/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.db.sql;
import java.sql.SQLException;
import java.util.ArrayList;
import com.caucho.db.table.Table;
import com.caucho.db.table.TableIterator;
class OidExpr extends Expr {
private Table _table;
private int _tableIndex;
private FromItem _fromItem;
OidExpr(FromItem fromItem, Table table, int tableIndex)
{
_fromItem = fromItem;
_table = table;
_tableIndex = tableIndex;
}
FromItem getFromItem()
{
return _fromItem;
}
@Override
public Class<?> getType()
{
return long.class;
}
@Override
public boolean isLong()
{
return true;
}
/**
* Returns any column name.
*/
public String getName()
{
return "resin_oid";
}
/**
* Returns the column's table.
*/
public Table getTable()
{
return _table;
}
@Override
public long indexSubCost(ArrayList<FromItem> costItems)
{
if (! costItems.contains(_fromItem))
return INDEX_COST_INDEX;
else
return COST_INVALID - 1;
}
@Override
public long subCost(ArrayList<FromItem> costItems)
{
if (costItems.contains(_fromItem))
return 0;
else
return COST_INVALID;
}
@Override
public Expr bind(Query query)
{
FromItem []fromItems = query.getFromItems();
for (int i = 0; i < fromItems.length; i++) {
if (fromItems[i] == _fromItem) {
_tableIndex = i;
return this;
}
}
throw new IllegalStateException();
}
/**
* Returns true if the expression is null.
*/
public boolean isNull(QueryContext context)
throws SQLException
{
return false;
}
/**
* Evaluates the expression as a string.
*/
public String evalString(QueryContext context)
throws SQLException
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
return String.valueOf(row.getRowAddress());
}
public int evalInt(QueryContext context)
throws SQLException
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
return (int) row.getRowAddress();
}
@Override
public long evalLong(QueryContext context)
throws SQLException
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
return row.getRowAddress();
}
@Override
public double evalDouble(QueryContext context)
throws SQLException
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
return row.getRowAddress();
}
/**
* Evaluates the expression, writing to the result stream.
*
* @param context the query context
* @param result the output result
*/
@Override
public void evalToResult(QueryContext context, SelectResult result)
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
result.writeLong(row.getRowAddress());
}
public String toString()
{
return getClass().getSimpleName() + "[" + _fromItem + "," + _tableIndex + "]";
}
}