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package org.opentripplanner.routing.services.notes;

import com.google.common.collect.HashMultimap;
import com.google.common.collect.SetMultimap;
import org.opentripplanner.routing.edgetype.TemporaryPartialStreetEdge;
import org.opentripplanner.routing.graph.Edge;

import java.util.Set;

/**
 * A notes source of dynamic notes, Usually created and modified by a single GraphUpdater.
 *
 * @author hannesj
 */
public class DynamicStreetNotesSource implements StreetNotesSource {

    private static final long serialVersionUID = 1L;

    /**
     * Notes for street edges. Volatile in order to guarantee that the access to notesForEdge is safe.
     */
    private volatile SetMultimap notesForEdge = HashMultimap.create();

    public DynamicStreetNotesSource() {
    }

    /**
     * Return the set of notes applicable for this state / backedge pair.
     *
     * @param edge The edge for which the notes will be returned.
     * @return The set of notes or null if empty.
     */
    @Override
    public Set getNotes(Edge edge) {
        /* If the edge is temporary, we look for notes in it's parent edge. */
        if (edge instanceof TemporaryPartialStreetEdge) {
            edge = ((TemporaryPartialStreetEdge) edge).getParentEdge();
        }
        Set maas = notesForEdge.get(edge);
        if (maas == null || maas.isEmpty()) {
            return null;
        }
        return maas;
    }

    /*
     * Update the NotesSource with a new set of notes.
     */
    public void setNotes(SetMultimap notes){
        this.notesForEdge = notes;
    }
}