001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.actions.upload;
003
004import static org.openstreetmap.josm.tools.I18n.tr;
005
006import java.util.ArrayList;
007import java.util.List;
008import java.util.Stack;
009
010import org.openstreetmap.josm.data.osm.Relation;
011
012public class CyclicUploadDependencyException extends Exception {
013    private final Stack<Relation> cycle;
014
015    public CyclicUploadDependencyException(Stack<Relation> cycle) {
016        this.cycle = cycle;
017    }
018
019    protected String formatRelation(Relation r) {
020        StringBuilder sb = new StringBuilder();
021        if (r.getName() != null) {
022            sb.append("'").append(r.getName()).append("'");
023        } else if (!r.isNew()) {
024            sb.append(r.getId());
025        } else {
026            sb.append("relation@").append(r.hashCode());
027        }
028        return sb.toString();
029    }
030
031    @Override
032    public String getMessage() {
033        StringBuilder sb = new StringBuilder();
034        sb.append(tr("Cyclic dependency between relations:"));
035        sb.append("[");
036        for (int i=0; i< cycle.size(); i++) {
037            if (i >0 ) {
038                sb.append(",");
039            }
040            sb.append(formatRelation(cycle.get(i)));
041        }
042        sb.append("]");
043        return sb.toString();
044    }
045
046    public List<Relation> getCyclicUploadDependency() {
047        return new ArrayList<>(cycle);
048    }
049}