/*

   Derby - Class org.apache.derby.impl.sql.catalog.SYSTABLEPERMSRowFactory

   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.

 */

package org.apache.derby.impl.sql.catalog;

import org.apache.derby.catalog.UUID;
import org.apache.derby.iapi.error.StandardException;
import org.apache.derby.shared.common.sanity.SanityManager;
import org.apache.derby.iapi.services.uuid.UUIDFactory;
import org.apache.derby.iapi.sql.dictionary.PermissionsDescriptor;
import org.apache.derby.iapi.sql.dictionary.DataDescriptorGenerator;
import org.apache.derby.iapi.sql.dictionary.DataDictionary;
import org.apache.derby.iapi.sql.dictionary.SystemColumn;
import org.apache.derby.iapi.sql.dictionary.TableDescriptor;
import org.apache.derby.iapi.sql.dictionary.TablePermsDescriptor;
import org.apache.derby.iapi.sql.dictionary.TupleDescriptor;
import org.apache.derby.iapi.sql.execute.ExecIndexRow;
import org.apache.derby.iapi.sql.execute.ExecRow;
import org.apache.derby.iapi.sql.execute.ExecutionFactory;
import org.apache.derby.iapi.types.DataValueDescriptor;
import org.apache.derby.iapi.types.DataValueFactory;
import org.apache.derby.iapi.types.RowLocation;
import org.apache.derby.iapi.types.SQLChar;
import org.apache.derby.iapi.types.StringDataValue;

/**
 * Factory for creating a SYSTABLEPERMS row.
 *
 */

public class SYSTABLEPERMSRowFactory extends PermissionsCatalogRowFactory
{
	static final String TABLENAME_STRING = "SYSTABLEPERMS";

    // Column numbers for the SYSTABLEPERMS table. 1 based
	private static final int TABLEPERMSID_COL_NUM = 1;
    private static final int GRANTEE_COL_NUM = 2;
    private static final int GRANTOR_COL_NUM = 3;
    private static final int TABLEID_COL_NUM = 4;
    private static final int SELECTPRIV_COL_NUM = 5;
    private static final int DELETEPRIV_COL_NUM = 6;
    private static final int INSERTPRIV_COL_NUM = 7;
    private static final int UPDATEPRIV_COL_NUM = 8;
    private static final int REFERENCESPRIV_COL_NUM = 9;
    private static final int TRIGGERPRIV_COL_NUM = 10;
    private static final int COLUMN_COUNT = 10;

    public static final int GRANTEE_TABLE_GRANTOR_INDEX_NUM = 0;
    public static final int TABLEPERMSID_INDEX_NUM = 1;
    public static final int TABLEID_INDEX_NUM = 2;
	private static final int[][] indexColumnPositions = 
	{ 
		{ GRANTEE_COL_NUM, TABLEID_COL_NUM, GRANTOR_COL_NUM},
		{ TABLEPERMSID_COL_NUM },
		{ TABLEID_COL_NUM }
	};

    public static final int GRANTEE_COL_NUM_IN_GRANTEE_TABLE_GRANTOR_INDEX = 1;

    private static final boolean[] indexUniqueness = { true, true, false};
    
    private	static final String[] uuids =
    {
        "b8450018-0103-0e39-b8e7-00000010f010" // catalog UUID
		,"004b0019-0103-0e39-b8e7-00000010f010"	// heap UUID
		,"c851401a-0103-0e39-b8e7-00000010f010"	// index1
		,"80220011-010c-426e-c599-0000000f1120"	// index2
		,"f81e0010-010c-bc85-060d-000000109ab8"	// index3
    };

    SYSTABLEPERMSRowFactory(UUIDFactory uuidf, ExecutionFactory ef, DataValueFactory dvf)
	{
		super(uuidf,ef,dvf);
		initInfo(COLUMN_COUNT, TABLENAME_STRING, indexColumnPositions, indexUniqueness, uuids);
	}

	public ExecRow makeRow(TupleDescriptor td, TupleDescriptor parent) throws StandardException
	{
		UUID						oid;
        DataValueDescriptor grantee = null;
        DataValueDescriptor grantor = null;
        String tablePermID = null;
        String tableID = null;
        String selectPriv = null;
        String deletePriv = null;
        String insertPriv = null;
        String updatePriv = null;
        String referencesPriv = null;
        String triggerPriv = null;

        if( td == null)
        {
            grantee = getNullAuthorizationID();
            grantor = getNullAuthorizationID();
        }
        else
        {
            TablePermsDescriptor tpd = (TablePermsDescriptor) td;
            oid = tpd.getUUID();
            if ( oid == null )
            {
				oid = getUUIDFactory().createUUID();
				tpd.setUUID(oid);
            }
            tablePermID = oid.toString();

			grantee = getAuthorizationID( tpd.getGrantee());
            grantor = getAuthorizationID( tpd.getGrantor());
            tableID = tpd.getTableUUID().toString();
            selectPriv = tpd.getSelectPriv();
            deletePriv = tpd.getDeletePriv();
            insertPriv = tpd.getInsertPriv();
            updatePriv = tpd.getUpdatePriv();
            referencesPriv = tpd.getReferencesPriv();
            triggerPriv = tpd.getTriggerPriv();
        }
        ExecRow row = getExecutionFactory().getValueRow( COLUMN_COUNT);
        row.setColumn( TABLEPERMSID_COL_NUM, new SQLChar(tablePermID));
        row.setColumn( GRANTEE_COL_NUM, grantee);
        row.setColumn( GRANTOR_COL_NUM, grantor);
        row.setColumn( TABLEID_COL_NUM, new SQLChar(tableID));
        row.setColumn( SELECTPRIV_COL_NUM, new SQLChar(selectPriv));
        row.setColumn( DELETEPRIV_COL_NUM, new SQLChar(deletePriv));
        row.setColumn( INSERTPRIV_COL_NUM, new SQLChar(insertPriv));
        row.setColumn( UPDATEPRIV_COL_NUM, new SQLChar(updatePriv));
        row.setColumn( REFERENCESPRIV_COL_NUM, new SQLChar( referencesPriv));
        row.setColumn( TRIGGERPRIV_COL_NUM, new SQLChar(triggerPriv));

        return row;
    } // end of makeRow
            
	/** builds a tuple descriptor from a row */
	public TupleDescriptor buildDescriptor(ExecRow row,
                                           TupleDescriptor parentTuple,
                                           DataDictionary dataDictionary)
		throws StandardException
    {
		if( SanityManager.DEBUG)
            SanityManager.ASSERT( row.nColumns() == COLUMN_COUNT,
                                  "Wrong size row passed to SYSTABLEPERMSRowFactory.buildDescriptor");

        String tablePermsUUIDString = row.getColumn(TABLEPERMSID_COL_NUM).getString();
        UUID tablePermsUUID = getUUIDFactory().recreateUUID(tablePermsUUIDString);
        String tableUUIDString = row.getColumn( TABLEID_COL_NUM).getString();
        UUID tableUUID = getUUIDFactory().recreateUUID(tableUUIDString);
        String selectPriv  = row.getColumn( SELECTPRIV_COL_NUM).getString();
        String deletePriv  = row.getColumn( DELETEPRIV_COL_NUM).getString();
        String insertPriv  = row.getColumn( INSERTPRIV_COL_NUM).getString();
        String updatePriv  = row.getColumn( UPDATEPRIV_COL_NUM).getString();
        String referencesPriv  = row.getColumn( REFERENCESPRIV_COL_NUM).getString();
        String triggerPriv  = row.getColumn( TRIGGERPRIV_COL_NUM).getString();
        if( SanityManager.DEBUG)
        {
            SanityManager.ASSERT( "y".equals(selectPriv) || "Y".equals(selectPriv) || "N".equals(selectPriv),
                                  "Invalid SYSTABLEPERMS.selectPriv column value: " + selectPriv);
            SanityManager.ASSERT( "y".equals(deletePriv) || "Y".equals(deletePriv) || "N".equals(deletePriv),
                                  "Invalid SYSTABLEPERMS.deletePriv column value: " + deletePriv);
            SanityManager.ASSERT( "y".equals(insertPriv) || "Y".equals(insertPriv) || "N".equals(insertPriv),
                                  "Invalid SYSTABLEPERMS.insertPriv column value: " + insertPriv);
            SanityManager.ASSERT( "y".equals(updatePriv) || "Y".equals(updatePriv) || "N".equals(updatePriv),
                                  "Invalid SYSTABLEPERMS.updatePriv column value: " + updatePriv);
            SanityManager.ASSERT( "y".equals(referencesPriv) || "Y".equals(referencesPriv) || "N".equals(referencesPriv),
                                  "Invalid SYSTABLEPERMS.referencesPriv column value: " + referencesPriv);
            SanityManager.ASSERT( "y".equals(triggerPriv) || "Y".equals(triggerPriv) || "N".equals(triggerPriv),
                                  "Invalid SYSTABLEPERMS.triggerPriv column value: " + triggerPriv);
        }

		TablePermsDescriptor tabPermsDesc =
        new TablePermsDescriptor( dataDictionary,
                                         getAuthorizationID( row, GRANTEE_COL_NUM),
                                         getAuthorizationID( row, GRANTOR_COL_NUM),
                                         tableUUID,
                                         selectPriv, deletePriv, insertPriv,
                                         updatePriv, referencesPriv, triggerPriv);
		tabPermsDesc.setUUID(tablePermsUUID);
		return tabPermsDesc;
    } // end of buildDescriptor

	/** builds a column list for the catalog */
	public SystemColumn[] buildColumnList()
        throws StandardException
    {
        return new SystemColumn[] {
            SystemColumnImpl.getUUIDColumn("TABLEPERMSID", false),
            SystemColumnImpl.getIdentifierColumn("GRANTEE", false),
            SystemColumnImpl.getIdentifierColumn("GRANTOR", false),
            SystemColumnImpl.getUUIDColumn("TABLEID", false),
            SystemColumnImpl.getIndicatorColumn("SELECTPRIV"),
            SystemColumnImpl.getIndicatorColumn("DELETEPRIV"),
            SystemColumnImpl.getIndicatorColumn("INSERTPRIV"),
            SystemColumnImpl.getIndicatorColumn("UPDATEPRIV"),
            SystemColumnImpl.getIndicatorColumn("REFERENCESPRIV"),
            SystemColumnImpl.getIndicatorColumn("TRIGGERPRIV"),
        };
    }

	/**
	 * builds a key row given for a given index number.
	 */
  	public ExecIndexRow buildIndexKeyRow( int indexNumber,
                                          PermissionsDescriptor perm) 
  		throws StandardException
    {
        ExecIndexRow row = null;
        
        switch( indexNumber)
        {
        case GRANTEE_TABLE_GRANTOR_INDEX_NUM:
            // RESOLVE We do not support the FOR GRANT OPTION, so table permission rows are unique on the
            // grantee and table UUID columns. The grantor column will always have the name of the owner of the
            // table. So the index key, used for searching the index, only has grantee and table UUID columns.
            // It does not have a grantor column.
            //
            // If we support FOR GRANT OPTION then there may be multiple table permissions rows for a
            // (grantee, tableID) combination. We must either handle the multiple rows, which is necessary for
            // checking permissions, or add a grantor column to the key, which is necessary for granting or revoking
            // permissions.
            row = getExecutionFactory().getIndexableRow( 2);
            row.setColumn(1, getAuthorizationID( perm.getGrantee()));
            String tableUUIDStr = ((TablePermsDescriptor) perm).getTableUUID().toString();
            row.setColumn(2, new SQLChar(tableUUIDStr));
            break;
        case TABLEPERMSID_INDEX_NUM:
            row = getExecutionFactory().getIndexableRow( 1);
            String tablePermsUUIDStr = perm.getObjectID().toString();
            row.setColumn(1, new SQLChar(tablePermsUUIDStr));
            break;
        case TABLEID_INDEX_NUM:
            row = getExecutionFactory().getIndexableRow( 1);
            tableUUIDStr = ((TablePermsDescriptor) perm).getTableUUID().toString();
            row.setColumn(1, new SQLChar(tableUUIDStr));
            break;
        }
        return row;
    } // end of buildIndexRow
    
    public int getPrimaryKeyIndexNumber()
    {
        return GRANTEE_TABLE_GRANTOR_INDEX_NUM;
    }

    /**
     * Or a set of permissions in with a row from this catalog table
     *
     * @param row an existing row
     * @param perm a permission descriptor of the appropriate class for this PermissionsCatalogRowFactory class.
     * @param colsChanged An array with one element for each column in row. It is updated to
     *                    indicate which columns in row were changed
     *
     * @return The number of columns that were changed.
     *
     * @exception StandardException standard error policy
     */
    public int orPermissions( ExecRow row, PermissionsDescriptor perm, boolean[] colsChanged)
        throws StandardException
    {
        TablePermsDescriptor tablePerms = (TablePermsDescriptor) perm;
        int changeCount = 0;
        changeCount += orOnePermission( row, colsChanged, SELECTPRIV_COL_NUM, tablePerms.getSelectPriv());
        changeCount += orOnePermission( row, colsChanged, DELETEPRIV_COL_NUM, tablePerms.getDeletePriv());
        changeCount += orOnePermission( row, colsChanged, INSERTPRIV_COL_NUM, tablePerms.getInsertPriv());
        changeCount += orOnePermission( row, colsChanged, UPDATEPRIV_COL_NUM, tablePerms.getUpdatePriv());
        changeCount += orOnePermission( row, colsChanged, REFERENCESPRIV_COL_NUM, tablePerms.getReferencesPriv());
        changeCount += orOnePermission( row, colsChanged, TRIGGERPRIV_COL_NUM, tablePerms.getTriggerPriv());

        return changeCount;
    } // end of orPermissions

    private int orOnePermission( ExecRow row, boolean[] colsChanged, int column, String permission)
        throws StandardException
    {
        if( permission.charAt(0) == 'N')
            return 0;

        if( SanityManager.DEBUG)
            SanityManager.ASSERT( permission.charAt(0) == 'Y' || permission.charAt(0) == 'y',
                                  "Invalid permission passed to SYSTABLEPERMSRowFactory.orOnePermission");
        DataValueDescriptor existingPermDVD = row.getColumn( column);
        char existingPerm = existingPermDVD.getString().charAt(0);
        if( existingPerm == 'Y' || existingPerm == permission.charAt(0))
            return 0;
        existingPermDVD.setValue( permission);
        colsChanged[ column - 1] = true;
        return 1;
    } // end of orOnePermission

    /**
     * Remove a set of permissions from a row from this catalog table
     *
     * @param row an existing row
     * @param perm a permission descriptor of the appropriate class for this PermissionsCatalogRowFactory class.
     * @param colsChanged An array with one element for each column in row. It is updated to
     *                    indicate which columns in row were changed
     *
     * @return -1 if there are no permissions left in the row, otherwise the number of columns that were changed.
     *
     * @exception StandardException standard error policy
     */
    public int removePermissions( ExecRow row, PermissionsDescriptor perm, boolean[] colsChanged)
        throws StandardException
    {
        TablePermsDescriptor tablePerms = (TablePermsDescriptor) perm;
        int changeCount = 0;
        boolean permissionsLeft =
          ( removeOnePermission( row, colsChanged, SELECTPRIV_COL_NUM, tablePerms.getSelectPriv()) |
            removeOnePermission( row, colsChanged, DELETEPRIV_COL_NUM, tablePerms.getDeletePriv()) |
            removeOnePermission( row, colsChanged, INSERTPRIV_COL_NUM, tablePerms.getInsertPriv()) |
            removeOnePermission( row, colsChanged, UPDATEPRIV_COL_NUM, tablePerms.getUpdatePriv()) |
            removeOnePermission( row, colsChanged, REFERENCESPRIV_COL_NUM, tablePerms.getReferencesPriv()) |
            removeOnePermission( row, colsChanged, TRIGGERPRIV_COL_NUM, tablePerms.getTriggerPriv()));
        if( ! permissionsLeft)
            return -1;
        for( int i = 0; i < colsChanged.length; i++)
        {
            if( colsChanged[ i])
                changeCount++;
        }
        return changeCount;
    } // end of removePermissions

    private boolean removeOnePermission( ExecRow row, boolean[] colsChanged, int column, String permission)
        throws StandardException
    {
        DataValueDescriptor existingPermDVD = row.getColumn( column);
        char existingPerm = existingPermDVD.getString().charAt(0);

        if( permission.charAt(0) == 'N') // Don't remove this one
            return existingPerm != 'N'; // The grantee still has some permissions on this table
        if( SanityManager.DEBUG)
            SanityManager.ASSERT( permission.charAt(0) == 'Y' || permission.charAt(0) == 'y',
                                  "Invalid permission passed to SYSTABLEPERMSRowFactory.removeOnePermission");
        if( existingPerm != 'N')
        {
            existingPermDVD.setValue( "N");
            colsChanged[ column - 1] = true;
        }
        return false;
    } // end of removeOnePermission
    
	/** 
	 * @see PermissionsCatalogRowFactory#setUUIDOfThePassedDescriptor
	 */
    public void setUUIDOfThePassedDescriptor(ExecRow row, PermissionsDescriptor perm)
    throws StandardException
    {
        DataValueDescriptor existingPermDVD = row.getColumn(TABLEPERMSID_COL_NUM);
        perm.setUUID(getUUIDFactory().recreateUUID(existingPermDVD.getString()));
    }
}