drivers/macab/MacabHeader.cxx

/**************************************************************
 *
 * 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
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_connectivity.hxx"

#include "MacabHeader.hxx"
#include "MacabRecord.hxx"
#include "macabutilities.hxx"

#include <math.h>
#include <com/sun/star/sdbc/DataType.hpp>
#include <connectivity/dbconversion.hxx>

using namespace connectivity::macab;
using namespace com::sun::star::sdbc;
using namespace com::sun::star::util;
using namespace ::dbtools;

// -------------------------------------------------------------------------
MacabHeader::MacabHeader(const sal_Int32 _size, macabfield **_fields)
{
    sal_Int32 i;
    size = _size;
    fields = new macabfield *[size];
    for(i = 0; i < size; i++)
    {
        if(_fields[i] == NULL)
        {
            fields[i] = NULL;
        }
        else
        {
            /* The constructor duplicates the macabfields it gets because they
             * are either deleted later or used for other purposes.
             */
            fields[i] = new macabfield;
            fields[i]->type = _fields[i]->type;
            fields[i]->value = _fields[i]->value;
            if (fields[i]->value)
                CFRetain(fields[i]->value);
        }
    }

}

// -------------------------------------------------------------------------
MacabHeader::MacabHeader()
{
    size = 0;
    fields = NULL;
}

// -------------------------------------------------------------------------
MacabHeader::~MacabHeader()
{
}

// -------------------------------------------------------------------------
void MacabHeader::operator+= (const MacabHeader *r)
{
    /* Add one MacabHeader to another. Anything not already in the header is
     * added to the end of it.
     */
    sal_Int32 rSize = r->getSize();
    if(rSize != 0) // If the new header does actually have fields
    {
        /* If our header is currently empty, just copy all of the fields from
         * the new header to this one.
         */
        if(size == 0)
        {
            sal_Int32 i;
            size = rSize;
            fields = new macabfield *[size];
            for(i = 0; i < size; i++)
            {
                fields[i] = r->copy(i);
            }
        }

        /* Otherwise, only add the duplicates. We do this with a two-pass
         * approach. First, find out how many fields to add, then reallocate
         * the size of the fields array and add the old ones at the end.
         * (More precisely, we create a _new_ fields array with the new length
         * allocated to it, then get all of the fields from the current
         * fields array to it, then copy the non-duplicates from the new
         * header to the end.)
         */
        else
        {
            sal_Int32 i;
            sal_Int32 numToAdd = 0, numAdded = 0;
            macabfield **newFields;
            for( i = 0; i < rSize; i++)
            {
                if(!contains(r->get(i)))
                {
                    numToAdd++;
                }
            }

            newFields = new macabfield *[size+numToAdd];
            for(i = 0; i < size; i++)
            {
                newFields[i] = copy(i);
            }

            for( i = 0; i < rSize; i++)
            {
                if(!contains(r->get(i)))
                {
                    newFields[size+numAdded] = r->copy(i);
                    numAdded++;
                    if(numAdded == numToAdd)
                        break;
                }
            }

            releaseFields();
            delete [] fields;
            size += numAdded;
            fields = newFields;
        }
    }
}

// -------------------------------------------------------------------------
::rtl::OUString MacabHeader::getString(const sal_Int32 i) const
{
    ::rtl::OUString nRet;

    if(i < size)
    {
        if(fields[i] == NULL || fields[i]->value == NULL || CFGetTypeID(fields[i]->value) != CFStringGetTypeID())
            return ::rtl::OUString();
        try
        {
            nRet = CFStringToOUString( (CFStringRef) fields[i]->value);
        }
        catch(...){ }
    }

    return nRet;
}

// -------------------------------------------------------------------------
void MacabHeader::sortRecord()
{
    sortRecord(0,size);
}

// -------------------------------------------------------------------------
macabfield **MacabHeader::sortRecord(const sal_Int32 _start, const sal_Int32 _length)
{
    /* Sort using mergesort. Because it uses mergesort, it is recursive and
     * not in place (so it creates a new array at every step of the
     * recursion), so if you prefer to use a different sort, please feel
     * free to implement it.
     */
    macabfield** sorted = new macabfield *[_length];
    if(_length <= 2)
    {
        if(_length == 2)
        {
            if(compareFields(fields[_start], fields[_start+1]) > 0)
            {
                sorted[0] = get(_start+1);
                sorted[1] = get(_start);
            }
            else
            {
                sorted[0] = get(_start);
                sorted[1] = get(_start+1);
            }
        }
        else if(_length == 1)
        {
            sorted[0] = get(_start);
        }
    }
    else
    {
        sal_Int32 halfLength = floor(_length/2);
        sal_Int32 fp = 0, lp = 0;
        sal_Int32 i;
        macabfield **firstHalf = new macabfield *[halfLength];
        macabfield **lastHalf = new macabfield *[_length - halfLength];

        firstHalf = sortRecord(_start, halfLength);
        lastHalf = sortRecord(_start+halfLength, _length-halfLength);
        for(i = 0; i < _length; i++)
        {
            if(compareFields(firstHalf[fp],lastHalf[lp]) < 0)
            {
                sorted[i] = firstHalf[fp++];
                if(fp == halfLength)
                {
                    for( i++; i < _length; i++)
                    {
                        sorted[i] = lastHalf[lp++];
                    }
                    break;
                }
            }
            else
            {
                sorted[i] = lastHalf[lp++];
                if(lp == _length - halfLength)
                {
                    for( i++; i < _length; i++)
                    {
                        sorted[i] = firstHalf[fp++];
                    }
                    break;
                }
            }
        }
        if(_length == size)
        {
            fields = sorted;
        }
    }
    return sorted;
}

sal_Int32 MacabHeader::compareFields(const macabfield *_field1, const macabfield *_field2)
{
    /* Comparing two fields in a MacabHeader is different than comparing two
     * fields in a MacabRecord. It starts in the same way (if one of the two
     * fields is NULL, it belongs after the other, so it is considered
     * "greater"). But, then, all headers are CFStrings, no matter what
     * type they claim to be (since they actually hold the expected type for
     * the records with that header). That being said, all we have to do is
     * the built-in CFStringCompare.
     */
    if(_field1 == _field2)
        return 0;
    if(_field1 == NULL)
        return 1;
    if(_field2 == NULL)
        return -1;

    CFComparisonResult result = CFStringCompare(
        (CFStringRef) _field1->value,
        (CFStringRef) _field2->value,
        0); // 0 = no options (like ignore case)

    return (sal_Int32) result;
}

// -------------------------------------------------------------------------
sal_Int32 MacabHeader::getColumnNumber(const ::rtl::OUString s) const
{
    sal_Int32 i;
    for(i = 0; i < size; i++)
    {
        if(getString(i) == s)
            break;
    }

    if(i == size)
        i = -1;

    return i;
}

// -------------------------------------------------------------------------
MacabHeader *MacabHeader::begin()
{
    return this;
}

// -------------------------------------------------------------------------
MacabHeader::iterator::iterator ()
{
}

// -------------------------------------------------------------------------
MacabHeader::iterator::~iterator ()
{
}

void MacabHeader::iterator::operator= (MacabHeader *_record)
{
    id = 0;
    record = _record;
}

// -------------------------------------------------------------------------
void MacabHeader::iterator::operator++ ()
{
    id++;
}

// -------------------------------------------------------------------------
sal_Bool MacabHeader::iterator::operator!= (const sal_Int32 i) const
{
    return(id != i);
}

// -------------------------------------------------------------------------
sal_Bool MacabHeader::iterator::operator== (const sal_Int32 i) const
{
    return(id == i);
}

// -------------------------------------------------------------------------
macabfield *MacabHeader::iterator::operator* () const
{
    return record->get(id);
}

// -------------------------------------------------------------------------
sal_Int32 MacabHeader::end() const
{
    return size;
}