Bug 168318 [regression]Print doesn't work correctly when preview attached file through external browser[00]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
if ( dataEngine == null )
		{
			dataEngine = DataEngineFactory.getInstance( ).createDataEngine(
					this );
		}
		return dataEngine;
	}
	public void closeDataEngine( )
	{
		if ( dataEngine != null )
		{
			dataEngine.shutdown( );
			dataEngine = null;
		}
	}
	/**
	 * @param name
	 * @param value
	 */
	public void setParameterValue( String name, Object value )
	{
		Object parameter = params.get( name );
		if ( parameter instanceof ParameterAttribute )
		{
			( (ParameterAttribute) parameter ).setValue( value );
		}
		else
		{
			params.put( name, new ParameterAttribute( value, null ) );
		}