root/Source/core/html/imports/HTMLImportChild.cpp

DEFINITIONS

1. m_client
2. wasAlreadyLoaded
3. startLoading
4. didFinish
5. didFinishLoading
6. importedDocument
7. importDestroyed
8. root
9. document
10. wasDetachedFromDocument
11. didFinishParsing
12. didRemoveAllPendingStylesheet
13. stateDidChange
14. ensureLoader
15. createLoader
16. shareLoader
17. isDone
18. hasLoader
19. ownsLoader
20. loaderHasError
21. setClient
22. clearClient
23. link
24. showThis

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "core/html/imports/HTMLImportChild.h"

#include "core/dom/Document.h"
#include "core/dom/custom/CustomElement.h"
#include "core/dom/custom/CustomElementMicrotaskImportStep.h"
#include "core/html/imports/HTMLImportChildClient.h"
#include "core/html/imports/HTMLImportLoader.h"

namespace WebCore {

HTMLImportChild::HTMLImportChild(Document& master, const KURL& url, SyncMode sync)
    : HTMLImport(sync)
    , m_master(master)
    , m_url(url)
    , m_customElementMicrotaskStep(0)
    , m_client(0)
{
    m_master.guardRef();
}

HTMLImportChild::~HTMLImportChild()
{
    // importDestroyed() should be called before the destruction.
    ASSERT(!m_loader);

    if (m_customElementMicrotaskStep) {
        // if Custom Elements were blocked, must unblock them before death
        m_customElementMicrotaskStep->importDidFinish();
        m_customElementMicrotaskStep = 0;
    }

    if (m_client)
        m_client->importChildWasDestroyed(this);

    m_master.guardDeref();
}

void HTMLImportChild::wasAlreadyLoaded()
{
    ASSERT(!m_loader);
    ASSERT(m_client);
    stateWillChange();
}

void HTMLImportChild::startLoading(const ResourcePtr<RawResource>& resource)
{
    ASSERT(!this->resource());
    ASSERT(!m_loader);

    if (isSync()) {
        ASSERT(!m_customElementMicrotaskStep);
        m_customElementMicrotaskStep = CustomElement::didCreateImport(this);
    }

    setResource(resource);

    // If the node is "document blocked", it cannot create HTMLImportLoader
    // even if there is no sharable one found, as there is possibility that
    // preceding imports load the sharable imports.
    // In that case preceding one should win because it comes first in the tree order.
    // See also didUnblockFromCreatingDocument().
    if (state().shouldBlockDocumentCreation())
        return;

    ensureLoader();
}

void HTMLImportChild::didFinish()
{
    if (m_client)
        m_client->didFinish();

    if (m_customElementMicrotaskStep) {
        m_customElementMicrotaskStep->importDidFinish();
        m_customElementMicrotaskStep = 0;
    }
}

void HTMLImportChild::didFinishLoading()
{
    clearResource();
    stateWillChange();
}

Document* HTMLImportChild::importedDocument() const
{
    if (!m_loader)
        return 0;
    return m_loader->importedDocument();
}

void HTMLImportChild::importDestroyed()
{
    if (parent())
        parent()->removeChild(this);
    if (m_loader) {
        m_loader->removeImport(this);
        m_loader.clear();
    }
}

HTMLImportRoot* HTMLImportChild::root()
{
    return parent() ? parent()->root() : 0;
}

Document* HTMLImportChild::document() const
{
    return (m_loader && m_loader->isOwnedBy(this)) ? m_loader->document() : 0;
}

void HTMLImportChild::wasDetachedFromDocument()
{
    // For imported documens this shouldn't be called because Document::m_import is
    // cleared before Document is destroyed by HTMLImportChild::importDestroyed().
    ASSERT_NOT_REACHED();
}

void HTMLImportChild::didFinishParsing()
{
    ASSERT(m_loader->isOwnedBy(this));
    m_loader->didFinishParsing();
}

void HTMLImportChild::didRemoveAllPendingStylesheet()
{
    ASSERT(m_loader->isOwnedBy(this));
    m_loader->didRemoveAllPendingStylesheet();
}

void HTMLImportChild::stateDidChange()
{
    HTMLImport::stateDidChange();

    // Once all preceding imports are loaded,
    // HTMLImportChild can decide whether it should load the import by itself
    // or it can share existing one.
    if (!state().shouldBlockDocumentCreation())
        ensureLoader();
    if (state().isReady())
        didFinish();
}

void HTMLImportChild::ensureLoader()
{
    if (m_loader)
        return;

    if (HTMLImportChild* found = root()->findLinkFor(m_url, this))
        shareLoader(found);
    else
        createLoader();
}

void HTMLImportChild::createLoader()
{
    ASSERT(!state().shouldBlockDocumentCreation());
    ASSERT(!m_loader);
    m_loader = HTMLImportLoader::create();
    m_loader->addImport(this);
    m_loader->startLoading(resource());
}

void HTMLImportChild::shareLoader(HTMLImportChild* loader)
{
    ASSERT(!m_loader);
    m_loader = loader->m_loader;
    m_loader->addImport(this);
    stateWillChange();
}

bool HTMLImportChild::isDone() const
{
    return m_loader && m_loader->isDone();
}

bool HTMLImportChild::hasLoader() const
{
    return m_loader;
}

bool HTMLImportChild::ownsLoader() const
{
    return m_loader && m_loader->isOwnedBy(this);
}

bool HTMLImportChild::loaderHasError() const
{
    return m_loader && m_loader->hasError();
}


void HTMLImportChild::setClient(HTMLImportChildClient* client)
{
    ASSERT(client);
    ASSERT(!m_client);
    m_client = client;
}

void HTMLImportChild::clearClient()
{
    // Doesn't check m_client nullity because we allow
    // clearClient() to reenter.
    m_client = 0;
}

HTMLLinkElement* HTMLImportChild::link() const
{
    if (!m_client)
        return 0;
    return m_client->link();
}

#if !defined(NDEBUG)
void HTMLImportChild::showThis()
{
    HTMLImport::showThis();
    fprintf(stderr, " loader=%p own=%s async=%s url=%s",
        m_loader.get(),
        hasLoader() && ownsLoader() ? "Y" : "N",
        isSync() ? "Y" : "N",
        url().string().utf8().data());
}
#endif

} // namespace WebCore