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Enable metawriter_json to operate on any stream object.

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This commit is contained in:
Hermann Kraus 2010-07-18 23:49:11 +00:00
parent 42891914ab
commit 2c10bb68ef
2 changed files with 23 additions and 15 deletions
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5
include/mapnik/metawriter_json.hpp
View file

@ -28,7 +28,7 @@
#include <mapnik/metawriter.hpp>
// STL
#include <fstream>
#include <ostream>
namespace mapnik {
/** JSON writer. */
@ -36,6 +36,7 @@ class metawriter_json : public metawriter, private boost::noncopyable
{
public:
metawriter_json(metawriter_properties dflt_properties, std::string fn);
metawriter_json(metawriter_properties dflt_properties, std::ostream);
~metawriter_json();
virtual void add_box(box2d<double> box, Feature const &feature,
proj_transform const& prj_trans,
@ -44,7 +45,7 @@ class metawriter_json : public metawriter, private boost::noncopyable
virtual void start();
virtual void stop();
private:
std::fstream f;
std::ostream *f;
std::string fn_;
int count;
};

33
src/metawriter.cpp
View file

@ -32,6 +32,7 @@
// STL
#include <iomanip>
#include <cstdio>
#include <fstream>
namespace mapnik {
@ -48,21 +49,27 @@ metawriter_json::~metawriter_json()
void metawriter_json::start()
{
if (f.is_open())
if (!fn_.empty())
{
std::cerr << "ERROR: GeoJSON metawriter is already active!\n";
if (f)
{
std::cerr << "ERROR: GeoJSON metawriter is already active!\n";
return;
}
f = new std::fstream(fn_.c_str(), std::fstream::out | std::fstream::trunc);
if (f->fail()) perror((std::string("Failed to open file ") + fn_).c_str());
}
f.open(fn_.c_str(), std::fstream::out | std::fstream::trunc);
if (f.fail()) perror((std::string("Failed to open file ") + fn_).c_str());
f << "{ \"type\": \"FeatureCollection\", \"features\": [\n";
assert(f);
*f << "{ \"type\": \"FeatureCollection\", \"features\": [\n";
}
void metawriter_json::stop()
{
if (f.is_open())
if (f) *f << " ] }\n";
if (f && !fn_.empty())
{
f << " ] }\n";
f.close();
dynamic_cast<std::fstream *>(f)->close();
f = 0;
}
}
@ -105,8 +112,8 @@ void metawriter_json::add_box(box2d<double> box, Feature const &feature,
double maxx = box.maxx();
double maxy = box.maxy();
if (count++) f << ",\n";
f << std::fixed << std::setprecision(8) << "{ \"type\": \"Feature\",\n \"geometry\": { \"type\": \"Polygon\",\n \"coordinates\": [ [ [" <<
if (count++) *f << ",\n";
*f << std::fixed << std::setprecision(8) << "{ \"type\": \"Feature\",\n \"geometry\": { \"type\": \"Polygon\",\n \"coordinates\": [ [ [" <<
minx << ", " << miny << "], [" <<
maxx << ", " << miny << "], [" <<
maxx << ", " << maxy << "], [" <<
@ -123,11 +130,11 @@ void metawriter_json::add_box(box2d<double> box, Feature const &feature,
//Property found
text = boost::replace_all_copy(boost::replace_all_copy(itr->second.to_string(), "\\", "\\\\"), "\"", "\\\"");
}
if (i++) f << ",";
f << "\n \"" << p << "\":\"" << text << "\"";
if (i++) *f << ",";
*f << "\n \"" << p << "\":\"" << text << "\"";
}
f << "\n} }";
*f << "\n} }";
}
metawriter_properties::metawriter_properties(boost::optional<std::string> str)