mapnik/include/feature_layer_desc.hpp

/*****************************************************************************
 * 
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2006 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

//$Id$

#ifndef FEATURE_LAYER_DESC_HPP
#define FEATURE_LAYER_DESC_HPP

#include <string>
#include <vector>
#include <iostream>

namespace mapnik
{
    
    using std::string;
    using std::vector;
    using std::clog;
    using std::endl;
    
    enum {
	Integer=1,
	Float  =2,
	Double =3,
	String =4,
	Geometry=5,
	Object=6 
    };
    
    class attribute_descriptor
    {
    public:
	attribute_descriptor(string const& name,unsigned type,
		       bool primary_key=false,
		       int size=-1,
		       int precision=-1)
	    : name_(name),
	      type_(type),
	      primary_key_(primary_key),
	      size_(size),
	      precision_(precision) {}
	      
	attribute_descriptor(attribute_descriptor const& other)
	    : name_(other.name_),
	      type_(other.type_),
	      primary_key_(other.primary_key_),
	      size_(other.size_),
	      precision_(other.precision_) {}

	attribute_descriptor& operator=(attribute_descriptor const& other)
	{
	    if (this == &other)
		return *this;	    
	    name_=other.name_;
	    type_=other.type_;
	    primary_key_=other.primary_key_;
	    size_=other.size_;
	    precision_=other.precision_;
	    return *this;
	}
	string const& get_name() const
	{
	    return name_;
	}
	unsigned  get_type() const
	{
	    return type_;
	}
	bool is_primary_key() const
	{
	    return primary_key_;
	}
	int get_size() const
	{
	    return size_;
	} 
	
	int get_precision() const
	{
	    return precision_;
	}
    private:
	string name_;
	int type_;
	bool primary_key_;
	int size_;
	int precision_;
    };
     
    template <typename charT,typename traits>
    inline std::basic_ostream<charT,traits>&
    operator << (std::basic_ostream<charT,traits>& out,
		 attribute_descriptor const& ad)
    {
	out << "name=" << ad.get_name() << endl;
	out << "type=" << ad.get_type() << endl;
	out << "size=" << ad.get_size() << endl;
	return out;
    }

    class layer_descriptor 
    {
    public:
	layer_descriptor(string const& name,int srid=-1)
	    : name_(name),
	      srid_(srid) {}

	layer_descriptor(layer_descriptor const& other)
	    : name_(other.name_),
	      srid_(other.srid_),
	      desc_ar_(other.desc_ar_) {}
	
	void set_name(string const& name)
	{
	    name_=name;
	}
	string const& get_name() const
	{
	    return name_;
	}
	
	void set_srid(int srid) 
	{
	    srid_=srid;
	}
	
	int get_srid() const
	{
	    return srid_;
	}

	void add_descriptor(attribute_descriptor const& desc)
	{
	    desc_ar_.push_back(desc);
	}
	
	vector<attribute_descriptor> const& get_descriptors() const
	{
	    return desc_ar_;
	}	
	vector<attribute_descriptor>& get_descriptors()
	{
	    return desc_ar_;
	}
    private:
	string name_;
	int srid_;
	vector<attribute_descriptor> desc_ar_;
    };
    
    template <typename charT,typename traits>
    inline std::basic_ostream<charT,traits>&
    operator << (std::basic_ostream<charT,traits>& out,
		 layer_descriptor const& ld)
    {
	out << "name=" << ld.get_name() << endl;
	out << "srid=" << ld.get_srid() << endl;
	vector<attribute_descriptor> const& desc_ar=ld.get_descriptors();
	vector<attribute_descriptor>::const_iterator pos=desc_ar.begin();
	while (pos != desc_ar.end())
	{
	    out << *pos++ << endl;
	    
	}
	return out;
    }
    /*    
    bool layer_descriptor_to_wkb(layer_descriptor const& desc,array<>& wkb)
    {
	//srid	
	int srid = desc.get_srid();
	wkb.write(&srid,sizeof(int));

	//attribute descriptors
	vector<attribute_descriptor> const& desc_ar = desc.get_descriptors();
	vector<attribute_descriptor>::const_iterator itr=desc_ar.begin();
	size_t num_desc = desc_ar.size();
	wkb.write(&num_desc,sizeof(int));
	
	while (itr != desc_ar.end())
	{
	    string name = itr->get_name();
	    wkb.write(name.c_str(),name.size()+1);
	       
	    unsigned type = static_cast<int>(itr->get_type());
	    wkb.write(&type,sizeof(unsigned));

	    bool prim_key = itr->is_primary_key();
	    wkb.write(&prim_key,sizeof(bool));

	    int size = itr->get_size();
	    wkb.write(&size,sizeof(int));
            
	    ++itr;
	}	
	return true;
    }
    
    bool layer_descriptor_from_wkb(const char* wkb, layer_descriptor &desc)
    {
	unsigned pos=0;
	int srid;
	
	memcpy(&srid,wkb+pos,sizeof(int));
	desc.set_srid(srid);
	pos+=sizeof(int);
	
	int num_desc;
	memcpy(&num_desc,wkb+pos,sizeof(int));
	pos+=sizeof(int);
	
	for (int i=0;i<num_desc;++i)
	{
	    string name = wkb+pos;
	    pos += name.size()+1;
	    //std::clog<<"name="<<name<<"\n";
	    
	    int type;
	    memcpy(&type,wkb+pos,sizeof(int));
	    pos += sizeof(int);
	    attribute_descriptor ad(name,type);
	    desc.add_descriptor(ad);
	    //todo!!!
	    pos += 4+1;
	}
	return true;
    }
    */    
}

#endif //FEATURE_LAYER_DESC_HPP