///////////////////////////////////////////////////////////////////////////////
// DeleteChildArray
///////////////////////////////////////////////////////////////////////////////
void cHierDatabaseIter::DeleteChildArray() //throw (eArchive, eHierDatabase)
{
ASSERT( ! Done() );
ASSERT( CanDescend() );
cDebug d("cHierDatabaseIter::DeleteChildArray");
if( Done() )
{
d.TraceDetail("Attempt to DeleteChildArray() when Done() == true; returning\n");
return;
}
if( ! CanDescend() )
{
d.TraceDetail("Attempt to DeleteChildArray() when none exists; returning\n");
return;
}
//
// make sure that the child index is empty...
//
if( ! ChildArrayEmpty() )
{
ASSERT( false );
throw eHierDatabase( _T("Attempt to delete a child array that still has entries") );
}
//
// ok, no we can remove it...
//
mpDb->RemoveItem( cBlockRecordFile::tAddr( mIter->mChild.mBlockNum, mIter->mChild.mIndex ) );
mIter->mChild = cHierAddr();
util_RewriteObject( mpDb, &(*mIter), GetCurrentAddr() );
}
///////////////////////////////////////////////////////////////////////////////
// CreateChildArray
///////////////////////////////////////////////////////////////////////////////
void cHierDatabaseIter::CreateChildArray() //throw (eArchive, eHierDatabase)
{
ASSERT( ! Done() );
ASSERT( ! CanDescend() );
if( Done() )
{
throw eHierDatabase( _T("Attempt to call iter::CreateChildArray() when done is true"));
}
if( CanDescend() )
{
throw eHierDatabase( _T("Attempt to call iter::CreateChildArray() when child already exists"));
}
cHierArrayInfo newInfo;
cHierAddr infoAddr;
// write the new info
newInfo.mParent = mInfoAddr;
infoAddr = util_WriteObject( mpDb, &newInfo );
mIter->mChild = infoAddr;
//
// rewrite the current object, since its child info just changed
//
util_RewriteObject( mpDb, &(*mIter), GetCurrentAddr() );
}
///////////////////////////////////////////////////////////////////////////////
// AddChildArray
///////////////////////////////////////////////////////////////////////////////
void cDbDataSourceIter::AddChildArray() //throw (eError)
{
ASSERT( ! Done() );
ASSERT( ! CanDescend() );
mDbIter.CreateChildArray();
}
///////////////////////////////////////////////////////////////////////////////
// CanDeleteChildArray
///////////////////////////////////////////////////////////////////////////////
bool cHierDatabaseIter::ChildArrayEmpty()
{
ASSERT( ! Done() );
ASSERT( CanDescend() );
cHierArrayInfo info;
util_ReadObject ( mpDb, &info, mIter->mChild );
return ( info.mArray.IsNull() );
}
///////////////////////////////////////////////////////////////////////////////
// DeleteEntry
///////////////////////////////////////////////////////////////////////////////
void cHierDatabaseIter::DeleteEntry() //throw (eArchive, eHierDatabase)
{
ASSERT( ! Done() );
ASSERT( ! CanDescend() ); // this node can't have any children.
cDebug d("cHierDatabaseIter::DeleteEntry");
if( Done() )
{
d.TraceDetail("Attempt to DeleteEntry() when Done() == true; returning\n");
return;
}
if( CanDescend() )
{
throw eHierDatabase( _T("Attempt to delete an entry that still has children.\n"));
}
//
// first, we should set the previous node's next pointer...
//
cHierAddr curAddr = GetCurrentAddr();
if( mIter == mEntries.begin() )
{
// we are changing the info's mArray pointer
//
mInfo.mArray = mIter->mNext;
util_RewriteObject( mpDb, &mInfo, mInfoAddr );
}
else
{
// altering the previous node...
//
mIter--;
mIter->mNext = (mIter+1)->mNext;
util_RewriteObject( mpDb, &(*mIter), GetCurrentAddr() );
mIter++;
}
//
// now, delete the node from the file and from our array...
//
mpDb->RemoveItem( cBlockRecordFile::tAddr( curAddr.mBlockNum, curAddr.mIndex ) );
mIter = mEntries.erase(mIter);
}
///////////////////////////////////////////////////////////////////////////////
// Descend
///////////////////////////////////////////////////////////////////////////////
void cHierDatabaseIter::Descend()
{
ASSERT( CanDescend() );
//
// alter the cwd...
//
mCurPath.Push( mIter->mName );
LoadArrayAt ( mIter->mChild );
}
