/*
* 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.table;
import java.sql.SQLException;
import com.caucho.db.block.BlockStore;
import com.caucho.db.sql.Expr;
import com.caucho.db.sql.QueryContext;
import com.caucho.db.sql.SelectResult;
import com.caucho.db.xa.DbTransaction;
import com.caucho.util.L10N;
/**
* Represents the 64-bit long identity value
*/
class IdentityColumn extends Column {
private static final L10N L = new L10N(IdentityColumn.class);
/**
* Creates an identity column.
*
* @param row the row the column is being added to
* @param name the column's name
*/
IdentityColumn(Row row, String name)
{
super(row, name);
setPrimaryKey(true);
}
/**
* Returns the column's type code.
*/
@Override
public ColumnType getTypeCode()
{
return ColumnType.IDENTITY;
}
/**
* Returns the column's Java type.
*/
@Override
public Class<?> getJavaType()
{
return long.class;
}
/**
* Returns the column's declaration size.
*/
@Override
public int getDeclarationSize()
{
return 0;
}
/**
* Returns the column's length
*/
@Override
public int getLength()
{
return 0;
}
/**
* Returns true if the column is null.
*
* @param block the block's buffer
* @param rowOffset the offset of the row in the block
*/
@Override
public boolean isNull(byte []block, int rowOffset)
{
return false;
}
/**
* Sets a string value in the column.
*
* @param block the block's buffer
* @param rowOffset the offset of the row in the block
* @param value the value to store
*/
@Override
void setString(DbTransaction xa, byte []block, int rowOffset, String str)
{
throw new IllegalStateException(L.l("an IDENTITY column cannot be set"));
}
/**
* Gets a string value from the column.
*
* @param block the block's buffer
* @param rowOffset the offset of the row in the block
*/
@Override
public String getString(long blockId, byte []block, int rowOffset)
{
return "0x" + Long.toHexString(getLong(blockId, block, rowOffset));
}
/**
* Sets an integer value in the column.
*
* @param block the block's buffer
* @param rowOffset the offset of the row in the block
* @param value the value to store
*/
@Override
void setInteger(DbTransaction xa, byte []block, int rowOffset, int value)
{
throw new UnsupportedOperationException(getClass().getName());
}
/**
* Gets an integer value from the column.
*
* @param block the block's buffer
* @param rowOffset the offset of the row in the block
*/
@Override
public int getInteger(long blockId, byte []block, int rowOffset)
{
return (int) getLong(blockId, block, rowOffset);
}
/**
* Sets a long value in the column.
*
* @param block the block's buffer
* @param rowOffset the offset of the row in the block
* @param value the value to store
*/
@Override
void setLong(DbTransaction xa, byte []block, int rowOffset, long value)
{
throw new UnsupportedOperationException(getClass().getName());
}
/**
* Gets a long value from the column.
*
* @param block the block's buffer
* @param rowOffset the offset of the row in the block
*/
@Override
public long getLong(long blockId, byte []block, int rowOffset)
{
return (blockId & BlockStore.BLOCK_MASK) + rowOffset;
}
/**
* Gets an integer value from the column.
*
* @param block the block's buffer
* @param rowOffset the offset of the row in the block
*/
@Override
public double getDouble(long blockId, byte []block, int rowOffset)
{
return (double) getLong(blockId, block, rowOffset);
}
/**
* Sets the column based on an expression.
*
* @param block the block's buffer
* @param rowOffset the offset of the row in the block
* @param expr the expression to store
*/
@Override
void setExpr(DbTransaction xa,
byte []block, int rowOffset,
Expr expr, QueryContext context)
throws SQLException
{
long value = expr.evalLong(context);
}
/**
* Sets based on an expression
*/
@Override
public void set(DbTransaction xa,
TableIterator iter, Expr expr, QueryContext context)
throws SQLException
{
throw new UnsupportedOperationException(getClass().getName());
}
/**
* Evaluates the column to a stream.
*/
@Override
public void evalToResult(long blockId, byte []block, int rowOffset,
SelectResult result)
{
result.writeLong((blockId & BlockStore.BLOCK_MASK) + rowOffset);
}
/**
* Evaluate to a buffer.
*
* @param block the block's buffer
* @param rowOffset the offset of the row in the block
* @param buffer the result buffer
* @param buffer the result buffer offset
*
* @return the length of the value
*/
@Override
int evalToBuffer(byte []block, int rowOffset,
byte []buffer, int bufferOffset)
throws SQLException
{
throw new UnsupportedOperationException(getClass().getName());
}
/**
* Returns true if the items in the given rows match.
*/
@Override
public boolean isEqual(byte []block1, int rowOffset1,
byte []block2, int rowOffset2)
{
throw new UnsupportedOperationException(getClass().getName());
}
}