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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 "CachedResourceClient.h"
30 #include "CachedResourceHandle.h"
31 #include <wtf/text/TextPosition.h>
32 #include <wtf/PassRefPtr.h>
33 
34 namespace WebCore {
35 
36 class CachedScript;
37 class Element;
38 
39 // A container for an external script which may be loaded and executed.
40 //
41 // A CachedResourceHandle alone does not prevent the underlying CachedResource
42 // from purging its data buffer. This class holds a dummy client open for its
43 // lifetime in order to guarantee that the data buffer will not be purged.
44 class PendingScript : public CachedResourceClient {
45 public:
PendingScript()46     PendingScript()
47         : m_watchingForLoad(false)
48         , m_startingPosition(TextPosition1::belowRangePosition())
49     {
50     }
51 
PendingScript(Element * element,CachedScript * cachedScript)52     PendingScript(Element* element, CachedScript* cachedScript)
53         : m_watchingForLoad(false)
54         , m_element(element)
55     {
56         setCachedScript(cachedScript);
57     }
58 
PendingScript(const PendingScript & other)59     PendingScript(const PendingScript& other)
60         : CachedResourceClient(other)
61         , m_watchingForLoad(other.m_watchingForLoad)
62         , m_element(other.m_element)
63         , m_startingPosition(other.m_startingPosition)
64     {
65         setCachedScript(other.cachedScript());
66     }
67 
68     ~PendingScript();
69 
70     PendingScript& operator=(const PendingScript& other)
71     {
72         if (this == &other)
73             return *this;
74 
75         m_watchingForLoad = other.m_watchingForLoad;
76         m_element = other.m_element;
77         m_startingPosition = other.m_startingPosition;
78         setCachedScript(other.cachedScript());
79 
80         return *this;
81     }
82 
startingPosition()83     TextPosition1 startingPosition() const { return m_startingPosition; }
setStartingPosition(const TextPosition1 & position)84     void setStartingPosition(const TextPosition1& position) { m_startingPosition = position; }
85 
watchingForLoad()86     bool watchingForLoad() const { return m_watchingForLoad; }
setWatchingForLoad(bool b)87     void setWatchingForLoad(bool b) { m_watchingForLoad = b; }
88 
element()89     Element* element() const { return m_element.get(); }
setElement(Element * element)90     void setElement(Element* element) { m_element = element; }
91     PassRefPtr<Element> releaseElementAndClear();
92 
93     CachedScript* cachedScript() const;
94     void setCachedScript(CachedScript*);
95 
96     virtual void notifyFinished(CachedResource*);
97 
98 private:
99     bool m_watchingForLoad;
100     RefPtr<Element> m_element;
101     TextPosition1 m_startingPosition; // Only used for inline script tags.
102     CachedResourceHandle<CachedScript> m_cachedScript;
103 };
104 
105 }
106 
107 #endif
108