package org.postgresql.largeobject;

// IMPORTANT NOTE: This file implements the JDBC 2 version of the driver.
// If you make any modifications to this file, you must make sure that the
// changes are also made (if relevent) to the related JDBC 1 class in the
// org.postgresql.jdbc1 package.


import java.lang.*;
import java.io.*;
import java.math.*;
import java.text.*;
import java.util.*;
import java.sql.*;
import org.postgresql.Field;
import org.postgresql.largeobject.*;
import org.postgresql.largeobject.*;

/**
 * This implements the Blob interface, which is basically another way to
 * access a LargeObject.
 *
 * $Id: PGblob.java,v 1.1 2000/04/17 20:07:52 peter Exp $
 *
 */
public class PGblob implements java.sql.Blob
{
    private org.postgresql.Connection conn;
    private int oid;
    private LargeObject lo;
    
    public PGblob(org.postgresql.Connection conn,int oid) throws SQLException {
	this.conn=conn;
	this.oid=oid;
	LargeObjectManager lom = conn.getLargeObjectAPI();
	this.lo = lom.open(oid);
    }
    
    public long length() throws SQLException {
	return lo.size();
    }
    
    public InputStream getBinaryStream() throws SQLException {
	return lo.getInputStream();
    }
    
    public byte[] getBytes(long pos,int length) throws SQLException {
	lo.seek((int)pos,LargeObject.SEEK_SET);
	return lo.read(length);
    }
    
    /*
     * For now, this is not implemented.
     */
    public long position(byte[] pattern,long start) throws SQLException {
	throw org.postgresql.Driver.notImplemented();
    }
    
    /*
     * This should be simply passing the byte value of the pattern Blob
     */
    public long position(Blob pattern,long start) throws SQLException {
	return position(pattern.getBytes(0,(int)pattern.length()),start);
    }
    
}