SyncPlanComponents.h

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#pragma once
 
#include <ogdf/basic/Graph.h>
#include <ogdf/basic/GraphSets.h>
#include <ogdf/basic/basic.h>
#include <ogdf/basic/pctree/util/FilteringBFS.h>
#include <ogdf/decomposition/BCTree.h>
 
#include <functional>
#include <iosfwd>
#include <utility>
 
namespace ogdf {
template<class E>
class List;
template<class E>
class SList;
template<class E>
class SListPure;
} // namespace ogdf
 
namespace ogdf::sync_plan {
namespace internal {
struct EncapsulatedBlock;
}
 
class OGDF_EXPORT SyncPlanComponents {
    friend class SyncPlan;
 
    friend class SyncPlanConsistency;
 
    friend class SyncPlanDrawer;
 
private:
    Graph* G;
    Graph BC;
    int conn_count, conn_next_id;
 
    NodeArray<BCTree::BNodeType> bc_type;
    NodeArray<int> bc_conn_id;
    NodeArray<int> bc_size;
    NodeArray<node> bc_g;
    NodeArray<node> g_bc;
 
    mutable int counter = 1;
    mutable NodeArray<std::pair<int, edge>> marker; // used by graphEdgeToBCEdge
 
public:
    explicit SyncPlanComponents(Graph* g) : G(g), BC(), marker(BC, std::pair(0, nullptr)) {
        reset();
    }
 
    int connectedCount() const { return conn_count; }
 
    int connectedId(node n) const { return bcConnectedId(biconnectedComponent(n)); }
 
    int biconnectedId(node n) const { return biconnectedComponent(n)->index(); }
 
    node biconnectedComponent(node n) const;
 
    BCTree::GNodeType nodeType(node n) const;
 
    bool isCutVertex(node n) const { return nodeType(n) == BCTree::GNodeType::CutVertex; }
 
    Graph& graph() const { return *G; }
 
    const Graph& bcTree() const { return BC; }
 
    BCTree::BNodeType bcNodeType(node n) const;
 
    bool isCutComponent(node n) const { return bcNodeType(n) == BCTree::BNodeType::CComp; }
 
    int bcSize(node n) const;
 
    int bcConnectedId(node n) const;
 
    node bcRepr(node bc) const;
 
    node findOtherRepr(node bc) const;
 
    std::function<std::ostream&(std::ostream&)> fmtBCNode(node bc) const;
 
    std::function<std::ostream&(std::ostream&)> fmtBCOf(node n) const {
        return fmtBCNode(biconnectedComponent(n));
    }
 
 
    std::pair<edge, edge> graphEdgeToBCEdge(node bc_src, node bc_tgt) const;
 
    node findCommonBiconComp(node bc_cut1, node bc_cut2) const;
 
    void biconReprNodes(node bicon, SList<node>& nodes) const;
 
    FilteringBFS nodesInBiconnectedComponent(node bicon) const;
 
 
private:
    void reset() {
        conn_count = conn_next_id = 0;
        bc_conn_id.init(BC, -1);
        g_bc.init(*G, nullptr);
        bc_g.init(BC, nullptr);
        bc_size.init(BC, 0);
        bc_type.init(BC, BCTree::BNodeType::BComp);
    }
 
    void makeRepr(node bc, node n);
 
    void nodeInserted(node g_n, node bc_n);
 
    void insert(BCTree& tmp_bc);
 
    void cutReplacedByWheel(node centre, const NodeArray<SList<adjEntry>>& block_neigh);
 
    void relabelExplodedStar(node center1, node center2, List<node> remnants);
 
    void preJoin(node keep, node merge);
 
    void postSplitOffEncapsulatedBlock(node cut, internal::EncapsulatedBlock& block);
 
    void labelIsolatedNodes();
};
 
class OGDF_EXPORT BiconnectedIsolation {
    SyncPlanComponents& m_comps;
    node m_bicon;
    NodeSet<true> m_to_restore;
    NodeArray<SListPure<adjEntry>> m_adjEntries; // room for improvement: replace by contiguous vector + indices
    Graph::HiddenEdgeSet m_hiddenEdges;
 
public:
    explicit BiconnectedIsolation(SyncPlanComponents& comps, node bicon);
 
    ~BiconnectedIsolation() { restore(); }
 
    void restore(bool restore_embedding = true);
};
}