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      1 /*
      2  * Copyright (C) 2013 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/html/LinkImport.h"
     33 
     34 #include "core/dom/Document.h"
     35 #include "core/html/HTMLImportLoader.h"
     36 #include "core/html/HTMLImportsController.h"
     37 #include "core/html/HTMLLinkElement.h"
     38 #include "core/loader/CrossOriginAccessControl.h"
     39 
     40 namespace WebCore {
     41 
     42 PassRefPtr<LinkImport> LinkImport::create(HTMLLinkElement* owner)
     43 {
     44     return adoptRef(new LinkImport(owner));
     45 }
     46 
     47 LinkImport::LinkImport(HTMLLinkElement* owner)
     48     : LinkResource(owner)
     49 {
     50 }
     51 
     52 LinkImport::~LinkImport()
     53 {
     54     clear();
     55 }
     56 
     57 Document* LinkImport::importedDocument() const
     58 {
     59     if (!m_loader)
     60         return 0;
     61     return m_loader->importedDocument();
     62 }
     63 
     64 void LinkImport::process()
     65 {
     66     if (m_loader)
     67         return;
     68     if (!m_owner)
     69         return;
     70     if (!m_owner->document()->frame() && !m_owner->document()->import())
     71         return;
     72 
     73     if (!m_owner->document()->import()) {
     74         ASSERT(m_owner->document()->frame()); // The document should be the master.
     75         HTMLImportsController::provideTo(m_owner->document());
     76     }
     77 
     78     LinkRequestBuilder builder(m_owner);
     79     if (!builder.isValid()) {
     80         didFinish();
     81         return;
     82     }
     83 
     84     HTMLImport* parent = m_owner->document()->import();
     85     HTMLImportsController* controller = parent->controller();
     86     m_loader = controller->createLoader(parent, builder.build(true));
     87     if (!m_loader) {
     88         didFinish();
     89         return;
     90     }
     91 
     92     m_loader->addClient(this);
     93 }
     94 
     95 void LinkImport::clear()
     96 {
     97     m_owner = 0;
     98 
     99     if (m_loader) {
    100         m_loader->removeClient(this);
    101         m_loader.clear();
    102     }
    103 }
    104 
    105 void LinkImport::ownerRemoved()
    106 {
    107     clear();
    108 }
    109 
    110 void LinkImport::didFinish()
    111 {
    112     if (!m_owner)
    113         return;
    114     m_owner->scheduleEvent();
    115 }
    116 
    117 bool LinkImport::hasLoaded() const
    118 {
    119     return m_loader && m_loader->isLoaded();
    120 }
    121 
    122 } // namespace WebCore
    123