/*
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided
* that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright
* statements and notices. Redistributions must also contain a
* copy of this document.
*
* 2. 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.
*
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* products derived from this Software without prior written
* permission of Intalio, Inc. For written permission,
* please contact info@exolab.org.
*
* 4. Products derived from this Software may not be called "Exolab"
* nor may "Exolab" appear in their names without prior written
* permission of Intalio, Inc. Exolab is a registered
* trademark of Intalio, Inc.
*
* 5. Due credit should be given to the Exolab Project
* (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESSED 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
* INTALIO, INC. OR ITS 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.
*
* Copyright 2000 (C) Intalio, Inc. All Rights Reserved.
*
* $Id$
*/
package org.exolab.castor.jdo.engine;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.sql.Clob;
import java.sql.SQLException;
/**
* This is an implementation of java.sql.Clob interface that is constructed
* from java.io.Reader, in needs information about the length of the stream
* (which is not provided by java.io.Reader interface).
* <p>
* It is useful for setting CLOB values in the database.
* <p>
* Note: This implementation does not attempt to implement features of JDBC3
* or JDBC4.
*
* @author <a href="mailto:on@ibis.odessa.ua">Oleg Nitz</a>
* @author <a href="mailto:adam_e@swbell.net">Adam Esterline</a>
* @version $Revision$
*/
public class ClobImpl implements Clob {
private final Reader _reader;
private final long _length;
/**
* Construct an ClobImpl instance.
* <br/>
* Examples:<br>
* new ClobImpl(new StringReader(str), str.length())<br>
* new ClobImpl(new FileReader(file), file.length())
*/
public ClobImpl(final Reader reader, final long length) {
_reader = reader;
_length = length;
}
public InputStream getAsciiStream() {
return new InputStream() {
public int read() throws IOException {
return _reader.read();
}
public int available() {
return (int) Math.min(_length, Integer.MAX_VALUE);
}
public void mark(final int readlimit) {
try {
_reader.mark(readlimit);
} catch (IOException ex) {
throw new UnsupportedOperationException(ex.toString());
}
}
public boolean markSupported() {
return _reader.markSupported();
}
public void reset() throws IOException {
_reader.reset();
}
public long skip(final long n) throws IOException {
return _reader.skip(n);
}
public void close() throws IOException {
_reader.close();
}
};
}
public Reader getCharacterStream() {
return _reader;
}
public long length() {
return _length;
}
public String getSubString(final long pos, final int length) throws SQLException {
char[] buf = new char[length];
try {
_reader.reset();
_reader.skip(pos - 1);
_reader.read(buf);
} catch (IOException ex) {
throw new SQLException(ex.toString());
}
return new String(buf);
}
/**
* Not implemented, I guess it is not needed for writing CLOB.
*/
public long position(final Clob searchstr, final long start) {
return 0;
}
/**
* Not implemented, I guess it is not needed for writing CLOB.
*/
public long position(final String searchstr, final long start) {
return 0;
}
/**
* Not implemented. Added to make ClobImpl compliant with
* JDBC 3.0, which is a part of JDK1.4.
*/
public OutputStream setAsciiStream(final long pos) throws SQLException {
return null;
}
/**
* Not implemented. Added to make ClobImpl compliant with JDBC 3.0, which is
* a part of JDK1.4.
*/
public Writer setCharacterStream(final long pos) throws SQLException {
return null;
}
/**
* Not implemented. Added to make ClobImpl compliant with JDBC 3.0, which is
* a part of JDK1.4.
*/
public int setString(final long pos, final String str) throws SQLException {
return -1;
}
/**
* Not implemented. Added to make ClobImpl compliant with
* JDBC 3.0, which is a part of JDK1.4.
*/
public int setString(final long pos, final String str, final int offset, final int len)
throws SQLException {
return -1;
}
/**
* Not implemented. Added to make ClobImpl compliant with
* JDBC 3.0, which is a part of JDK1.4.
*/
public void truncate(final long len) throws SQLException {
// Nothing here
}
/**
* Not implemented. Added to make ClobImpl compliant with
* JDBC 4.0, which is a part of JDK6.
*/
public Reader getCharacterStream(final long pos, final long length) {
return null;
}
/**
* Not implemented. Added to make ClobImpl compliant with
* JDBC 4.0, which is a part of JDK6.
*/
public void free() {
// Nothing here
}
}