/*
Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FLOSS License Exception
<http://www.mysql.com/about/legal/licensing/foss-exception.html>.
This program 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; version 2
of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with this
program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.jdbc;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringReader;
import java.io.Writer;
import java.sql.SQLException;
/**
* Simplistic implementation of java.sql.Clob for MySQL Connector/J
*
* @author Mark Matthews
* @version $Id$
*/
public class Clob implements java.sql.Clob, OutputStreamWatcher, WriterWatcher {
private String charData;
private ExceptionInterceptor exceptionInterceptor;
Clob(ExceptionInterceptor exceptionInterceptor) {
this.charData = "";
this.exceptionInterceptor = exceptionInterceptor;
}
Clob(String charDataInit, ExceptionInterceptor exceptionInterceptor) {
this.charData = charDataInit;
this.exceptionInterceptor = exceptionInterceptor;
}
/**
* @see java.sql.Clob#getAsciiStream()
*/
public InputStream getAsciiStream() throws SQLException {
if (this.charData != null) {
return new ByteArrayInputStream(StringUtils.getBytes(this.charData));
}
return null;
}
/**
* @see java.sql.Clob#getCharacterStream()
*/
public Reader getCharacterStream() throws SQLException {
if (this.charData != null) {
return new StringReader(this.charData);
}
return null;
}
/**
* @see java.sql.Clob#getSubString(long, int)
*/
public String getSubString(long startPos, int length) throws SQLException {
if (startPos < 1) {
throw SQLError.createSQLException(Messages.getString("Clob.6"), //$NON-NLS-1$
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
int adjustedStartPos = (int)startPos - 1;
int adjustedEndIndex = adjustedStartPos + length;
if (this.charData != null) {
if (adjustedEndIndex > this.charData.length()) {
throw SQLError.createSQLException(Messages.getString("Clob.7"), //$NON-NLS-1$
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
return this.charData.substring(adjustedStartPos,
adjustedEndIndex);
}
return null;
}
/**
* @see java.sql.Clob#length()
*/
public long length() throws SQLException {
if (this.charData != null) {
return this.charData.length();
}
return 0;
}
/**
* @see java.sql.Clob#position(Clob, long)
*/
public long position(java.sql.Clob arg0, long arg1) throws SQLException {
return position(arg0.getSubString(0L, (int) arg0.length()), arg1);
}
/**
* @see java.sql.Clob#position(String, long)
*/
public long position(String stringToFind, long startPos)
throws SQLException {
if (startPos < 1) {
throw SQLError.createSQLException(
Messages.getString("Clob.8") //$NON-NLS-1$
+ startPos + Messages.getString("Clob.9"), SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor); //$NON-NLS-1$
}
if (this.charData != null) {
if ((startPos - 1) > this.charData.length()) {
throw SQLError.createSQLException(Messages.getString("Clob.10"), //$NON-NLS-1$
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
int pos = this.charData.indexOf(stringToFind, (int) (startPos - 1));
return (pos == -1) ? (-1) : (pos + 1);
}
return -1;
}
/**
* @see java.sql.Clob#setAsciiStream(long)
*/
public OutputStream setAsciiStream(long indexToWriteAt) throws SQLException {
if (indexToWriteAt < 1) {
throw SQLError.createSQLException(Messages.getString("Clob.0"), //$NON-NLS-1$
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
WatchableOutputStream bytesOut = new WatchableOutputStream();
bytesOut.setWatcher(this);
if (indexToWriteAt > 0) {
bytesOut.write(StringUtils.getBytes(this.charData), 0,
(int) (indexToWriteAt - 1));
}
return bytesOut;
}
/**
* @see java.sql.Clob#setCharacterStream(long)
*/
public Writer setCharacterStream(long indexToWriteAt) throws SQLException {
if (indexToWriteAt < 1) {
throw SQLError.createSQLException(Messages.getString("Clob.1"), //$NON-NLS-1$
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
WatchableWriter writer = new WatchableWriter();
writer.setWatcher(this);
//
// Don't call write() if nothing to write...
//
if (indexToWriteAt > 1) {
writer.write(this.charData, 0, (int) (indexToWriteAt - 1));
}
return writer;
}
/**
* @see java.sql.Clob#setString(long, String)
*/
public int setString(long pos, String str) throws SQLException {
if (pos < 1) {
throw SQLError.createSQLException(Messages.getString("Clob.2"), //$NON-NLS-1$
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
if (str == null) {
throw SQLError.createSQLException(Messages.getString("Clob.3"), //$NON-NLS-1$
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
StringBuffer charBuf = new StringBuffer(this.charData);
pos--;
int strLength = str.length();
charBuf.replace((int) pos, (int) (pos + strLength), str);
this.charData = charBuf.toString();
return strLength;
}
/**
* @see java.sql.Clob#setString(long, String, int, int)
*/
public int setString(long pos, String str, int offset, int len)
throws SQLException {
if (pos < 1) {
throw SQLError.createSQLException(Messages.getString("Clob.4"), //$NON-NLS-1$
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
if (str == null) {
throw SQLError.createSQLException(Messages.getString("Clob.5"), //$NON-NLS-1$
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
StringBuffer charBuf = new StringBuffer(this.charData);
pos--;
String replaceString = str.substring(offset, len);
charBuf.replace((int) pos, (int) (pos + replaceString.length()),
replaceString);
this.charData = charBuf.toString();
return len;
}
/**
* @see com.mysql.jdbc.OutputStreamWatcher#streamClosed(byte[])
*/
public void streamClosed(WatchableOutputStream out) {
int streamSize = out.size();
if (streamSize < this.charData.length()) {
try {
out.write(StringUtils
.getBytes(this.charData, null, null, false, null, this.exceptionInterceptor),
streamSize, this.charData.length() - streamSize);
} catch (SQLException ex) {
//
}
}
this.charData = StringUtils.toAsciiString(out.toByteArray());
}
/**
* @see java.sql.Clob#truncate(long)
*/
public void truncate(long length) throws SQLException {
if (length > this.charData.length()) {
throw SQLError.createSQLException(
Messages.getString("Clob.11") //$NON-NLS-1$
+ this.charData.length()
+ Messages.getString("Clob.12") + length + Messages.getString("Clob.13"), this.exceptionInterceptor); //$NON-NLS-1$ //$NON-NLS-2$
}
this.charData = this.charData.substring(0, (int) length);
}
/**
* @see com.mysql.jdbc.WriterWatcher#writerClosed(char[])
*/
public void writerClosed(char[] charDataBeingWritten) {
this.charData = new String(charDataBeingWritten);
}
/**
* @see com.mysql.jdbc.WriterWatcher#writerClosed(char[])
*/
public void writerClosed(WatchableWriter out) {
int dataLength = out.size();
if (dataLength < this.charData.length()) {
out.write(this.charData, dataLength, this.charData.length()
- dataLength);
}
this.charData = out.toString();
}
public void free() throws SQLException {
this.charData = null;
}
public Reader getCharacterStream(long pos, long length) throws SQLException {
return new StringReader(getSubString(pos, (int)length));
}
}