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// Licensed to The Open Group (TOG) under one or more contributor license
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// this work for additional information regarding copyright ownership.
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#ifndef Pegasus_SCMOStreamer_h
#define Pegasus_SCMOStreamer_h

#include <Pegasus/Common/Config.h>
#include <Pegasus/Common/ArrayInternal.h>
#include <Pegasus/Common/SCMO.h>
#include <Pegasus/Common/SCMOInstance.h>
#include <Pegasus/Common/CIMBuffer.h>
#include <Pegasus/Common/Array.h>

PEGASUS_NAMESPACE_BEGIN


struct SCMOResultionTable
{
    SCMOResultionTable():scmbptr(0),index(0) {};

    void* scmbptr;
    Uint32 index;
};


class PEGASUS_COMMON_LINKAGE SCMOStreamer
{
public:

    SCMOStreamer(CIMBuffer& out, Array<SCMOInstance>& x);

    // Writes the list of SCMOInstances stored in this instance of SCMOStreamer
    // to the output buffer, including their referenced Classes and Instances
    void serialize();

    // Reads a list of SCMOInstances from the input buffer and stores them in
    // this instance of SCMOStreamer, including their referenced Classes and
    // Instances
    bool deserialize();

private:



    // This function takes and instance and adds all of its external
    // references (SCMOClass and SCMOInstances) to the index tables
    // For referenced SCMOInstances, the function recusively calls itself.
    //
    // Returns the index position at which the class for this instance was
    // inserted in the class resolver table.
    Uint32 _appendToResolverTables(const SCMOInstance& inst);


    // This function adds the given instance to the instance resolver table,
    // which stores the connections between instances and their external
    // references.
    //
    // Returns the index position at which the instance was inserted in the
    // instance resolver table.
    Uint32 _appendToInstResolverTable(const SCMOInstance& inst, Uint32 idx);


    // Adds an instance to the class resolution table.
    // Also adds the class to the class table when neccessary
    //
    // Returns the index position at which the instance was inserted in the
    // instance resolver table.
    Uint32 _appendToClassResolverTable(const SCMOInstance& inst);


    // Add the SCMOClass for the given instance to the class table.
    // If the class already exists in the table, it returns the index position
    // for this class, otherwise appends the class at the end of the table
    // and returns the new index position of the class.
    Uint32 _appendToClassTable(const SCMOInstance& inst);

    void _putClasses();
    bool _getClasses();
    void _putInstances();
    bool _getInstances();


#ifdef PEGASUS_DEBUG
    void _dumpTables();
#endif

    // The Buffer for output streaming
    CIMBuffer& _buf;

    // The array of SCMOInstances to be streamed
    Array<SCMOInstance>& _scmoInstances;

    // Counters for the total number of classes and scmo instances
    // to be streamed. These counters increase during streaming process.
    Uint32 _ttlNumInstances;
    Uint32 _ttlNumClasses;

    // Index table used to resolve the absolute pointers to SCMOClasses
    // to a relative sequence number (index) in the stream
    Array<SCMOResultionTable> _clsResolverTable;

    // Index table used to resolve the absolute pointers to SCMOInstances
    // to a relative sequence number (index) in the stream
    Array<SCMOResultionTable> _instResolverTable;

    // Table of pointers to SCMOClasses to be streamed
    Array<const SCMBClass_Main*> _classTable;
};

PEGASUS_NAMESPACE_END

#endif /* Pegasus_SCMOStreamer_h */