339 lines
9.8 KiB
C++
339 lines
9.8 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2011 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#include "postgis_featureset.hpp"
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#include "resultset.hpp"
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#include "cursorresultset.hpp"
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// mapnik
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#include <mapnik/global.hpp>
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#include <mapnik/debug.hpp>
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#include <mapnik/wkb.hpp>
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#include <mapnik/unicode.hpp>
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#include <mapnik/value_types.hpp>
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#include <mapnik/feature_factory.hpp>
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#include <mapnik/util/conversions.hpp>
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#include <mapnik/util/trim.hpp>
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#include <mapnik/global.hpp> // for int2net
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#include <boost/scoped_array.hpp>
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// boost
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#include <boost/cstdint.hpp> // for boost::int16_t
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// stl
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#include <sstream>
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#include <string>
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using mapnik::geometry_type;
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using mapnik::byte;
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using mapnik::geometry_utils;
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using mapnik::feature_factory;
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using mapnik::context_ptr;
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postgis_featureset::postgis_featureset(boost::shared_ptr<IResultSet> const& rs,
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context_ptr const& ctx,
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std::string const& encoding,
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bool key_field)
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: rs_(rs),
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ctx_(ctx),
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tr_(new transcoder(encoding)),
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totalGeomSize_(0),
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feature_id_(1),
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key_field_(key_field)
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{
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}
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std::string numeric2string(const char* buf);
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feature_ptr postgis_featureset::next()
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{
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while (rs_->next())
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{
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// new feature
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unsigned pos = 1;
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feature_ptr feature;
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if (key_field_)
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{
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std::string name = rs_->getFieldName(pos);
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// null feature id is not acceptable
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if (rs_->isNull(pos))
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{
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MAPNIK_LOG_WARN(postgis) << "postgis_featureset: null value encountered for key_field: " << name;
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continue;
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}
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// create feature with user driven id from attribute
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int oid = rs_->getTypeOID(pos);
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const char* buf = rs_->getValue(pos);
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// validation happens of this type at initialization
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mapnik::value_integer val;
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if (oid == 20)
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{
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val = int8net(buf);
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}
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else if (oid == 21)
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{
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val = int2net(buf);
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}
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else
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{
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val = int4net(buf);
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}
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feature = feature_factory::create(ctx_, val);
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// TODO - extend feature class to know
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// that its id is also an attribute to avoid
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// this duplication
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feature->put<mapnik::value_integer>(name,val);
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++pos;
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}
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else
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{
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// fallback to auto-incrementing id
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feature = feature_factory::create(ctx_, feature_id_);
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++feature_id_;
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}
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if (rs_->isNull(0))
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continue;
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int size = rs_->getFieldLength(0);
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const char *data = rs_->getValue(0);
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// parse geometry
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if (geometry_utils::from_wkb(feature->paths(), data, size))
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continue;
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totalGeomSize_ += size;
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unsigned num_attrs = ctx_->size() + 1;
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for (; pos < num_attrs; ++pos)
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{
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std::string name = rs_->getFieldName(pos);
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// NOTE: we intentionally do not store null here
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// since it is equivalent to the attribute not existing
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if (!rs_->isNull(pos))
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{
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const char* buf = rs_->getValue(pos);
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const int oid = rs_->getTypeOID(pos);
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switch (oid)
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{
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case 16: //bool
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{
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feature->put(name, (buf[0] != 0));
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break;
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}
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case 23: //int4
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{
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feature->put<mapnik::value_integer>(name, int4net(buf));
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break;
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}
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case 21: //int2
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{
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feature->put<mapnik::value_integer>(name, int2net(buf));
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break;
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}
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case 20: //int8/BigInt
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{
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feature->put<mapnik::value_integer>(name, int8net(buf));
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break;
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}
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case 700: //float4
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{
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float val;
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float4net(val, buf);
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feature->put(name, static_cast<double>(val));
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break;
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}
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case 701: //float8
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{
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double val;
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float8net(val, buf);
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feature->put(name, val);
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break;
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}
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case 25: //text
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case 1043: //varchar
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case 705: //literal
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{
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feature->put(name, tr_->transcode(buf));
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break;
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}
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case 1042: //bpchar
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{
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std::string str = mapnik::util::trim_copy(buf);
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feature->put(name, tr_->transcode(str.c_str()));
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break;
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}
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case 1700: //numeric
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{
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double val;
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std::string str = numeric2string(buf);
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if (mapnik::util::string2double(str, val))
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{
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feature->put(name, val);
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}
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break;
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}
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default:
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{
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MAPNIK_LOG_WARN(postgis) << "postgis_featureset: Unknown type_oid=" << oid;
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break;
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}
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}
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}
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}
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return feature;
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}
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return feature_ptr();
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}
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postgis_featureset::~postgis_featureset()
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{
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rs_->close();
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}
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std::string numeric2string(const char* buf)
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{
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boost::int16_t ndigits = int2net(buf);
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boost::int16_t weight = int2net(buf+2);
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boost::int16_t sign = int2net(buf+4);
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boost::int16_t dscale = int2net(buf+6);
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boost::scoped_array<boost::int16_t> digits(new boost::int16_t[ndigits]);
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for (int n=0; n < ndigits ;++n)
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{
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digits[n] = int2net(buf+8+n*2);
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}
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std::ostringstream ss;
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if (sign == 0x4000) ss << "-";
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int i = std::max(weight,boost::int16_t(0));
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int d = 0;
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// Each numeric "digit" is actually a value between 0000 and 9999 stored in a 16 bit field.
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// For example, the number 1234567809990001 is stored as four digits: [1234] [5678] [999] [1].
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// Note that the last two digits show that the leading 0's are lost when the number is split.
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// We must be careful to re-insert these 0's when building the string.
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while ( i >= 0)
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{
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if (i <= weight && d < ndigits)
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{
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// All digits after the first must be padded to make the field 4 characters long
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if (d != 0)
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{
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#ifdef _WINDOWS
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int dig = digits[d];
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if (dig < 10)
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{
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ss << "000"; // 0000 - 0009
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}
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else if (dig < 100)
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{
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ss << "00"; // 0010 - 0099
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}
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else
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{
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ss << "0"; // 0100 - 0999;
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}
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#else
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switch(digits[d])
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{
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case 0 ... 9:
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ss << "000"; // 0000 - 0009
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break;
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case 10 ... 99:
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ss << "00"; // 0010 - 0099
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break;
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case 100 ... 999:
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ss << "0"; // 0100 - 0999
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break;
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}
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#endif
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}
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ss << digits[d++];
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}
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else
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{
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if (d == 0)
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ss << "0";
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else
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ss << "0000";
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}
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i--;
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}
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if (dscale > 0)
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{
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ss << '.';
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// dscale counts the number of decimal digits following the point, not the numeric digits
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while (dscale > 0)
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{
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int value;
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if (i <= weight && d < ndigits)
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value = digits[d++];
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else
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value = 0;
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// Output up to 4 decimal digits for this value
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if (dscale > 0) {
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ss << (value / 1000);
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value %= 1000;
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dscale--;
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}
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if (dscale > 0) {
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ss << (value / 100);
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value %= 100;
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dscale--;
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}
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if (dscale > 0) {
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ss << (value / 10);
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value %= 10;
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dscale--;
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}
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if (dscale > 0) {
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ss << value;
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dscale--;
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}
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i--;
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}
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}
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return ss.str();
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}
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