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#include <QtCore/QHash>
#include <QtCore/QQueue>
#include <QtCore/QString>
#include <QtCore/QDebug>
#include <float.h>
QT_BEGIN_NAMESPACE
template <typename Vertex, typename EdgeData>
class Graph
{
public:
Graph() {}
class const_iterator {
public:
const_iterator(const Graph *graph, bool begin) : g(graph){
if (begin) {
row = g->m_graph.constBegin();
//test if the graph is empty
if (row != g->m_graph.constEnd())
{
column = (*row)->constBegin();
}
} else {
row = g->m_graph.constEnd();
}
}
inline Vertex *operator*() {
return column.key();
}
inline Vertex *from() const {
return row.key();
}
inline Vertex *to() const {
return column.key();
}
inline bool operator==(const const_iterator &o) const { return !(*this != o); }
inline bool operator!=(const const_iterator &o) const {
if (row == g->m_graph.end()) {
return row != o.row;
} else {
return row != o.row || column != o.column;
}
}
inline const_iterator& operator=(const const_iterator &o) const { row = o.row; column = o.column; return *this;}
// prefix
const_iterator &operator++() {
if (row != g->m_graph.constEnd()) {
++column;
if (column == (*row)->constEnd()) {
++row;
if (row != g->m_graph.constEnd()) {
column = (*row)->constBegin();
}
}
}
return *this;
}
private:
const Graph *g;
Q_TYPENAME QHash<Vertex *, QHash<Vertex *, EdgeData *> * >::const_iterator row;
Q_TYPENAME QHash<Vertex *, EdgeData *>::const_iterator column;
};
const_iterator constBegin() const {
return const_iterator(this,true);
}
const_iterator constEnd() const {
return const_iterator(this,false);
}
/*!
* \internal
*
* If there is an edge between \a first and \a second, it will return a structure
* containing the data associated with the edge, otherwise it will return 0.
*
*/
EdgeData *edgeData(Vertex* first, Vertex* second) {
QHash<Vertex *, EdgeData *> *row = m_graph.value(first);
return row ? row->value(second) : 0;
}
void createEdge(Vertex *first, Vertex *second, EdgeData *data)
{
// Creates a bidirectional edge
#if defined(QT_DEBUG) && 0
qDebug("Graph::createEdge(): %s",
qPrintable(QString::fromAscii("%1-%2")
.arg(first->toString()).arg(second->toString())));
#endif
if (edgeData(first, second)) {
#ifdef QT_DEBUG
qWarning(qPrintable(QString::fromAscii("%1-%2 already has an edge")
.arg(first->toString()).arg(second->toString())));
#endif
}
createDirectedEdge(first, second, data);
createDirectedEdge(second, first, data);
}
void removeEdge(Vertex *first, Vertex *second)
{
// Removes a bidirectional edge
#if defined(QT_DEBUG) && 0
qDebug("Graph::removeEdge(): %s",
qPrintable(QString::fromAscii("%1-%2")
.arg(first->toString()).arg(second->toString())));
#endif
EdgeData *data = edgeData(first, second);
removeDirectedEdge(first, second);
removeDirectedEdge(second, first);
if (data) delete data;
}
EdgeData *takeEdge(Vertex* first, Vertex* second)
{
#if defined(QT_DEBUG) && 0
qDebug("Graph::takeEdge(): %s",
qPrintable(QString::fromAscii("%1-%2")
.arg(first->toString()).arg(second->toString())));
#endif
// Removes a bidirectional edge
EdgeData *data = edgeData(first, second);
if (data) {
removeDirectedEdge(first, second);
removeDirectedEdge(second, first);
}
return data;
}
QList<Vertex *> adjacentVertices(Vertex *vertex) const
{
QHash<Vertex *, EdgeData *> *row = m_graph.value(vertex);
QList<Vertex *> l;
if (row)
l = row->keys();
return l;
}
void setRootVertex(Vertex *vertex)
{
userVertex = vertex;
}
QSet<Vertex*> vertices() const {
QSet<Vertex *> setOfVertices;
for (const_iterator it = constBegin(); it != constEnd(); ++it) {
setOfVertices.insert(*it);
}
return setOfVertices;
}
QList<QPair<Vertex*, Vertex*> > connections() const {
QList<QPair<Vertex*, Vertex*> > conns;
for (const_iterator it = constBegin(); it != constEnd(); ++it) {
Vertex *from = it.from();
Vertex *to = it.to();
// do not return (from,to) *and* (to,from)
if (from < to) {
conns.append(qMakePair(from, to));
}
}
return conns;
}
#if defined(QT_DEBUG)
QString serializeToDot() { // traversal
QString strVertices;
QString edges;
QSet<Vertex *> setOfVertices = vertices();
for (Q_TYPENAME QSet<Vertex*>::const_iterator it = setOfVertices.begin(); it != setOfVertices.end(); ++it) {
Vertex *v = *it;
QList<Vertex*> adjacents = adjacentVertices(v);
for (int i = 0; i < adjacents.count(); ++i) {
Vertex *v1 = adjacents.at(i);
EdgeData *data = edgeData(v, v1);
bool forward = data->from == v;
if (forward) {
edges += QString::fromAscii("%1->%2 [label=\"[%3,%4,%5]\" dir=both color=\"#000000:#a0a0a0\"] \n")
.arg(v->toString())
.arg(v1->toString())
.arg(data->minSize)
.arg(data->prefSize)
.arg(data->maxSize)
;
}
}
strVertices += QString::fromAscii("%1 [label=\"%2\"]\n").arg(v->toString()).arg(v->toString());
}
return QString::fromAscii("%1\n%2\n").arg(strVertices).arg(edges);
}
#endif
Vertex *rootVertex() const
{
return userVertex;
}
protected:
void createDirectedEdge(Vertex *from, Vertex *to, EdgeData *data)
{
QHash<Vertex *, EdgeData *> *adjacentToFirst = m_graph.value(from);
if (!adjacentToFirst) {
adjacentToFirst = new QHash<Vertex *, EdgeData *>();
m_graph.insert(from, adjacentToFirst);
}
adjacentToFirst->insert(to, data);
}
void removeDirectedEdge(Vertex *from, Vertex *to)
{
QHash<Vertex *, EdgeData *> *adjacentToFirst = m_graph.value(from);
Q_ASSERT(adjacentToFirst);
adjacentToFirst->remove(to);
if (adjacentToFirst->isEmpty()) {
//nobody point to 'from' so we can remove it from the graph
m_graph.remove(from);
delete adjacentToFirst;
}
}
private:
Vertex *userVertex;
QHash<Vertex *, QHash<Vertex *, EdgeData *> *> m_graph;
};
QT_END_NAMESPACE
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