//$Id: ClobImpl.java 5683 2005-02-12 03:09:22Z oneovthafew $
package org.hibernate.lob;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringReader;
import java.io.Writer;
import java.sql.Clob;
import java.sql.SQLException;
/**
* A dummy implementation of <tt>java.sql.Clob</tt> that
* may be used to insert new data into a CLOB.
* @author Gavin King
*/
public class ClobImpl implements Clob {
private Reader reader;
private int length;
private boolean needsReset = false;
public ClobImpl(String string) {
reader = new StringReader(string);
length = string.length();
}
public ClobImpl(Reader reader, int length) {
this.reader = reader;
this.length = length;
}
/**
* @see java.sql.Clob#length()
*/
public long length() throws SQLException {
return length;
}
/**
* @see java.sql.Clob#truncate(long)
*/
public void truncate(long pos) throws SQLException {
excep();
}
/**
* @see java.sql.Clob#getAsciiStream()
*/
public InputStream getAsciiStream() throws SQLException {
try {
if (needsReset) reader.reset();
}
catch (IOException ioe) {
throw new SQLException("could not reset reader");
}
needsReset = true;
return new ReaderInputStream(reader);
}
/**
* @see java.sql.Clob#setAsciiStream(long)
*/
public OutputStream setAsciiStream(long pos) throws SQLException {
excep(); return null;
}
/**
* @see java.sql.Clob#getCharacterStream()
*/
public Reader getCharacterStream() throws SQLException {
try {
if (needsReset) reader.reset();
}
catch (IOException ioe) {
throw new SQLException("could not reset reader");
}
needsReset = true;
return reader;
}
/**
* @see java.sql.Clob#setCharacterStream(long)
*/
public Writer setCharacterStream(long pos) throws SQLException {
excep(); return null;
}
/**
* @see java.sql.Clob#getSubString(long, int)
*/
public String getSubString(long pos, int len) throws SQLException {
excep(); return null;
}
/**
* @see java.sql.Clob#setString(long, String)
*/
public int setString(long pos, String string) throws SQLException {
excep(); return 0;
}
/**
* @see java.sql.Clob#setString(long, String, int, int)
*/
public int setString(long pos, String string, int i, int j)
throws SQLException {
excep(); return 0;
}
/**
* @see java.sql.Clob#position(String, long)
*/
public long position(String string, long pos) throws SQLException {
excep(); return 0;
}
/**
* @see java.sql.Clob#position(Clob, long)
*/
public long position(Clob colb, long pos) throws SQLException {
excep(); return 0;
}
private static void excep() {
throw new UnsupportedOperationException("Blob may not be manipulated from creating session");
}
}
|