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GraphHopper is a fast and memory efficient Java road routing engine working seamlessly with OpenStreetMap data.

There is a newer version: 10.0

package com.graphhopper.routing.util.parsers;

import com.graphhopper.reader.ReaderWay;
import com.graphhopper.routing.ev.EnumEncodedValue;
import com.graphhopper.routing.ev.HazmatWater;
import com.graphhopper.routing.ev.EdgeIntAccess;
import com.graphhopper.storage.IntsRef;


public class OSMHazmatWaterParser implements TagParser {

    private final EnumEncodedValue hazWaterEnc;

    public OSMHazmatWaterParser(EnumEncodedValue hazWaterEnc) {
        this.hazWaterEnc = hazWaterEnc;
    }

    @Override
    public void handleWayTags(int edgeId, EdgeIntAccess edgeIntAccess, ReaderWay readerWay, IntsRef relationFlags) {
        if (readerWay.hasTag("hazmat:water", "no")) {
            hazWaterEnc.setEnum(false, edgeId, edgeIntAccess, HazmatWater.NO);
        } else if (readerWay.hasTag("hazmat:water", "permissive")) {
            hazWaterEnc.setEnum(false, edgeId, edgeIntAccess, HazmatWater.PERMISSIVE);
        }
    }

}