/*
MariaDB Client for Java
Copyright (c) 2012-2014 Monty Program Ab.
Copyright (c) 2015-2016 MariaDB Ab.
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free
Software Foundation; either version 2.1 of the License, or (at your option)
any later version.
This library 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. See the GNU Lesser General Public License
for more details.
You should have received a copy of the GNU Lesser General Public License along
with this library; if not, write to Monty Program Ab info@montyprogram.com.
This particular MariaDB Client for Java file is work
derived from a Drizzle-JDBC. Drizzle-JDBC file which is covered by subject to
the following copyright and notice provisions:
Copyright (c) 2009-2011, Marcus Eriksson
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 driver nor the names of its contributors may not 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 THE COPYRIGHT HOLDER 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.mariadb.jdbc;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.sql.Clob;
import java.sql.NClob;
import java.sql.SQLException;
public class MariaDbClob extends MariaDbBlob implements Clob, NClob, Serializable {
private static final long serialVersionUID = -2006825230517923067L;
public MariaDbClob(byte[] bytes) {
super(bytes);
}
public MariaDbClob() {
super();
}
/**
* ToString implementation.
*
* @return string value of blob content.
*/
public String toString() {
try {
return new String(blobContent, StandardCharsets.UTF_8);
} catch (Exception e) {
throw new AssertionError(e);
}
}
/**
* Get sub string.
*
* @param pos position
* @param length length of sub string
* @return substring
* @throws SQLException if position is not possible
*/
public String getSubString(long pos, int length) throws SQLException {
try {
return toString().substring((int) pos - 1, (int) pos - 1 + length);
} catch (Exception e) {
throw new SQLException(e);
}
}
public Reader getCharacterStream() throws SQLException {
return new StringReader(toString());
}
public Reader getCharacterStream(long pos, long length) throws SQLException {
String sub = toString().substring((int) pos - 1, (int) pos - 1 + (int) length);
return new StringReader(sub);
}
/**
* Set character stream.
*
* @param pos position
* @return writer
* @throws SQLException if position is invalid
*/
public Writer setCharacterStream(long pos) throws SQLException {
int bytePosition = utf8Position((int) pos - 1);
OutputStream stream = setBinaryStream(bytePosition + 1);
return new OutputStreamWriter(stream, StandardCharsets.UTF_8);
}
public InputStream getAsciiStream() throws SQLException {
return getBinaryStream();
}
public long position(String searchstr, long start) throws SQLException {
return toString().indexOf(searchstr, (int) start - 1);
}
public long position(Clob searchstr, long start) throws SQLException {
return position(searchstr.toString(), start);
}
/**
* Convert character position into byte position in UTF8 byte array.
*
* @param charPosition charPosition
* @return byte position
*/
private int utf8Position(int charPosition) {
int pos = 0;
for (int i = 0; i < charPosition; i++) {
int content = blobContent[pos] & 0xff;
if (content < 0x80) {
pos += 1;
} else if (content < 0xC2) {
throw new AssertionError("invalid UTF8");
} else if (content < 0xE0) {
pos += 2;
} else if (content < 0xF0) {
pos += 3;
} else if (content < 0xF8) {
pos += 4;
} else {
throw new AssertionError("invalid UTF8");
}
}
return pos;
}
/**
* Set String.
*
* @param pos position
* @param str string
* @return string length
* @throws SQLException if UTF-8 convertion failed
*/
public int setString(long pos, String str) throws SQLException {
int bytePosition = utf8Position((int) pos - 1);
try {
super.setBytes(bytePosition + 1, str.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
//eat exception, UTF-8 is a known charset
}
return str.length();
}
public int setString(long pos, String str, int offset, int len) throws SQLException {
return setString(pos, str.substring(offset, offset + len));
}
public OutputStream setAsciiStream(long pos) throws SQLException {
return setBinaryStream(utf8Position((int) pos - 1) + 1);
}
/**
* Return character length of the Clob. Assume UTF8 encoding.
*/
@Override
public long length() {
long len = 0;
for (int i = 0; i < actualSize; ) {
int content = blobContent[i] & 0xff;
if (content < 0x80) {
i += 1;
} else if (content < 0xC2) {
throw new AssertionError("invalid UTF8");
} else if (content < 0xE0) {
i += 2;
} else if (content < 0xF0) {
i += 3;
} else if (content < 0xF8) {
i += 4;
} else {
throw new AssertionError("invalid UTF8");
}
len++;
}
return len;
}
}