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/*
* This file is part of rasdaman community.
*
* Rasdaman community 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 3 of the License, or
* (at your option) any later version.
*
* Rasdaman community 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 rasdaman community. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
rasdaman GmbH.
*
* For more information please see <http://www.rasdaman.org>
* or contact Peter Baumann via <baumann@rasdaman.com>.
*/
/*************************************************************
*
*
* PURPOSE:
* Example program for rasql query invocation from C++, showing a
* typical mapping scenario.
*
*
* BUGS:
* - needs this link cmd line
* query2: query2.o
* $(CXX) $(LDFLAGS) -o $@ $^ \
* -L$(RMANHOME)/lib -lrasodmg -lclientcomm -lcompression -lconversion -lraslib -lnetwork -ljpeg -lpng -ltiff -lmfhdf -ldf -lcrypt o -lclientcomm -lm -lz
*
************************************************************/
#include <iostream>
// Linux needs this for template instantiation
#ifdef EARLY_TEMPLATE
#define __EXECUTABLE__
#ifdef __GNUG__
#include "raslib/template_inst.hh"
#endif
#endif
// this file is generated by the rasdl processor
#include "basictypes.hh"
// connectivity constants
char *host = "localhost";
int port = 7001;
char *db = "RASBASE";
char *userName = "rasguest";
char *userPass = "rasguest";
// demo program settings
// - collection ("map") name
char *collection = "rgb";
// - coordinates of map bbox to be retrieved
unsigned int xImageLo = 100;
unsigned int xImageHi = 200;
unsigned int yImageLo = 100;
unsigned int yImageHi = 200;
// - target window size
unsigned int xSize = 10;
unsigned int ySize = 10;
// global connection objects
r_Database database;
r_Transaction transaction;
// sample image accessing function, typical for mapping applications
// input: collection ("map") name, source image coordinates, target window size
// output: ptr to image array
// precondition: we're accessing an RGB image, so that we can select the "green" channel of it
// note: the most important parts contain markups at the beginning of the line
unsigned char *readImage( const char *collection, int xImageLo, int xImageHi, int yImageLo, int yImageHi, int xSize, int ySize ) throw (r_Error)
{
r_Set< r_Ref< r_GMarray > > imageSet; // result set
r_Ref< r_GMarray > image;
r_Iterator< r_Ref< r_GMarray > > iter;
// function result
unsigned char *result = NULL;
try
{
cout << "creating query..." << flush;
// parameters:
// $1 map bbox coordinate, lower x
// $2 map bbox coordinate, upper x
// $3 map bbox coordinate, lower y
// $4 map bbox coordinate, upper y
// $5 result window x size
// $6 result window y size
// $7 collection (i.e., map) name
/* 1 */ r_OQL_Query query("select scale(img.green[$1:$2,$3:$4],[1:$5,1:$6]) from $7 as img");
cout << "substituting parameters ..." << flush;
/* 2 */ query << xImageLo << xImageHi << yImageLo << yImageHi << xSize << ySize << collection;
cout << "[query: " << query.get_query() << "]...";
cout << "executing query..." << flush;
/* 3 */ r_oql_execute( query, imageSet );
// now we assume a result has come back
iter = imageSet.create_iterator();
iter.reset();
/* 4 */ result = (unsigned char*) (*iter)->get_array();
}
catch(r_Error& e)
{
cout << "Error: query failed: " << e.what() << flush;
throw;
}
return result;
}
// simple wrapper, handling db connectivity and demo output
int main()
{
try
{
database.set_servername( host, port );
database.set_useridentification( userName, userPass );
cout << "Opening database " << db << " on " << host << "..." << flush;
database.open( db );
cout << "starting read-only transaction..." << flush;
transaction.begin( r_Transaction::read_only );
// the real workhorse: fetch image data
unsigned char *imgPtr = readImage( collection, xImageLo, xImageHi, yImageLo, yImageHi, xSize, ySize );
cout << "result image:" << endl << hex;
for (int i = 0; i < xSize; i++)
{
for (int j = 0; j < ySize; j++)
{
register unsigned char c = *imgPtr;
cout << " " << setw(2) << (unsigned short) (c & 0xFF);
imgPtr++;
}
cout << endl;
}
cout << dec;
}
catch(r_Error& e)
{
cout << "Error: cannot access database: " << e.what() << endl << flush;
}
// ignore any (previous) errors for connection close
try
{
cout << "aborting transaction..." << flush;
transaction.abort();
cout << "closing database..." << flush;
database.close();
cout << "done." << endl;
}
catch(r_Error &e)
{
cout << "Error closing connection: " << e.what() << endl << flush;
}
return 0;
}
/*
* end of query2.cc
*/
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