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winamp/Src/nde/osx/Table.cpp

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/* ---------------------------------------------------------------------------
Nullsoft Database Engine
--------------------
codename: Near Death Experience
--------------------------------------------------------------------------- */
/* ---------------------------------------------------------------------------
Table Class
Apple Mac OS X implementation
--------------------------------------------------------------------------- */
#include "../nde.h"
#include <stdio.h>
#include <string.h>
#include "../CRC.H"
const char *tSign="NDETABLE";
//---------------------------------------------------------------------------
Table::Table(const char *TableName, const char *Idx, BOOL Create, Database *_db, BOOL _Cached)
: columns_cached(false), use_row_cache(false), Scanner(this)
{
Handle = 0;
memset(column_ids, FIELD_UNKNOWN, 255);
Cached = _Cached;
db = _db;
AutoCreate = Create;
Name = strdup(TableName);
IdxName = strdup(Idx);
Init();
}
//---------------------------------------------------------------------------
void Table::Init()
{
numErrors = 0;
Scanners = new LinkedList();
// benski> cut: Handle=NULL;
IdxHandle=NULL;
FieldsRecord=NULL;
IndexList=NULL;
GLocateUpToDate = FALSE;
}
//---------------------------------------------------------------------------
Table::~Table()
{
Reset();
if (Handle) // Reset doesn't completely destroy Handle
Vfdestroy(Handle);
Handle = 0;
free(Name);
free(IdxName);
}
//---------------------------------------------------------------------------
void Table::Reset()
{
if (IndexList) IndexList->Release();
IndexList=0;
if (FieldsRecord) FieldsRecord->Release();
FieldsRecord=0;
delete Scanners;
Scanners=0;
if (Handle)
Vfclose(Handle); // close (but don't destroy) to keep mutex open.
if (IdxHandle)
Vfdestroy(IdxHandle);
IdxHandle = 0;
for (RowCache::iterator itr=rowCache.begin();itr!=rowCache.end();itr++)
{
if (itr->second)
itr->second->Release();
}
rowCache.clear();
memset(column_ids, FIELD_UNKNOWN, 255);
columns_cached=false;
}
struct IndexNewWalkerContext
{
IndexNewWalkerContext(Table *_table)
{
N = -1;
table = _table;
}
int N;
Table *table;
};
bool Table::IndexNewWalker(IndexRecord *record, Field *entry, void *context_in)
{
IndexNewWalkerContext *context = (IndexNewWalkerContext *)context_in;
IndexField *p = (IndexField *)entry;
p->index = new Index(context->table->IdxHandle, p->ID, context->N++, p->Type, FALSE, 0, context->table);
return true;
}
//---------------------------------------------------------------------------
BOOL Table::Open(void)
{
BOOL Valid;
int justcreated = 0;
if (!Handle)
Handle = Vfnew(Name, "r+b", Cached);
if (!Handle) return FALSE;
if (!Vflock(Handle))
{
Vfdestroy(Handle);
Handle = 0;
return FALSE;
}
Handle = Vfopen(Handle, Name, "r+b", Cached);
IdxHandle = Vfopen(0, IdxName, "r+b", TRUE);
Valid = (Handle && IdxHandle);
// unlock
if (Valid || !AutoCreate)
{
//if (Handle)
//Vfunlock(Handle);
}
else
{
if (Handle)
{
Vfclose(Handle);
if (IdxHandle)
Vfdestroy(IdxHandle);
IdxHandle = 0;
}
else
{
if (IdxHandle)
Vfdestroy(IdxHandle);
IdxHandle = 0;
Handle = Vfnew(Name, "w+b", Cached);
if (!Vflock(Handle))
{
Vfdestroy(Handle);
return FALSE;
}
}
Handle = Vfopen(Handle, Name, "w+b", Cached);
IdxHandle = Vfopen(0, IdxName, "w+b", TRUE);
Valid = (Handle && IdxHandle);
if (Valid)
{
Vfwrite(__TABLE_SIGNATURE__, strlen(__TABLE_SIGNATURE__), Handle);
Vfwrite(__INDEX_SIGNATURE__, strlen(__TABLE_SIGNATURE__), IdxHandle);
// TODO bensk> change if NUM_SPECIAL_RECORDS ever increases
int v=NUM_SPECIAL_RECORDS;//strlen(__TABLE_SIGNATURE__);
Vfwrite(&v, sizeof(v), IdxHandle);
// v = 0; fwrite(&v, sizeof(v), 1, IdxHandle);
v = -1; Vfwrite(&v, sizeof(v), IdxHandle); // write ID
v = 0;
for (int i=0;i<NUM_SPECIAL_RECORDS;i++)
{
Vfwrite(&v, sizeof(v), IdxHandle);
Vfwrite(&v, sizeof(v), IdxHandle);
}
Sync();
justcreated = 1;
}
}
if (!Valid)
{
if (Handle) Vfdestroy(Handle);
if (IdxHandle) Vfdestroy(IdxHandle);
Handle = NULL;
IdxHandle = NULL;
}
else
{
int Ptr;
char test1[9]={0,};
char test2[9]={0,};
Vfseek(Handle, 0, SEEK_SET);
Vfread(test1, strlen(__TABLE_SIGNATURE__), Handle);
Vfseek(IdxHandle, 0, SEEK_SET);
Vfread(test2, strlen(__INDEX_SIGNATURE__), IdxHandle);
test1[8]=0;
test2[8]=0;
if (strcmp(test1, __TABLE_SIGNATURE__) || strcmp(test2, __INDEX_SIGNATURE__))
{
if (Handle) Vfdestroy(Handle);
Handle = 0;
if (IdxHandle) Vfdestroy(IdxHandle);
IdxHandle = 0;
return FALSE;
}
// Load default index
IndexField *field;
field = new IndexField(PRIMARY_INDEX, -1, -1, CFSTR("None"));
field->index = new Index(IdxHandle, PRIMARY_INDEX, -1, -1, FALSE, 0, this);
// Get indexes
Ptr = field->index->Get(INDEX_RECORD_NUM);
IndexList = new IndexRecord(Ptr, INDEX_RECORD_NUM, Handle, this);
if (!IndexList)
{
delete field;
if (Handle) Vfdestroy(Handle);
Handle = 0;
if (IdxHandle) Vfdestroy(IdxHandle);
IdxHandle = 0;
return FALSE;
}
// Init them
IndexNewWalkerContext newContext(this);
IndexList->WalkFields(IndexNewWalker, &newContext);
// Add default in case its not there (if it is it won't be added by addfield)
IndexList->AddField(field);
// Get the default index (whether loaded or preloaded)
Scanner::index = ((IndexField*)IndexList->GetField(PRIMARY_INDEX))->index;
// If it's different from preloaded, delete preloaded
if (field->index != Scanner::index)
{
delete field;
field=0;
}
// Set up colaboration
IndexList->BuildCollaboration();
// Get columns
Ptr = Scanner::index->Get(FIELDS_RECORD_NUM);
FieldsRecord = new Record(Ptr, FIELDS_RECORD_NUM, Handle, this);
if (!FieldsRecord)
{
IndexList->Release();
IndexList=0;
if (Handle) Vfdestroy(Handle);
Handle = 0;
if (IdxHandle) Vfdestroy(IdxHandle);
IdxHandle = 0;
return FALSE;
}
// update the column cache
FieldsRecord->WalkFields(BuildColumnCache, this);
columns_cached=true;
}
#if 0 // TODO
if (Valid && !justcreated)
{
if (IndexList->NeedFix())
Compact();
}
#endif
if (Valid) First();
if (Handle)
Vfunlock(Handle);
return Valid;
}
//---------------------------------------------------------------------------
void Table::Close(void)
{
int v=0;
if (Handle && IndexList && Vflock(Handle, 0))
{
IndexList->WalkFields(IndexWriteWalker, 0);
}
delete Scanners;
Scanners = NULL;
Vsync(Handle);
if (IdxHandle)
{
Vfdestroy(IdxHandle);
IdxHandle = NULL;
v |= 2;
}
if (Handle)
{
Vfdestroy(Handle);
Handle = NULL;
v |= 1;
}
if (v != 3)
return;
}
bool Table::IndexWriteWalker(IndexRecord *record, Field *entry, void *context)
{
IndexField *field = (IndexField *)entry;
field->index->WriteIndex();
return true;
}
//---------------------------------------------------------------------------
void Table::Sync(void)
{
if (!Vflock(Handle))
return;
if (IndexList)
IndexList->WalkFields(IndexWriteWalker, 0);
int err=0;
if (!err && Handle) err|=Vsync(Handle);
if (!err && IdxHandle) err|=Vsync(IdxHandle);
Vfunlock(Handle);
}
//---------------------------------------------------------------------------
ColumnField *Table::NewColumn(unsigned char FieldID, CFStringRef FieldName, unsigned char FieldType, BOOL indexUnique)
{
columns_cached=false; // if they start writing new columns, kill the columns cache until they PostColumns()
ColumnField *f = GetColumnById(FieldID);
if (f) {
int t = f->GetDataType();
if (t != FieldType) {
if (CompatibleFields(t, FieldType))
{
f->SetDataType(FieldType);
goto aok;
}
}
return NULL;
}
aok:
if (GetColumnByName(FieldName))
return NULL;
ColumnField *field = new ColumnField(FieldID, FieldName, FieldType, this);
column_ids[FieldID]=FieldType;
FieldsRecord->AddField(field);
return field;
}
void Table::SetFieldSearchableById(unsigned char field_id, bool searchable)
{
ColumnField *column = GetColumnById(field_id);
if (column)
column->SetSearchable(searchable);
if (searchable)
{
search_fields.insert(field_id);
}
else
{
search_fields.erase(field_id);
}
}
//---------------------------------------------------------------------------
bool Table::BuildColumnCache(Record *record, Field *entry, void *context)
{
Table *table = (Table *)context;
ColumnField *column = (ColumnField *)entry;
unsigned char field_id=column->GetFieldId();
table->column_ids[field_id] = column->GetDataType();
if (column->IsSearchableField())
{
table->search_fields.insert(field_id);
}
else
{
table->search_fields.erase(field_id);
}
return true;
}
//---------------------------------------------------------------------------
void Table::PostColumns(void)
{
FieldsRecord->WriteFields(this, FIELDS_RECORD_NUM);
memset(column_ids, FIELD_UNKNOWN, 255);
FieldsRecord->WalkFields(BuildColumnCache, this);
columns_cached=true;
}
unsigned char Table::GetColumnType(unsigned char Id)
{
if (columns_cached)
{
return column_ids[Id];
}
else
{
return GetColumnById(Id)->GetDataType();
}
}
//---------------------------------------------------------------------------
IndexField *Table::GetIndexByName(CFStringRef name)
{
if (!IndexList)
return NULL;
return IndexList->GetIndexByName(name);
}
//---------------------------------------------------------------------------
IndexField *Table::GetIndexById(unsigned char Id)
{
if (!IndexList)
return NULL;
return (IndexField *)IndexList->GetField(Id);
}
//---------------------------------------------------------------------------
void Table::AddIndexByName(CFStringRef name, CFStringRef desc)
{
ColumnField *header = GetColumnByName(name);
if (header)
{
unsigned char Idx = header->ID;
AddIndexById(Idx, desc);
}
}
//---------------------------------------------------------------------------
void Table::AddIndexById(unsigned char Id, CFStringRef desc)
{
if (GetIndexById(Id)) return;
ColumnField *col = GetColumnById(Id);
if (!col)
return;
IndexField *newindex = new IndexField(Id, IndexList->GetColumnCount(), col->GetDataType(), desc);
newindex->index = new Index(IdxHandle, Id, IndexList->GetColumnCount(), col->GetDataType(), TRUE, Scanner::index->NEntries, this);
IndexList->AddField(newindex);
IndexField *previous = (IndexField *)newindex->prev;
previous->index->Colaborate(newindex);
IndexField *primary_index = (IndexField *)IndexList->GetField(PRIMARY_INDEX);
newindex->index->Colaborate(primary_index);
previous->index->Propagate();
IndexList->WriteFields(this);
}
//---------------------------------------------------------------------------
BOOL Table::CheckIndexing(void)
{
if (IndexList->GetColumnCount() == 0) return TRUE;
for (int i=0;i<Scanner::index->NEntries;i++)
{
if (!IndexList->CheckIndexing(i))
return FALSE;
}
return TRUE;
}
struct IndexWalkerThunkContext
{
void *context;
Table *_this;
Table::IndexWalker callback;
};
bool Table::IndexWalkerThunk(IndexRecord *record, Field *entry, void *context_in)
{
IndexWalkerThunkContext *context = (IndexWalkerThunkContext *)context_in;
return context->callback(context->_this, (IndexField *)entry, context->context);
}
//---------------------------------------------------------------------------
void Table::WalkIndices(IndexWalker callback, void *context)
{
if (IndexList && callback)
{
IndexWalkerThunkContext walkerContext = { context, this, callback };
IndexList->WalkFields(IndexWalkerThunk, &walkerContext);
}
}
//---------------------------------------------------------------------------
void Table::DropIndex(IndexField *Ptr)
{
if (!Ptr || Ptr->Type != FIELD_INDEX) return;
if (Scanner::index == Ptr->index)
{
Scanner::index = ((IndexField*)IndexList->GetField(PRIMARY_INDEX))->index;
IndexList->BuildCollaboration();
}
IndexList->RemoveField(Ptr);
if (Scanner::index->SecIndex == Ptr)
Scanner::index->SecIndex = 0;
IndexList->SetModified(TRUE);
IndexList->WriteFields(this);
}
//---------------------------------------------------------------------------
void Table::DropIndexByName(CFStringRef desc)
{
IndexField *indx = GetIndexByName(desc);
if (CFStringCompare(desc, CFSTR("None"), kCFCompareCaseInsensitive) == kCFCompareEqualTo)
return;
if (indx)
DropIndex(indx);
}
//---------------------------------------------------------------------------
void Table::DropIndexById(unsigned char Id)
{
if (!IndexList)
return;
if (Id == (unsigned char)PRIMARY_INDEX) return;
IndexField *indx=(IndexField *)IndexList->GetField(Id);
if (indx)
DropIndex(indx);
}
//---------------------------------------------------------------------------
BOOL Table::LocateByIdEx(int Id, int From, Field *field, int comp_mode)
{
return Scanner::LocateByIdEx(Id, From, field, NULL, comp_mode);
}
//---------------------------------------------------------------------------
Record *Table::GetColumns(void)
{
if (!FieldsRecord)
return NULL;
return FieldsRecord;
}
//---------------------------------------------------------------------------
Scanner *Table::NewScanner()
{
Scanner *s = new Scanner(this);
/*if (Scanners->GetNElements() > 0)*/
s->index = Scanner::index;
Scanners->AddEntry(s, TRUE);
return s;
}
//---------------------------------------------------------------------------
Scanner *Table::GetDefaultScanner(void)
{
return this;
}
//---------------------------------------------------------------------------
void Table::DeleteScanner(Scanner *scan)
{
if (!scan) return;
Scanners->RemoveEntry(scan);
}
//---------------------------------------------------------------------------
void Table::IndexModified(void)
{
Scanner *s = (Scanner *)Scanners->GetHead();
while (s)
{
s->IndexModified();
s = (Scanner *)s->GetNext();
}
}
//---------------------------------------------------------------------------
void Table::SetGlobalLocateUpToDate(BOOL is) {
GLocateUpToDate = is;
}
ColumnField *Table::GetColumnById(unsigned char Idx)
{
if (!FieldsRecord)
return NULL;
return (ColumnField *)FieldsRecord->GetField(Idx);
}
ColumnField *Table::GetColumnByName(CFStringRef FieldName)
{
return FieldsRecord->GetColumnByName(FieldName);
}
void Table::RowCache_Delete(int position)
{
if (use_row_cache)
{
RowCache::iterator found = rowCache.find(position);
if (found != rowCache.end())
{
if (found->second)
found->second->Release();
rowCache.erase(found);
}
}
}
void Table::RowCache_Remove(int position)
{
if (use_row_cache)
{
Record *&row = rowCache[position];
if (row)
{
row->Release();
}
row = 0;
}
}
void Table::RowCache_Add(Record *record, int position)
{
if (use_row_cache)
{
record->Retain();
Record *&row = rowCache[position];
if (row)
{
row->Release();
}
row = record;
}
}
Record *Table::RowCache_Get(int position)
{
if (!use_row_cache)
return 0;
Record *row = rowCache[position];
if (row)
row->Retain();
return row;
}
void Table::EnableRowCache()
{
use_row_cache=true;
}
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