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      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     LoadHTMLStringItem(const JSStringRef content, const JSStringRef baseURL, const JSStringRef unreachableURL)
     65         : m_content(content)
     66         , m_baseURL(baseURL)
     67         , m_unreachableURL(unreachableURL)
     68     {
     69     }
     70 
     71 private:
     72     virtual bool invoke() const;
     73 
     74     JSRetainPtr<JSStringRef> m_content;
     75     JSRetainPtr<JSStringRef> m_baseURL;
     76     JSRetainPtr<JSStringRef> m_unreachableURL;
     77 };
     78 
     79 class ReloadItem : public WorkQueueItem {
     80 private:
     81     virtual bool invoke() const;
     82 };
     83 
     84 class ScriptItem : public WorkQueueItem {
     85 protected:
     86     ScriptItem(const JSStringRef script)
     87         : m_script(script)
     88     {
     89     }
     90 
     91 protected:
     92     virtual bool invoke() const;
     93 
     94 private:
     95     JSRetainPtr<JSStringRef> m_script;
     96 };
     97 
     98 class LoadingScriptItem : public ScriptItem {
     99 public:
    100     LoadingScriptItem(const JSStringRef script)
    101         : ScriptItem(script)
    102     {
    103     }
    104 
    105 private:
    106     virtual bool invoke() const { return ScriptItem::invoke(); }
    107 };
    108 
    109 class NonLoadingScriptItem : public ScriptItem {
    110 public:
    111     NonLoadingScriptItem(const JSStringRef script)
    112         : ScriptItem(script)
    113     {
    114     }
    115 
    116 private:
    117     virtual bool invoke() const { ScriptItem::invoke(); return false; }
    118 };
    119 
    120 class BackForwardItem : public WorkQueueItem {
    121 protected:
    122     BackForwardItem(int howFar)
    123         : m_howFar(howFar)
    124     {
    125     }
    126 
    127 private:
    128     virtual bool invoke() const;
    129 
    130     int m_howFar;
    131 };
    132 
    133 class BackItem : public BackForwardItem {
    134 public:
    135     BackItem(unsigned howFar)
    136         : BackForwardItem(-howFar)
    137     {
    138     }
    139 };
    140 
    141 class ForwardItem : public BackForwardItem {
    142 public:
    143     ForwardItem(unsigned howFar)
    144         : BackForwardItem(howFar)
    145     {
    146     }
    147 };
    148 
    149 #endif // !defined(WorkQueueItem_h)
    150