DatePatternChecker.java

import java.util.*;

public class DatePatternChecker implements PasswordPatternChecker {
    private final List<String> months;
    private final int yearStart;
    private final int yearEnd;

    public DatePatternChecker(List<String> months, int yearStart, int yearEnd) {
        this.months = months;
        this.yearStart = yearStart;
        this.yearEnd = yearEnd;
    }

    @Override
    public List<Finding> check(String password) {
        List<Finding> findings = new ArrayList<>();
        String pwLow = password.toLowerCase();
        boolean hasDate = password.matches(".*\\b(19|20)\\d{2}\\b.*");
        boolean hasMth = months.stream().anyMatch(pwLow::contains);
        boolean hasYear = false;
        for (int y = yearStart; y <= yearEnd; y++) {
            if (password.contains(String.valueOf(y))) { hasYear = true; break; }
        }
        if (hasDate || hasMth || hasYear) {
            findings.add(new Finding(
                Finding.Severity.HIGH,
                "Pattern data/anno rilevato",
                "Date e anni (specialmente di nascita o fondazione) riducono lo spazio di ricerca a poche migliaia di varianti."
            ));
        }
        return findings;
    }

    @Override
    public String getName() {
        return "Pattern data/anno";
    }
}