1 /*

     2  * Copyright (C) 2007, 2009 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  *

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

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

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

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

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

    13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

    14  *     its contributors may be used to endorse or promote products derived

    15  *     from this software without specific prior written permission. 

    16  *

    17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

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

    19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

    20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

    21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

    22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

    23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

    24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

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

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

    27  */

    28 

    29 #ifndef WorkQueueItem_h

    30 #define WorkQueueItem_h

    31 

    32 #include <JavaScriptCore/JSRetainPtr.h>

    33 #include <JavaScriptCore/JSBase.h>

    34 

    35 class WorkQueueItem {

    36 public:

    37     virtual ~WorkQueueItem() { }

    38     virtual bool invoke() const = 0; // Returns true if this started a load.

    39 };

    40 

    41 class LoadItem : public WorkQueueItem {

    42 public:

    43     LoadItem(const JSStringRef url, const JSStringRef target)

    44         : m_url(url)

    45         , m_target(target)

    46     {

    47     }

    48 

    49 private:

    50     virtual bool invoke() const;

    51 

    52     JSRetainPtr<JSStringRef> m_url;

    53     JSRetainPtr<JSStringRef> m_target;

    54 };

    55 

    56 class LoadHTMLStringItem : public WorkQueueItem {

    57 public:

    58     LoadHTMLStringItem(const JSStringRef content, const JSStringRef baseURL)

    59         : m_content(content)

    60         , m_baseURL(baseURL)

    61     {

    62     }

    63 

    64 private:

    65     virtual bool invoke() const;

    66 

    67     JSRetainPtr<JSStringRef> m_content;

    68     JSRetainPtr<JSStringRef> m_baseURL;

    69 };

    70 

    71 class ReloadItem : public WorkQueueItem {

    72 private:

    73     virtual bool invoke() const;

    74 };

    75 

    76 class ScriptItem : public WorkQueueItem {

    77 protected:

    78     ScriptItem(const JSStringRef script)

    79         : m_script(script)

    80     {

    81     }

    82 

    83 protected:

    84     virtual bool invoke() const;

    85 

    86 private:

    87     JSRetainPtr<JSStringRef> m_script;

    88 };

    89 

    90 class LoadingScriptItem : public ScriptItem {

    91 public:

    92     LoadingScriptItem(const JSStringRef script)

    93         : ScriptItem(script)

    94     {

    95     }

    96 

    97 private:

    98     virtual bool invoke() const { return ScriptItem::invoke(); }

    99 };

   100 

   101 class NonLoadingScriptItem : public ScriptItem {

   102 public:

   103     NonLoadingScriptItem(const JSStringRef script)

   104         : ScriptItem(script)

   105     {

   106     }

   107 

   108 private:

   109     virtual bool invoke() const { ScriptItem::invoke(); return false; }

   110 };

   111 

   112 class BackForwardItem : public WorkQueueItem {

   113 protected:

   114     BackForwardItem(int howFar)

   115         : m_howFar(howFar)

   116     {

   117     }

   118 

   119 private:

   120     virtual bool invoke() const;

   121 

   122     int m_howFar;

   123 };

   124 

   125 class BackItem : public BackForwardItem {

   126 public:

   127     BackItem(unsigned howFar)

   128         : BackForwardItem(-howFar)

   129     {

   130     }

   131 };

   132 

   133 class ForwardItem : public BackForwardItem {

   134 public:

   135     ForwardItem(unsigned howFar)

   136         : BackForwardItem(howFar)

   137     {

   138     }

   139 };

   140 

   141 #endif // !defined(WorkQueueItem_h)