Home | History | Annotate | Download | only in dom 
      1 /*
      2  * Copyright (C) 2010 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
      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 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 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 #ifndef PendingScript_h
     27 #define PendingScript_h
     28 
     29 #include "core/fetch/ResourceClient.h"
     30 #include "core/fetch/ResourceOwner.h"
     31 #include "core/fetch/ScriptResource.h"
     32 #include "platform/heap/Handle.h"
     33 #include "wtf/PassRefPtr.h"
     34 #include "wtf/RefPtr.h"
     35 #include "wtf/text/TextPosition.h"
     36 
     37 namespace WebCore {
     38 
     39 class Element;
     40 class ScriptResource;
     41 
     42 // A container for an external script which may be loaded and executed.
     43 //
     44 // A ResourcePtr alone does not prevent the underlying Resource
     45 // from purging its data buffer. This class holds a dummy client open for its
     46 // lifetime in order to guarantee that the data buffer will not be purged.
     47 class PendingScript FINAL : public ResourceOwner<ScriptResource> {
     48     ALLOW_ONLY_INLINE_ALLOCATION();
     49 public:
     50     PendingScript()
     51         : m_watchingForLoad(false)
     52         , m_startingPosition(TextPosition::belowRangePosition())
     53     {
     54     }
     55 
     56     PendingScript(Element* element, ScriptResource* resource)
     57         : m_watchingForLoad(false)
     58         , m_element(element)
     59     {
     60         setScriptResource(resource);
     61     }
     62 
     63     PendingScript(const PendingScript& other)
     64         : ResourceOwner(other)
     65         , m_watchingForLoad(other.m_watchingForLoad)
     66         , m_element(other.m_element)
     67         , m_startingPosition(other.m_startingPosition)
     68     {
     69         setScriptResource(other.resource());
     70     }
     71 
     72     ~PendingScript();
     73 
     74     PendingScript& operator=(const PendingScript& other)
     75     {
     76         if (this == &other)
     77             return *this;
     78 
     79         m_watchingForLoad = other.m_watchingForLoad;
     80         m_element = other.m_element;
     81         m_startingPosition = other.m_startingPosition;
     82         this->ResourceOwner<ScriptResource, ResourceClient>::operator=(other);
     83 
     84         return *this;
     85     }
     86 
     87     TextPosition startingPosition() const { return m_startingPosition; }
     88     void setStartingPosition(const TextPosition& position) { m_startingPosition = position; }
     89 
     90     bool watchingForLoad() const { return m_watchingForLoad; }
     91     void setWatchingForLoad(bool b) { m_watchingForLoad = b; }
     92 
     93     Element* element() const { return m_element.get(); }
     94     void setElement(Element* element) { m_element = element; }
     95     PassRefPtrWillBeRawPtr<Element> releaseElementAndClear();
     96 
     97     void setScriptResource(ScriptResource*);
     98 
     99     virtual void notifyFinished(Resource*);
    100 
    101     void trace(Visitor*);
    102 
    103 private:
    104     bool m_watchingForLoad;
    105     RefPtrWillBeMember<Element> m_element;
    106     TextPosition m_startingPosition; // Only used for inline script tags.
    107 };
    108 
    109 }
    110 
    111 #endif
    112