SHOP_ClerkCache.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        SHOP_ClerkCacheEntry.h ( SHOP Library, C++)
 *
 * COMMENTS:    Classes used for allowing clerks to cache information.
 */

#ifndef __SHOP_ClerkCacheEntry__
#define __SHOP_ClerkCacheEntry__

#include "SHOP_API.h"
#include <OP/OP_Node.h>
#include <SYS/SYS_Hash.h>

class SHOP_Clerk;

class SHOP_API SHOP_ClerkCacheKey
{
public:
    SHOP_ClerkCacheKey(const SHOP_Clerk *clerk, OP_Node *shop, 
                       OP_Node *obj, OP_Node *sop)
    {
        myClerk = clerk;
        myShop = shop ? shop->getUniqueId() : -1;
        myObj  = obj  ? obj->getUniqueId()  : -1;
        mySop  = sop  ? sop->getUniqueId()  : -1;
        
        myHash = SYShash(myClerk);
        SYShashCombine(myHash, myShop);
        SYShashCombine(myHash, myObj);
        SYShashCombine(myHash, mySop);
    }

    bool operator==(const SHOP_ClerkCacheKey &key) const
    {
        return myClerk == key.myClerk && myShop == key.myShop &&
               myObj == key.myObj && mySop == key.mySop;
    }
    
    bool operator!=(const SHOP_ClerkCacheKey &key) const
    {
        return myClerk != key.myClerk || myShop != key.myShop ||
               myObj != key.myObj || mySop != key.mySop;
    }
    
    SYS_HashType hash() const { return myHash; }

private:
    const SHOP_Clerk    *myClerk;
    int                  myShop, myObj, mySop;
    SYS_HashType         myHash;
};

// boost.hash implementation
static inline std::size_t hash_value(const SHOP_ClerkCacheKey &key) { return key.hash(); }

class SHOP_API SHOP_ClerkCacheEntry {
public:
    // Common entry class so that SHOP_Node
             SHOP_ClerkCacheEntry();
    virtual ~SHOP_ClerkCacheEntry();
};

#endif