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Sweden-Number/dlls/msi/join.c

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/*
* Implementation of the Microsoft Installer (msi.dll)
*
* Copyright 2006 Mike McCormack for CodeWeavers
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "winerror.h"
#include "wine/debug.h"
#include "msi.h"
#include "msiquery.h"
#include "objbase.h"
#include "objidl.h"
#include "msipriv.h"
#include "query.h"
WINE_DEFAULT_DEBUG_CHANNEL(msidb);
typedef struct tagMSIJOINVIEW
{
MSIVIEW view;
MSIDATABASE *db;
MSIVIEW *left, *right;
UINT left_count, right_count;
UINT left_key, right_key;
UINT *pairs;
UINT pair_count;
} MSIJOINVIEW;
static UINT JOIN_fetch_int( struct tagMSIVIEW *view, UINT row, UINT col, UINT *val )
{
MSIJOINVIEW *jv = (MSIJOINVIEW*)view;
MSIVIEW *table;
TRACE("%p %d %d %p\n", jv, row, col, val );
if( !jv->left || !jv->right )
return ERROR_FUNCTION_FAILED;
if( (col==0) || (col>(jv->left_count + jv->right_count)) )
return ERROR_FUNCTION_FAILED;
if( row >= jv->pair_count )
return ERROR_FUNCTION_FAILED;
if( col <= jv->left_count )
{
table = jv->left;
row = jv->pairs[ row*2 ];
}
else
{
table = jv->right;
row = jv->pairs[ row*2 + 1 ];
col -= jv->left_count;
}
return table->ops->fetch_int( table, row, col, val );
}
static UINT JOIN_fetch_stream( struct tagMSIVIEW *view, UINT row, UINT col, IStream **stm)
{
MSIJOINVIEW *jv = (MSIJOINVIEW*)view;
MSIVIEW *table;
TRACE("%p %d %d %p\n", jv, row, col, stm );
if( !jv->left || !jv->right )
return ERROR_FUNCTION_FAILED;
if( (col==0) || (col>(jv->left_count + jv->right_count)) )
return ERROR_FUNCTION_FAILED;
if( row <= jv->left_count )
{
table = jv->left;
row = jv->pairs[ row*2 ];
}
else
{
table = jv->right;
row = jv->pairs[ row*2 + 1 ];
col -= jv->left_count;
}
return table->ops->fetch_stream( table, row, col, stm );
}
static UINT JOIN_set_int( struct tagMSIVIEW *view, UINT row, UINT col, UINT val )
{
MSIJOINVIEW *jv = (MSIJOINVIEW*)view;
TRACE("%p %d %d %04x\n", jv, row, col, val );
return ERROR_FUNCTION_FAILED;
}
static UINT JOIN_insert_row( struct tagMSIVIEW *view, MSIRECORD *record )
{
MSIJOINVIEW *jv = (MSIJOINVIEW*)view;
TRACE("%p %p\n", jv, record );
return ERROR_FUNCTION_FAILED;
}
static int join_key_compare(const void *l, const void *r)
{
const UINT *left = l, *right = r;
if (left[1] < right[1])
return -1;
if (left[1] == right[1])
return 0;
return 1;
}
static UINT join_load_key_column( MSIJOINVIEW *jv, MSIVIEW *table, UINT column,
UINT **pdata, UINT *pcount )
{
UINT r, i, count = 0, *data = NULL;
r = table->ops->get_dimensions( table, &count, NULL );
if( r != ERROR_SUCCESS )
return r;
if (!count)
goto end;
data = msi_alloc( count * 2 * sizeof (UINT) );
if (!data)
return ERROR_SUCCESS;
for (i=0; i<count; i++)
{
data[i*2] = i;
r = table->ops->fetch_int( table, i, column, &data[i*2+1] );
if (r != ERROR_SUCCESS)
ERR("fetch data (%u,%u) failed\n", i, column);
}
qsort( data, count, 2 * sizeof (UINT), join_key_compare );
end:
*pdata = data;
*pcount = count;
return ERROR_SUCCESS;
}
static UINT join_match( UINT *ldata, UINT lcount,
UINT *rdata, UINT rcount,
UINT **ppairs, UINT *ppair_count )
{
UINT *pairs;
UINT n, i, j;
TRACE("left %u right %u\n", rcount, lcount);
/* there can be at most max(lcount, rcount) matches */
if (lcount > rcount)
n = lcount;
else
n = rcount;
pairs = msi_alloc( n * 2 * sizeof(UINT) );
if (!pairs)
return ERROR_OUTOFMEMORY;
for (n=0, i=0, j=0; i<lcount && j<rcount; )
{
/* values match... store the row numbers */
if (ldata[i*2+1] == rdata[j*2+1])
{
pairs[n*2] = ldata[i*2];
pairs[n*2+1] = rdata[j*2];
i++; /* FIXME: assumes primary key on the right */
n++;
continue;
}
/* values differ... move along */
if (ldata[i*2+1] < rdata[j*2+1])
i++;
else
j++;
}
*ppairs = pairs;
*ppair_count = n;
return ERROR_SUCCESS;
}
static UINT JOIN_execute( struct tagMSIVIEW *view, MSIRECORD *record )
{
MSIJOINVIEW *jv = (MSIJOINVIEW*)view;
UINT r, *ldata = NULL, *rdata = NULL, lcount = 0, rcount = 0;
TRACE("%p %p\n", jv, record);
if( !jv->left || !jv->right )
return ERROR_FUNCTION_FAILED;
r = jv->left->ops->execute( jv->left, NULL );
if (r != ERROR_SUCCESS)
return r;
r = jv->right->ops->execute( jv->right, NULL );
if (r != ERROR_SUCCESS)
return r;
r = join_load_key_column( jv, jv->left, jv->left_key, &ldata, &lcount );
if (r != ERROR_SUCCESS)
return r;
r = join_load_key_column( jv, jv->right, jv->right_key, &rdata, &rcount );
if (r != ERROR_SUCCESS)
goto end;
r = join_match( ldata, lcount, rdata, rcount, &jv->pairs, &jv->pair_count );
end:
msi_free( ldata );
msi_free( rdata );
return r;
}
static UINT JOIN_close( struct tagMSIVIEW *view )
{
MSIJOINVIEW *jv = (MSIJOINVIEW*)view;
TRACE("%p\n", jv );
if( !jv->left || !jv->right )
return ERROR_FUNCTION_FAILED;
jv->left->ops->close( jv->left );
jv->right->ops->close( jv->right );
return ERROR_SUCCESS;
}
static UINT JOIN_get_dimensions( struct tagMSIVIEW *view, UINT *rows, UINT *cols )
{
MSIJOINVIEW *jv = (MSIJOINVIEW*)view;
TRACE("%p %p %p\n", jv, rows, cols );
if( cols )
*cols = jv->left_count + jv->right_count;
if( rows )
{
if( !jv->left || !jv->right )
return ERROR_FUNCTION_FAILED;
*rows = jv->pair_count;
}
return ERROR_SUCCESS;
}
static UINT JOIN_get_column_info( struct tagMSIVIEW *view,
UINT n, LPWSTR *name, UINT *type )
{
MSIJOINVIEW *jv = (MSIJOINVIEW*)view;
TRACE("%p %d %p %p\n", jv, n, name, type );
if( !jv->left || !jv->right )
return ERROR_FUNCTION_FAILED;
if( (n==0) || (n>(jv->left_count + jv->right_count)) )
return ERROR_FUNCTION_FAILED;
if( n <= jv->left_count )
return jv->left->ops->get_column_info( jv->left, n, name, type );
n = n - jv->left_count;
return jv->right->ops->get_column_info( jv->right, n, name, type );
}
static UINT JOIN_modify( struct tagMSIVIEW *view, MSIMODIFY eModifyMode,
MSIRECORD *rec )
{
MSIJOINVIEW *jv = (MSIJOINVIEW*)view;
TRACE("%p %d %p\n", jv, eModifyMode, rec );
return ERROR_FUNCTION_FAILED;
}
static UINT JOIN_delete( struct tagMSIVIEW *view )
{
MSIJOINVIEW *jv = (MSIJOINVIEW*)view;
TRACE("%p\n", jv );
if( jv->left )
jv->left->ops->delete( jv->left );
jv->left = NULL;
if( jv->right )
jv->right->ops->delete( jv->right );
jv->right = NULL;
msi_free( jv->pairs );
jv->pairs = NULL;
msi_free( jv );
return ERROR_SUCCESS;
}
static UINT JOIN_find_matching_rows( struct tagMSIVIEW *view, UINT col,
UINT val, UINT *row, MSIITERHANDLE *handle )
{
MSIJOINVIEW *jv = (MSIJOINVIEW*)view;
FIXME("%p, %d, %u, %p\n", jv, col, val, *handle);
return ERROR_FUNCTION_FAILED;
}
static const MSIVIEWOPS join_ops =
{
JOIN_fetch_int,
JOIN_fetch_stream,
JOIN_set_int,
JOIN_insert_row,
JOIN_execute,
JOIN_close,
JOIN_get_dimensions,
JOIN_get_column_info,
JOIN_modify,
JOIN_delete,
JOIN_find_matching_rows
};
/*
* join_check_condition
*
* This is probably overly strict about what kind of condition we need
* for a join query.
*/
static UINT join_check_condition(MSIJOINVIEW *jv, struct expr *cond)
{
UINT r;
/* assume that we have `KeyColumn` = `SubkeyColumn` */
if ( cond->type != EXPR_COMPLEX )
return ERROR_FUNCTION_FAILED;
if ( cond->u.expr.op != OP_EQ )
return ERROR_FUNCTION_FAILED;
if ( cond->u.expr.left->type != EXPR_COLUMN )
return ERROR_FUNCTION_FAILED;
if ( cond->u.expr.right->type != EXPR_COLUMN )
return ERROR_FUNCTION_FAILED;
/* make sure both columns exist */
r = VIEW_find_column( jv->left, cond->u.expr.left->u.column, &jv->left_key );
if (r != ERROR_SUCCESS)
return ERROR_FUNCTION_FAILED;
r = VIEW_find_column( jv->right, cond->u.expr.right->u.column, &jv->right_key );
if (r != ERROR_SUCCESS)
return ERROR_FUNCTION_FAILED;
TRACE("left %s (%u) right %s (%u)\n",
debugstr_w(cond->u.expr.left->u.column), jv->left_key,
debugstr_w(cond->u.expr.right->u.column), jv->right_key);
return ERROR_SUCCESS;
}
UINT JOIN_CreateView( MSIDATABASE *db, MSIVIEW **view,
LPCWSTR left, LPCWSTR right,
struct expr *cond )
{
MSIJOINVIEW *jv = NULL;
UINT r = ERROR_SUCCESS;
TRACE("%p (%s,%s)\n", jv, debugstr_w(left), debugstr_w(right) );
jv = msi_alloc_zero( sizeof *jv );
if( !jv )
return ERROR_FUNCTION_FAILED;
/* fill the structure */
jv->view.ops = &join_ops;
jv->db = db;
/* create the tables to join */
r = TABLE_CreateView( db, left, &jv->left );
if( r != ERROR_SUCCESS )
{
ERR("can't create left table\n");
goto end;
}
r = TABLE_CreateView( db, right, &jv->right );
if( r != ERROR_SUCCESS )
{
ERR("can't create right table\n");
goto end;
}
/* get the number of columns in each table */
r = jv->left->ops->get_dimensions( jv->left, NULL, &jv->left_count );
if( r != ERROR_SUCCESS )
{
ERR("can't get left table dimensions\n");
goto end;
}
r = jv->right->ops->get_dimensions( jv->right, NULL, &jv->right_count );
if( r != ERROR_SUCCESS )
{
ERR("can't get right table dimensions\n");
goto end;
}
r = join_check_condition( jv, cond );
if( r != ERROR_SUCCESS )
{
ERR("can't get join condition\n");
goto end;
}
*view = &jv->view;
return ERROR_SUCCESS;
end:
jv->view.ops->delete( &jv->view );
return r;
}
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