204 lines
5.2 KiB
C++
204 lines
5.2 KiB
C++
//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1997
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//
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// File: stemcf.cxx
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//
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// Contents: Stemmer class factory
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//
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// History: weibz, 10-Sep-1997 created
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//
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//--------------------------------------------------------------------------
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#include <pch.cxx>
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#include "stemcf.hxx"
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#include "stemmer.hxx"
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extern long gulcInstances;
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//+-------------------------------------------------------------------------
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//
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// Method: CStemmerCF::CStemmerCF
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//
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// Synopsis: Stemmer class factory constructor
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//
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//--------------------------------------------------------------------------
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CStemmerCF::CStemmerCF( LCID lcid )
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: _cRefs( 1 ), _lcid( lcid )
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{
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InterlockedIncrement( &gulcInstances );
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CStemmerCF::~CStemmerCF
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//
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// Synopsis: Stemmer class factory destructor
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//
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//--------------------------------------------------------------------------
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CStemmerCF::~CStemmerCF()
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{
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InterlockedDecrement( &gulcInstances );
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CStemmerCF::QueryInterface
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//
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// Synopsis: Rebind to other interface
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//
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// Arguments: [riid] -- IID of new interface
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// [ppvObject] -- New interface * returned here
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//
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// Returns: S_OK if bind succeeded, E_NOINTERFACE if bind failed
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//
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//--------------------------------------------------------------------------
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SCODE STDMETHODCALLTYPE CStemmerCF::QueryInterface( REFIID riid,
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void ** ppvObject )
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{
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//
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// Optimize QueryInterface by only checking minimal number of bytes.
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//
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// IID_IUnknown = 00000000-0000-0000-C000-000000000046
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// IID_IClassFactory = 00000001-0000-0000-C000-000000000046
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// --
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// |
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// +--- Unique!
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//
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Assert( (IID_IUnknown.Data1 & 0x000000FF) == 0x00 );
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Assert( (IID_IClassFactory.Data1 & 0x000000FF) == 0x01 );
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IUnknown *pUnkTemp;
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SCODE sc = S_OK;
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switch( riid.Data1 & 0x000000FF )
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{
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case 0x00:
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if ( riid == IID_IUnknown )
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pUnkTemp = (IUnknown *)this;
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else
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sc = E_NOINTERFACE;
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break;
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case 0x01:
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if ( riid == IID_IClassFactory )
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pUnkTemp = (IUnknown *)(IClassFactory *)this;
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else
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sc = E_NOINTERFACE;
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break;
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default:
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pUnkTemp = 0;
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sc = E_NOINTERFACE;
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break;
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}
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if( 0 != pUnkTemp )
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{
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*ppvObject = (void * )pUnkTemp;
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pUnkTemp->AddRef();
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}
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else
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*ppvObject = 0;
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return(sc);
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CStemmerCF::AddRef
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//
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// Synopsis: Increments refcount
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//
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//--------------------------------------------------------------------------
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ULONG STDMETHODCALLTYPE CStemmerCF::AddRef()
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{
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return InterlockedIncrement( &_cRefs );
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CStemmerCF::Release
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//
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// Synopsis: Decrement refcount. Delete if necessary.
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//
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//--------------------------------------------------------------------------
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ULONG STDMETHODCALLTYPE CStemmerCF::Release()
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{
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unsigned long uTmp = InterlockedDecrement( &_cRefs );
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if ( 0 == uTmp )
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delete this;
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return(uTmp);
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CStemmerCF::CreateInstance
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//
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// Synopsis: Creates new CStemmer object
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//
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// Arguments: [pUnkOuter] -- 'Outer' IUnknown
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// [riid] -- Interface to bind
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// [ppvObject] -- Interface returned here
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//
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//--------------------------------------------------------------------------
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SCODE STDMETHODCALLTYPE CStemmerCF::CreateInstance( IUnknown * pUnkOuter,
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REFIID riid,
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void * * ppvObject )
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{
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CStemmer *pIUnk = 0;
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SCODE sc = S_OK;
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__try
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{
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pIUnk = new CStemmer( _lcid );
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sc = pIUnk->QueryInterface( riid , ppvObject );
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pIUnk->Release(); // Release extra refcount from QueryInterface
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}
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__except(1)
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{
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Assert( 0 == pIUnk );
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sc = E_UNEXPECTED;
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}
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return (sc);
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CStemmerCF::LockServer
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//
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// Synopsis: Force class factory to remain loaded
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//
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// Arguments: [fLock] -- TRUE if locking, FALSE if unlocking
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//
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// Returns: S_OK
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//
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//--------------------------------------------------------------------------
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SCODE STDMETHODCALLTYPE CStemmerCF::LockServer(BOOL fLock)
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{
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if(fLock)
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InterlockedIncrement( &gulcInstances );
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else
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InterlockedDecrement( &gulcInstances );
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return(S_OK);
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}
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