Bug 178164 Use IEngineTask.status constants and remove unnecessary status variables in EngineTask.
1)Remove following redundant variables in EngineTask used for status info. protected final int RUNNING_STATUS_START = 0; protected final int RUNNING_STATUS_RUNNING = 1; protected final int RUNNING_STATUS_STOP = 2; EngineTask already has access to constants declared in IEngineTask. Use those instead. 2)Remove the unused errorHandlingOption in EngineTask.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/RenderTask.java
this.offset = reportDoc.getInstanceOffset( iid );
			if ( offset == -1 )
			{
				throw new EngineException(
					"Invalid instance id :" + iid ); 
			}
		}
		ReportletRender( String bookmark ) throws EngineException
		{
			this.offset = reportDoc.getBookmarkOffset( bookmark );
			if ( offset == -1 )
			{
				throw new EngineException(
					"Invalid bookmark :" + bookmark ); 
			}
		}
		protected IReportExecutor createReader( )
		{
			return new ReportletReader( executionContext, offset );
		}
		protected void load( ReportContentLoader loader, IContentEmitter emitter )
		{
			loader.loadReportlet( offset, emitter );
		}
	}
	public void setInstanceID( String iid ) throws EngineException
	{
		setInstanceID( InstanceID.parse( iid ) );
	}
}