/*
* 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.blob.BlobInputStream;
import com.caucho.db.block.BlockStore;
import com.caucho.db.table.Column;
import com.caucho.db.table.TableIterator;
import com.caucho.db.table.Column.ColumnType;
import com.caucho.sql.SQLExceptionWrapper;
import com.caucho.util.CharBuffer;
import com.caucho.util.FreeList;
import com.caucho.util.L10N;
import com.caucho.util.QDate;
import com.caucho.vfs.ReadStream;
import com.caucho.vfs.TempBuffer;
import com.caucho.vfs.TempStream;
import com.caucho.vfs.WriteStream;
import java.io.IOException;
import java.sql.SQLException;
public class SelectResultSetImpl extends ResultSetImpl {
private static final L10N L = new L10N(SelectResultSetImpl.class);
private static final FreeList<SelectResultSetImpl> _freeList =
new FreeList<SelectResultSetImpl>(16);
private final WriteStream _ws;
private final TempBuffer _buf;
private final ReadStream _rs;
private final byte []_buffer;
private final CharBuffer _cb;
private final TempStream _ts;
private static QDate _date = new QDate();
private Expr []_exprs;
private ColumnType []_types = new ColumnType[32];
private int []_offsets = new int[32];
private int []_lengths = new int[32];
private BlockStore []_stores = new BlockStore[32];
private TableIterator []_rows;
private int _lastColumn;
private SelectResultSetImpl()
{
_ws = new WriteStream();
_ws.setReuseBuffer(true);
_ts = new TempStream();
_rs = new ReadStream();
_rs.setReuseBuffer(true);
_buf = TempBuffer.allocate();
_buffer = _buf.getBuffer();
_cb = new CharBuffer();
_rows = new TableIterator[0];
}
public static SelectResultSetImpl create(Expr []exprs)
{
SelectResultSetImpl rs = _freeList.allocate();
if (rs == null)
rs = new SelectResultSetImpl();
rs.init(exprs);
return rs;
}
TableIterator []initRows(FromItem []fromItems)
{
if (_rows.length < fromItems.length)
_rows = new TableIterator[fromItems.length];
for (int i = 0; i < fromItems.length; i++) {
if (_rows[i] == null)
_rows[i] = new TableIterator();
_rows[i].init(fromItems[i].getTable());
}
return _rows;
}
private void init(Expr []exprs)
{
_exprs = exprs;
if (_offsets.length < _exprs.length) {
_offsets = new int[exprs.length];
_lengths = new int[exprs.length];
_types = new ColumnType[exprs.length];
_stores = new BlockStore[exprs.length];
}
for (int i = 0; i < exprs.length; i++) {
_stores[i] = exprs[i].getTable();
}
}
void initRead()
throws IOException
{
_ts.openRead(_rs);
}
WriteStream getWriteStream()
{
_ts.openWrite();
_ws.init(_ts);
return _ws;
}
public boolean next()
throws SQLException
{
try {
ReadStream rs = _rs;
_lastColumn = 0;
int hasData = rs.read();
if (hasData <= 0)
return false;
int length = 0;
int fields = _exprs.length;
byte []buffer = _buffer;
for (int i = 0; i < fields; i++) {
int type = rs.read();
int sublen = 0;
if (type < 0)
return false;
ColumnType cType = ColumnType.values()[type];
switch (cType) {
case NONE:
sublen = -1;
break;
case VARCHAR:
int l0 = rs.read();
int l1 = rs.read();
int l2 = rs.read();
int l3 = rs.read();
sublen = ((l0 << 24) +
(l1 << 16) +
(l2 << 8) +
(l3));
break;
case INT:
sublen = 4;
break;
case LONG:
case DOUBLE:
case DATE:
sublen = 8;
break;
case BLOB:
sublen = 128;
break;
default:
throw new SQLException("Unknown column: " + type);
}
_types[i] = cType;
_offsets[i] = length;
_lengths[i] = sublen;
if (sublen > 0) {
rs.read(buffer, length, sublen);
length += sublen;
}
}
return true;
} catch (IOException e) {
throw new SQLExceptionWrapper(e);
}
}
/**
* Returns the column index with the given name.
*/
public int findColumnIndex(String name)
throws SQLException
{
for (int i = 0; i < _exprs.length; i++) {
if (_exprs[i].getName().equals(name))
return i + 1;
}
throw new SQLException(L.l("column `{0}' does not exist.", name));
}
/**
* Returns the string value of the given index.
*/
public String getString(int index)
throws SQLException
{
_lastColumn = index;
byte []buffer = _buffer;
int offset = _offsets[index];
int length = _lengths[index];
switch (_types[index]) {
case NONE:
return null;
case INT:
{
int value = (((buffer[offset] & 0xff) << 24) +
((buffer[offset + 1] & 0xff) << 16) +
((buffer[offset + 2] & 0xff) << 8) +
((buffer[offset + 3] & 0xff)));
return String.valueOf(value);
}
case LONG:
{
long value = (((buffer[offset + 0] & 0xffL) << 56) +
((buffer[offset + 1] & 0xffL) << 48) +
((buffer[offset + 2] & 0xffL) << 40) +
((buffer[offset + 3] & 0xffL) << 32) +
((buffer[offset + 4] & 0xffL) << 24) +
((buffer[offset + 5] & 0xffL) << 16) +
((buffer[offset + 6] & 0xffL) << 8) +
((buffer[offset + 7] & 0xffL)));
return String.valueOf(value);
}
case DOUBLE:
{
long value = (((buffer[offset + 0] & 0xffL) << 56) +
((buffer[offset + 1] & 0xffL) << 48) +
((buffer[offset + 2] & 0xffL) << 40) +
((buffer[offset + 3] & 0xffL) << 32) +
((buffer[offset + 4] & 0xffL) << 24) +
((buffer[offset + 5] & 0xffL) << 16) +
((buffer[offset + 6] & 0xffL) << 8) +
((buffer[offset + 7] & 0xffL)));
return String.valueOf(Double.longBitsToDouble(value));
}
case DATE:
{
long value = (((buffer[offset + 0] & 0xffL) << 56) +
((buffer[offset + 1] & 0xffL) << 48) +
((buffer[offset + 2] & 0xffL) << 40) +
((buffer[offset + 3] & 0xffL) << 32) +
((buffer[offset + 4] & 0xffL) << 24) +
((buffer[offset + 5] & 0xffL) << 16) +
((buffer[offset + 6] & 0xffL) << 8) +
((buffer[offset + 7] & 0xffL)));
return QDate.formatGMT(value);
}
case VARCHAR:
return getStringValue(index);
case BLOB:
return getBlobString(index);
default:
return null;
}
}
/**
* Returns the string value for the result set.
*/
private String getStringValue(int index)
throws SQLException
{
_lastColumn = index;
int length = _lengths[index];
int offset = _offsets[index];
if (length < 0)
return null;
CharBuffer cb = _cb;
cb.clear();
byte []buffer = _buffer;
for (; length > 0; length--) {
cb.append((char) buffer[offset++]);
}
return cb.toString();
}
/**
* Returns the string value for the result set.
*/
private String getBlobString(int index)
throws SQLException
{
_lastColumn = index;
int offset = _offsets[index];
CharBuffer cb = _cb;
cb.clear();
BlobInputStream is = null;
try {
is = new BlobInputStream(_stores[index], _buffer, offset);
int ch;
while ((ch = is.read()) >= 0) {
if (ch < 0x80)
cb.append((char) ch);
}
} catch (IOException e) {
throw new SQLExceptionWrapper(e);
}
return cb.toString();
}
public int getInt(int index)
throws SQLException
{
_lastColumn = index;
byte []buffer = _buffer;
int offset = _offsets[index];
int length = _lengths[index];
switch (_types[index]) {
case NONE:
return 0;
case INT:
return (((buffer[offset + 0] & 0xff) << 24) +
((buffer[offset + 1] & 0xff) << 16) +
((buffer[offset + 2] & 0xff) << 8) +
((buffer[offset + 3] & 0xff)));
case LONG:
{
long value = (((buffer[offset + 0] & 0xffL) << 56) +
((buffer[offset + 1] & 0xffL) << 48) +
((buffer[offset + 2] & 0xffL) << 40) +
((buffer[offset + 3] & 0xffL) << 32) +
((buffer[offset + 4] & 0xffL) << 24) +
((buffer[offset + 5] & 0xffL) << 16) +
((buffer[offset + 6] & 0xffL) << 8) +
((buffer[offset + 7] & 0xffL)));
return (int) value;
}
case DOUBLE:
{
long value = (((buffer[offset + 0] & 0xffL) << 56) +
((buffer[offset + 1] & 0xffL) << 48) +
((buffer[offset + 2] & 0xffL) << 40) +
((buffer[offset + 3] & 0xffL) << 32) +
((buffer[offset + 4] & 0xffL) << 24) +
((buffer[offset + 5] & 0xffL) << 16) +
((buffer[offset + 6] & 0xffL) << 8) +
((buffer[offset + 7] & 0xffL)));
return (int) Double.longBitsToDouble(value);
}
case VARCHAR:
return Integer.parseInt(getString(index));
default:
return 0;
}
}
public long getLong(int index)
throws SQLException
{
_lastColumn = index;
byte []buffer = _buffer;
int offset = _offsets[index];
int length = _lengths[index];
switch (_types[index]) {
case NONE:
return 0;
case INT:
return (((buffer[offset] & 0xff) << 24) +
((buffer[offset + 1] & 0xff) << 16) +
((buffer[offset + 2] & 0xff) << 8) +
((buffer[offset + 3] & 0xff)));
case LONG:
case DATE:
{
long value = (((buffer[offset + 0] & 0xffL) << 56) +
((buffer[offset + 1] & 0xffL) << 48) +
((buffer[offset + 2] & 0xffL) << 40) +
((buffer[offset + 3] & 0xffL) << 32) +
((buffer[offset + 4] & 0xffL) << 24) +
((buffer[offset + 5] & 0xffL) << 16) +
((buffer[offset + 6] & 0xffL) << 8) +
((buffer[offset + 7] & 0xffL)));
return value;
}
case DOUBLE:
{
long value = (((buffer[offset + 0] & 0xffL) << 56) +
((buffer[offset + 1] & 0xffL) << 48) +
((buffer[offset + 2] & 0xffL) << 40) +
((buffer[offset + 3] & 0xffL) << 32) +
((buffer[offset + 4] & 0xffL) << 24) +
((buffer[offset + 5] & 0xffL) << 16) +
((buffer[offset + 6] & 0xffL) << 8) +
((buffer[offset + 7] & 0xffL)));
return (long) Double.longBitsToDouble(value);
}
case VARCHAR:
return Long.parseLong(getString(index));
default:
return 0;
}
}
/**
* Returns a double value from this column.
*/
public double getDouble(int index)
throws SQLException
{
_lastColumn = index;
byte []buffer = _buffer;
int offset = _offsets[index];
int length = _lengths[index];
switch (_types[index]) {
case NONE:
return 0;
case INT:
return (((buffer[offset + 0] & 0xff) << 24) +
((buffer[offset + 1] & 0xff) << 16) +
((buffer[offset + 2] & 0xff) << 8) +
((buffer[offset + 3] & 0xff)));
case LONG:
{
long value = (((buffer[offset + 0] & 0xffL) << 56) +
((buffer[offset + 1] & 0xffL) << 48) +
((buffer[offset + 2] & 0xffL) << 40) +
((buffer[offset + 3] & 0xffL) << 32) +
((buffer[offset + 4] & 0xffL) << 24) +
((buffer[offset + 5] & 0xffL) << 16) +
((buffer[offset + 6] & 0xffL) << 8) +
((buffer[offset + 7] & 0xffL)));
return value;
}
case DOUBLE:
{
long value = (((buffer[offset + 0] & 0xffL) << 56) +
((buffer[offset + 1] & 0xffL) << 48) +
((buffer[offset + 2] & 0xffL) << 40) +
((buffer[offset + 3] & 0xffL) << 32) +
((buffer[offset + 4] & 0xffL) << 24) +
((buffer[offset + 5] & 0xffL) << 16) +
((buffer[offset + 6] & 0xffL) << 8) +
((buffer[offset + 7] & 0xffL)));
return Double.longBitsToDouble(value);
}
case VARCHAR:
return Double.parseDouble(getString(index));
default:
return 0;
}
}
public long getDate(int index)
throws SQLException
{
_lastColumn = index;
byte []buffer = _buffer;
int offset = _offsets[index];
int length = _lengths[index];
switch (_types[index]) {
case NONE:
return 0;
case LONG:
case DATE:
{
long value = (((buffer[offset + 0] & 0xffL) << 56) +
((buffer[offset + 1] & 0xffL) << 48) +
((buffer[offset + 2] & 0xffL) << 40) +
((buffer[offset + 3] & 0xffL) << 32) +
((buffer[offset + 4] & 0xffL) << 24) +
((buffer[offset + 5] & 0xffL) << 16) +
((buffer[offset + 6] & 0xffL) << 8) +
((buffer[offset + 7] & 0xffL)));
return value;
}
case VARCHAR:
case BLOB:
{
String value = getString(index);
if (value == null)
return 0;
synchronized (_date) {
try {
return _date.parseDate(value);
} catch (Exception e) {
throw new SQLExceptionWrapper(e);
}
}
}
default:
throw new SQLException("unknown type:" + _types[index]);
}
}
/**
* Returns true if the last column read was null.
*/
public boolean wasNull()
{
if (_lastColumn < 0)
return false;
else
return _lengths[_lastColumn] < 0;
}
public void close()
{
_freeList.free(this);
}
}