NavGraph.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#include "TrigCompositeUtils/TrigCompositeUtils.h"
#include "TrigCompositeUtils/NavGraph.h"
#include "AsgTools/CurrentContext.h"
#include "SGCore/sgkey_t.h"
 
#ifndef XAOD_STANDALONE // Athena or AthAnalysis
#include "AthenaKernel/CLIDRegistry.h"
#endif
 
namespace TrigCompositeUtils {
 
  NavGraphNode::NavGraphNode(const Decision* me) : m_decisionObject(me)
  {
  }
 
  bool NavGraphNode::addIfNotDuplicate(std::vector<NavGraphNode*>& container, NavGraphNode* toAdd) {
    const auto it = std::find(container.begin(), container.end(), toAdd);
    if (it == container.end()) {
      container.push_back(toAdd);
      return true;
    }
    return false;
  }
 
 
  bool NavGraphNode::linksTo(NavGraphNode* to) {
    addIfNotDuplicate(to->m_filteredChildren, this);
    return addIfNotDuplicate(m_filteredSeeds, to); // Return TRUE if a new edge is added
  }
 
 
  void NavGraphNode::dropLinks(NavGraphNode* node) {
    m_filteredChildren.erase(std::remove(m_filteredChildren.begin(), m_filteredChildren.end(), node), m_filteredChildren.end());
    m_filteredSeeds.erase(std::remove(m_filteredSeeds.begin(), m_filteredSeeds.end(), node), m_filteredSeeds.end());
  }
 
 
  const Decision* NavGraphNode::node() const {
    return m_decisionObject;
  }
 
 
  const std::vector<NavGraphNode*>& NavGraphNode::seeds() const {
    return m_filteredSeeds;
  }
 
  const std::vector<NavGraphNode*>& NavGraphNode::children() const {
    return m_filteredChildren;
  }
 
 
  void NavGraphNode::keep() {
    m_keepFlag = true;
  }
 
 
  void NavGraphNode::resetKeep() {
    m_keepFlag = false;
  }
 
 
  bool NavGraphNode::getKeep() const {
    return m_keepFlag;
  }
 
 
  // #################################################
 
 
  void NavGraph::addNode(const Decision* node, const Decision* comingFrom) {
    // m_nodes is a vector to preserve iteration ordering for stable output.
    // m_nodePositionMap assures that there is no duplicated NavGraphNode
    // with the same Decision pointer.
    const auto& [nodeItr, newNode] = m_nodePositionMap.emplace(node, m_nodes.size());
    if (newNode) {
      m_nodes.emplace_back( std::make_unique<NavGraphNode>(node) );
    }
    NavGraphNode* nodeObj = m_nodes[nodeItr->second].get();
 
    if (comingFrom == nullptr) { // Not coming from anywhere - hence a final node.
      m_finalNodes.push_back( nodeObj );
    } else {
      const auto& [nodeItr, newNode] = m_nodePositionMap.emplace(comingFrom, m_nodes.size());
      if (newNode) {
        m_nodes.emplace_back( std::make_unique<NavGraphNode>(comingFrom) );
      }
      NavGraphNode* comingFromNodeObj = m_nodes[nodeItr->second].get();
      const bool newEdge = comingFromNodeObj->linksTo( nodeObj );
      if (newEdge) {
        ++m_edges;
      }
    }
  }
 
 
  const std::vector<NavGraphNode*>& NavGraph::finalNodes() const {
    return m_finalNodes;
  }
 
  std::vector<NavGraphNode*> NavGraph::allNodes() {
    std::vector<NavGraphNode*> returnVec;
    returnVec.reserve(m_nodes.size());
    for (std::unique_ptr<NavGraphNode>& entry : m_nodes) {
      NavGraphNode& nodeObj = *entry;
      returnVec.push_back( &nodeObj );
    }
    return returnVec;
  }
 
 
  size_t NavGraph::nodes() const {
    return m_nodes.size();
  }
 
 
  size_t NavGraph::edges() const {
    return m_edges;
  }
 
  std::vector<const Decision*> NavGraph::thin() {
    std::vector<const Decision*> returnVec;
    std::vector<std::unique_ptr<NavGraphNode>>::iterator it;
    for (it = m_nodes.begin(); it != m_nodes.end(); /*noop*/) {
      if ((*it)->getKeep()) {
        (*it)->resetKeep();
        ++it;
      } else {
        returnVec.push_back((*it)->node());
        rewireNodeForRemoval(*(*it));
        it = m_nodes.erase(it);
      }
    }
    return returnVec;
  }
 
  void NavGraph::rewireNodeForRemoval(NavGraphNode& toBeDeleted) {
    const std::vector<NavGraphNode*> myParents = toBeDeleted.seeds();
    const std::vector<NavGraphNode*> myChildren = toBeDeleted.children();
 
    // Perform the (potentially) many-to-many re-linking required to remove toBeDeleted from the graph
    for (NavGraphNode* child : myChildren) {
      for (NavGraphNode* parent : myParents) {
        bool newEdge = child->linksTo(parent);
        if (newEdge) {
          ++m_edges;
        }
      }
    }
 
    // Remove the edges connecting to toBeDeleted from all of its children and all of parents
    for (NavGraphNode* child : myChildren) {
      child->dropLinks(&toBeDeleted);
      --m_edges;
    }
    for (NavGraphNode* parent : myParents) {
      parent->dropLinks(&toBeDeleted);
      --m_edges;
    }
  }
 
 
  void NavGraph::printAllPaths(MsgStream& log, MSG::Level msgLevel) const {
    for (const NavGraphNode* finalNode : m_finalNodes) {
      recursivePrintNavPath(*finalNode, 0, log, msgLevel);
    }
  }
 
 
  void NavGraph::recursivePrintNavPath(const NavGraphNode& nav, size_t level, MsgStream& log, MSG::Level msgLevel) const {
    const Decision* node = nav.node();
    const ElementLink<DecisionContainer> nodeEL = decisionToElementLink( node, Gaudi::Hive::currentContext() );
    std::stringstream ss;
    for (size_t i = 0; i < level; ++i) {
      ss << "  ";
    }
 
    ss << "|-> " << nodeEL.dataID() << " #" << nodeEL.index() << " Name(" << node->name() << ") Passing(" << node->decisions().size() << ")";
    if (nav.getKeep()) ss << " [KEEP]";
    if (node->hasObjectLink(featureString())) {
      SG::sgkey_t key;
      uint32_t clid;
      Decision::index_type index;
      node->typelessGetObjectLink(featureString(), key, clid, index);
#ifndef XAOD_STANDALONE // Athena or AthAnalysis
      ss << " Feature(#" << index << ", " << CLIDRegistry::CLIDToTypeinfo(clid)->name() << ", " << key << ")";
#else
      ss << " Feature(#" << index << ", " << key << ")";
#endif
    }
    if (node->hasObjectLink(viewString())) ss << " [View]";
    if (node->hasObjectLink(roiString())) ss << " [RoI]";
    if (node->hasObjectLink(initialRoIString())) ss << " [InitialRoI]";
    log << msgLevel << ss.str() << endmsg;
    for (const NavGraphNode* seed : nav.seeds()) {
      recursivePrintNavPath(*seed, level + 1, log, msgLevel);
    }
  }
 
}