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mapjoin.c
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mapjoin.c
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#include "map.h"
// wrapper function for DB specific join functions
int msJoinConnect(layerObj *layer, joinObj *join)
{
switch(join->connectiontype) {
case(MS_DB_XBASE):
return msDBFJoinConnect(layer, join);
break;
default:
break;
}
msSetError(MS_JOINERR, "Unsupported join connection type.", "msJoinConnect()");
return MS_FAILURE;
}
int msJoinPrepare(joinObj *join, shapeObj *shape)
{
switch(join->connectiontype) {
case(MS_DB_XBASE):
return msDBFJoinPrepare(join, shape);
break;
default:
break;
}
msSetError(MS_JOINERR, "Unsupported join connection type.", "msJoinPrepare()");
return MS_FAILURE;
}
int msJoinNext(joinObj *join)
{
switch(join->connectiontype) {
case(MS_DB_XBASE):
return msDBFJoinNext(join);
break;
default:
break;
}
msSetError(MS_JOINERR, "Unsupported join connection type.", "msJoinNext()");
return MS_FAILURE;
}
int msJoinClose(joinObj *join)
{
switch(join->connectiontype) {
case(MS_DB_XBASE):
return msDBFJoinClose(join);
break;
default:
break;
}
msSetError(MS_JOINERR, "Unsupported join connection type.", "msJoinClose()");
return MS_FAILURE;
}
//
// XBASE join functions
//
typedef struct {
DBFHandle hDBF;
int fromindex, toindex;
char *target;
int nextrecord;
} msDBFJoinInfo;
int msDBFJoinConnect(layerObj *layer, joinObj *join)
{
int i;
char szPath[MS_MAXPATHLEN];
msDBFJoinInfo *joininfo;
if(join->joininfo) return(MS_SUCCESS); // already open
// allocate a msDBFJoinInfo struct
joininfo = (msDBFJoinInfo *) malloc(sizeof(msDBFJoinInfo));
if(!joininfo) {
msSetError(MS_MEMERR, "Error allocating XBase table info structure.", "msDBFJoinConnect()");
return(MS_FAILURE);
}
// initialize any members that won't get set later on in this function
joininfo->target = NULL;
joininfo->nextrecord = 0;
join->joininfo = joininfo;
// open the XBase file
if((joininfo->hDBF = msDBFOpen( msBuildPath3(szPath, layer->map->mappath, layer->map->shapepath, join->table), "rb" )) == NULL) {
if((joininfo->hDBF = msDBFOpen( msBuildPath(szPath, layer->map->mappath, join->table), "rb" )) == NULL) {
msSetError(MS_IOERR, "(%s)", "msDBFJoinConnect()", join->table);
return(MS_FAILURE);
}
}
// get "to" item index
if((joininfo->toindex = msDBFGetItemIndex(joininfo->hDBF, join->to)) == -1) {
msSetError(MS_DBFERR, "Item %s not found in table %s.", "msDBFJoinConnect()", join->to, join->table);
return(MS_FAILURE);
}
// get "from" item index
for(i=0; i<layer->numitems; i++) {
if(strcasecmp(layer->items[i],join->from) == 0) { // found it
joininfo->fromindex = i;
break;
}
}
if(i == layer->numitems) {
msSetError(MS_JOINERR, "Item %s not found in layer %s.", "msDBFJoinConnect()", join->from, layer->name);
return(MS_FAILURE);
}
// finally store away the item names in the XBase table
join->numitems = msDBFGetFieldCount(joininfo->hDBF);
join->items = msDBFGetItems(joininfo->hDBF);
if(!join->items) return(MS_FAILURE);
return(MS_SUCCESS);
}
int msDBFJoinPrepare(joinObj *join, shapeObj *shape)
{
msDBFJoinInfo *joininfo = join->joininfo;
if(!joininfo) {
msSetError(MS_JOINERR, "Join connection has not be created.", "msDBFJoinPrepare()");
return(MS_FAILURE);
}
if(!shape) {
msSetError(MS_JOINERR, "Shape to be joined is empty.", "msDBFJoinPrepare()");
return(MS_FAILURE);
}
if(!shape->values) {
msSetError(MS_JOINERR, "Shape to be joined has no attributes.", "msDBFJoinPrepare()");
return(MS_FAILURE);
}
joininfo->nextrecord = 0; // starting with the first record
if(joininfo->target) free(joininfo->target); // clear last target
joininfo->target = strdup(shape->values[joininfo->fromindex]);
return(MS_SUCCESS);
}
int msDBFJoinNext(joinObj *join)
{
int i, n;
msDBFJoinInfo *joininfo = join->joininfo;
if(!joininfo) {
msSetError(MS_JOINERR, "Join connection has not be created.", "msDBFJoinNext()");
return(MS_FAILURE);
}
if(!joininfo->target) {
msSetError(MS_JOINERR, "No target specified, run msDBFJoinPrepare() first.", "msDBFJoinNext()");
return(MS_FAILURE);
}
// clear any old data
if(join->values) {
msFreeCharArray(join->values, join->numitems);
join->values = NULL;
}
n = msDBFGetRecordCount(joininfo->hDBF);
for(i=joininfo->nextrecord; i<n; i++) { // find a match
if(strcmp(joininfo->target, msDBFReadStringAttribute(joininfo->hDBF, i, joininfo->toindex)) == 0) break;
}
if(i == n) { // unable to do the join
if((join->values = (char **)malloc(sizeof(char *)*join->numitems)) == NULL) {
msSetError(MS_MEMERR, NULL, "msDBFJoinTable()");
return(MS_FAILURE);
}
for(i=0; i<join->numitems; i++)
join->values[i] = strdup("\0"); /* intialize to zero length strings */
joininfo->nextrecord = n;
return(MS_DONE);
}
if((join->values = msDBFGetValues(joininfo->hDBF,i)) == NULL)
return(MS_FAILURE);
joininfo->nextrecord = i+1; // so we know where to start looking next time through
return(MS_SUCCESS);
}
int msDBFJoinClose(joinObj *join)
{
msDBFJoinInfo *joininfo = join->joininfo;
if(!joininfo) return(MS_SUCCESS); // already closed
msDBFClose(joininfo->hDBF);
if(joininfo->target) free(joininfo->target);
free(joininfo);
joininfo = NULL;
return(MS_SUCCESS);
}