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HSQLDB - Lightweight 100% Java SQL Database Engine
/* Copyright (c) 2001-2019, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb.rowio;
import java.math.BigDecimal;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.HsqlByteArrayInputStream;
import org.hsqldb.types.BinaryData;
import org.hsqldb.types.BlobData;
import org.hsqldb.types.ClobData;
import org.hsqldb.types.IntervalMonthData;
import org.hsqldb.types.IntervalSecondData;
import org.hsqldb.types.TimeData;
import org.hsqldb.types.TimestampData;
import org.hsqldb.types.Type;
import org.hsqldb.types.Types;
/**
* Base class for reading the data for a database row in different formats.
* Defines the methods that are independent of storage format and declares
* the format-dependent methods that subclasses should define.
*
* @author Bob Preston (sqlbob@users dot sourceforge.net)
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.5
* @since 1.7.0
*/
abstract class RowInputBase extends HsqlByteArrayInputStream {
static final int NO_POS = -1;
// fredt - initialisation may be unnecessary as it's done in resetRow()
protected long filePos = NO_POS;
protected int size;
RowInputBase() {
this(new byte[4]);
}
RowInputBase(int size) {
this(new byte[size]);
}
/**
* Constructor takes a complete row
*/
RowInputBase(byte[] buf) {
super(buf);
size = buf.length;
}
public long getFilePosition() {
if (filePos == NO_POS) {
// Trace.printSystemOut(Trace.DatabaseRowInput_getPos);
}
return filePos;
}
public int getSize() {
return size;
}
// fredt@users - comment - methods used for node and type data
public abstract int readType();
public abstract String readString();
// fredt@users - comment - methods used for SQL types
protected abstract boolean readNull();
protected abstract String readChar(Type type);
protected abstract Integer readSmallint();
protected abstract Integer readInteger();
protected abstract Long readBigint();
protected abstract Double readReal();
protected abstract BigDecimal readDecimal(Type type);
protected abstract Boolean readBoole();
protected abstract TimeData readTime(Type type);
protected abstract TimestampData readDate(Type type);
protected abstract TimestampData readTimestamp(Type type);
protected abstract IntervalMonthData readYearMonthInterval(Type type);
protected abstract IntervalSecondData readDaySecondInterval(Type type);
protected abstract Object readOther();
protected abstract BinaryData readUUID();
protected abstract BinaryData readBinary();
protected abstract BinaryData readBit();
protected abstract ClobData readClob();
protected abstract BlobData readBlob();
protected abstract Object[] readArray(Type type);
/**
* reads row data from a stream using the JDBC types in colTypes
*
* @param colTypes data types
*/
public Object[] readData(Type[] colTypes) {
int l = colTypes.length;
Object[] data = new Object[l];
for (int i = 0; i < l; i++) {
Type type = colTypes[i];
data[i] = readData(type);
}
return data;
}
public Object readData(Type type) {
Object o = null;
if (readNull()) {
return null;
}
switch (type.typeCode) {
case Types.SQL_ALL_TYPES :
break;
case Types.SQL_CHAR :
case Types.SQL_VARCHAR :
o = readChar(type);
break;
case Types.TINYINT :
case Types.SQL_SMALLINT :
o = readSmallint();
break;
case Types.SQL_INTEGER :
o = readInteger();
break;
case Types.SQL_BIGINT :
o = readBigint();
break;
case Types.SQL_REAL :
case Types.SQL_FLOAT :
case Types.SQL_DOUBLE :
o = readReal();
break;
case Types.SQL_NUMERIC :
case Types.SQL_DECIMAL :
o = readDecimal(type);
break;
case Types.SQL_DATE :
o = readDate(type);
break;
case Types.SQL_TIME :
case Types.SQL_TIME_WITH_TIME_ZONE :
o = readTime(type);
break;
case Types.SQL_TIMESTAMP :
case Types.SQL_TIMESTAMP_WITH_TIME_ZONE :
o = readTimestamp(type);
break;
case Types.SQL_INTERVAL_YEAR :
case Types.SQL_INTERVAL_YEAR_TO_MONTH :
case Types.SQL_INTERVAL_MONTH :
o = readYearMonthInterval(type);
break;
case Types.SQL_INTERVAL_DAY :
case Types.SQL_INTERVAL_DAY_TO_HOUR :
case Types.SQL_INTERVAL_DAY_TO_MINUTE :
case Types.SQL_INTERVAL_DAY_TO_SECOND :
case Types.SQL_INTERVAL_HOUR :
case Types.SQL_INTERVAL_HOUR_TO_MINUTE :
case Types.SQL_INTERVAL_HOUR_TO_SECOND :
case Types.SQL_INTERVAL_MINUTE :
case Types.SQL_INTERVAL_MINUTE_TO_SECOND :
case Types.SQL_INTERVAL_SECOND :
o = readDaySecondInterval(type);
break;
case Types.SQL_BOOLEAN :
o = readBoole();
break;
case Types.OTHER :
o = readOther();
break;
case Types.SQL_CLOB :
o = readClob();
break;
case Types.SQL_BLOB :
o = readBlob();
break;
case Types.SQL_ARRAY :
o = readArray(type);
break;
case Types.SQL_GUID :
o = readUUID();
break;
case Types.SQL_BINARY :
case Types.SQL_VARBINARY :
o = readBinary();
break;
case Types.SQL_BIT :
case Types.SQL_BIT_VARYING :
o = readBit();
break;
default :
throw Error.runtimeError(ErrorCode.U_S0500,
"RowInputBase - "
+ type.getNameString());
}
return o;
}
/**
* Used to reset the row, ready for a new row to be written into the
* byte[] buffer by an external routine.
*
*/
public void resetRow(long filepos, int rowsize) {
mark = 0;
reset();
if (buffer.length < rowsize) {
buffer = new byte[rowsize];
}
filePos = filepos;
size = count = rowsize;
pos = 4;
buffer[0] = (byte) ((rowsize >>> 24) & 0xFF);
buffer[1] = (byte) ((rowsize >>> 16) & 0xFF);
buffer[2] = (byte) ((rowsize >>> 8) & 0xFF);
buffer[3] = (byte) ((rowsize) & 0xFF);
}
/**
* Used to reset the row, ready for a new row to be written into the
* byte[] buffer by an external routine.
*
*/
public void resetBlock(long filepos, int rowsize) {
mark = 0;
reset();
if (buffer.length < rowsize) {
buffer = new byte[rowsize];
}
filePos = filepos;
size = count = rowsize;
}
public byte[] getBuffer() {
return buffer;
}
public int skipBytes(int n) {
throw Error.runtimeError(ErrorCode.U_S0500, "RowInputBase");
}
public String readLine() {
throw Error.runtimeError(ErrorCode.U_S0500, "RowInputBase");
}
}