Parameters to the weighting class at runtime

rschifan · September 7, 2018, 1:24pm

Hi all,

would be possible to pass a parameter at run time to the weighting class? In the positive, how can I implement that?

Thanks,
Rossano

karussell · September 7, 2018, 2:03pm

Yes, it can be done through the hintsMap and the web service converts all URL parameters to them.

graphhopper/graphhopper/blob/master/core/src/main/java/com/graphhopper/GraphHopper.java#L907


 * created. Note that all URL parameters are available in the hintsMap as String if
 * you use the web module.
 *
 * @param hintsMap all parameters influencing the weighting. E.g. parameters coming via
 *                 GHRequest.getHints or directly via "&amp;api.xy=" from the URL of the web UI
 * @param encoder  the required vehicle
 * @param graph    The Graph enables the Weighting for NodeAccess and more
 * @return the weighting to be used for route calculation
 * @see HintsMap
 */
public Weighting createWeighting(HintsMap hintsMap, FlagEncoder encoder, Graph graph) {
    String weightingStr = toLowerCase(hintsMap.getWeighting());
    Weighting weighting = null;


    if (encoder.supports(GenericWeighting.class)) {
        weighting = new GenericWeighting((DataFlagEncoder) encoder, hintsMap);
    } else if ("shortest".equalsIgnoreCase(weightingStr)) {
        weighting = new ShortestWeighting(encoder);
    } else if ("fastest".equalsIgnoreCase(weightingStr) || weightingStr.isEmpty()) {
        if (encoder.supports(PriorityWeighting.class))
            weighting = new PriorityWeighting(encoder, hintsMap);

rschifan · September 8, 2018, 7:04pm

thanks!