val;
- String *swkb= args[0]->val_str(&arg_val);
- Geometry_buffer buffer;
- Geometry *geom= NULL;
- const char *dummy;
- if ((null_value=
- (args[0]->null_value ||
- !(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length())))))
- return 0;
- str->length(0);
- if ((null_value= geom->as_wkt(str, &dummy)))
- return 0;
- return str;
- }
- void Item_func_as_wkt::fix_length_and_dec()
- {
- max_length=MAX_BLOB_WIDTH;
- }
- String *Item_func_as_wkb::val_str(String *str)
- {
- DBUG_ASSERT(fixed == 1);
- String arg_val;
- String *swkb= args[0]->val_str(&arg_val);
- Geometry_buffer buffer;
- if ((null_value=
- (args[0]->null_value ||
- !(Geometry::construct(&buffer, swkb->ptr(), swkb->length())))))
- return 0;
- str->copy(swkb->ptr() + SRID_SIZE, swkb->length() - SRID_SIZE,
- &my_charset_bin);
- return str;
- }
- String *Item_func_geometry_type::val_str(String *str)
- {
- DBUG_ASSERT(fixed == 1);
- String *swkb= args[0]->val_str(str);
- Geometry_buffer buffer;
- Geometry *geom= NULL;
- if ((null_value=
- (args[0]->null_value ||
- !(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length())))))
- return 0;
- /* String will not move */
- str->copy(geom->get_class_info()->m_name.str,
- geom->get_class_info()->m_name.length,
- default_charset());
- return str;
- }
- String *Item_func_envelope::val_str(String *str)
- {
- DBUG_ASSERT(fixed == 1);
- String arg_val;
- String *swkb= args[0]->val_str(&arg_val);
- Geometry_buffer buffer;
- Geometry *geom= NULL;
- uint32 srid;
-
- if ((null_value=
- args[0]->null_value ||
- !(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length()))))
- return 0;
-
- srid= uint4korr(swkb->ptr());
- str->set_charset(&my_charset_bin);
- str->length(0);
- if (str->reserve(SRID_SIZE, 512))
- return 0;
- str->q_append(srid);
- return (null_value= geom->envelope(str)) ? 0 : str;
- }
- String *Item_func_centroid::val_str(String *str)
- {
- DBUG_ASSERT(fixed == 1);
- String arg_val;
- String *swkb= args[0]->val_str(&arg_val);
- Geometry_buffer buffer;
- Geometry *geom= NULL;
- uint32 srid;
- if ((null_value= args[0]->null_value ||
- !(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length()))))
- return 0;
- str->set_charset(&my_charset_bin);
- if (str->reserve(SRID_SIZE, 512))
- return 0;
- str->length(0);
- srid= uint4korr(swkb->ptr());
- str->q_append(srid);
- return (null_value= test(geom->centroid(str))) ? 0 : str;
- }
- /*
- Spatial decomposition functions
- */
- String *Item_func_spatial_decomp::val_str(String *str)
- {
- DBUG_ASSERT(fixed == 1);
- String arg_val;
- String *swkb= args[0]->val_str(&arg_val);
- Geometry_buffer buffer;
- Geometry *geom= NULL;
- uint32 srid;
- if ((null_value=
- (args[0]->null_value ||
- !(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length())))))
- return 0;
- srid= uint4korr(swkb->ptr());
- str->set_charset(&my_charset_bin);
- if (str->reserve(SRID_SIZE, 512))
- goto err;
- str->length(0);
- str->q_append(srid);
- switch (decomp_func) {
- case SP_STARTPOINT:
- if (geom->start_point(str))
- goto err;
- break;
- case SP_ENDPOINT:
- if (geom->end_point(str))
- goto err;
- break;
- case SP_EXTERIORRING:
- if (geom->exterior_ring(str))
- goto err;
- break;
- default:
- goto err;
- }
- return str;
- err:
- null_value= 1;
- return 0;
- }
- String *Item_func_spatial_decomp_n::val_str(String *str)
- {
- DBUG_ASSERT(fixed == 1);
- String arg_val;
- String *swkb= args[0]->val_str(&arg_val);
- long n= (long) args[1]->val_int();
- Geometry_buffer buffer;
- Geometry *geom= NULL;
- uint32 srid;
- if ((null_value=
- (args[0]->null_value || args[1]->null_value ||
- !(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length())))))
- return 0;
- str->set_charset(&my_charset_bin);
- if (str->reserve(SRID_SIZE, 512))
- goto err;
- srid= uint4korr(swkb->ptr());
- str->length(0);
- str->q_append(srid);
- switch (decomp_func_n)
- {
- case SP_POINTN:
- if (geom->point_n(n,str))
- goto err;
- break;
- case SP_GEOMETRYN:
- if (geom->geometry_n(n,str))
- goto err;
- break;
- case SP_INTERIORRINGN:
- if (geom->interior_ring_n(n,str))
- goto err;
- break;
- default:
- goto err;
- }
- return str;
- err:
- null_value=1;
- return 0;
- }
- /*
- Functions to concatenate various spatial objects
- */
- /*
- * Concatenate doubles into Point
- */
- String *Item_func_point::val_str(String *str)
- {
- DBUG_ASSERT(fixed == 1);
- double x= args[0]->val();
- double y= args[1]->val();
- if ((null_value= (args[0]->null_value ||
- args[1]->null_value ||
- str->realloc(1 + 4 + SIZEOF_STORED_DOUBLE*2))))
- return 0;
- str->set_charset(&my_charset_bin);
- str->length(0);
- str->q_append((char)Geometry::wkb_ndr);
- str->q_append((uint32)Geometry::wkb_point);
- str->q_append(x);
- str->q_append(y);
- return str;
- }
- /*
- Concatenates various items into various collections
- with checkings for valid wkb type of items.
- For example, MultiPoint can be a collection of Points only.
- coll_type contains wkb type of target collection.
- item_type contains a valid wkb type of items.
- In the case when coll_type is wkbGeometryCollection,
- we do not check wkb type of items, any is valid.
- */
- String *Item_func_spatial_collection::val_str(String *str)
- {
- DBUG_ASSERT(fixed == 1);
- String arg_value;
- uint i;
- str->set_charset(&my_charset_bin);
- str->length(0);
- if (str->reserve(1 + 4 + 4, 512))
- goto err;
- str->q_append((char) Geometry::wkb_ndr);
- str->q_append((uint32) coll_type);
- str->q_append((uint32) arg_count);
- for (i= 0; i < arg_count; ++i)
- {
- String *res= args[i]->val_str(&arg_value);
- if (args[i]->null_value)
- goto err;
- if (coll_type == Geometry::wkb_geometrycollection)
- {
- /*
- In the case of GeometryCollection we don't need any checkings
- for item types, so just copy them into target collection
- */
- if (str->append(res->ptr(), res->length(), (uint32) 512))
- goto err;
- }
- else
- {
- enum Geometry::wkbType wkb_type;
- uint32 len=res->length();
- const char *data= res->ptr() + 1;
- /*
- In the case of named collection we must check that items
- are of specific type, let's do this checking now
- */
- if (len < 5)
- goto err;
- wkb_type= (Geometry::wkbType) uint4korr(data);
- data+= 4;
- len-= 5;
- if (wkb_type != item_type)
- goto err;
- switch (coll_type) {
- case Geometry::wkb_multipoint:
- case Geometry::wkb_multilinestring:
- case Geometry::wkb_multipolygon:
- if (len < WKB_HEADER_SIZE ||
- str->append(data-WKB_HEADER_SIZE, len+WKB_HEADER_SIZE, 512))
- goto err;
- break;
- case Geometry::wkb_linestring:
- if (str->append(data, POINT_DATA_SIZE, 512))
- goto err;
- break;
- case Geometry::wkb_polygon:
- {
- uint32 n_points;
- double x1, y1, x2, y2;
- const char *org_data= data;
- if (len < 4 + 2 * POINT_DATA_SIZE)
- goto err;
- n_points= uint4korr(data);
- data+= 4;
- float8get(x1, data);
- data+= SIZEOF_STORED_DOUBLE;
- float8get(y1, data);
- data+= SIZEOF_STORED_DOUBLE;
- data+= (n_points - 2) * POINT_DATA_SIZE;
- float8get(x2, data);
- float8get(y2, data + SIZEOF_STORED_DOUBLE);
- if ((x1 != x2) || (y1 != y2) ||
- str->append(org_data, len, 512))
- goto err;
- }
- break;
- default:
- goto err;
- }
- }
- }
- if (str->length() > current_thd->variables.max_allowed_packet)
- {
- push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
- ER_WARN_ALLOWED_PACKET_OVERFLOWED,
- ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
- func_name(), current_thd->variables.max_allowed_packet);
- goto err;
- }
- null_value = 0;
- return str;
- err:
- null_value= 1;
- return 0;
- }
- /*
- Functions for spatial relations
- */
- longlong Item_func_spatial_rel::val_int()
- {
- DBUG_ASSERT(fixed == 1);
- String *res1= args[0]->val_str(&tmp_value1);
- String *res2= args[1]->val_str(&tmp_value2);
- Geometry_buffer buffer1, buffer2;
- Geometry *g1, *g2;
- MBR mbr1, mbr2;
- const char *dummy;
- if ((null_value=
- (args[0]->null_value ||
- args[1]->null_value ||
- !(g1= Geometry::construct(&buffer1, res1->ptr(), res1->length())) ||
- !(g2= Geometry::construct(&buffer2, res2->ptr(), res2->length())) ||
- g1->get_mbr(&mbr1, &dummy) ||
- g2->get_mbr(&mbr2, &dummy))))
- return 0;
- switch (spatial_rel) {
- case SP_CONTAINS_FUNC:
- return mbr1.contains(&mbr2);
- case SP_WITHIN_FUNC:
- return mbr1.within(&mbr2);
- case SP_EQUALS_FUNC:
- return mbr1.equals(&mbr2);
- case SP_DISJOINT_FUNC:
- return mbr1.disjoint(&mbr2);
- case SP_INTERSECTS_FUNC:
- return mbr1.intersects(&mbr2);
- case SP_TOUCHES_FUNC:
- return mbr1.touches(&mbr2);
- case SP_OVERLAPS_FUNC:
- return mbr1.overlaps(&mbr2);
- case SP_CROSSES_FUNC:
- return 0;
- default:
- break;
- }
- null_value=1;
- return 0;
- }
- longlong Item_func_isempty::val_int()
- {
- DBUG_ASSERT(fixed == 1);
- String tmp;
- null_value=0;
- return args[0]->null_value ? 1 : 0;
- }
- longlong Item_func_issimple::val_int()
- {
- DBUG_ASSERT(fixed == 1);
- String tmp;
- String *wkb=args[0]->val_str(&tmp);
- if ((null_value= (!wkb || args[0]->null_value)))
- return 0;
- /* TODO: Ramil or Holyfoot, add real IsSimple calculation */
- return 0;
- }
- longlong Item_func_isclosed::val_int()
- {
- DBUG_ASSERT(fixed == 1);
- String tmp;
- String *swkb= args[0]->val_str(&tmp);
- Geometry_buffer buffer;
- Geometry *geom;
- int isclosed= 0; // In case of error
- null_value= (!swkb ||
- args[0]->null_value ||
- !(geom=
- Geometry::construct(&buffer, swkb->ptr(), swkb->length())) ||
- geom->is_closed(&isclosed));
- return (longlong) isclosed;
- }
- /*
- Numerical functions
- */
- longlong Item_func_dimension::val_int()
- {
- DBUG_ASSERT(fixed == 1);
- uint32 dim= 0; // In case of error
- String *swkb= args[0]->val_str(&value);
- Geometry_buffer buffer;
- Geometry *geom;
- const char *dummy;
- null_value= (!swkb ||
- args[0]->null_value ||
- !(geom= Geometry::construct(&buffer, swkb->ptr(), swkb->length())) ||
- geom->dimension(&dim, &dummy));
- return (longlong) dim;
- }
- longlong Item_func_numinteriorring::val_int()
- {
- DBUG_ASSERT(fixed == 1);
- uint32 num= 0; // In case of error
- String *swkb= args[0]->val_str(&value);
- Geometry_buffer buffer;
- Geometry *geom;
- null_value= (!swkb ||
- !(geom= Geometry::construct(&buffer,
- swkb->ptr(), swkb->length())) ||
- geom->num_interior_ring(&num));
- return (longlong) num;
- }
- longlong Item_func_numgeometries::val_int()
- {
- DBUG_ASSERT(fixed == 1);
- uint32 num= 0; // In case of errors
- String *swkb= args[0]->val_str(&value);
- Geometry_buffer buffer;
- Geometry *geom;
- null_value= (!swkb ||
- !(geom= Geometry::construct(&buffer,
- swkb->ptr(), swkb->length())) ||
- geom->num_geometries(&num));
- return (longlong) num;
- }
- longlong Item_func_numpoints::val_int()
- {
- DBUG_ASSERT(fixed == 1);
- uint32 num= 0; // In case of errors
- String *swkb= args[0]->val_str(&value);
- Geometry_buffer buffer;
- Geometry *geom;
- null_value= (!swkb ||
- args[0]->null_value ||
- !(geom= Geometry::construct(&buffer,
- swkb->ptr(), swkb->length())) ||
- geom->num_points(&num));
- return (longlong) num;
- }
- double Item_func_x::val()
- {
- DBUG_ASSERT(fixed == 1);
- double res= 0.0; // In case of errors
- String *swkb= args[0]->val_str(&value);
- Geometry_buffer buffer;
- Geometry *geom;
- null_value= (!swkb ||
- !(geom= Geometry::construct(&buffer,
- swkb->ptr(), swkb->length())) ||
- geom->get_x(&res));
- return res;
- }
- double Item_func_y::val()
- {
- DBUG_ASSERT(fixed == 1);
- double res= 0; // In case of errors
- String *swkb= args[0]->val_str(&value);
- Geometry_buffer buffer;
- Geometry *geom;
- null_value= (!swkb ||
- !(geom= Geometry::construct(&buffer,
- swkb->ptr(), swkb->length())) ||
- geom->get_y(&res));
- return res;
- }
- double Item_func_area::val()
- {
- DBUG_ASSERT(fixed == 1);
- double res= 0; // In case of errors
- String *swkb= args[0]->val_str(&value);
- Geometry_buffer buffer;
- Geometry *geom;
- const char *dummy;
- null_value= (!swkb ||
- !(geom= Geometry::construct(&buffer,
- swkb->ptr(), swkb->length())) ||
- geom->area(&res, &dummy));
- return res;
- }
- double Item_func_glength::val()
- {
- DBUG_ASSERT(fixed == 1);
- double res= 0; // In case of errors
- String *swkb= args[0]->val_str(&value);
- Geometry_buffer buffer;
- Geometry *geom;
- null_value= (!swkb ||
- !(geom= Geometry::construct(&buffer,
- swkb->ptr(), swkb->length())) ||
- geom->length(&res));
- return res;
- }
- longlong Item_func_srid::val_int()
- {
- DBUG_ASSERT(fixed == 1);
- String *swkb= args[0]->val_str(&value);
- Geometry_buffer buffer;
-
- null_value= (!swkb ||
- !Geometry::construct(&buffer,
- swkb->ptr(), swkb->length()));
- if (null_value)
- return 0;
- return (longlong) (uint4korr(swkb->ptr()));
- }
- #endif /*HAVE_SPATIAL*/