//$Id: BlobImpl.java 4997 2004-12-18 18:48:20Z oneovthafew $
package org.hibernate.lob;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.SQLException;
/**
* A dummy implementation of <tt>java.sql.Blob</tt> that
* may be used to insert new data into a BLOB.
* @author Gavin King
*/
public class BlobImpl implements Blob {
private InputStream stream;
private int length;
private boolean needsReset = false;
public BlobImpl(byte[] bytes) {
this.stream = new ByteArrayInputStream(bytes);
this.length = bytes.length;
}
public BlobImpl(InputStream stream, int length) {
this.stream = stream;
this.length = length;
}
/**
* @see java.sql.Blob#length()
*/
public long length() throws SQLException {
return length;
}
/**
* @see java.sql.Blob#truncate(long)
*/
public void truncate(long pos) throws SQLException {
excep();
}
/**
* @see java.sql.Blob#getBytes(long, int)
*/
public byte[] getBytes(long pos, int len) throws SQLException {
excep(); return null;
}
/**
* @see java.sql.Blob#setBytes(long, byte[])
*/
public int setBytes(long pos, byte[] bytes) throws SQLException {
excep(); return 0;
}
/**
* @see java.sql.Blob#setBytes(long, byte[], int, int)
*/
public int setBytes(long pos, byte[] bytes, int i, int j)
throws SQLException {
excep(); return 0;
}
/**
* @see java.sql.Blob#position(byte[], long)
*/
public long position(byte[] bytes, long pos) throws SQLException {
excep(); return 0;
}
/**
* @see java.sql.Blob#getBinaryStream()
*/
public InputStream getBinaryStream() throws SQLException {
try {
if (needsReset) stream.reset();
}
catch (IOException ioe) {
throw new SQLException("could not reset reader");
}
needsReset = true;
return stream;
}
/**
* @see java.sql.Blob#setBinaryStream(long)
*/
public OutputStream setBinaryStream(long pos) throws SQLException {
excep(); return null;
}
/**
* @see java.sql.Blob#position(Blob, long)
*/
public long position(Blob blob, long pos) throws SQLException {
excep(); return 0;
}
private static void excep() {
throw new UnsupportedOperationException("Blob may not be manipulated from creating session");
}
}
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