class Graph in Java

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class Graph
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public: Graph( ) -Graph (
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28 29 30 31 private: 32 33 Vertex * getVertex( const string & vertexName ) ; 34 void printpath( const Vertex & dest ) const; 35 void clearAll( ) ; 36 37 typedef map<string,Vertex *,lesscstring> > vrnap; 38 39 / / Copy semantics are disabled; these make no sense 40 Graph( const Graph & rhs ) ( } 41 const Graph & operator= ( const Graph & rhs ) 42 { return *this; ) 43 44 m a p vertexMap ; 45 1;
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void addEdge( const string & sourceName, const string & destName, double cost void printpath( const string & destName ) const; void unweightedi const string & startName ) ; void dijkstra( const string & startName ) ; void negative( const string & startName ) ; void acyclic( const string & startName ) ;
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The Graph class interface
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Graphs and Paths
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1 / / Destructor: clean up the Vertex objects 2 Graph : : -Graph ( ) 3 t 4 for( vmap::iterator itr = vertexMapbegin( ) ; 5 itr ! = vertexMapend( ) ; ++itr 6 delete (*itr)second;
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The Graph class destructor
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1 / / If vertexName is not present, add it to vertexMap 2 / / In either case, return (a pointer to) the Vertex 3 Vertex * Graph::getVertex( const string & vertexName ) 4 { 5 vmap::iterator itr = vertexMapfind( vertexName ) ;
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7 if( itr
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vertexMapend(
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Vertex *newv = new Vertex( vertexName vertexMap[ vertexName ] = n e w ; return n e w ;
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1 return ("itr) second;
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Figure 1510 The getvertex routine returns a pointer to the Vertex object that represents vertexName, creating the object if it needs to do SO
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1 / / Add a new edge to the graph 2 void Graph::addEdge( const string 3 const string
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sourceName, destName, double cost
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Vertex * v = getVertex( sourceName Vertex * w = getVertex( destName ) ; v->adjpush-back( Edge( w , cost ) )
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Figure 1511 Add an edge to the graph
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/ / Initialize the vertex output info prior to running / / any shortest path algorithm
void Graph : : clearAll( ) i for( vmap::iterator itr = vertexMapbegini 1 ; itr ! = vertexMapend( ) ; ++itr (*itr)second->reset( ; )
Figure 1512 Private routine for initializing the output members for use by the shortest-path algorithms 1 2 3 4 5 6 7 8 9 10 11 12
/ / Recursive routine to print shortest path to dest / / after running shortest path algorithm The path / / is known to exist
void Graph::printPath( const Vertex i if( destprev ! = NULL ) i printpath( *destprev ) ; cout < < " to " ;
dest
const
cout << destname;
Figure 1513 A recursive routine for printing the shortest path 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
/ / Driver routine to handle unreachables and print total cost / / It calls recursive routine to print shortest path to / / destNode after a shortest path algorithm has run
void Graph::printPath( const string
destName
const
vrnap::const-iterator itr = vertexMapfind( destName ) ; if( itr = = vertexMapend( ) ) throw GraphException( "Destination vertex not found" const Vertex & w = *(*itr) second; if( wdist == INFINITY ) cout << destName < c " is unreachable"; else
cout << "(Cost is: " << wdist << printpath ( w ) ;
cout < < endl;
Figure 1514 A routine for printing the shortest path by consulting the graph table (see Figure 155)
d Paths
1 / / A simple main that reads the file given by argv[l] 2 / / and then calls processRequest to compute shortest paths 3 / / Skimpy error checking in order to concentrate on the basics 4 int main( int argc, char *argv[ I 5 { 6 if( argc ! = 2 ) 7 { 8 cerr < < "Usage: " < < argv( 0 ] << " graphfile' << endl; 9 return 1; 10 1 11 12 ifstream inFile( argv[ 1 ] ) ; 13 if( !inFile ) 14 ( 15 cerr << "Cannot open " < < argv[ 1 ] < < endl; 16 return 1 ; 17 1 18 19 cout < < "Reading file < < endl; 20 string oneline; 21 22 :/ Read the edges; add them to g 23 Graph g ; 24 while( !getline( infile, oneLine ) eof( ) ) 25 { 26 string source, dest; 27 double cost; 28 istringstream st( oneLine 1 ; 29 30 st > > source; st >> dest; st > > cost; 31 if( stfail( ) ) 32 cerr < < "Bad line: " < < oneLine < < endl; 33 else 34 gaddEdgei source, dest, cost 1 ; 35 I 36 cout < < "File read" < < end1 < < endl; 37 while( processRequest ( cin, g ) ) 38 39 40 41 return 0; 42 I