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package com.structurizr.model;

/**
 * An ID generator that simply uses a sequential number when generating IDs for model elements and relationships.
 * This is the default ID generator; any non-numeric IDs are ignored.
 */
public class SequentialIntegerIdGeneratorStrategy implements IdGenerator {

    private int ID = 0;

    @Override
    public synchronized String generateId(Element element) {
        return "" + ++ID;
    }

    @Override
    public synchronized String generateId(Relationship relationship) {
        return "" + ++ID;
    }

    @Override
    public void found(String id) {
        try {
            int idAsInt = Integer.parseInt(id);
            if (idAsInt > ID) {
                ID = idAsInt;
            }
        } catch (NumberFormatException e) {
            // ignore non-numeric IDs
        }
    }

}