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/**************************************************************************
songlist.cc - class SongList, which holds a list of songs (collection)
Copyright (C) 1997,98 Antonio Larrosa Jimenez
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Send comments and bug fixes to [email protected]
or to Antonio Larrosa, Rio Arnoya, 10 5B, 29006 Malaga, Spain
***************************************************************************/
#include "songlist.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
SongList::SongList(void)
{
list=NULL;
last=NULL;
active=NULL;
ntotal=0;
}
SongList::SongList(SongList &src)
{
list=last=active=NULL;
ntotal=0;
src.iteratorStart();
while (!src.iteratorAtEnd())
{
AddSong(src.getIteratorName());
src.iteratorNext();
}
if (src.active!=NULL) active=getSongid(src.active->id);
}
SongList::~SongList()
{
clean();
Song *ptr=list;
active=last=NULL;
ntotal=0;
while (ptr!=NULL)
{
list=ptr->next;
delete ptr->name;
delete ptr;
ptr=list;
}
}
SongList::Song *SongList::getSongid(int id)
{
Song *ptr=list;
while ((ptr!=NULL)&&(ptr->id!=id))
ptr=ptr->next;
return ptr;
}
int SongList::AddSong(const char *song)
{
if (!song) return 0;
if (last==NULL)
{
last=new Song;
list=last;
}
else
{
last->next=new Song;
last=last->next;
}
last->name=new char[strlen(song)+1];
strcpy(last->name,song);
last->id= ++ntotal;
last->next=NULL;
if (active==NULL) active=last;
return last->id;
}
void SongList::DelSong(int id)
{
Song *ptr;
if (list==NULL) return;
if (id==1)
{
if (last->id==1)
{
list=last=active=NULL;
ntotal=0;
}
else
{
ptr=list;
if (active->id==1) active=list->next;
list=list->next;
delete ptr->name;
delete ptr;
ntotal--;
regenerateid(list,1);
}
return;
}
Song *ptr_prev=getSongid(id-1);
ptr=ptr_prev->next;
if (last->id==id) last=ptr_prev;
if (active->id==id)
if (active->next!=NULL) active=active->next;
else active=ptr_prev;
ntotal--;
ptr_prev->next=ptr->next;
delete ptr->name;
delete ptr;
regenerateid(ptr_prev->next,id);
}
void SongList::regenerateid(Song *song,int id)
{
Song *tmp=song;
int i=id;
while (tmp!=NULL)
{
tmp->id=i++;
tmp=tmp->next;
}
ntotal=i-1;
}
void SongList::setActiveSong(int id)
{
Song *tmp=getSongid(id);
if (tmp!=NULL) active=tmp;
}
char *SongList::getName(int id)
{
Song *tmp=getSongid(id);
if (tmp!=NULL) return tmp->name;
return NULL;
}
/*
void SongList::saveList(FILE *fh)
{
Song *ptr=list;
while (ptr!=NULL)
{
fputs(fh,ptr->name);
ptr=ptr->next;
}
}
*/
void SongList::iteratorStart(void)
{
it=list;
}
void SongList::iteratorNext(void)
{
if (it!=NULL) it=it->next;
}
int SongList::getIteratorID(void)
{
if (it==NULL) return -1;
return it->id;
}
char *SongList::getIteratorName(void)
{
if (it==NULL) return NULL;
return it->name;
}
void SongList::clean(void)
{
Song *tmp=list;
active=last=NULL;
ntotal=0;
while (tmp!=NULL)
{
list=tmp->next;
delete [] tmp->name;
delete tmp;
tmp=list;
}
}
void SongList::copy(SongList &src)
{
clean();
src.iteratorStart();
while (!src.iteratorAtEnd())
{
AddSong(src.getIteratorName());
src.iteratorNext();
}
if (src.active!=NULL) active=getSongid(src.active->id);
}
int SongList::next(void)
{
if (list==NULL) {active=NULL;return 0;};
if (active!=NULL) active=active->next;
if (active==NULL)
{
Song *tmp=list;
while (tmp->next!=NULL) tmp=tmp->next;
active=tmp;
return 0;
}
return 1;
}
void SongList::previous(void)
{
if (list==NULL) {active=NULL;return;};
Song *tmp=list;
while ((tmp->next!=NULL)&&(tmp->next->id!=active->id)) tmp=tmp->next;
if (tmp->next==NULL) {active=list;return;};
active=tmp;
}
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