xref: /AOO41X/main/connectivity/source/inc/TSortIndex.hxx (revision caf5cd79edad04a48dcaf209068b3b89eae4622e)

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 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
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 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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#ifndef CONNECTIVITY_TSORTINDEX_HXX
#define CONNECTIVITY_TSORTINDEX_HXX

#include "connectivity/dbtoolsdllapi.hxx"
#include "TKeyValue.hxx"

namespace connectivity
{
    typedef enum
    {
        SQL_ORDERBYKEY_NONE,        // do not sort
        SQL_ORDERBYKEY_DOUBLE,      // numeric key
        SQL_ORDERBYKEY_STRING       // String Key
    } OKeyType;

    typedef enum
    {
        SQL_ASC     = 1,            // ascending
        SQL_DESC    = -1            // otherwise
    } TAscendingOrder;

    class OKeySet;
    class OKeyValue;                // simple class which holds a sal_Int32 and a ::std::vector<ORowSetValueDecoratorRef>

    /**
        The class OSortIndex can be used to implement a sorted index.
        This can depend on the fields which should be sorted.
    */
    class OOO_DLLPUBLIC_DBTOOLS OSortIndex
    {
    public:
        typedef ::std::vector< ::std::pair<sal_Int32,OKeyValue*> >  TIntValuePairVector;
        typedef ::std::vector<OKeyType>                             TKeyTypeVector;

    private:
        TIntValuePairVector             m_aKeyValues;
        TKeyTypeVector                  m_aKeyType;
        ::std::vector<TAscendingOrder>  m_aAscending;
        sal_Bool                        m_bFrozen;

    public:

        OSortIndex( const ::std::vector<OKeyType>& _aKeyType,
                    const ::std::vector<TAscendingOrder>& _aAscending);

        ~OSortIndex();

        inline static void * SAL_CALL operator new( size_t nSize ) SAL_THROW( () )
            { return ::rtl_allocateMemory( nSize ); }
        inline static void * SAL_CALL operator new( size_t,void* _pHint ) SAL_THROW( () )
            { return _pHint; }
        inline static void SAL_CALL operator delete( void * pMem ) SAL_THROW( () )
            { ::rtl_freeMemory( pMem ); }
        inline static void SAL_CALL operator delete( void *,void* ) SAL_THROW( () )
            {  }


        /**
            AddKeyValue appends a new value.
            @param
                pKeyValue   the keyvalue to be appended
            ATTENTION: when the sortindex is already frozen the parameter will be deleted
        */
        void AddKeyValue(OKeyValue * pKeyValue);

        /**
            Freeze freezes the sortindex so that new values could only be appended by their value
        */
        void Freeze();

        /**
            CreateKeySet creates the keyset which vaalues could be used to travel in your table/result
            The returned keyset is frozen.
        */
        ::vos::ORef<OKeySet> CreateKeySet();



        // look at the name
        sal_Bool IsFrozen() const { return m_bFrozen; }
        // returns the current size of the keyvalues
        sal_Int32 Count()   const { return m_aKeyValues.size(); }
        /** GetValue returns the value at position nPos (1..n) [sorted access].
            It only allowed to call this method after the sortindex has been frozen.
        */

        sal_Int32 GetValue(sal_Int32 nPos) const;

        inline const ::std::vector<OKeyType>& getKeyType() const { return m_aKeyType; }
        inline TAscendingOrder getAscending(::std::vector<TAscendingOrder>::size_type _nPos) const { return m_aAscending[_nPos]; }

    };

    /**
        The class OKeySet is a refcountable vector which also has a state.
        This state gives information about if the keyset is fixed.
    */
    class OOO_DLLPUBLIC_DBTOOLS OKeySet : public ORefVector<sal_Int32>
    {
        sal_Bool m_bFrozen;
    public:
        OKeySet()
            : ORefVector<sal_Int32>()
            , m_bFrozen(sal_False){}
        OKeySet(Vector::size_type _nSize)
            : ORefVector<sal_Int32>(_nSize)
            , m_bFrozen(sal_False){}

        sal_Bool    isFrozen() const                        { return m_bFrozen; }
        void        setFrozen(sal_Bool _bFrozen=sal_True)   { m_bFrozen = _bFrozen; }
    };
}
#endif // CONNECTIVITY_TSORTINDEX_HXX