/*
* 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 com.caucho.db.table.Column;
import com.caucho.db.table.Table;
import com.caucho.util.L10N;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.logging.Logger;
class UnboundIdentifierExpr extends Expr {
private static final L10N L = new L10N(UnboundIdentifierExpr.class);
private String _table;
private String _column;
/**
* Creates an unbound identifier with just a column name.
*/
UnboundIdentifierExpr(String column)
{
_column = column;
}
/**
* Creates an unbound identifier with a table and a column name.
*/
UnboundIdentifierExpr(String table, String column)
{
_table = table;
_column = column;
}
/**
* The cost of a match of the expr.
*/
protected long lookupCost(ArrayList<FromItem> fromList)
{
Column column = findColumn(fromList);
if (column == null)
return Integer.MAX_VALUE;
FromItem fromItem = fromList.get(fromList.size() - 1);
Table table = fromItem.getTable();
column = table.getColumn(_column);
if (column == null)
return 100 * 100 * 100;
else if (column.isPrimaryKey())
return 100;
else if (column.isUnique())
return 100 * 100;
else
return 100 * 100 * 100;
}
/**
* The cost of a match of the expr.
*/
public long subCost(ArrayList<FromItem> fromList)
{
Column column = findColumn(fromList);
if (column == null)
return Integer.MAX_VALUE;
else
return 10 * 100 * 100 * 100;
}
/**
* Finds the column in the from list.
*/
private Column findColumn(ArrayList<FromItem> fromItems)
{
if (_table == null) {
for (int i = 0; i < fromItems.size(); i++) {
FromItem fromItem = fromItems.get(i);
Table table = fromItem.getTable();
Column column = table.getColumn(_column);
if (column != null)
return column;
}
return null;
}
else {
for (int i = 0; i < fromItems.size(); i++) {
FromItem fromItem = fromItems.get(i);
if (_table.equals(fromItem.getName())) {
Table table = fromItem.getTable();
return table.getColumn(_column);
}
}
return null;
}
}
public Expr bind(Query query)
throws SQLException
{
return query.bind(_table, _column);
}
public String toString()
{
if (_table != null)
return "UnboundIdentifier[" + _table + "," + _column + "]";
else
return "UnboundIdentifier[" + _column + "]";
}
}