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/*-------------------------------------------------------------------------
*
* Copyright (c) 2004-2005, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgjdbc/org/postgresql/jdbc3/AbstractJdbc3Blob.java,v 1.8 2005/05/08 23:18:24 jurka Exp $
*
*-------------------------------------------------------------------------
*/
package org.postgresql.jdbc3;
import java.sql.SQLException;
import org.postgresql.largeobject.LargeObject;
public abstract class AbstractJdbc3Blob extends org.postgresql.jdbc2.AbstractJdbc2Blob
{
public AbstractJdbc3Blob(org.postgresql.PGConnection conn, int oid) throws SQLException
{
super(conn, oid);
}
/**
* Writes the given array of bytes to the <code>BLOB</code> value that
* this <code>Blob</code> object represents, starting at position
* <code>pos</code>, and returns the number of bytes written.
*
* @param pos the position in the <code>BLOB</code> object at which
* to start writing
* @param bytes the array of bytes to be written to the <code>BLOB</code>
* value that this <code>Blob</code> object represents
* @return the number of bytes written
* @exception SQLException if there is an error accessing the
* <code>BLOB</code> value
* @see #getBytes
* @since 1.4
*/
public int setBytes(long pos, byte[] bytes) throws SQLException
{
return setBytes(pos, bytes, 0, bytes.length);
}
/**
* Writes all or part of the given <code>byte</code> array to the
* <code>BLOB</code> value that this <code>Blob</code> object represents
* and returns the number of bytes written.
* Writing starts at position <code>pos</code> in the <code>BLOB</code>
* value; <code>len</code> bytes from the given byte array are written.
*
* @param pos the position in the <code>BLOB</code> object at which
* to start writing
* @param bytes the array of bytes to be written to this <code>BLOB</code>
* object
* @param offset the offset into the array <code>bytes</code> at which
* to start reading the bytes to be set
* @param len the number of bytes to be written to the <code>BLOB</code>
* value from the array of bytes <code>bytes</code>
* @return the number of bytes written
* @exception SQLException if there is an error accessing the
* <code>BLOB</code> value
* @see #getBytes
* @since 1.4
*/
public int setBytes(long pos, byte[] bytes, int offset, int len) throws SQLException
{
assertPosition(pos);
LargeObject lo = getLO();
lo.seek((int) (pos-1));
lo.write(bytes, offset, len);
return len;
}
/**
* Retrieves a stream that can be used to write to the <code>BLOB</code>
* value that this <code>Blob</code> object represents. The stream begins
* at position <code>pos</code>.
*
* @param pos the position in the <code>BLOB</code> value at which
* to start writing
* @return a <code>java.io.OutputStream</code> object to which data can
* be written
* @exception SQLException if there is an error accessing the
* <code>BLOB</code> value
* @see #getBinaryStream
* @since 1.4
*/
public java.io.OutputStream setBinaryStream(long pos) throws SQLException
{
assertPosition(pos);
LargeObject lo = getLO();
lo.seek((int) (pos-1));
return lo.getOutputStream();
}
/**
* Truncates the <code>BLOB</code> value that this <code>Blob</code>
* object represents to be <code>len</code> bytes in length.
*
* @param len the length, in bytes, to which the <code>BLOB</code> value
* that this <code>Blob</code> object represents should be truncated
* @exception SQLException if there is an error accessing the
* <code>BLOB</code> value
* @since 1.4
*/
public void truncate(long len) throws SQLException
{
throw org.postgresql.Driver.notImplemented(this.getClass(), "truncate(long)");
}
}
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