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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 ReloadItem : public WorkQueueItem {
     57 private:
     58     virtual bool invoke() const;
     59 };
     60 
     61 class ScriptItem : public WorkQueueItem {
     62 protected:
     63     ScriptItem(const JSStringRef script)
     64         : m_script(script)
     65     {
     66     }
     67 
     68 protected:
     69     virtual bool invoke() const;
     70 
     71 private:
     72     JSRetainPtr<JSStringRef> m_script;
     73 };
     74 
     75 class LoadingScriptItem : public ScriptItem {
     76 public:
     77     LoadingScriptItem(const JSStringRef script)
     78         : ScriptItem(script)
     79     {
     80     }
     81 
     82 private:
     83     virtual bool invoke() const { return ScriptItem::invoke(); }
     84 };
     85 
     86 class NonLoadingScriptItem : public ScriptItem {
     87 public:
     88     NonLoadingScriptItem(const JSStringRef script)
     89         : ScriptItem(script)
     90     {
     91     }
     92 
     93 private:
     94     virtual bool invoke() const { ScriptItem::invoke(); return false; }
     95 };
     96 
     97 class BackForwardItem : public WorkQueueItem {
     98 protected:
     99     BackForwardItem(int howFar)
    100         : m_howFar(howFar)
    101     {
    102     }
    103 
    104 private:
    105     virtual bool invoke() const;
    106 
    107     int m_howFar;
    108 };
    109 
    110 class BackItem : public BackForwardItem {
    111 public:
    112     BackItem(unsigned howFar)
    113         : BackForwardItem(-howFar)
    114     {
    115     }
    116 };
    117 
    118 class ForwardItem : public BackForwardItem {
    119 public:
    120     ForwardItem(unsigned howFar)
    121         : BackForwardItem(howFar)
    122     {
    123     }
    124 };
    125 
    126 #endif // !defined(WorkQueueItem_h)
    127