deba@1409: /* -*- C++ -*-
ladanyi@1435:  * lemon/lemon_writer.h - Part of LEMON, a generic C++ optimization library
deba@1409:  *
deba@1409:  * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
deba@1409:  * (Egervary Research Group on Combinatorial Optimization, EGRES).
deba@1409:  *
deba@1409:  * Permission to use, modify and distribute this software is granted
deba@1409:  * provided that this copyright notice appears in all copies. For
deba@1409:  * precise terms see the accompanying LICENSE file.
deba@1409:  *
deba@1409:  * This software is provided "AS IS" with no warranty of any kind,
deba@1409:  * express or implied, and with no claim as to its suitability for any
deba@1409:  * purpose.
deba@1409:  *
deba@1409:  */
deba@1409: 
deba@1409: ///\ingroup io_group
deba@1409: ///\file
deba@1409: ///\brief Lemon Format writer.
deba@1409: 
deba@1409: #ifndef LEMON_LEMON_WRITER_H
deba@1409: #define LEMON_LEMON_WRITER_H
deba@1409: 
deba@1409: #include <iostream>
deba@1409: #include <fstream>
deba@1409: #include <string>
deba@1409: #include <vector>
deba@1409: #include <algorithm>
deba@1409: #include <map>
deba@1409: #include <memory>
deba@1409: 
deba@1409: #include <lemon/error.h>
deba@1409: #include <lemon/invalid.h>
deba@1421: #include <lemon/graph_utils.h>
deba@1409: #include <lemon/bits/item_writer.h>
deba@1421: #include <lemon/utility.h>
deba@1421: #include <lemon/maps.h>
deba@1409: 
deba@1476: #include <lemon/concept_check.h>
deba@1476: #include <lemon/concept/maps.h>
deba@1476: 
deba@1409: 
deba@1409: namespace lemon {
deba@1409: 
deba@1476:   namespace _writer_bits {
deba@1476:     
deba@1476:     template <typename Item>
deba@1476:     class ItemIdWriter {
deba@1476:     public:
deba@1476: 
deba@1476:       bool isIdWriter() { return true; }
deba@1476: 
deba@1476:       void writeId(std::ostream&, const Item&) {}
deba@1476:       
deba@1476:       template <class _ItemIdWriter>
deba@1476:       struct Constraints {
deba@1476: 	void constraints() {
deba@1476: 	  const Item item;
deba@1476: 	  bool b = writer.isIdWriter();
deba@1476: 	  ignore_unused_variable_warning(b);
deba@1476: 	  writer.writeId(os, item);
deba@1476: 	}
deba@1476: 	_ItemIdWriter& writer;
deba@1476: 	std::ostream& os;
deba@1476:       };
deba@1476: 
deba@1476:     };
deba@1476: 
deba@1476:   }
deba@1476: 
deba@1409:   /// \ingroup io_group
deba@1409:   /// \brief Lemon Format writer class.
deba@1409:   /// 
deba@1409:   /// The Lemon Format contains several sections. We do not want to
deba@1409:   /// determine what sections are in a lemon file we give only a framework
deba@1409:   /// to write a section oriented format.
deba@1409:   ///
deba@1409:   /// In the Lemon Format each section starts with a line contains a \c \@
deba@1409:   /// character on the first not white space position. This line is the
deba@1409:   /// header line of the section. Each next lines belong to this section
deba@1409:   /// while it does not starts with \c \@ character. This line can start a 
deba@1409:   /// new section or if it can close the file with the \c \@end line.
deba@1409:   /// The file format ignore the empty lines and it may contain comments
deba@1409:   /// started with a \c # character to the end of the line. 
deba@1409:   ///
deba@1409:   /// The framework provides an abstract LemonWriter::SectionWriter class
deba@1409:   /// what defines the interface of a SectionWriter. The SectionWriter
deba@1409:   /// has the \c header() member function what gives back the header of the
deba@1409:   /// section. After that it will be called the \c write() member which
deba@1409:   /// should write the content of the section.
deba@1409:   ///
deba@1409:   /// \relates GraphWriter
deba@1409:   /// \relates NodeSetWriter
deba@1409:   /// \relates EdgeSetWriter
deba@1409:   /// \relates NodesWriter
deba@1409:   /// \relates EdgesWriter
deba@1409:   /// \relates AttributeWriter
deba@1409:   class LemonWriter {
deba@1409:   public:
deba@1409: 
deba@1409:     /// \brief Abstract base class for writing a section.
deba@1409:     ///
deba@1409:     /// This class has an \c header() member function what gives back
deba@1409:     /// the header line of the section. The \c write() member should
deba@1409:     /// write the content of the section to the stream.
deba@1409:     class SectionWriter {
deba@1409:       friend class LemonWriter;
deba@1409:     protected:
deba@1409:       /// \brief Constructor for SectionWriter.
deba@1409:       ///
deba@1409:       /// Constructor for SectionWriter. It attach this writer to
deba@1409:       /// the given LemonWriter.
deba@1409:       SectionWriter(LemonWriter& writer) {
deba@1409: 	writer.attach(*this);
deba@1409:       }
deba@1409: 
deba@1409:       /// \brief The header of section.
deba@1409:       ///
deba@1409:       /// It gives back the header of the section.
deba@1409:       virtual std::string header() = 0;
deba@1409: 
deba@1409:       /// \brief  Writer function of the section.
deba@1409:       ///
deba@1409:       /// Write the content of the section.
deba@1409:       virtual void write(std::ostream& os) = 0;
deba@1409:     };
deba@1409: 
deba@1409:     /// \brief Constructor for LemonWriter.
deba@1409:     ///
deba@1409:     /// Constructor for LemonWriter which writes to the given stream.
deba@1409:     LemonWriter(std::ostream& _os) 
deba@1409:       : os(&_os), own_os(false) {}
deba@1409: 
deba@1409:     /// \brief Constructor for LemonWriter.
deba@1409:     ///
deba@1409:     /// Constructor for LemonWriter which writes to the given file.
deba@1409:     LemonWriter(const std::string& filename) 
deba@1409:       : os(0), own_os(true) {
deba@1409:       os = new std::ofstream(filename.c_str());
deba@1409:     }
deba@1409: 
deba@1409:     /// \brief Desctructor for LemonWriter.
deba@1409:     ///
deba@1409:     /// Desctructor for LemonWriter.
deba@1409:     ~LemonWriter() {
deba@1409:       if (own_os) {
deba@1409: 	delete os;
deba@1409:       }
deba@1409:     }
deba@1409: 
deba@1409:   private:
deba@1409:     LemonWriter(const LemonWriter&);
deba@1409:     void operator=(const LemonWriter&);
deba@1409: 
deba@1409:     void attach(SectionWriter& writer) {
deba@1409:       writers.push_back(&writer);
deba@1409:     }
deba@1409: 
deba@1409:   public:
deba@1409: 
deba@1409:     /// \brief Executes the LemonWriter.
deba@1409:     /// 
deba@1409:     /// It executes the LemonWriter.
deba@1409:     void run() {
deba@1409:       SectionWriters::iterator it;
deba@1409:       for (it = writers.begin(); it != writers.end(); ++it) {
deba@1409: 	*os << (*it)->header() << std::endl;
deba@1409: 	(*it)->write(*os);
deba@1409:       }
deba@1409:       *os << "@end" << std::endl;
deba@1409:     }
deba@1409: 
deba@1409: 
deba@1409:   private:
deba@1409: 
deba@1409:     std::ostream* os;
deba@1409:     bool own_os;
deba@1409: 
deba@1409:     typedef std::vector<SectionWriter*> SectionWriters;
deba@1409:     SectionWriters writers;
deba@1409: 
deba@1409:   };
deba@1409: 
deba@1409:   /// \brief Helper class for implementing the common SectionWriters.
deba@1409:   ///
deba@1409:   /// Helper class for implementing the common SectionWriters.
deba@1409:   class CommonSectionWriterBase : public LemonWriter::SectionWriter {
deba@1409:     typedef LemonWriter::SectionWriter Parent;
deba@1409:   protected:
deba@1409:     
deba@1409:     /// \brief Constructor for CommonSectionWriterBase.
deba@1409:     ///
deba@1409:     /// Constructor for CommonSectionWriterBase. It attach this writer to
deba@1409:     /// the given LemonWriter.
deba@1409:     CommonSectionWriterBase(LemonWriter& _writer) 
deba@1409:       : Parent(_writer) {}
deba@1409: 
deba@1409:     template <typename _Item>    
deba@1409:     class WriterBase {
deba@1409:     public:
deba@1409:       typedef _Item Item;
deba@1409: 
deba@1409:       virtual ~WriterBase() {}
deba@1409: 
deba@1409:       virtual void write(std::ostream& os, const Item& item) = 0;
deba@1409:     };
deba@1409: 
deba@1409: 
deba@1409:     template <typename _Item, typename _Map, typename _Writer>
deba@1409:     class MapWriter : public WriterBase<_Item> {
deba@1409:     public:
deba@1409:       typedef _Map Map;
deba@1409:       typedef _Writer Writer;
deba@1409:       typedef typename Writer::Value Value;
deba@1409:       typedef _Item Item;
deba@1409:       
deba@1421:       typename SmartConstReference<Map>::Type map;
deba@1409:       Writer writer;
deba@1409: 
deba@1409:       MapWriter(const Map& _map, const Writer& _writer) 
deba@1409: 	: map(_map), writer(_writer) {}
deba@1409: 
deba@1409:       virtual ~MapWriter() {}
deba@1409: 
deba@1409:       virtual void write(std::ostream& os, const Item& item) {
deba@1409: 	Value value = map[item];
deba@1409: 	writer.write(os, value);
deba@1409:       }
deba@1409: 
deba@1409:     };
deba@1409: 
deba@1409: 
deba@1409:     class ValueWriterBase {
deba@1409:     public:
deba@1409:       virtual void write(std::ostream&) = 0;
deba@1409:     };
deba@1409: 
deba@1409:     template <typename _Value, typename _Writer>
deba@1409:     class ValueWriter : public ValueWriterBase {
deba@1409:     public:
deba@1409:       typedef _Value Value;
deba@1409:       typedef _Writer Writer;
deba@1409: 
deba@1409:       ValueWriter(const Value& _value, const Writer& _writer)
deba@1409:  	: value(_value), writer(_writer) {}
deba@1409: 
deba@1409:       virtual void write(std::ostream& os) {
deba@1411: 	writer.write(os, value);
deba@1409:       }
deba@1409:     private:
deba@1409:       const Value& value;
deba@1409:       Writer writer;
deba@1409:     };
deba@1409:     
deba@1409: 
deba@1409:     template <typename _Item>
deba@1409:     class IdWriterBase {
deba@1409:     public:
deba@1409:       typedef _Item Item;
deba@1409:       virtual void write(std::ostream&, const Item&) const = 0;
deba@1476:       virtual bool isIdWriter() const = 0;
deba@1409:     };
deba@1409: 
deba@1409:     template <typename _Item, typename _BoxedIdWriter>
deba@1409:     class IdWriter : public IdWriterBase<_Item> {
deba@1409:     public:
deba@1409:       typedef _Item Item;
deba@1409:       typedef _BoxedIdWriter BoxedIdWriter;
deba@1409: 
deba@1409:       const BoxedIdWriter& idWriter;
deba@1409: 
deba@1409:       IdWriter(const BoxedIdWriter& _idWriter) 
deba@1409: 	: idWriter(_idWriter) {}
deba@1409: 
deba@1409:       virtual void write(std::ostream& os, const Item& item) const {
deba@1429: 	idWriter.writeId(os, item);
deba@1409:       }
deba@1476: 
deba@1476:       virtual bool isIdWriter() const {
deba@1476: 	return idWriter.isIdWriter();
deba@1476:       }
deba@1409:     };
deba@1409:   };
deba@1409: 
deba@1409:   /// \ingroup io_group
deba@1409:   /// \brief SectionWriter for writing a graph's nodeset.
deba@1409:   ///
deba@1409:   /// The lemon format can store multiple graph nodesets with several maps.
deba@1409:   /// The nodeset section's header line is \c \@nodeset \c nodeset_id, but the
deba@1409:   /// \c nodeset_id may be empty.
deba@1409:   ///
deba@1409:   /// The first line of the section contains the names of the maps separated
deba@1409:   /// with white spaces. Each next lines describes a node in the nodeset, and
deba@1409:   /// contains the mapped values for each map.
deba@1409:   ///
deba@1409:   /// If the nodeset contains an \c "id" named map then it will be regarded
deba@1409:   /// as id map. This map should contain only unique values and when the 
deba@1409:   /// \c writeId() member will be called with a node it will write it's id.
deba@1409:   /// Otherwise if the \c _forceIdMap constructor parameter is true then
deba@1409:   /// the id map will be the id in the graph.
deba@1409:   ///
deba@1409:   /// \relates LemonWriter
deba@1409:   template <typename _Graph, typename _Traits = DefaultWriterTraits>
deba@1409:   class NodeSetWriter : public CommonSectionWriterBase {
deba@1409:     typedef CommonSectionWriterBase Parent;
deba@1409:   public:
deba@1409: 
deba@1409:     typedef _Graph Graph;
deba@1409:     typedef _Traits Traits;
deba@1429:     typedef typename Graph::Node Node;
deba@1409: 
deba@1409:     /// \brief Constructor.
deba@1409:     ///
deba@1409:     /// Constructor for NodeSetWriter. It creates the NodeSetWriter and
deba@1409:     /// attach it into the given LemonWriter. If the \c _forceIdMap
deba@1409:     /// parameter is true then the writer will write own id map when
deba@1409:     /// the user does not give "id" named map.
deba@1409:     NodeSetWriter(LemonWriter& _writer, const Graph& _graph, 
deba@1409: 		  const std::string& _id = std::string(), 
deba@1409: 		  bool _forceIdMap = true) 
deba@1409:       : Parent(_writer), idMap(0), forceIdMap(_forceIdMap), 
deba@1409: 	graph(_graph), id(_id) {}
deba@1409: 
deba@1409:     /// \brief Destructor.
deba@1409:     ///
deba@1409:     /// Destructor for NodeSetWriter.
deba@1409:     virtual ~NodeSetWriter() {
deba@1409:       typename MapWriters::iterator it;
deba@1409:       for (it = writers.begin(); it != writers.end(); ++it) {
deba@1409: 	delete it->second;
deba@1409:       }
deba@1409:     }
deba@1409: 
deba@1409:   private:
deba@1409:     NodeSetWriter(const NodeSetWriter&);
deba@1409:     void operator=(const NodeSetWriter&);
deba@1409:   
deba@1409:   public:
deba@1409: 
deba@1409:     /// \brief Add a new node map writer command for the writer.
deba@1409:     ///
deba@1409:     /// Add a new node map writer command for the writer.
deba@1409:     template <typename Map>
deba@1421:     NodeSetWriter& writeNodeMap(std::string name, const Map& map) {
deba@1421:       return writeNodeMap<typename Traits::
deba@1409: 	template Writer<typename Map::Value>, Map>(name, map);
deba@1409:     }
deba@1409: 
deba@1409:     /// \brief Add a new node map writer command for the writer.
deba@1409:     ///
deba@1409:     /// Add a new node map writer command for the writer.
deba@1409:     template <typename Writer, typename Map>
deba@1421:     NodeSetWriter& writeNodeMap(std::string name, const Map& map, 
deba@1421: 			    const Writer& writer = Writer()) {
deba@1476:       checkConcept<concept::WriteMap<Node, typename Map::Value>, Map>();
deba@1409:       writers.push_back(
deba@1429: 	make_pair(name, new MapWriter<Node, Map, Writer>(map, writer)));
deba@1409:       return *this;
deba@1409:     }
deba@1409: 
deba@1409:   protected:
deba@1409: 
deba@1409:     /// \brief The header of the section.
deba@1409:     ///
deba@1409:     /// It gives back the header of the section.
deba@1409:     virtual std::string header() {
deba@1409:       return "@nodeset " + id;
deba@1409:     }
deba@1409: 
deba@1409:     /// \brief  Writer function of the section.
deba@1409:     ///
deba@1409:     /// Write the content of the section.
deba@1409:     virtual void write(std::ostream& os) {
deba@1409:       for (int i = 0; i < (int)writers.size(); ++i) {
deba@1409: 	if (writers[i].first == "id") {
deba@1409: 	  idMap = writers[i].second;
deba@1409: 	  forceIdMap = false;
deba@1409: 	  break;
deba@1409: 	}
deba@1409:       }
deba@1409:       if (forceIdMap) {
deba@1409: 	os << "id\t";
deba@1409:       }
deba@1409:       for (int i = 0; i < (int)writers.size(); ++i) {
deba@1409: 	os << writers[i].first << '\t';
deba@1409:       }
deba@1409:       os << std::endl;
deba@1409:       for (typename Graph::NodeIt it(graph); it != INVALID; ++it) {
deba@1409: 	if (forceIdMap) {
deba@1409: 	  os << graph.id(it) << '\t';
deba@1409: 	}
deba@1409: 	for (int i = 0; i < (int)writers.size(); ++i) {
deba@1409: 	  writers[i].second->write(os, it);
deba@1409: 	  os << '\t';
deba@1409: 	}
deba@1409: 	os << std::endl;
deba@1409:       }
deba@1409:     }
deba@1409: 
deba@1409:   public:
deba@1409: 
deba@1409:     /// \brief Returns true if the nodeset can write the ids of the nodes.
deba@1409:     ///
deba@1409:     /// Returns true if the nodeset can write the ids of the nodes.
deba@1409:     /// It is possible only if an "id" named map was written or the 
deba@1409:     /// \c _forceIdMap constructor parameter was true.
deba@1409:     bool isIdWriter() const {
deba@1409:       return idMap != 0 || forceIdMap;
deba@1409:     }
deba@1409: 
deba@1409:     /// \brief Write the id of the given node.
deba@1409:     ///
deba@1409:     /// It writes the id of the given node. If there was written an "id"
deba@1409:     /// named map then it will write the map value belongs to the node.
deba@1409:     /// Otherwise if the \c forceId parameter was true it will write
deba@1409:     /// its id in the graph. 
deba@1429:     void writeId(std::ostream& os, const Node& item) const {
deba@1409:       if (forceIdMap) {
deba@1409: 	os << graph.id(item);
deba@1409:       } else {
deba@1409: 	idMap->write(os, item);
deba@1409:       }
deba@1409:     }
deba@1409: 
deba@1409:   private:
deba@1409: 
deba@1429:     typedef std::vector<std::pair<std::string, WriterBase<Node>*> > MapWriters;
deba@1409:     MapWriters writers;
deba@1409: 
deba@1429:     WriterBase<Node>* idMap;
deba@1409:     bool forceIdMap;
deba@1409:    
deba@1421:     typename SmartConstReference<Graph>::Type graph;   
deba@1409:     std::string id;
deba@1409: 
deba@1409:   };
deba@1409: 
deba@1409:   /// \ingroup io_group
deba@1421:   /// \brief SectionWriter for writing a graph's edgesets.
deba@1409:   ///
deba@1421:   /// The lemon format can store multiple graph edgesets with several maps. 
deba@1409:   /// The edgeset section's header line is \c \@edgeset \c edgeset_id, but the
deba@1409:   /// \c edgeset_id may be empty.
deba@1409:   ///
deba@1409:   /// The first line of the section contains the names of the maps separated
deba@1409:   /// with white spaces. Each next lines describes a edge in the edgeset. The
deba@1409:   /// line contains the source and the target nodes' id and the mapped 
deba@1409:   /// values for each map.
deba@1409:   ///
deba@1409:   /// If the edgeset contains an \c "id" named map then it will be regarded
deba@1409:   /// as id map. This map should contain only unique values and when the 
deba@1421:   /// \c writeId() member will be called with an edge it will write it's id.
deba@1409:   /// Otherwise if the \c _forceIdMap constructor parameter is true then
deba@1409:   /// the id map will be the id in the graph.
deba@1409:   ///
deba@1409:   /// The edgeset writer needs a node id writer to identify which nodes
deba@1409:   /// have to be connected. If a NodeSetWriter can write the nodes' id,
deba@1409:   /// it will be able to use with this class.
deba@1409:   ///
deba@1409:   /// \relates LemonWriter
deba@1409:   template <typename _Graph, typename _Traits = DefaultWriterTraits>
deba@1409:   class EdgeSetWriter : public CommonSectionWriterBase {
deba@1409:     typedef CommonSectionWriterBase Parent;
deba@1409:   public:
deba@1409: 
deba@1409:     typedef _Graph Graph;
deba@1409:     typedef _Traits Traits;
deba@1429:     typedef typename Graph::Node Node;
deba@1429:     typedef typename Graph::Edge Edge;
deba@1409: 
deba@1409:     /// \brief Constructor.
deba@1409:     ///
deba@1409:     /// Constructor for EdgeSetWriter. It creates the EdgeSetWriter and
deba@1409:     /// attach it into the given LemonWriter. It will write node ids by
deba@1409:     /// the \c _nodeIdWriter. If the \c _forceIdMap parameter is true 
deba@1421:     /// then the writer will write own id map if the user does not give 
deba@1409:     /// "id" named map.
deba@1409:     template <typename NodeIdWriter>
deba@1409:     EdgeSetWriter(LemonWriter& _writer, const Graph& _graph, 
deba@1409: 		  const NodeIdWriter& _nodeIdWriter, 
deba@1409: 		  const std::string& _id = std::string(),
deba@1409: 		  bool _forceIdMap = true)
deba@1409:       : Parent(_writer), idMap(0), forceIdMap(_forceIdMap),
deba@1476: 	graph(_graph), id(_id) {
deba@1476:       checkConcept<_writer_bits::ItemIdWriter<Node>, NodeIdWriter>();
deba@1476:       nodeIdWriter.reset(new IdWriter<Node, NodeIdWriter>(_nodeIdWriter));
deba@1476:     } 
deba@1409: 
deba@1409:     /// \brief Destructor.
deba@1409:     ///
deba@1409:     /// Destructor for EdgeSetWriter.
deba@1409:     virtual ~EdgeSetWriter() {
deba@1409:       typename MapWriters::iterator it;
deba@1409:       for (it = writers.begin(); it != writers.end(); ++it) {
deba@1409: 	delete it->second;
deba@1409:       }
deba@1409:     }
deba@1409: 
deba@1409:   private:
deba@1409:     EdgeSetWriter(const EdgeSetWriter&);
deba@1409:     void operator=(const EdgeSetWriter&);
deba@1409: 
deba@1409:   public:
deba@1409: 
deba@1421:     /// \brief Add a new edge map writer command for the writer.
deba@1409:     ///
deba@1421:     /// Add a new edge map writer command for the writer.
deba@1409:     template <typename Map>
deba@1421:     EdgeSetWriter& writeEdgeMap(std::string name, const Map& map) {
deba@1421:       return writeEdgeMap<typename Traits::
deba@1409: 	template Writer<typename Map::Value>, Map>(name, map);
deba@1409:     }
deba@1409: 
deba@1421:     /// \brief Add a new edge map writer command for the writer.
deba@1409:     ///
deba@1421:     /// Add a new edge map writer command for the writer.
deba@1409:     template <typename Writer, typename Map>
deba@1421:     EdgeSetWriter& writeEdgeMap(std::string name, const Map& map, 
deba@1421: 			    const Writer& writer = Writer()) {
deba@1476:       checkConcept<concept::WriteMap<Edge, typename Map::Value>, Map>();
deba@1409:       writers.push_back(
deba@1429: 	make_pair(name, new MapWriter<Edge, Map, Writer>(map, writer)));
deba@1409:       return *this;
deba@1409:     }
deba@1409: 
deba@1409:   protected:
deba@1409: 
deba@1409:     /// \brief The header of the section.
deba@1409:     ///
deba@1409:     /// It gives back the header of the section.
deba@1409:     virtual std::string header() {
deba@1409:       return "@edgeset " + id;
deba@1409:     }
deba@1409: 
deba@1409:     /// \brief  Writer function of the section.
deba@1409:     ///
deba@1409:     /// Write the content of the section.
deba@1409:     virtual void write(std::ostream& os) {
deba@1476:       if (!nodeIdWriter->isIdWriter()) {
deba@1476: 	throw DataFormatError("Cannot find nodeset or ID map");
deba@1476:       }
deba@1409:       for (int i = 0; i < (int)writers.size(); ++i) {
deba@1409: 	if (writers[i].first == "id") {
deba@1409: 	  idMap = writers[i].second;
deba@1409: 	  forceIdMap = false;
deba@1409: 	  break;
deba@1409: 	}
deba@1409:       }
deba@1409:       os << "\t\t";
deba@1409:       if (forceIdMap) {
deba@1409: 	os << "id\t";
deba@1409:       }
deba@1409:       for (int i = 0; i < (int)writers.size(); ++i) {
deba@1409: 	os << writers[i].first << '\t';
deba@1409:       }
deba@1409:       os << std::endl;
deba@1409:       for (typename Graph::EdgeIt it(graph); it != INVALID; ++it) {
deba@1409: 	nodeIdWriter->write(os, graph.source(it));
deba@1409: 	os << '\t';
deba@1409: 	nodeIdWriter->write(os, graph.target(it));
deba@1409: 	os << '\t';
deba@1409: 	if (forceIdMap) {
deba@1409: 	  os << graph.id(it) << '\t';
deba@1409: 	}
deba@1409: 	for (int i = 0; i < (int)writers.size(); ++i) {
deba@1409: 	  writers[i].second->write(os, it);
deba@1409: 	  os << '\t';
deba@1409: 	}
deba@1409: 	os << std::endl;
deba@1409:       }
deba@1409:     }
deba@1409: 
deba@1409:   public:
deba@1409: 
deba@1409:     /// \brief Returns true if the edgeset can write the ids of the edges.
deba@1409:     ///
deba@1409:     /// Returns true if the edgeset can write the ids of the edges.
deba@1409:     /// It is possible only if an "id" named map was written or the 
deba@1409:     /// \c _forceIdMap constructor parameter was true.
deba@1409:     bool isIdWriter() const {
deba@1409:       return forceIdMap || idMap != 0;
deba@1409:     }
deba@1409: 
deba@1409:     /// \brief Write the id of the given edge.
deba@1409:     ///
deba@1409:     /// It writes the id of the given edge. If there was written an "id"
deba@1409:     /// named map then it will write the map value belongs to the edge.
deba@1409:     /// Otherwise if the \c forceId parameter was true it will write
deba@1409:     /// its id in the graph. 
deba@1429:     void writeId(std::ostream& os, const Edge& item) const {
deba@1409:       if (forceIdMap) {
deba@1409: 	os << graph.id(item);
deba@1409:       } else {
deba@1409: 	idMap->write(os, item);
deba@1409:       }
deba@1409:     } 
deba@1409: 
deba@1409:   private:
deba@1409: 
deba@1429:     typedef std::vector<std::pair<std::string, WriterBase<Edge>*> > MapWriters;
deba@1409:     MapWriters writers;
deba@1409: 
deba@1429:     WriterBase<Edge>* idMap;
deba@1409:     bool forceIdMap;
deba@1409:    
deba@1421:     typename SmartConstReference<Graph>::Type graph;   
deba@1421:     std::string id;
deba@1421: 
deba@1429:     std::auto_ptr<IdWriterBase<Node> > nodeIdWriter;
deba@1421:   };
deba@1421: 
deba@1421:   /// \ingroup io_group
deba@1421:   /// \brief SectionWriter for writing a undirected edgeset.
deba@1421:   ///
deba@1421:   /// The lemon format can store multiple undirected edgesets with several 
deba@1421:   /// maps. The undirected edgeset section's header line is \c \@undiredgeset 
deba@1421:   /// \c undiredgeset_id, but the \c undiredgeset_id may be empty.
deba@1421:   ///
deba@1421:   /// The first line of the section contains the names of the maps separated
deba@1421:   /// with white spaces. Each next lines describes an undirected edge in the 
deba@1421:   /// edgeset. The line contains the two connected nodes' id and the mapped 
deba@1421:   /// values for each undirected map.
deba@1421:   ///
deba@1421:   /// The section can handle the directed as a syntactical sugar. Two
deba@1421:   /// undirected edge map describes one directed edge map. This two maps
deba@1421:   /// are the forward map and the backward map and the names of this map
deba@1421:   /// is near the same just with a prefix \c '+' or \c '-' character 
deba@1421:   /// difference.
deba@1421:   ///
deba@1421:   /// If the edgeset contains an \c "id" named map then it will be regarded
deba@1421:   /// as id map. This map should contain only unique values and when the 
deba@1421:   /// \c writeId() member will be called with an undirected edge it will 
deba@1421:   /// write it's id. Otherwise if the \c _forceIdMap constructor parameter
deba@1421:   /// is true then the id map will be the id in the graph.
deba@1421:   ///
deba@1421:   /// The undirected edgeset writer needs a node id writer to identify 
deba@1421:   /// which nodes have to be connected. If a NodeSetWriter can write the 
deba@1421:   /// nodes' id, it will be able to use with this class.
deba@1421:   ///
deba@1421:   /// \relates LemonWriter
deba@1421:   template <typename _Graph, typename _Traits = DefaultWriterTraits>
deba@1421:   class UndirEdgeSetWriter : public CommonSectionWriterBase {
deba@1421:     typedef CommonSectionWriterBase Parent;
deba@1421:   public:
deba@1421: 
deba@1421:     typedef _Graph Graph;
deba@1421:     typedef _Traits Traits;
deba@1429:     typedef typename Graph::Node Node;
deba@1429:     typedef typename Graph::Edge Edge;
deba@1429:     typedef typename Graph::UndirEdge UndirEdge;
deba@1421: 
deba@1421:     /// \brief Constructor.
deba@1421:     ///
deba@1421:     /// Constructor for UndirEdgeSetWriter. It creates the UndirEdgeSetWriter
deba@1421:     /// and attach it into the given LemonWriter. It will write node ids by
deba@1421:     /// the \c _nodeIdWriter. If the \c _forceIdMap parameter is true 
deba@1421:     /// then the writer will write own id map if the user does not give 
deba@1421:     /// "id" named map.
deba@1421:     template <typename NodeIdWriter>
deba@1421:     UndirEdgeSetWriter(LemonWriter& _writer, const Graph& _graph, 
deba@1421: 		       const NodeIdWriter& _nodeIdWriter, 
deba@1421: 		       const std::string& _id = std::string(),
deba@1421: 		       bool _forceIdMap = true)
deba@1421:       : Parent(_writer), idMap(0), forceIdMap(_forceIdMap),
deba@1476: 	graph(_graph), id(_id) {
deba@1476:       checkConcept<_writer_bits::ItemIdWriter<Node>, NodeIdWriter>();
deba@1476:       nodeIdWriter.reset(new IdWriter<Node, NodeIdWriter>(_nodeIdWriter));
deba@1476:     } 
deba@1421: 
deba@1421:     /// \brief Destructor.
deba@1421:     ///
deba@1421:     /// Destructor for UndirEdgeSetWriter.
deba@1421:     virtual ~UndirEdgeSetWriter() {
deba@1421:       typename MapWriters::iterator it;
deba@1421:       for (it = writers.begin(); it != writers.end(); ++it) {
deba@1421: 	delete it->second;
deba@1421:       }
deba@1421:     }
deba@1421: 
deba@1421:   private:
deba@1421:     UndirEdgeSetWriter(const UndirEdgeSetWriter&);
deba@1421:     void operator=(const UndirEdgeSetWriter&);
deba@1421: 
deba@1421:   public:
deba@1421: 
deba@1421:     /// \brief Add a new undirected edge map writer command for the writer.
deba@1421:     ///
deba@1421:     /// Add a new undirected map writer command for the writer.
deba@1421:     template <typename Map>
deba@1421:     UndirEdgeSetWriter& writeUndirEdgeMap(std::string name, const Map& map) {
deba@1421:       return writeUndirEdgeMap<typename Traits::
deba@1421: 	template Writer<typename Map::Value>, Map>(name, map);
deba@1421:     }
deba@1421: 
deba@1421:     /// \brief Add a new undirected map writer command for the writer.
deba@1421:     ///
deba@1421:     /// Add a new undirected map writer command for the writer.
deba@1421:     template <typename Writer, typename Map>
deba@1421:     UndirEdgeSetWriter& writeUndirEdgeMap(std::string name, const Map& map, 
deba@1421: 					  const Writer& writer = Writer()) {
deba@1476:       checkConcept<concept::WriteMap<UndirEdge, typename Map::Value>, Map>();
deba@1421:       writers.push_back(
deba@1429: 	make_pair(name, new MapWriter<UndirEdge, Map, Writer>(map, writer)));
deba@1421:       return *this;
deba@1421:     }
deba@1421: 
deba@1421:     /// \brief Add a new directed edge map writer command for the writer.
deba@1421:     ///
deba@1421:     /// Add a new directed map writer command for the writer.
deba@1421:     template <typename Map>
deba@1421:     UndirEdgeSetWriter& writeEdgeMap(std::string name, const Map& map) {
deba@1476:       checkConcept<concept::WriteMap<Edge, typename Map::Value>, Map>();
deba@1421:       writeUndirEdgeMap("+" + name, composeMap(forwardMap(graph), map));
deba@1421:       writeUndirEdgeMap("-" + name, composeMap(backwardMap(graph), map));
deba@1421:       return *this;
deba@1421:     }
deba@1421: 
deba@1421:     /// \brief Add a new directed map writer command for the writer.
deba@1421:     ///
deba@1421:     /// Add a new directed map writer command for the writer.
deba@1421:     template <typename Writer, typename Map>
deba@1421:     UndirEdgeSetWriter& writeEdgeMap(std::string name, const Map& map, 
deba@1421: 				     const Writer& writer = Writer()) {
deba@1476:       checkConcept<concept::WriteMap<Edge, typename Map::Value>, Map>();
deba@1421:       writeUndirEdge("+" + name, composeMap(forwardMap(graph), map), writer);
deba@1476:       writeUndirEdge("-" + name, composeMap(backwardMap(graph), map), writer);
deba@1421:       return *this;
deba@1421:     }
deba@1421: 
deba@1421:   protected:
deba@1421: 
deba@1421:     /// \brief The header of the section.
deba@1421:     ///
deba@1421:     /// It gives back the header of the section.
deba@1421:     virtual std::string header() {
deba@1421:       return "@undiredgeset " + id;
deba@1421:     }
deba@1421: 
deba@1421:     /// \brief  Writer function of the section.
deba@1421:     ///
deba@1421:     /// Write the content of the section.
deba@1421:     virtual void write(std::ostream& os) {
deba@1476:       if (!nodeIdWriter->isIdWriter()) {
deba@1476: 	throw DataFormatError("Cannot find nodeset or ID map");
deba@1476:       }
deba@1421:       for (int i = 0; i < (int)writers.size(); ++i) {
deba@1421: 	if (writers[i].first == "id") {
deba@1421: 	  idMap = writers[i].second;
deba@1421: 	  forceIdMap = false;
deba@1421: 	  break;
deba@1421: 	}
deba@1421:       }
deba@1421:       os << "\t\t";
deba@1421:       if (forceIdMap) {
deba@1421: 	os << "id\t";
deba@1421:       }
deba@1421:       for (int i = 0; i < (int)writers.size(); ++i) {
deba@1421: 	os << writers[i].first << '\t';
deba@1421:       }
deba@1421:       os << std::endl;
deba@1421:       for (typename Graph::UndirEdgeIt it(graph); it != INVALID; ++it) {
deba@1421: 	nodeIdWriter->write(os, graph.source(it));
deba@1421: 	os << '\t';
deba@1421: 	nodeIdWriter->write(os, graph.target(it));
deba@1421: 	os << '\t';
deba@1421: 	if (forceIdMap) {
deba@1421: 	  os << graph.id(it) << '\t';
deba@1421: 	}
deba@1421: 	for (int i = 0; i < (int)writers.size(); ++i) {
deba@1421: 	  writers[i].second->write(os, it);
deba@1421: 	  os << '\t';
deba@1421: 	}
deba@1421: 	os << std::endl;
deba@1421:       }
deba@1421:     }
deba@1421: 
deba@1421:   public:
deba@1421: 
deba@1421:     /// \brief Returns true if the undirected edgeset can write the ids of 
deba@1421:     /// the edges.
deba@1421:     ///
deba@1421:     /// Returns true if the undirected edgeset can write the ids of the 
deba@1421:     /// undirected edges. It is possible only if an "id" named map was 
deba@1421:     /// written or the \c _forceIdMap constructor parameter was true.
deba@1421:     bool isIdWriter() const {
deba@1421:       return forceIdMap || idMap != 0;
deba@1421:     }
deba@1421: 
deba@1421:     /// \brief Write the id of the given undirected edge.
deba@1421:     ///
deba@1421:     /// It writes the id of the given undirected edge. If there was written 
deba@1421:     /// an "id" named map then it will write the map value belongs to the 
deba@1421:     /// undirected edge. Otherwise if the \c forceId parameter was true it 
deba@1421:     /// will write its id in the graph. 
deba@1429:     void writeId(std::ostream& os, const UndirEdge& item) const {
deba@1429:       if (forceIdMap) {
deba@1429: 	os << graph.id(item);
deba@1429:       } else {
deba@1429: 	idMap->write(os, item);
deba@1429:       }
deba@1429:     } 
deba@1429: 
deba@1429:     /// \brief Write the id of the given edge.
deba@1429:     ///
deba@1429:     /// It writes the id of the given edge. If there was written 
deba@1429:     /// an "id" named map then it will write the map value belongs to the 
deba@1429:     /// edge. Otherwise if the \c forceId parameter was true it 
deba@1429:     /// will write its id in the graph. If the edge is forward map
deba@1429:     /// then its prefix character is \c '+' elsewhere \c '-'.
deba@1429:     void writeId(std::ostream& os, const Edge& item) const {
deba@1429:       if (graph.forward(item)) {
deba@1429: 	os << "+ ";
deba@1429:       } else {
deba@1429: 	os << "- ";
deba@1429:       }
deba@1421:       if (forceIdMap) {
deba@1421: 	os << graph.id(item);
deba@1421:       } else {
deba@1421: 	idMap->write(os, item);
deba@1421:       }
deba@1421:     } 
deba@1421: 
deba@1421:   private:
deba@1421: 
deba@1429:     typedef std::vector<std::pair<std::string, 
deba@1429: 				  WriterBase<UndirEdge>*> > MapWriters;
deba@1421:     MapWriters writers;
deba@1421: 
deba@1429:     WriterBase<UndirEdge>* idMap;
deba@1421:     bool forceIdMap;
deba@1421:    
deba@1421:     typename SmartConstReference<Graph>::Type graph;   
deba@1409:     std::string id;
deba@1409: 
deba@1429:     std::auto_ptr<IdWriterBase<Node> > nodeIdWriter;
deba@1409:   };
deba@1409: 
deba@1409:   /// \ingroup io_group
deba@1409:   /// \brief SectionWriter for writing labeled nodes.
deba@1409:   ///
deba@1409:   /// The nodes section's header line is \c \@nodes \c nodes_id, but the
deba@1409:   /// \c nodes_id may be empty.
deba@1409:   ///
deba@1409:   /// Each line in the section contains the label of the node and 
deba@1409:   /// then the node id. 
deba@1409:   ///
deba@1409:   /// \relates LemonWriter
deba@1409:   template <typename _Graph>
deba@1409:   class NodeWriter : public CommonSectionWriterBase {
deba@1409:     typedef CommonSectionWriterBase Parent;
deba@1409:     typedef _Graph Graph;
deba@1429:     typedef typename Graph::Node Node;
deba@1409:   public:
deba@1409:     
deba@1409:     /// \brief Constructor.
deba@1409:     ///
deba@1409:     /// Constructor for NodeWriter. It creates the NodeWriter and
deba@1409:     /// attach it into the given LemonWriter. The given \c _IdWriter
deba@1409:     /// will write the nodes' id what can be a nodeset writer.
deba@1409:     template <typename _IdWriter>
deba@1409:     NodeWriter(LemonWriter& _writer, const _IdWriter& _idWriter, 
deba@1409: 	       const std::string& _id = std::string()) 
deba@1476:       : Parent(_writer), id(_id) {
deba@1476:       checkConcept<_writer_bits::ItemIdWriter<Node>, _IdWriter>();
deba@1476:       idWriter.reset(new IdWriter<Node, _IdWriter>(_idWriter));
deba@1476:     }
deba@1476: 
deba@1409: 
deba@1409:     /// \brief Destructor.
deba@1409:     ///
deba@1409:     /// Destructor for NodeWriter.
deba@1409:     virtual ~NodeWriter() {}
deba@1409: 
deba@1409:   private:
deba@1409:     NodeWriter(const NodeWriter&);
deba@1409:     void operator=(const NodeWriter&);
deba@1409: 
deba@1409:   public:
deba@1409: 
deba@1409:     /// \brief Add a node writer command for the NodeWriter.
deba@1409:     ///
deba@1409:     /// Add a node writer command for the NodeWriter.
deba@1429:     void writeNode(const std::string& name, const Node& item) {
deba@1409:       writers.push_back(make_pair(name, &item));
deba@1409:     }
deba@1409: 
deba@1409:   protected:
deba@1409: 
deba@1409:     /// \brief Header checking function.
deba@1409:     ///
deba@1421:     /// It gives back true when the header line start with \c \@nodes,
deba@1409:     /// and the header line's id and the writer's id are the same.
deba@1409:     virtual std::string header() {
deba@1409:       return "@nodes " + id;
deba@1409:     }
deba@1409: 
deba@1409:     /// \brief  Writer function of the section.
deba@1409:     ///
deba@1409:     /// Write the content of the section.
deba@1409:     virtual void write(std::ostream& os) {
deba@1476:       if (!idWriter->isIdWriter()) {
deba@1476: 	throw DataFormatError("Cannot find nodeset or ID map");
deba@1476:       }
deba@1409:       for (int i = 0; i < (int)writers.size(); ++i) {
deba@1409: 	os << writers[i].first << ' ';
deba@1409: 	idWriter->write(os, *(writers[i].second));
deba@1409: 	os << std::endl;
deba@1409:       }
deba@1409:     }
deba@1409:     
deba@1409:   private:
deba@1409: 
deba@1409:     std::string id;
deba@1409: 
deba@1429:     typedef std::vector<std::pair<std::string, const Node*> > NodeWriters;
deba@1429:     NodeWriters writers;
deba@1429:     std::auto_ptr<IdWriterBase<Node> > idWriter;
deba@1409:   };
deba@1409: 
deba@1409:   /// \ingroup io_group
deba@1421:   /// \brief SectionWriter for writing labeled edges.
deba@1409:   ///
deba@1409:   /// The edges section's header line is \c \@edges \c edges_id, but the
deba@1409:   /// \c edges_id may be empty.
deba@1409:   ///
deba@1409:   /// Each line in the section contains the label of the edge and 
deba@1409:   /// then the edge id. 
deba@1409:   ///
deba@1409:   /// \relates LemonWriter
deba@1409:   template <typename _Graph>
deba@1409:   class EdgeWriter : public CommonSectionWriterBase {
deba@1409:     typedef CommonSectionWriterBase Parent;
deba@1409:     typedef _Graph Graph;
deba@1429:     typedef typename Graph::Edge Edge;
deba@1409:   public:
deba@1409:     
deba@1409:     /// \brief Constructor.
deba@1409:     ///
deba@1409:     /// Constructor for EdgeWriter. It creates the EdgeWriter and
deba@1409:     /// attach it into the given LemonWriter. The given \c _IdWriter
deba@1409:     /// will write the edges' id what can be a edgeset writer.
deba@1409:     template <typename _IdWriter>
deba@1409:     EdgeWriter(LemonWriter& _writer, const _IdWriter& _idWriter, 
deba@1409: 	       const std::string& _id = std::string()) 
deba@1476:       : Parent(_writer), id(_id) {
deba@1476:       checkConcept<_writer_bits::ItemIdWriter<Edge>, _IdWriter>();
deba@1476:       idWriter.reset(new IdWriter<Edge, _IdWriter>(_idWriter));
deba@1476:     }
deba@1409: 
deba@1409:     /// \brief Destructor.
deba@1409:     ///
deba@1409:     /// Destructor for EdgeWriter.
deba@1409:     virtual ~EdgeWriter() {}
deba@1409:   private:
deba@1409:     EdgeWriter(const EdgeWriter&);
deba@1409:     void operator=(const EdgeWriter&);
deba@1409: 
deba@1409:   public:
deba@1409: 
deba@1421:     /// \brief Add an edge writer command for the EdgeWriter.
deba@1409:     ///
deba@1421:     /// Add an edge writer command for the EdgeWriter.
deba@1429:     void writeEdge(const std::string& name, const Edge& item) {
deba@1409:       writers.push_back(make_pair(name, &item));
deba@1409:     }
deba@1409: 
deba@1409:   protected:
deba@1409: 
deba@1409:     /// \brief Header checking function.
deba@1409:     ///
deba@1421:     /// It gives back true when the header line start with \c \@edges,
deba@1421:     /// and the header line's id and the writer's id are the same.
deba@1421:     virtual std::string header() {
deba@1421:       return "@edges " + id;
deba@1421:     }
deba@1421: 
deba@1421:     /// \brief  Writer function of the section.
deba@1421:     ///
deba@1421:     /// Write the content of the section.
deba@1421:     virtual void write(std::ostream& os) {
deba@1476:       if (!idWriter->isIdWriter()) {
deba@1476: 	throw DataFormatError("Cannot find edgeset or ID map");
deba@1476:       }
deba@1421:       for (int i = 0; i < (int)writers.size(); ++i) {
deba@1421: 	os << writers[i].first << ' ';
deba@1421: 	idWriter->write(os, *(writers[i].second));
deba@1421: 	os << std::endl;
deba@1421:       }
deba@1421:     }
deba@1421:     
deba@1421:   private:
deba@1421: 
deba@1421:     std::string id;
deba@1421: 
deba@1429:     typedef std::vector<std::pair<std::string, const Edge*> > EdgeWriters;
deba@1429:     EdgeWriters writers;
deba@1421: 
deba@1429:     std::auto_ptr<IdWriterBase<Edge> > idWriter;
deba@1421:   };
deba@1421: 
deba@1421:   /// \ingroup io_group
deba@1421:   /// \brief SectionWriter for writing labeled undirected edges.
deba@1421:   ///
deba@1421:   /// The undirected edges section's header line is \c \@undiredges 
deba@1421:   /// \c undiredges_id, but the \c undiredges_id may be empty.
deba@1421:   ///
deba@1421:   /// Each line in the section contains the label of the undirected edge and 
deba@1421:   /// then the undirected edge id. 
deba@1421:   ///
deba@1421:   /// \relates LemonWriter
deba@1421:   template <typename _Graph>
deba@1421:   class UndirEdgeWriter : public CommonSectionWriterBase {
deba@1421:     typedef CommonSectionWriterBase Parent;
deba@1421:     typedef _Graph Graph;
deba@1429:     typedef typename Graph::Node Node;
deba@1429:     typedef typename Graph::Edge Edge;
deba@1429:     typedef typename Graph::UndirEdge UndirEdge;
deba@1421:   public:
deba@1421:     
deba@1421:     /// \brief Constructor.
deba@1421:     ///
deba@1421:     /// Constructor for UndirEdgeWriter. It creates the UndirEdgeWriter and
deba@1421:     /// attach it into the given LemonWriter. The given \c _IdWriter
deba@1421:     /// will write the undirected edges' id what can be an undirected 
deba@1421:     /// edgeset writer.
deba@1421:     template <typename _IdWriter>
deba@1421:     UndirEdgeWriter(LemonWriter& _writer, const _IdWriter& _idWriter, 
deba@1421: 	       const std::string& _id = std::string()) 
deba@1476:       : Parent(_writer), id(_id) {
deba@1476:       checkConcept<_writer_bits::ItemIdWriter<Edge>, _IdWriter>();
deba@1476:       checkConcept<_writer_bits::ItemIdWriter<UndirEdge>, _IdWriter>();
deba@1476:       undirEdgeIdWriter.reset(new IdWriter<UndirEdge, _IdWriter>(_idWriter));
deba@1476:       edgeIdWriter.reset(new IdWriter<Edge, _IdWriter>(_idWriter));
deba@1476:     }
deba@1421: 
deba@1421:     /// \brief Destructor.
deba@1421:     ///
deba@1421:     /// Destructor for UndirEdgeWriter.
deba@1421:     virtual ~UndirEdgeWriter() {}
deba@1421:   private:
deba@1421:     UndirEdgeWriter(const UndirEdgeWriter&);
deba@1421:     void operator=(const UndirEdgeWriter&);
deba@1421: 
deba@1421:   public:
deba@1421: 
deba@1429:     /// \brief Add an edge writer command for the UndirEdgeWriter.
deba@1429:     ///
deba@1429:     /// Add an edge writer command for the UndirEdgeWriter.
deba@1429:     void writeEdge(const std::string& name, const Edge& item) {
deba@1429:       edgeWriters.push_back(make_pair(name, &item));
deba@1429:     }
deba@1429: 
deba@1421:     /// \brief Add an undirected edge writer command for the UndirEdgeWriter.
deba@1421:     ///
deba@1429:     /// Add an undirected edge writer command for the UndirEdgeWriter.
deba@1429:     void writeUndirEdge(const std::string& name, const UndirEdge& item) {
deba@1429:       undirEdgeWriters.push_back(make_pair(name, &item));
deba@1421:     }
deba@1421: 
deba@1421:   protected:
deba@1421: 
deba@1421:     /// \brief Header checking function.
deba@1421:     ///
deba@1421:     /// It gives back true when the header line start with \c \@undiredges,
deba@1409:     /// and the header line's id and the writer's id are the same.
deba@1409:     virtual std::string header() {
deba@1429:       return "@undiredges " + id;
deba@1409:     }
deba@1409: 
deba@1409:     /// \brief  Writer function of the section.
deba@1409:     ///
deba@1409:     /// Write the content of the section.
deba@1409:     virtual void write(std::ostream& os) {
deba@1476:       if (!edgeIdWriter->isIdWriter()) {
deba@1476: 	throw DataFormatError("Cannot find undirected edgeset or ID map");
deba@1476:       }
deba@1476:       if (!undirEdgeIdWriter->isIdWriter()) {
deba@1476: 	throw DataFormatError("Cannot find undirected edgeset or ID map");
deba@1476:       }
deba@1429:       for (int i = 0; i < (int)undirEdgeWriters.size(); ++i) {
deba@1429: 	os << undirEdgeWriters[i].first << ' ';
deba@1429: 	undirEdgeIdWriter->write(os, *(undirEdgeWriters[i].second));
deba@1429: 	os << std::endl;
deba@1429:       }
deba@1429:       for (int i = 0; i < (int)edgeWriters.size(); ++i) {
deba@1429: 	os << edgeWriters[i].first << ' ';
deba@1429: 	edgeIdWriter->write(os, *(edgeWriters[i].second));
deba@1409: 	os << std::endl;
deba@1409:       }
deba@1409:     }
deba@1409:     
deba@1409:   private:
deba@1409: 
deba@1409:     std::string id;
deba@1409: 
deba@1429:     typedef std::vector<std::pair<std::string, 
deba@1429: 				  const UndirEdge*> > UndirEdgeWriters;
deba@1429:     UndirEdgeWriters undirEdgeWriters;
deba@1429:     std::auto_ptr<IdWriterBase<UndirEdge> > undirEdgeIdWriter;
deba@1409: 
deba@1429:     typedef std::vector<std::pair<std::string, const Edge*> > EdgeWriters;
deba@1429:     EdgeWriters edgeWriters;
deba@1429:     std::auto_ptr<IdWriterBase<Edge> > edgeIdWriter;
deba@1429: 
deba@1409:   };
deba@1409: 
deba@1409:   /// \ingroup io_group
deba@1409:   /// \brief SectionWriter for attributes.
deba@1409:   ///
deba@1409:   /// The lemon format can store multiple attribute set. Each set has
deba@1409:   /// the header line \c \@attributes \c attributeset_id, but the 
deba@1409:   /// attributeset_id may be empty.
deba@1409:   ///
deba@1409:   /// The attributeset section contains several lines. Each of them starts
deba@1409:   /// with the name of attribute and then the value.
deba@1409:   ///
deba@1409:   /// \relates LemonWriter
deba@1409:   template <typename _Traits = DefaultWriterTraits>
deba@1409:   class AttributeWriter : public CommonSectionWriterBase {
deba@1409:     typedef CommonSectionWriterBase Parent;
deba@1409:     typedef _Traits Traits; 
deba@1409:   public:
deba@1409:     /// \brief Constructor.
deba@1409:     ///
deba@1409:     /// Constructor for AttributeWriter. It creates the AttributeWriter and
deba@1409:     /// attach it into the given LemonWriter.
deba@1409:     AttributeWriter(LemonWriter& _writer, 
deba@1409: 		    const std::string& _id = std::string()) 
deba@1409:       : Parent(_writer), id(_id) {}
deba@1409: 
deba@1409:     /// \brief Destructor.
deba@1409:     ///
deba@1409:     /// Destructor for AttributeWriter.
deba@1409:     virtual ~AttributeWriter() {
deba@1409:       typename Writers::iterator it;
deba@1409:       for (it = writers.begin(); it != writers.end(); ++it) {
deba@1409: 	delete it->second;
deba@1409:       }
deba@1409:     }
deba@1409: 
deba@1409:   private:
deba@1409:     AttributeWriter(const AttributeWriter&);
deba@1409:     void operator=(AttributeWriter&);
deba@1409: 
deba@1409:   public:
deba@1409:     /// \brief Add an attribute writer command for the writer.
deba@1409:     ///
deba@1409:     /// Add an attribute writer command for the writer.
deba@1409:     template <typename Value>
deba@1409:     AttributeWriter& writeAttribute(const std::string& id, 
deba@1409: 				    const Value& value) {
deba@1409:       return 
deba@1409: 	writeAttribute<typename Traits::template Writer<Value> >(id, value);
deba@1409:     }
deba@1409: 
deba@1409:     /// \brief Add an attribute writer command for the writer.
deba@1409:     ///
deba@1409:     /// Add an attribute writer command for the writer.
deba@1409:     template <typename Writer, typename Value>
deba@1409:     AttributeWriter& writeAttribute(const std::string& name, 
deba@1409: 				    const Value& value,
deba@1409: 				    const Writer& writer = Writer()) {
deba@1409:       writers.push_back(make_pair(name, new ValueWriter<Value, Writer>
deba@1409:       			       (value, writer)));
deba@1409:       return *this;
deba@1409:     }
deba@1409: 
deba@1409:   protected:
deba@1409: 
deba@1409:     /// \brief The header of section.
deba@1409:     ///
deba@1409:     /// It gives back the header of the section.
deba@1409:     std::string header() {
deba@1409:       return "@attributes " + id;
deba@1409:     }
deba@1409: 
deba@1409:     /// \brief  Writer function of the section.
deba@1409:     ///
deba@1409:     /// Write the content of the section.
deba@1409:     void write(std::ostream& os) {
deba@1409:       typename Writers::iterator it;
deba@1409:       for (it = writers.begin(); it != writers.end(); ++it) {
deba@1409: 	os << it->first << ' ';
deba@1409: 	it->second->write(os);
deba@1409: 	os << std::endl;
deba@1409:       }
deba@1409:     }    
deba@1409: 
deba@1409:   private:
deba@1409:     std::string id;
deba@1409: 
deba@1409:     typedef std::vector<std::pair<std::string, ValueWriterBase*> > Writers;
deba@1409:     Writers writers;  
deba@1409:   };
deba@1409: 
deba@1409: 
deba@1409: }
deba@1409: #endif