1 /*

     2  * Copyright (C) 2007 Apple Inc.  All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  * 1. Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

    24  */

    25 

    26 #include "config.h"

    27 

    28 #include "WebDocumentLoader.h"

    29 

    30 using namespace WebCore;

    31 

    32 WebDocumentLoader::WebDocumentLoader(const ResourceRequest& request, const SubstituteData& substituteData)

    33     : DocumentLoader(request, substituteData)

    34     , m_dataSource(0)

    35     , m_detachedDataSource(0)

    36 {

    37 }

    38 

    39 WebDocumentLoader::~WebDocumentLoader()

    40 {

    41     if (m_dataSource) {

    42         ASSERT(!m_detachedDataSource);

    43         m_dataSource->Release();

    44     }

    45 }

    46 

    47 void WebDocumentLoader::setDataSource(WebDataSource *dataSource)

    48 {

    49     ASSERT(!m_dataSource);

    50     m_dataSource = dataSource;

    51     if (m_dataSource)

    52         m_dataSource->AddRef();

    53 }

    54 

    55 WebDataSource* WebDocumentLoader::dataSource() const

    56 {

    57     return m_dataSource;

    58 }

    59 

    60 void WebDocumentLoader::detachDataSource()

    61 {

    62     // we only call detachDataSource when the WebDataSource is freed - and we won't get there if m_dataSource is not

    63     // null (because that would mean the loader still has a reference to the data source)

    64     ASSERT(!m_dataSource);

    65     m_detachedDataSource = 0;

    66 }

    67 

    68 void WebDocumentLoader::attachToFrame()

    69 {

    70     DocumentLoader::attachToFrame();

    71     if (m_detachedDataSource) {

    72         ASSERT(!m_dataSource);

    73         setDataSource(m_detachedDataSource);

    74         m_detachedDataSource = 0;

    75     }

    76 }

    77 

    78 void WebDocumentLoader::detachFromFrame()

    79 {

    80     DocumentLoader::detachFromFrame();

    81     m_detachedDataSource = m_dataSource;

    82     if (m_dataSource) {

    83         WebDataSource* dataSourceToBeReleased = m_dataSource;

    84         // It's important to null out m_dataSource before calling release on the data source.  That release can cause the data

    85         // source to be deleted - which ends up calling loader->detachDataSource() which makes the assumption that the loader no 

    86         // longer holds a reference to the data source.

    87         m_dataSource = 0;

    88         dataSourceToBeReleased->Release();

    89     }

    90 }