source: lemon-0.x/src/lemon/graph_writer.h @ 1410:dcfad73b3965

/* -*- C++ -*-
 * src/lemon/graph_writer.h - Part of LEMON, a generic C++ optimization library
 *
 * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 * (Egervary Research Group on Combinatorial Optimization, EGRES).
 *
 * Permission to use, modify and distribute this software is granted
 * provided that this copyright notice appears in all copies. For
 * precise terms see the accompanying LICENSE file.
 *
 * This software is provided "AS IS" with no warranty of any kind,
 * express or implied, and with no claim as to its suitability for any
 * purpose.
 *
 */

///\ingroup io_group
///\file
///\brief Lemon Graph Format writer.

#ifndef LEMON_GRAPH_WRITER_H
#define LEMON_GRAPH_WRITER_H

#include <iostream>

#include <lemon/error.h>
#include <lemon/lemon_writer.h>

namespace lemon {

  /// \addtogroup io_group
  /// @{

  /// \brief The graph writer class.
  ///
  /// The \c GraphWriter class provides the graph output. To write a graph
  /// you should first give writing commands for the writer. You can declare
  /// write command as \c NodeMap or \c EdgeMap writing and labeled Node and
  /// Edge writing.
  ///
  /// \code
  /// GraphWriter<ListGraph> writer(std::cout, graph);
  /// \endcode
  ///
  /// The \c writeNodeMap() function declares a \c NodeMap writing 
  /// command in the \c GraphWriter. You should give as parameter 
  /// the name of the map and the map object. The NodeMap writing 
  /// command with name "id" should write a unique map because it 
  /// is regarded as ID map.
  ///
  /// \code
  /// IdMap<ListGraph, Node> nodeIdMap;
  /// writer.writeNodeMap("id", nodeIdMap);
  ///
  /// writer.writeNodeMap("x-coord", xCoordMap);
  /// writer.writeNodeMap("y-coord", yCoordMap);
  /// writer.writeNodeMap("color", colorMap);
  /// \endcode
  ///
  /// With the \c writeEdgeMap() member function you can give an edge map
  /// writing command similar to the NodeMaps.
  ///
  /// \code
  /// DescriptorMap<ListGraph, Edge, ListGraph::EdgeMap<int> > 
  ///   edgeDescMap(graph);
  /// writer.writeEdgeMap("descriptor", edgeDescMap);
  ///
  /// writer.writeEdgeMap("weight", weightMap);
  /// writer.writeEdgeMap("label", labelMap);
  /// \endcode
  ///
  /// With \c writeNode() and \c writeEdge() functions you can 
  /// point out Nodes and Edges in the graph. By example, you can 
  /// write out the source and target of the graph.
  ///
  /// \code
  /// writer.writeNode("source", sourceNode);
  /// writer.writeNode("target", targetNode);
  ///
  /// writer.writeEdge("observed", edge);
  /// \endcode
  ///
  /// After you give all write commands you must call the \c run() member
  /// function, which execute all the writer commands.
  ///
  /// \code
  /// writer.run();
  /// \endcode
  ///
  /// \see DefaultWriterTraits
  /// \see QuotedStringWriter
  /// \see IdMap
  /// \see DescriptorMap
  /// \see \ref GraphWriter
  /// \see \ref graph-io-page
  /// \author Balazs Dezso
  template <typename _Graph, typename _WriterTraits = DefaultWriterTraits> 
  class GraphWriter {
  public:
    
    typedef _Graph Graph;
    typedef typename Graph::Node Node;
    typedef typename Graph::Edge Edge;

    typedef _WriterTraits WriterTraits;

    /// \brief Construct a new GraphWriter.
    ///
    /// Construct a new GraphWriter. It writes the given graph
    /// to the given stream.
    GraphWriter(std::ostream& _os, const Graph& _graph) 
      : writer(new LemonWriter(_os)), own_writer(true), 
        graph(_graph), 
        nodeset_writer(*writer, graph, std::string()),
        edgeset_writer(*writer, graph, nodeset_writer, std::string()),
        node_writer(*writer, nodeset_writer, std::string()),
        edge_writer(*writer, edgeset_writer, std::string()),
        attribute_writer(*writer, std::string()) {}

    /// \brief Construct a new GraphWriter.
    ///
    /// Construct a new GraphWriter. It writes into the given graph
    /// to the given file.
    GraphWriter(const std::string& _filename, const Graph& _graph) 
      : writer(new LemonWriter(_filename)), own_writer(true), 
        graph(_graph),
        nodeset_writer(*writer, graph, std::string()),
        edgeset_writer(*writer, graph, nodeset_writer, std::string()),
        node_writer(*writer, nodeset_writer, std::string()),
        edge_writer(*writer, edgeset_writer, std::string()),
        attribute_writer(*writer, std::string()) {}

    /// \brief Construct a new GraphWriter.
    ///
    /// Construct a new GraphWriter. It writes into the given graph
    /// to given LemonReader.
    GraphWriter(LemonWriter& _writer, const Graph& _graph)
      : writer(_writer), own_writer(false), 
        graph(_graph),
        nodeset_writer(*writer, graph, std::string()),
        edgeset_writer(*writer, graph, nodeset_writer, std::string()),
        node_writer(*writer, nodeset_writer, std::string()),
        edge_writer(*writer, edgeset_writer, std::string()),
        attribute_writer(*writer, std::string()) {}

    /// \brief Destruct the graph writer.
    ///
    /// Destruct the graph writer.
    ~GraphWriter() {
      if (own_writer) 
        delete writer;
    }

    /// \brief Add a new node map writer command for the writer.
    ///
    /// Add a new node map writer command for the writer.
    template <typename Map>
    GraphWriter& writeNodeMap(std::string name, const Map& map) {
      nodeset_writer.writeMap(name, map);
      return *this;
    }

    /// \brief Add a new node map writer command for the writer.
    ///
    /// Add a new node map writer command for the writer.
    template <typename Writer, typename Map>
    GraphWriter& writeNodeMap(std::string name, const Map& map, 
                             const Writer& writer = Writer()) {
      nodeset_writer.writeMap(name, map, writer);
      return *this;
    }


    /// \brief Add a new edge map writer command for the writer.
    ///
    /// Add a new edge map writer command for the writer.
    template <typename Map>
    GraphWriter& writeEdgeMap(std::string name, const Map& map) { 
      edgeset_writer.writeMap(name, map);
      return *this;
    }


    /// \brief Add a new edge map writer command for the writer.
    ///
    /// Add a new edge map writer command for the writer.
    template <typename Writer, typename Map>
    GraphWriter& writeEdgeMap(std::string name, const Map& map,
                             const Writer& writer = Writer()) {
      edgeset_writer.writeMap(name, map, writer);
      return *this;
    }

    /// \brief Add a new labeled node writer for the writer.
    ///
    /// Add a new labeled node writer for the writer.
    GraphWriter& writeNode(std::string name, const Node& node) {
      node_writer.writeNode(name, node);
      return *this;
    }

    /// \brief Add a new labeled edge writer for the writer.
    ///
    /// Add a new labeled edge writer for the writer.
    GraphWriter& writeEdge(std::string name, const Edge& edge) {
      edge_writer.writeEdge(name, edge);
    }

    /// \brief Add a new attribute writer command.
    ///
    ///  Add a new attribute writer command.
    template <typename Value>
    GraphWriter& writeAttribute(std::string name, const Value& value) {
      attribute_writer.writeAttribute(name, value);
      return *this;
    }
    
    /// \brief Add a new attribute writer command.
    ///
    ///  Add a new attribute writer command.
    template <typename Writer, typename Value>
    GraphWriter& writeAttribute(std::string name, const Value& value, 
                               const Writer& writer) {
      attribute_writer.writeAttribute<Writer>(name, value, writer);
      return *this;
    }

    /// \brief Conversion operator to LemonWriter.
    ///
    /// Conversion operator to LemonWriter. It make possible
    /// to access the encapsulated \e LemonWriter, this way
    /// you can attach to this writer new instances of 
    /// \e LemonWriter::SectionWriter.
    operator LemonWriter&() {
      return *writer;
    }

    /// \brief Executes the writer commands.
    ///
    /// Executes the writer commands.
    void run() {
      writer->run();
    }

  private:

    LemonWriter* writer;
    bool own_writer;

    const Graph& graph;

    NodeSetWriter<Graph, WriterTraits> nodeset_writer;
    EdgeSetWriter<Graph, WriterTraits> edgeset_writer;

    NodeWriter<Graph> node_writer;
    EdgeWriter<Graph> edge_writer;
    
    AttributeWriter<WriterTraits> attribute_writer;
  };


  /// \brief Write a graph to the output.
  ///
  /// Write a graph to the output.
  /// \param os The output stream.
  /// \param g The graph.
  /// \param capacity The capacity map.
  /// \param s The source node.
  /// \param t The target node.
  /// \param cost The cost map.
  template<typename Graph, typename CapacityMap, typename CostMap>
  void writeGraph(std::ostream& os, const Graph &g, 
                  const CapacityMap& capacity, const typename Graph::Node &s,
                  const typename Graph::Node &t, const CostMap& cost) {
    GraphWriter<Graph> writer(os, g);
    IdMap<Graph, typename Graph::Node> nodeIdMap(g);
    writer.writeNodeMap("id", nodeIdMap);
    IdMap<Graph, typename Graph::Edge> edgeIdMap(g);
    writer.writeEdgeMap("id", edgeIdMap);
    writer.writeEdgeMap("capacity", capacity);
    writer.writeEdgeMap("cost", cost);
    writer.writeNode("source", s);
    writer.writeNode("target", t);
    writer.run();
  }

  /// \brief Write a graph to the output.
  ///
  /// Write a graph to the output.
  /// \param os The output stream.
  /// \param g The graph.
  /// \param capacity The capacity map.
  /// \param s The source node.
  /// \param t The target node.
  template<typename Graph, typename CapacityMap>
  void writeGraph(std::ostream& os, const Graph &g, 
                  const CapacityMap& capacity, const typename Graph::Node &s,
                  const typename Graph::Node &t) {
    GraphWriter<Graph> writer(os, g);
    IdMap<Graph, typename Graph::Node> nodeIdMap(g);
    writer.writeNodeMap("id", nodeIdMap);
    IdMap<Graph, typename Graph::Edge> edgeIdMap(g);
    writer.writeEdgeMap("id", edgeIdMap);
    writer.writeEdgeMap("capacity", capacity);
    writer.writeNode("source", s);
    writer.writeNode("target", t);
    writer.run();
  }

  /// \brief Write a graph to the output.
  ///
  /// Write a graph to the output.
  /// \param os The output stream.
  /// \param g The graph.
  /// \param capacity The capacity map.
  /// \param s The source node.
  template<typename Graph, typename CapacityMap>
  void writeGraph(std::ostream& os, const Graph &g, 
                  const CapacityMap& capacity, const typename Graph::Node &s) {
    GraphWriter<Graph> writer(os, g);
    IdMap<Graph, typename Graph::Node> nodeIdMap(g);
    writer.writeNodeMap("id", nodeIdMap);
    IdMap<Graph, typename Graph::Edge> edgeIdMap(g);
    writer.writeEdgeMap("id", edgeIdMap);
    writer.writeEdgeMap("capacity", capacity);
    writer.writeNode("source", s);
    writer.run();
  }

  /// \brief Write a graph to the output.
  ///
  /// Write a graph to the output.
  /// \param os The output stream.
  /// \param g The graph.
  /// \param capacity The capacity map.
  template<typename Graph, typename CapacityMap>
  void writeGraph(std::ostream& os, const Graph &g, 
                  const CapacityMap& capacity) {
    GraphWriter<Graph> writer(os, g);
    IdMap<Graph, typename Graph::Node> nodeIdMap(g);
    writer.writeNodeMap("id", nodeIdMap);
    IdMap<Graph, typename Graph::Edge> edgeIdMap(g);
    writer.writeEdgeMap("id", edgeIdMap);
    writer.writeEdgeMap("capacity", capacity);
    writer.run();
  }

  /// \brief Write a graph to the output.
  ///
  /// Write a graph to the output.
  /// \param os The output stream.
  /// \param g The graph.
  template<typename Graph>
  void writeGraph(std::ostream& os, const Graph &g) {
    GraphWriter<Graph> writer(os, g);
    IdMap<Graph, typename Graph::Node> nodeIdMap(g);
    writer.writeNodeMap("id", nodeIdMap);
    IdMap<Graph, typename Graph::Edge> edgeIdMap(g);
    writer.writeEdgeMap("id", edgeIdMap);
    writer.run();
  }

  /// @}

}

#endif