зеркало из https://github.com/mozilla/gecko-dev.git
109 строки
2.8 KiB
C++
109 строки
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator.
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*
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* The Initial Developer of the Original Code is Intel Corp.
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* Portions created by Intel Corp. are
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* Copyright (C) 1999, 1999 Intel Corp. All
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* Rights Reserved.
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*
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* Contributor(s): Yixiong Zou <yixiong.zou@intel.com>
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* Carl Wong <carl.wong@intel.com>
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*/
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/*
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* This file is part of filecache implementation.
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*
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* It implements a simple iterator for the database, see nsDBAccessor.
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*/
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#include "nsDBEnumerator.h"
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#include "nsDiskCacheRecord.h"
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nsDBEnumerator::nsDBEnumerator(nsIDBAccessor* aDB, nsNetDiskCache* aCache) :
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m_DB(aDB) ,
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m_DiskCache(aCache) ,
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m_tempEntry(0) ,
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m_tempEntry_length(0) ,
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m_CacheEntry(0) ,
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m_bReset(PR_TRUE)
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{
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NS_INIT_REFCNT();
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}
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nsDBEnumerator::~nsDBEnumerator()
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{
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NS_IF_RELEASE(m_CacheEntry) ;
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}
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//
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// Implement nsISupports methods
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//
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NS_IMPL_ISUPPORTS(nsDBEnumerator, NS_GET_IID(nsISimpleEnumerator))
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/////////////////////////////////////////////////////////////////
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// nsISimpleEnumerator methods
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NS_IMETHODIMP
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nsDBEnumerator::HasMoreElements(PRBool *_retval)
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{
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*_retval = PR_FALSE ;
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nsresult rv = m_DB->EnumEntry(&m_tempEntry, &m_tempEntry_length, m_bReset) ;
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if(NS_FAILED(rv)) {
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// do some error recovery
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m_DiskCache->DBRecovery() ;
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return rv ;
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}
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m_bReset = PR_FALSE ;
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if(m_tempEntry && m_tempEntry_length != 0)
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*_retval = PR_TRUE ;
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return NS_OK ;
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}
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// this routine does not create a new item by itself
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// Rather it reuses the item inside the object. So if you need to use the
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// item later, you have to
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// create a new item specifically, using copy constructor or some other dup
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// function. And don't forget to release it after you're done
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//
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NS_IMETHODIMP
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nsDBEnumerator::GetNext(nsISupports **_retval)
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{
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if(!m_CacheEntry) {
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m_CacheEntry = new nsDiskCacheRecord(m_DB, m_DiskCache) ;
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if(m_CacheEntry)
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NS_ADDREF(m_CacheEntry) ;
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else
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return NS_ERROR_OUT_OF_MEMORY ;
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}
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if(!_retval)
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return NS_ERROR_NULL_POINTER ;
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*_retval = nsnull ;
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nsresult rv = m_CacheEntry->RetrieveInfo(m_tempEntry, m_tempEntry_length) ;
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if(NS_FAILED(rv))
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return rv ;
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*_retval = NS_STATIC_CAST(nsISupports*, m_CacheEntry) ;
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NS_ADDREF(*_retval) ; // all good getter addref
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return NS_OK ;
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}
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