Class Comparables

src/main/java/org/assertj/core/internal/Comparables.java:34–295

Reusable assertions for Comparable s. @author Alex Ruiz @author Joel Costigliola

 * @author Joel Costigliola
 */
public class Comparables {

  private static final Comparables INSTANCE = new Comparables();

  /**
   * Returns the singleton instance of this class based on {@link StandardComparisonStrategy}.
   * 
   * @return the singleton instance of this class based on {@link StandardComparisonStrategy}.
   */
  public static Comparables instance() {
    return INSTANCE;
  }

  @VisibleForTesting
  Failures failures = Failures.instance();
  final ComparisonStrategy comparisonStrategy;

  @VisibleForTesting
  Comparables() {
    this(StandardComparisonStrategy.instance());
  }

  public Comparables(ComparisonStrategy comparisonStrategy) {
    this.comparisonStrategy = comparisonStrategy;
  }

  @VisibleForTesting
  public Comparator<?> getComparator() {
    if (comparisonStrategy instanceof ComparatorBasedComparisonStrategy) {
      return ((ComparatorBasedComparisonStrategy) comparisonStrategy).getComparator();
    }
    return null;
  }

  @VisibleForTesting
  void setFailures(Failures failures) {
    this.failures = failures;
  }

  @VisibleForTesting
  void resetFailures() {
    this.failures = Failures.instance();
  }

  /**
   * Asserts that two T instances are equal.
   * 
   * @param info contains information about the assertion.
   * @param actual the actual value.
   * @param expected the expected value.
   * @throws AssertionError if the actual value is {@code null}.
   * @throws AssertionError if the actual value is not equal to the expected one. This method will throw a
   *           {@code org.junit.ComparisonFailure} instead if JUnit is in the classpath and the expected and actual
   *           values are not equal.
   */
  public <T> void assertEqual(AssertionInfo info, T actual, T expected) {
    assertNotNull(info, actual);
    if (areEqual(actual, expected))