/*
* 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.db.table.TableIterator;
import com.caucho.db.table.Column.ColumnType;
import java.sql.SQLException;
import java.util.logging.Logger;
final class ColumnExpr extends Expr {
private final Table _table;
private final int _tableIndex;
private final Column _column;
private final int _columnIndex;
private final String _name;
private final Class<?> _type;
ColumnExpr(String name, Table table, int tableIndex,
int columnIndex, Class<?> type)
{
_name = name;
_table = table;
_tableIndex = tableIndex;
_columnIndex = columnIndex;
_column = table.getColumns()[_columnIndex];
_type = type;
}
public Class getType()
{
return _type;
}
@Override
public ColumnType getTypeCode()
{
return getColumn().getTypeCode();
}
/**
* Returns any column name.
*/
public String getName()
{
return _name;
}
/**
* Returns the column.
*/
public Column getColumn()
{
return _column;
}
/**
* Returns the column's table.
*/
public Table getTable()
{
return _table;
}
/**
* Returns true if the column can contain a null value.
*/
public boolean isNullable()
{
return ! _column.isNotNull();
}
/**
* Returns true if the expression is null.
*/
final public boolean isNull(final QueryContext context)
throws SQLException
{
final TableIterator []rows = context.getTableIterators();
final TableIterator row = rows[_tableIndex];
return row.isNull(_column);
}
/**
* Evaluates the expression as a string.
*/
public String evalString(QueryContext context)
throws SQLException
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
return row.getString(_column);
}
public int evalInt(QueryContext context)
throws SQLException
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
return row.getInteger(_column);
}
public long evalLong(QueryContext context)
throws SQLException
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
return row.getLong(_column);
}
public final double evalDouble(final QueryContext context)
throws SQLException
{
final TableIterator []rows = context.getTableIterators();
final TableIterator row = rows[_tableIndex];
return row.getDouble(_column);
}
@Override
public int evalToBuffer(QueryContext context, byte []buffer, int offset)
throws SQLException
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
return row.getBuffer(_column, buffer, offset);
}
/**
* 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)
throws SQLException
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
row.evalToResult(_column, result);
}
public boolean evalEqual(QueryContext context, byte []matchBuffer)
throws SQLException
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
return row.isEqual(_column, matchBuffer);
}
public boolean evalEqual(QueryContext context, String string)
throws SQLException
{
TableIterator []rows = context.getTableIterators();
TableIterator row = rows[_tableIndex];
return row.isEqual(_column, string);
}
public boolean equals(Object o)
{
if (o == null || ! ColumnExpr.class.equals(o.getClass()))
return false;
ColumnExpr expr = (ColumnExpr) o;
return (_tableIndex == expr._tableIndex
&& _column == expr._column);
}
public String toString()
{
return "ColumnExpr[" + _tableIndex + "," + _columnIndex + "]";
}
}