metadata.h

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/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
---------------------------------------------------------------------------

Copyright (c) 2006-2012, assimp team

All rights reserved.

Redistribution and use of this software in source and binary forms, 
with or without modification, are permitted provided that the following 
conditions are met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

* Neither the name of the assimp team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
---------------------------------------------------------------------------
*/

#ifndef __AI_METADATA_H_INC__
#define __AI_METADATA_H_INC__

#include <assert.h>

#if defined(_MSC_VER) && (_MSC_VER <= 1500)
#include "Compiler/pstdint.h"
#else
#include <stdint.h>
#endif



// -------------------------------------------------------------------------------
 // -------------------------------------------------------------------------------
typedef enum aiMetadataType
{
    AI_BOOL = 0, 
    AI_INT = 1, 
    AI_UINT64 = 2, 
    AI_FLOAT = 3, 
    AI_AISTRING = 4,
    AI_AIVECTOR3D = 5,

#ifndef SWIG
    FORCE_32BIT = INT_MAX
#endif
} aiMetadataType;



// -------------------------------------------------------------------------------
 // -------------------------------------------------------------------------------
struct aiMetadataEntry
{
    aiMetadataType mType;
    void* mData;
};



#ifdef __cplusplus

#include <string>



// -------------------------------------------------------------------------------
 // -------------------------------------------------------------------------------
inline aiMetadataType GetAiType( bool ) { return AI_BOOL; }
inline aiMetadataType GetAiType( int ) { return AI_INT; }
inline aiMetadataType GetAiType( uint64_t ) { return AI_UINT64; }
inline aiMetadataType GetAiType( float ) { return AI_FLOAT; }
inline aiMetadataType GetAiType( aiString ) { return AI_AISTRING; }
inline aiMetadataType GetAiType( aiVector3D ) { return AI_AIVECTOR3D; }



#endif



// -------------------------------------------------------------------------------
 // -------------------------------------------------------------------------------
struct aiMetadata 
{
    unsigned int mNumProperties;

    C_STRUCT aiString* mKeys;

    C_STRUCT aiMetadataEntry* mValues;

#ifdef __cplusplus

    aiMetadata()
        // set all members to zero by default
        : mNumProperties(0)
        , mKeys(NULL)
        , mValues(NULL)
    {}


    ~aiMetadata()
    {
        delete[] mKeys;
        mKeys = NULL;
        if (mValues)
        {
            // Delete each metadata entry
            for (unsigned i=0; i<mNumProperties; ++i)
            {
                void* data = mValues[i].mData;
                switch (mValues[i].mType) 
                {
                case AI_BOOL:
                    delete static_cast<bool*>(data);
                    break;
                case AI_INT:
                    delete static_cast<int*>(data);
                    break;
                case AI_UINT64:
                    delete static_cast<uint64_t*>(data);
                    break;
                case AI_FLOAT:
                    delete static_cast<float*>(data);
                    break;
                case AI_AISTRING:
                    delete static_cast<aiString*>(data);
                    break;
                case AI_AIVECTOR3D:
                    delete static_cast<aiVector3D*>(data);
                    break;
                default:
                    assert(false);
                    break;
                }
            }

            // Delete the metadata array
            delete [] mValues;
            mValues = NULL;
        }
    }



    template<typename T>
    inline void Set( unsigned index, const std::string& key, const T& value )
    {
        // In range assertion
        assert(index < mNumProperties);

        // Set metadata key
        mKeys[index] = key;

        // Set metadata type
        mValues[index].mType = GetAiType(value);
        // Copy the given value to the dynamic storage
        mValues[index].mData = new T(value);
    }

    template<typename T>
    inline bool Get( unsigned index, T& value )
    {
        // In range assertion
        assert(index < mNumProperties);

        // Return false if the output data type does 
        // not match the found value's data type
        if ( GetAiType( value ) != mValues[ index ].mType ) {
            return false;
        }

        // Otherwise, output the found value and 
        // return true
        value = *static_cast<T*>(mValues[index].mData);
        return true;
    }

    template<typename T>
    inline bool Get( const aiString& key, T& value )
    {
        // Search for the given key
        for (unsigned i=0; i<mNumProperties; ++i)
            if (mKeys[i]==key)
                return Get(i, value);
        return false;
    }

    template<typename T>
    inline bool Get( const std::string& key, T& value ) {
        return Get(aiString(key), value); 
    }

#endif // __cplusplus

};

#endif // __AI_METADATA_H_INC__