FBReader Code Analysis: When creating Bookmodel, how to get the corresponding Formatplugin according to book?

This article is only for the moment I look at the code process memo records, not detailed collation, the organization is not too clear.

Bookmodel-Createmodel (book book);

Getplugin (Zlfile), book-Getplugin (), is actually obtained by the Plugincollection class:

Plugincollection, Getplugin (Zlfile), Getplugin (file, FormatPlugin.Type.ANY)

   Formatplugin getplugin (zlfile file, Formatplugin.type formattype) {final FileType FileType  = FileTypeCollection.Instance.typeForFile (file);        Final Formatplugin plugin  = Getplugin (FileType, formattype);  if  (plugin! = null  && Plugin.type () == FormatPlugin.Type.EXTERNAL) { return  File = = File.getphysicalfile ()?        Plugin: null   return   plugin; }

The Filetypecollection class initializes all acceptable file types:filetypecollection

/** * Store the value for key,filetype with filetype ID */private final TREEMAP<String, FileType>Mytypes = new TreeMap<String, FileType>();        Private Filetypecollection () {AddType (New FileTypeFB2 ());        AddType (New Filetypeepub ());        AddType (New Filetypemobipocket ());        AddType (New filetypehtml ());        AddType (New Simplefiletype ("Plain text", "TXT", mimetype.types_txt));        AddType (New Simplefiletype ("RTF", "RTF", Mimetype.types_rtf));        AddType (New Simplefiletype ("PDF", "PDF", mimetype.types_pdf));        AddType (New Filetypedjvu ());        AddType (New Simplefiletype ("Zip archive", "Zip", collections.singletonlist (Mimetype.app_zip)));    AddType (New Simplefiletype ("MS Word document", "Doc", Mimetype.types_doc)); The private void AddType (FileType type) {mytypes.put (type).    Id.tolowercase (), type); } public Collection<FileType>types () {return mytypes.values (); }    

These acceptable sets of file types include:

table 1: Supported filetype

FileType	Corresponding ID	The actual accepted file suffix (acceptsfile)	Mimetypes
FileTypeFB2	Fb2	. FB2,. Fb2.zip	Application/x-fictionbook, Application/x-fictionbook+xml, Application/fb2+xml, Text/fb2+xml, Application/fb2+zip
Filetypeepub	EPub	epub, Oebzip, Opf	Application/epub+zip, Application/epub
Filetypemobipocket	Mobipocket	PDB, PRC, Mobi, AZW3	Application/x-mobipocket-ebook
Filetypehtml	Html	HTML, HTM	Text/html, application/html, application/html+htm
Filetypedjvu	DjVu	DjVu, DJV	Image/vnd.djvu, Image/x-djvu, Application/djvu
Simplefiletype	Plain text	Txt	Text/plain, Application/txt
Simplefiletype	Rtf	Rtf	Application/rtf, Text/rtf
Simplefiletype	Pdf	Pdf	Application/pdf
Simplefiletype	ZIP Archive	Zip	Application/zip
Simplefiletype	MS Word Document	Doc	Application/msword, Application/doc

The FileType object supported by the Zlfile can be obtained according to the incoming zlfile: filetypecollection- typeforfile(zlfile file)

 Public FileType typeforfile (zlfile file)    {        for  (FileType type:types ()) {            if  (type.acceptsfile (file)) {                 return  type;            }        }         return NULL ;    }

The actual method of obtaining Formatplugin Plugincollection, Getplugin (FileType FileType, Formatplugin.type formattype)

 Publicformatplugin Getplugin (FileType FileType, Formatplugin.type formattype) {if(FileType = =NULL|| Formattype = =NULL) {            return NULL; }        Switch(formattype) { CaseAny : {formatplugin p = getplugin (FileType, FormatPlugin.Type.NATIVE);// Preferential access to native Formatplugin 
                 if (p = = null) {//loading Java formatplugin 
                   when not loaded    p = Getplugin (FileType, FormatPlugin.Type.JAVA); 
                 } 
                 if (p = = null) {//cannot be loaded again, Load extensions for Formatplugin 
                     p = Getplugin (FileType, FormatPlugin.Type.EXTERNAL); 
                 }            
                 return p; }            default:            {                Finallist<formatplugin> list =Myplugins.get (formattype); if(List = =NULL) {                    return NULL; }                 for(Formatplugin p:list) {
P.supportedfiletype () actually returns the Myfiletype that was passed in when the Formatplugin was initialized (see table 2);
The ID value of the filetype (viewed from table 1) will be matched on the myfiletype of formatplugin , matching the upper edge and returning the corresponding formatplugin                     if(FileType.Id.equalsIgnoreCase (P.supportedfiletype ())) {returnp; }                }                return NULL; }        }    }

1. First enter any by default, recursively enter again, carry formattype for FormatPlugin.Type.NATIVE , and then go to default.
2. Then it's up to the formattype to get list<formatplugin>. Now you need to know how the Myplugins is initialized? 

// ======================= The following code is the Myplugins initialization process =======================
Private final map<formatplugin.type,list<formatplugin>> myplugins =
New Hashmap<formatplugin.type,list<formatplugin>> ();

Public Staticplugincollection Instance () {if(Ourinstance = =NULL) {
All supported Formatplugin instances are initialized here
1.MobipocketPlugin-FormatPlugin.Type.Java
// 2.Djvuplugin -FormatPlugin.Type.EXTERNAL
3. pdfplugin - FormatPlugin.Type.EXTERNAL
Ourinstance=Newplugincollection ();
　　　　　　　//This code can isn't moved to constructor because Nativeplugins () is a native method             for(Nativeformatplugin p:ourinstance.nativeplugins ()) {ourinstance.addplugin (P); System.err.println ("Native plugin:" +p); }        }        returnourinstance; }Privateplugincollection () {Addplugin (NewMobipocketplugin ()); if(Build.VERSION.SDK_INT >= 8) {Addplugin (NewDjvuplugin ()); Addplugin (NewPdfplugin ()); }    }Private voidaddplugin (Formatplugin plugin) {FinalFormatplugin.type Type =Plugin.type (); List<FormatPlugin> list =myplugins.get (type); if(List = =NULL) {List=NewArraylist<formatplugin>();        Myplugins.put (type, list);    } list.add (plugin); }

Private void Nativeformatplugin[] Nativeplugins ();

Myplugins Stores all formatplugin of the corresponding Formatplugin.type with formatplugin.type as key.

All types of Formatplugin.type : Formatplugin, enum type:

 Public enum Type {Any        ,        JAVA,        NATIVE,        EXTERNAL;    };

Table 2: Supported Formatplugin

Some Formatplugin sub-class	The Myfiletype of this class	Its corresponding parent class	The type of the class
Builtinformatplugin (abstract)		Formatplugin (abstract)
Javaformatplugin (abstract)		Builtinformatplugin (abstract)	Type.java
Nativeformatplugin		Builtinformatplugin (abstract)	Type.native
Fb2nativeplugin	Fb2	Nativeformatplugin	Type.native
Oebnativeplugin	EPub	Nativeformatplugin	Type.native
Mobipocketplugin	Mobipocket	Javaformatplugin (abstract)	Type.java
Externalformatplugin (abstract)		Formatplugin (abstract)	Type.external
Djvuplugin	DjVu	Externalformatplugin (abstract)	Type.external
Pdfplugin	Pdf	Externalformatplugin (abstract)	Type.external

Open an EPUB resource example.epub, when the breakpoint enters, the following is the value of all filetype:

{DjVu=[email protected], epub=[email protected], FB2=[email protected], html= [email protected], Mobipocket=[email protected]a4e8, MS Word Document=Simplefiletype [MS Word Document], PDF=Simplefiletype [PDF], plain text=Simplefiletype [plain text], rtf=  Simplefiletype [RTF], zip archive=Simplefiletype [zip archive]}

Here are the values for all Formatplugin:

It can be seen that there are six types of formatplugin currently supported.
Therefore, the example.epub resource above, the corresponding filetype is epub=org.geometerplus.zlibrary.core.filetypes.filetypeepub[epub], Formatplugin is oebnativeplugin[epub].

  

FBReader Code Analysis: When creating Bookmodel, how to get the corresponding Formatplugin according to book?