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/*******************************************************************************
 * Copyright (c) 2004, 2005 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/
package org.eclipse.birt.report.data.oda.jdbc;

import java.io.Reader;
import java.sql.SQLException;

import org.eclipse.datatools.connectivity.oda.IClob;
import org.eclipse.datatools.connectivity.oda.OdaException;
import org.eclipse.birt.report.data.oda.i18n.ResourceConstants;

/**
 * The Blob object implements interface IBlob
 */

public class Clob implements IClob
{
	/** the JDBC ResultSet object */
	private java.sql.Clob clob;
	
	public Clob( java.sql.Clob clobObj ) throws OdaException
	{
		this.clob = clobObj;
	}
	
	/*
	 * @see org.eclipse.datatools.connectivity.oda.IClob#getCharacterStream()
	 */
	public Reader getCharacterStream( ) throws OdaException
	{
		if ( clob == null )
			return null;
		try
		{
			return clob.getCharacterStream( );
		}
		catch ( SQLException e )
		{
			throw new JDBCException( ResourceConstants.RESULTSET_CANNOT_GET_CLOB_VALUE,
					e );
		}
	}

    /* 
     * @see org.eclipse.datatools.connectivity.oda.IClob#getSubString()
     */
	public String getSubString( long position, int length ) 
		throws OdaException
	{
        // TODO - replace with call to underlying JDBC driver
	    throw new UnsupportedOperationException();
	}

	/*
	 * @see org.eclipse.datatools.connectivity.oda.IClob#length()
	 */
	public long length( ) throws OdaException
	{
		if( clob == null ) return 0;
		try
		{
			return clob.length( );
		}
		catch ( SQLException e )
		{
			throw new JDBCException( ResourceConstants.RESULTSET_CANNOT_GET_CLOB_VALUE,
					e );
		}
	}
}