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nsStreamConverterService.h
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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00015  * The Original Code is mozilla.org code.
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00037 
00038 #ifndef __nsstreamconverterservice__h___
00039 #define __nsstreamconverterservice__h___
00040 
00041 #include "nsIStreamConverterService.h"
00042 #include "nsIStreamListener.h"
00043 #include "nsHashtable.h"
00044 #include "nsCOMArray.h"
00045 #include "nsIAtom.h"
00046 
00047 class nsStreamConverterService : public nsIStreamConverterService {
00048 public:    
00050     // nsISupports methods
00051     NS_DECL_ISUPPORTS
00052 
00053 
00055     // nsIStreamConverterService methods
00056     NS_DECL_NSISTREAMCONVERTERSERVICE
00057 
00059     // nsStreamConverterService methods
00060     nsStreamConverterService();
00061     virtual ~nsStreamConverterService();
00062 
00063     // Initialization routine. Must be called after this object is constructed.
00064     nsresult Init();
00065 
00066 private:
00067     // Responsible for finding a converter for the given MIME-type.
00068     nsresult FindConverter(const char *aContractID, nsCStringArray **aEdgeList);
00069     nsresult BuildGraph(void);
00070     nsresult AddAdjacency(const char *aContractID);
00071     nsresult ParseFromTo(const char *aContractID, nsCString &aFromRes, nsCString &aToRes);
00072 
00073     // member variables
00074     nsObjectHashtable              *mAdjacencyList;
00075 };
00076 
00078 // Breadth-First-Search (BFS) algorithm state classes and types.
00079 
00080 // used  to establish discovered vertecies.
00081 enum BFScolors {white, gray, black};
00082 
00083 struct BFSState {
00084     BFScolors   color;
00085     PRInt32     distance;
00086     nsCStringKey  *predecessor;
00087     ~BFSState() {
00088         delete predecessor;
00089     }
00090 };
00091 
00092 // adjacency list and BFS hashtable data class.
00093 struct SCTableData {
00094     nsCStringKey *key;
00095     union _data {
00096         BFSState *state;
00097         nsCOMArray<nsIAtom> *edges;
00098     } data;
00099 
00100     SCTableData(nsCStringKey* aKey) : key(aKey) {
00101         data.state = nsnull;
00102     }
00103 };
00104 #endif // __nsstreamconverterservice__h___