1 /*

     2  * Copyright (C) 2007 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 void invoke() const = 0;

    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     const JSStringRef url() const { return m_url.get(); }

    50     const JSStringRef target() const { return m_target.get(); }

    51 

    52     virtual void invoke() const;

    53 

    54 private:

    55     JSRetainPtr<JSStringRef> m_url;

    56     JSRetainPtr<JSStringRef> m_target;

    57 };

    58 

    59 class ReloadItem : public WorkQueueItem {

    60 public:

    61     virtual void invoke() const;

    62 };

    63 

    64 class ScriptItem : public WorkQueueItem {

    65 public:

    66     ScriptItem(const JSStringRef script)

    67         : m_script(script)

    68     {

    69     }

    70 

    71     const JSStringRef script() const { return m_script.get(); }

    72 

    73     virtual void invoke() const;

    74 

    75 private:

    76     JSRetainPtr<JSStringRef> m_script;

    77 };

    78 

    79 class BackForwardItem : public WorkQueueItem {

    80 public:

    81     virtual void invoke() const;

    82 

    83 protected:

    84     BackForwardItem(int howFar)

    85         : m_howFar(howFar)

    86     {

    87     }

    88 

    89     int m_howFar;

    90 };

    91 

    92 class BackItem : public BackForwardItem {

    93 public:

    94     BackItem(unsigned howFar)

    95         : BackForwardItem(-howFar)

    96     {

    97     }

    98 };

    99 

   100 class ForwardItem : public BackForwardItem {

   101 public:

   102     ForwardItem(unsigned howFar)

   103         : BackForwardItem(howFar)

   104     {

   105     }

   106 };

   107 

   108 #endif // !defined(WorkQueueItem_h)