void Graph::unweighted( const string & startName )
{
clearAll( );
const MapEntry & match = vertexMap.find( MapEntry( startName ) );
if( match == ITEM_NOT_FOUND )
{
cout << startName << " is not a vertex in this graph" << endl;
return;
}
Vertex *start = match.storedVertex;
Queue<Vertex *> q( numVertices );
q.enqueue( start ); start->dist = 0;
while( !q.isEmpty( ) )
{
Vertex *v = q.dequeue( );
ListItr<Vertex *> itr;
for( itr = v->adj.first( ); !itr.isPastEnd( ); itr.advance( ) )
{
Vertex *w = itr.retrieve( );
if( w->dist == INFINITY )
{
w->dist = v->dist + 1;
w->path = v;
q.enqueue( w );
}
}
}
}
void HashTable<HashedObj>::insert( const HashedObj & x )
{
List<HashedObj> & whichList = theLists[ hash( x, theLists.size( ) ) ];
ListItr<HashedObj> itr = whichList.find( x );
if( itr.isPastEnd( ) )
whichList.insert( x, whichList.zeroth( ) );
}
const HashedObj & HashTable<HashedObj>::find( const HashedObj & x ) const
{
ListItr<HashedObj> itr;
itr = theLists[ hash( x, theLists.size( ) ) ].find( x );
if( itr.isPastEnd( ) )
return ITEM_NOT_FOUND;
else
return itr.retrieve( );
}
//Removes the first occurrence of x
void List::remove(int x){
ListItr *l = new ListItr(find(x));
if (!l->isPastEnd())
{
l -> current -> previous -> next = l -> current -> next;
l -> current -> next -> previous = l -> current -> previous;
count -= 1;
}
}
void printList( const List<Object> & theList )
{
if( theList.isEmpty( ) )
cout << "Empty list" << endl;
else
{
ListItr<Object> itr = theList.first( );
for( ; !itr.isPastEnd( ); itr.advance( ) )
cout << itr.retrieve( ) << " ";
}
cout << endl;
}
const List<Object> & List<Object>::operator=( const List<Object> & rhs )
{
if( this != &rhs )
{
makeEmpty( );
ListItr<Object> ritr = rhs.first( );
ListItr<Object> itr = zeroth( );
for( ; !ritr.isPastEnd( ); ritr.advance( ), itr.advance( ) )
insert( ritr.retrieve( ), itr );
}
return *this;
}
ostream & operator<<( ostream & out, const WordEntry & rhs )
{
out << rhs.word << ": ";
if( rhs.lines != NULL && !rhs.lines->isEmpty( ) )
{
ListItr<int> itr = rhs.lines->first( );
out << '\t' << itr.retrieve( );
for( itr.advance( ); !itr.isPastEnd( ); itr.advance( ) )
out << ", " << itr.retrieve( );
}
return out;
}
const HashedObj & ChainingHashTable<HashedObj>::find( const HashedObj & x ) const
{
ListItr<HashedObj> itr;
itr = theLists[ hash( x, theLists.size( ) ) ].find( x );
return itr.isPastEnd( ) ? ITEM_NOT_FOUND : itr.retrieve( );
}
Graph::~Graph( )
{
ListItr<Vertex *> itr;
for( itr = allVertices.first( ); !itr.isPastEnd( ); itr.advance( ) )
delete itr.retrieve( );
}
void Graph::clearAll( )
{
ListItr<Vertex *> itr;
for( itr = allVertices.first( ); !itr.isPastEnd( ); itr.advance( ) )
itr.retrieve( )->reset( );
}
int main ()
/*
** This main driver program interactively exercises a
** list package.
** It assumes a linked list implementation, and its real
** purpose is to exercise the underlying list manipulation
** procedures.
** It uses a menu to accept commands from the terminal,
** then performs the indicated command.
*/
{
int command;
string response;
List *list = NULL;
ListItr *itr = NULL;
// Initialize this run
cout << "--------------------------------------------------\n";
cout << "\tThis test harness operates with one List\n"
<< "\tobject and one ListItr object.\n\n"
<< "\tUse the menu options to manipulate these\n"
<< "\tobjects.\n";
while (1) {
command = menu(option, n_choice);
switch (command) {
case 1: // Quit
cout << "\tDo you really want to quit? (y/n) > ";
cin >> response;
if (response[0] == 'y' || response[0] == 'Y') { // Normal Exit
return 0;
}
break;
case 2: // New list
if (list != NULL) delete list;
list = new List;
cout << "\tYou have created an empty list\n";
cout << "\tDo you want to initialize it with elements? (y/n) > ";
cin >> response;
if (response[0] != 'y' && response[0] != 'Y')
break;
// accept elements
cout << "\t\tEnter elements one by one as integers.\n";
cout << "\t\tAny non-numeric character, e.g. #, ";
cout << "will terminate input\n";
cout << "\tEnter first element: ";
cin >> response;
while (isdigit(response[0])) {
int element = atoi(response.c_str());
list->insertAtTail(element);
cout << "\tEnter next element: ";
cin >> response;
}
cout << endl << "The elements in forward order: " << endl;
printList(*list, true);
break;
case 3: // show elements
if (list == NULL) {
cout << endl << "\tCreate a List first." << endl;
break;
}
cout << "\tPrint the list forwards or backwards? (f/b) > ";
cin >> response;
if (response[0] == 'b' || response[0] == 'B') {
cout << endl << "The elements in reverse order:" << endl;
printList(*list, false);
} else {
cout << endl << "The elements in forward order:" << endl;
printList(*list, true);
}
break;
case 4: // test first()
if (list == NULL) {
cout << endl << "\tCreate a List first." << endl;
break;
}
cout << "\tSetting the ListItr to the first element..." << endl;
itr = new ListItr((list->first()));
break;
case 5: // test find()
if (list == NULL) {
cout << endl << "\tCreate a List first." << endl;
break;
}
cout << "\tEnter element to find: ";
cin >> response;
if (isdigit(response[0])) {
int element = atoi(response.c_str());
itr = new ListItr((list->find(element)));
cout << "\tSetting the ListItr to find("
<< element << ")..." << endl;
} else {
cout << "\tPlease enter an integer." << endl;
}
break;
case 6: // test last()
if (list == NULL) {
cout << endl << "\tCreate a List first." << endl;
}
cout << "\tSetting the ListItr to the last element..." << endl;
itr = new ListItr((list->last()));
break;
case 7: // test moveForwards()
if (itr == NULL) {
cout << endl << "\tCreate a ListItr first." << endl;
break;
}
cout << "\tMoving the ListItr forwards..." << endl;
itr->moveForward();
break;
case 8: // test move_backwards()
if (itr == NULL) {
cout << endl << "\tCreate a ListItr first." << endl;
break;
}
cout << "\tMoving the ListItr backwards..." << endl;
itr->moveBackward();
break;
case 9: // test retrieve()
if (itr == NULL) {
cout << endl << "\tCreate a ListItr first." << endl;
break;
}
if (itr->isPastBeginning())
cout << "\tThe ListItr is past the beginning." << endl;
else if (itr->isPastEnd())
cout << "\tThe ListItr is past the end." << endl;
else
cout << "\tElement retrieved: " << itr->retrieve() << endl;
break;
case 10: // Insert element before
if (list == NULL || itr == NULL) {
cout << endl << "\tCreate a List and ListItr first." << endl;
break;
}
cout << "\tEnter element to insert: ";
cin >> response;
if (isdigit(response[0])) {
int element = atoi(response.c_str());
list->insertBefore(element, *itr);
cout << "\tInserting " << element
<< " before the current ListItr" <<endl;
} else {
cout << "\tPlease enter an integer." << endl;
break;
}
cout << endl << "The elements in forward order: " << endl;
printList(*list, true);
break;
case 11: // Insert element after
if (list == NULL || itr == NULL) {
cout << endl << "\tCreate a List and ListItr first." << endl;
break;
}
cout << "\tEnter element to insert: ";
cin >> response;
if (isdigit(response[0])) {
int element = atoi(response.c_str());
list->insertAfter(element, *itr);
cout << "\tInserting " << element
<< " after the current ListItr" <<endl;
} else {
cout << "\tPlease enter an integer." << endl;
break;
}
cout << endl << "The elements in forward order: " << endl;
printList(*list, true);
break;
case 12: // Insert element at tail
if (list == NULL) {
cout << endl << "\tCreate a List first." << endl;
break;
}
cout << "\tEnter element to insert: ";
cin >> response;
if (isdigit(response[0])) {
int element = atoi(response.c_str());
list->insertAtTail(element);
cout << "\tInserting " << element
<< " at the tail of the list" <<endl;
} else {
cout << "\tPlease enter an integer." << endl;
break;
}
cout << endl << "The elements in forward order: " << endl;
printList(*list, true);
break;
case 13: // Remove element
if (list == NULL) {
cout << endl << "\tCreate a List first." << endl;
break;
}
cout << "\tEnter element to remove: ";
cin >> response;
if (isdigit(response[0])) {
int element = atoi(response.c_str());
list->remove(element);
cout << "\tRemoving " << element
<< " from list" <<endl;
} else {
cout << "\tPlease enter an integer." << endl;
break;
}
cout << endl << "The elements in forward order: " << endl;
printList(*list, true);
break;
case 14: // test size()
if (list == NULL) {
cout << endl << "\tCreate a List first." << endl;
break;
}
cout << "\tSize of list: " << list->size() << endl;
break;
case 15: { // test copy constructor
List* old_list=list;
list=new List(*old_list);
old_list->makeEmpty();
cout << "The new list is (forward ): " ;
printList(*list, true);
cout << "The new list is (backward): " ;
printList(*list, false);
cout << "The old list was made empty (forward ): ";
printList(*old_list, true);
cout << "The old list was made empty (backward): ";
printList(*old_list, false);
cout << "The old list should be destroyed now." << endl;
delete old_list;
break;
}
case 16: { // test equals operator
List* old_list=list;
list=new List();
*list=*old_list;
old_list->makeEmpty();
cout << "The new list is (forward ): " ;
printList(*list,true);
cout << "The new list is (backward): " ;
printList(*list,false);
cout << "The old list was made empty (forward ): " ;
printList(*old_list,true);
cout << "The old list was made empty (backward): " ;
printList(*old_list,false);
cout << "The old list should be destroyed now." << endl;
delete old_list;
break;
}
case 17: // test makeEmpty()
if (list == NULL) {
cout << endl << "\tCreate a List first." << endl;
break;
}
cout << "The list is (forward ): " ;
printList(*list,true);
cout << "The list is (backward): " ;
printList(*list,false);
list->makeEmpty();
cout << "The list was made empty (forward ): " ;
printList(*list,true);
cout << "The list was made empty (backward): " ;
printList(*list,false);
} // end of switch (command)
} // end of while (1)
} // end of main()
void SongSearch::query(const Request &request, Song answer[], int *answerCount)
{
int counter = 0;
if(request.type == 0){
Song *temp;
for(int i = 0; i < titles.size() ; i++){
if( titles[i] != NULL && strstr(titles[i]->common, request.criteria) != NULL){
for( ListItr <Song *> itr = titles[i]->list->first(); !itr.isPastEnd(); itr.advance()){
temp = (Song *) itr.retrieve();
//cout << temp->title << endl;
copy(answer[counter], temp);
counter++;
}
}
}
*answerCount = counter;
}
else if(request.type == 1){
const holdlink* link = linearprobingtitle->find(request.criteria);
Song *temp;
for( ListItr <Song *>itr = link->list->first(); !itr.isPastEnd(); itr.advance()){
temp = (Song *) itr.retrieve();
copy(answer[counter], temp);
counter++;
}
*answerCount = counter;
}
else if(request.type == 2){
const holdlink* link = linearprobingartist->find(request.criteria);
Song *temp;
for( ListItr <Song *> itr = link->list->first(); !itr.isPastEnd(); itr.advance()){
temp = (Song *) itr.retrieve();
copy(answer[counter], temp);
counter++;
}
*answerCount = counter;
}
else if(request.type == 3){ //WORKS
*answerCount = 0;
for(int i = 0; i < songCount; i++){
if(strcmp(songs[i]->ID, request.criteria) == 0 ){
copy(answer[*answerCount], songs[i]);
(*answerCount)++;
for(int j = i+1; j < songCount; j++){
if(strcmp(songs[j]->ID, request.criteria2) == 0){
while(strcmp(songs[j]->ID, request.criteria2) == 0){
copy(answer[*answerCount], songs[j]);
(*answerCount)++;
j++;
}
return;
}
else{
copy(answer[*answerCount], songs[j]);
(*answerCount)++;
}
}
}
}
}
else if (request.type == 4){
const holdlink* link = linearprobingalbum->find(request.criteria);
Song *temp;
for( ListItr <Song *> itr = link->list->first(); !itr.isPastEnd(); itr.advance()){
temp = (Song *) itr.retrieve();
copy(answer[counter], temp);
counter++;
}
*answerCount = counter;
}
return;
}