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/EngineTask.java
if ( parameter != null )
		{
			assert parameter instanceof ParameterAttribute;
			return ( (ParameterAttribute) parameter ).getDisplayText( );
		}
		return null;
	}
	public void setParameterDisplayTexts( Map params )
	{
		Iterator iterator = params.entrySet( ).iterator( );
		while ( iterator.hasNext( ) )
		{
			Map.Entry entry = (Map.Entry) iterator.next( );
			String name = (String) entry.getKey( );
			String text = (String) entry.getValue( );
			setParameterDisplayText( name, text );
		}
	}
	public void setParameterDisplayText( String name, String displayText )
	{
		parameterChanged = true;
		Object parameter = inputValues.get( name );
		if ( parameter != null )
		{
			assert parameter instanceof ParameterAttribute;
			( (ParameterAttribute) parameter ).setDisplayText( displayText );
		}
		else
		{
			inputValues.put( name, new ParameterAttribute( null, displayText ) );