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//--------------------------------------------------------------------
// Microsoft OLE-DB Monarch
//
// Copyright 1997 Microsoft Corporation. All Rights Reserved.
//
// @doc
//
// @module colname.cpp |
//
// Contains utility functions for maintaining property lists (symbol table?)
//
// @rev 0 | 12-Feb-97 | v-charca | Created
// 1 | 24-Oct-98 | danleg | cleanup
//
#pragma hdrstop
#include "msidxtr.h"
const BYTE randomNumbers[] = { // Pseudorandom Permutation of the Integers 0 through 255: CACM 33 6 p678
1, 87, 49, 12, 176, 178, 102, 166, 121, 193, 6, 84, 249, 230, 44, 163, 14, 197, 213, 181, 161, 85, 218, 80, 64, 239, 24, 226, 236, 142, 38, 200, 110, 177, 104, 103, 141, 253, 255, 50, 77, 101, 81, 18, 45, 96, 31, 222, 25, 107, 190, 70, 86, 237, 240, 34, 72, 242, 20, 214, 244, 227, 149, 235, 97, 234, 57, 22, 60, 250, 82, 175, 208, 5, 127, 199, 111, 62, 135, 248, 174, 169, 211, 58, 66, 154, 106, 195, 245, 171, 17, 187, 182, 179, 0, 243, 132, 56, 148, 75, 128, 133, 158, 100, 130, 126, 91, 13, 153, 246, 216, 219, 119, 68, 223, 78, 83, 88, 201, 99, 122, 11, 92, 32, 136, 114, 52, 10, 138, 30, 48, 183, 156, 35, 61, 26, 143, 74, 251, 94, 129, 162, 63, 152, 170, 7, 115, 167, 241, 206, 3, 150, 55, 59, 151, 220, 90, 53, 23, 131, 125, 173, 15, 238, 79, 95, 89, 16, 105, 137, 225, 224, 217, 160, 37, 123, 118, 73, 2, 157, 46, 116, 9, 145, 134, 228, 207, 212, 202, 215, 69, 229, 27, 188, 67, 124, 168, 252, 42, 4, 29, 108, 21, 247, 19, 205, 39, 203, 233, 40, 186, 147, 198, 192, 155, 33, 164, 191, 98, 204, 165, 180, 117, 76, 140, 36, 210, 172, 41, 54, 159, 8, 185, 232, 113, 196, 231, 47, 146, 120, 51, 65, 28, 144, 254, 221, 93, 189, 194, 139, 112, 43, 71, 109, 184, 209 };
//-----------------------------------------------------------------------------
// @mfunc Constructor
//
// @side No designed side effects.
//
//-----------------------------------------------------------------------------
CPropertyList::CPropertyList( CPropertyList** ppGlobalPropertyList // in | caller's property list
) : m_aBucket( 47 ), // number of hash buckets (PRIME!)
m_cMaxBucket( 47 ), m_ppGlobalPropertyList( ppGlobalPropertyList ){ RtlZeroMemory( m_aBucket.Get(), m_aBucket.SizeOf() );}
//-----------------------------------------------------------------------------
// @mfunc Constructor
//
// @side No designed side effects.
//
//-----------------------------------------------------------------------------
CPropertyList::~CPropertyList(){ // delete the hash table
for (int i=0; i<m_cMaxBucket; i++) { tagHASHENTRY* pHashEntry = m_aBucket[i]; tagHASHENTRY* pNextHashEntry = NULL; while (NULL != pHashEntry) { delete [] pHashEntry->wcsFriendlyName; if ( DBKIND_GUID_NAME == pHashEntry->dbCol.eKind ) delete [] pHashEntry->dbCol.uName.pwszName; pNextHashEntry = pHashEntry->pNextHashEntry; delete [] pHashEntry; pHashEntry = pNextHashEntry; } }}
/* Hashing function described in *//* "Fast Hashing of Variable-Length Text Strings," *//* by Peter K. Pearson, CACM, June 1990. */
inline UINT CPropertyList::GetHashValue( LPWSTR wszPropertyName //@parm IN | character string to hash
){ int iHash = 0; char *szPropertyName = (char*) wszPropertyName; int cwch = wcslen(wszPropertyName)*2; for (int i=0; i<cwch; i++) iHash ^= randomNumbers[*szPropertyName++]; return iHash % m_cMaxBucket;}
//-----------------------------------------------------------------------------
// @mfunc
//
// Method to create a property table to be used in a CITextToSelectTree call
// (passthrough query). The global and local properties need to be stuffed
// into a nice contiguous array.
//
// @side None
// @rdesc CIPROPERTYDEF*
//-----------------------------------------------------------------------------
CIPROPERTYDEF* CPropertyList::GetPropertyTable( UINT * pcSize // @parm out | size of property table
){ *pcSize = 0; for (int i=0; i<m_cMaxBucket; i++) { tagHASHENTRY* pHashEntry = (*m_ppGlobalPropertyList)->m_aBucket[i]; while (NULL != pHashEntry) { pHashEntry = pHashEntry->pNextHashEntry; (*pcSize)++; } }
for (i=0; i<m_cMaxBucket; i++) { tagHASHENTRY* pHashEntry = m_aBucket[i]; while (NULL != pHashEntry) { pHashEntry = pHashEntry->pNextHashEntry; (*pcSize)++; } }
XArray<CIPROPERTYDEF> xCiPropTable( *pcSize );
TRY { RtlZeroMemory( xCiPropTable.Get(), xCiPropTable.SizeOf() );
*pcSize = 0; for ( i=0; i<m_cMaxBucket; i++ ) { tagHASHENTRY* pHashEntry = (*m_ppGlobalPropertyList)->m_aBucket[i]; while ( NULL != pHashEntry ) { xCiPropTable[*pcSize].wcsFriendlyName = CopyString( pHashEntry->wcsFriendlyName ); xCiPropTable[*pcSize].dbType = pHashEntry->dbType; xCiPropTable[*pcSize].dbCol = pHashEntry->dbCol;
if ( DBKIND_GUID_NAME == pHashEntry->dbCol.eKind ) xCiPropTable[*pcSize].dbCol.uName.pwszName = CopyString( pHashEntry->dbCol.uName.pwszName ); else xCiPropTable[*pcSize].dbCol.uName.pwszName = pHashEntry->dbCol.uName.pwszName;
pHashEntry = pHashEntry->pNextHashEntry; (*pcSize)++; } }
for (i=0; i<m_cMaxBucket; i++) { tagHASHENTRY* pHashEntry = m_aBucket[i]; while (NULL != pHashEntry) { xCiPropTable[*pcSize].wcsFriendlyName = CopyString( pHashEntry->wcsFriendlyName ); xCiPropTable[*pcSize].dbType = pHashEntry->dbType; xCiPropTable[*pcSize].dbCol = pHashEntry->dbCol;
if ( DBKIND_GUID_NAME == pHashEntry->dbCol.eKind ) xCiPropTable[*pcSize].dbCol.uName.pwszName = CopyString( pHashEntry->dbCol.uName.pwszName ); else xCiPropTable[*pcSize].dbCol.uName.pwszName = pHashEntry->dbCol.uName.pwszName;
pHashEntry = pHashEntry->pNextHashEntry; (*pcSize)++; } } } CATCH( CException, e ) { // free the table
for ( unsigned i=0; i<xCiPropTable.Count(); i++ ) { delete [] xCiPropTable[i].wcsFriendlyName; if ( DBKIND_GUID_NAME == xCiPropTable[i].dbCol.eKind ) delete [] xCiPropTable[i].dbCol.uName.pwszName; }
RETHROW(); } END_CATCH
return xCiPropTable.Acquire();}
//-----------------------------------------------------------------------------
// @mfunc
//
// Method to delete a property table used in a CITextToSelectTree call
// (passthrough query).
//
// @side None
// @rdesc HRESULT
//-----------------------------------------------------------------------------
void CPropertyList::DeletePropertyTable( CIPROPERTYDEF* pCiPropTable, // @parm in | property table to be deleted
UINT cSize // @parm in | size of property table
){ for ( UINT i=0; i<cSize; i++ ) { delete [] pCiPropTable[i].wcsFriendlyName; if ( DBKIND_GUID_NAME == pCiPropTable[i].dbCol.eKind ) delete [] pCiPropTable[i].dbCol.uName.pwszName; } delete pCiPropTable;}
//-----------------------------------------------------------------------------
// @mfunc
//
// Method to retrieve the pointer to the CIPROPERTYDEF element
// associated with this wszPropertyName, or NULL if name is
// not in the table
//
// @side None
// @rdesc CIPROPERDEF*
//-----------------------------------------------------------------------------
HASHENTRY *CPropertyList::FindPropertyEntry( LPWSTR wszPropertyName, UINT *puHashValue ){ HASHENTRY *pHashEntry = NULL;
*puHashValue = GetHashValue(wszPropertyName); for (pHashEntry = m_aBucket[*puHashValue]; pHashEntry; pHashEntry = pHashEntry->pNextHashEntry) { if ( (*puHashValue==pHashEntry->wHashValue) && (_wcsicmp(wszPropertyName, pHashEntry->wcsFriendlyName)==0) ) return pHashEntry; } return NULL;}
//-----------------------------------------------------------------------------
// @mfunc
//
// Method to retrieve the pointer to the CIPROPERTYDEF element
// associated with this wszPropertyName, or NULL if name is
// not in the table
//
// @side None
// @rdesc CIPROPERDEF*
//-----------------------------------------------------------------------------
HASHENTRY *CPropertyList::GetPropertyEntry( LPWSTR wszPropertyName, UINT *puHashValue ){ HASHENTRY *pHashEntry = NULL;
if ( 0 != m_ppGlobalPropertyList && 0 != *m_ppGlobalPropertyList ) { pHashEntry = (*m_ppGlobalPropertyList)->FindPropertyEntry( wszPropertyName, puHashValue ); if ( 0 != pHashEntry ) return pHashEntry; }
pHashEntry = FindPropertyEntry( wszPropertyName, puHashValue ); return pHashEntry;}
//--------------------------------------------------------------------
// @mfunc
//
// Method to retrieve the pointer to the CIPROPERTYDEF element
// associated with this wszPropertyName, or NULL if name is
// not in the table
//
// @side None
// @rdesc HRESULT
// S_OK successfull operation
// E_FAIL property isn't defined
// E_INVALIDARG ppct or pdbType was null
// E_OUTOFMEMORY just what it says
//--------------------------------------------------------------------
HRESULT CPropertyList::LookUpPropertyName( LPWSTR wszPropertyName, // @parm IN
DBCOMMANDTREE** ppct, // @parm OUT
DBTYPE* pdbType // @parm OUT
){ UINT uHashValue; if ( 0 == ppct || 0 == pdbType) return E_INVALIDARG;
HASHENTRY *pHashEntry = GetPropertyEntry(wszPropertyName, &uHashValue); if ( 0 != pHashEntry ) { *pdbType = (DBTYPE)pHashEntry->dbType; *ppct = PctCreateNode(DBOP_column_name, DBVALUEKIND_ID, NULL); if ( 0 != *ppct ) { (*ppct)->value.pdbidValue->eKind = pHashEntry->dbCol.eKind; (*ppct)->value.pdbidValue->uGuid.guid = pHashEntry->dbCol.uGuid.guid; if ( DBKIND_GUID_NAME == pHashEntry->dbCol.eKind ) (*ppct)->value.pdbidValue->uName.pwszName = CoTaskStrDup( pHashEntry->dbCol.uName.pwszName ); else { Assert( DBKIND_GUID_PROPID == pHashEntry->dbCol.eKind ); (*ppct)->value.pdbidValue->uName.pwszName = pHashEntry->dbCol.uName.pwszName; } return S_OK; } else return E_OUTOFMEMORY; } else return E_FAIL;}
//-----------------------------------------------------------------------------
// @func SetPropertyEntry
//
// Insert the specified property into the symbol table.
// If it is already there, redefine its value.
//
// @rdesc HRESULT
// @flag S_OK | ok
// @flag E_OUTOFMEMORY | out of memory
//-----------------------------------------------------------------------------
HRESULT CPropertyList::SetPropertyEntry( LPWSTR wcsFriendlyName, // @parm IN | name of property
DWORD dbType, // @parm IN | dbtype of property
GUID guid, // @parm IN | GUID defining the property
DBKIND eKind, // @parm IN | type of PropId (currently GUID_NAME or GUID_PROPID)
LPWSTR pwszPropName, // @parm IN | either a name or propid
BOOL fGlobal ) // @parm IN | TRUE if global definition; FALSE if local
{ SCODE sc = S_OK;
TRY { UINT uhash=0; HASHENTRY* pHashEntry = GetPropertyEntry(wcsFriendlyName, &uhash);
if ( 0 != pHashEntry ) { // Redefining a user defined property.
// Delete the old property definition.
if ( DBKIND_GUID_NAME == pHashEntry->dbCol.eKind ) { XPtrST<WCHAR> xName( CopyString(pwszPropName) ); delete [] pHashEntry->dbCol.uName.pwszName; pHashEntry->dbCol.uName.pwszName = xName.Acquire(); }
pHashEntry->dbType = dbType; pHashEntry->dbCol.uGuid.guid = guid; pHashEntry->dbCol.eKind = eKind; } else { XPtr<HASHENTRY> xHashEntry( new HASHENTRY ); xHashEntry->wHashValue = uhash; XPtrST<WCHAR> xName( CopyString(wcsFriendlyName) ); xHashEntry->dbType = dbType; xHashEntry->dbCol.uGuid.guid = guid; xHashEntry->dbCol.eKind = eKind;
if ( DBKIND_GUID_NAME == eKind ) xHashEntry->dbCol.uName.pwszName = CopyString( pwszPropName ); else xHashEntry->dbCol.uName.pwszName = pwszPropName;
xHashEntry->wcsFriendlyName = xName.Acquire();
xHashEntry->pNextHashEntry = m_aBucket[uhash]; // Add to head of singly-linked list
m_aBucket[uhash] = xHashEntry.Acquire(); } } CATCH( CException, e ) { sc = e.GetErrorCode(); } END_CATCH
return sc;} // SetPropertyEntry
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