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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:
~WorkQueueItem()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:
LoadItem(const JSStringRef url,const JSStringRef target)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:
LoadHTMLStringItem(const JSStringRef content,const JSStringRef baseURL)58     LoadHTMLStringItem(const JSStringRef content, const JSStringRef baseURL)
59         : m_content(content)
60         , m_baseURL(baseURL)
61     {
62     }
63 
LoadHTMLStringItem(const JSStringRef content,const JSStringRef baseURL,const JSStringRef unreachableURL)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:
ScriptItem(const JSStringRef script)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:
LoadingScriptItem(const JSStringRef script)100     LoadingScriptItem(const JSStringRef script)
101         : ScriptItem(script)
102     {
103     }
104 
105 private:
invoke()106     virtual bool invoke() const { return ScriptItem::invoke(); }
107 };
108 
109 class NonLoadingScriptItem : public ScriptItem {
110 public:
NonLoadingScriptItem(const JSStringRef script)111     NonLoadingScriptItem(const JSStringRef script)
112         : ScriptItem(script)
113     {
114     }
115 
116 private:
invoke()117     virtual bool invoke() const { ScriptItem::invoke(); return false; }
118 };
119 
120 class BackForwardItem : public WorkQueueItem {
121 protected:
BackForwardItem(int howFar)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:
BackItem(unsigned howFar)135     BackItem(unsigned howFar)
136         : BackForwardItem(-howFar)
137     {
138     }
139 };
140 
141 class ForwardItem : public BackForwardItem {
142 public:
ForwardItem(unsigned howFar)143     ForwardItem(unsigned howFar)
144         : BackForwardItem(howFar)
145     {
146     }
147 };
148 
149 #endif // !defined(WorkQueueItem_h)
150