}

  Optional() {}

  /**
   * Returns {@code true} if this holder contains a (non-null) instance.
   *
   * <p><b>Comparison to {@code java.util.Optional}:</b> no differences.
   */
  public abstract boolean isPresent();

  /**
   * Returns the contained instance, which must be present. If the instance might be absent, use

 * the reference is "absent"); it is never said to "contain {@code null}".
 *
 * <p>A non-null {@code Optional<T>} reference can be used as a replacement for a nullable {@code T}
 * reference. It allows you to represent "a {@code T} that must be present" and a "a {@code T} that
 * might be absent" as two distinct types in your program, which can aid clarity.
 *
 * <p>Some uses of this class include
 *
 * <ul>

		}
		return ParseSecretKey(s)
	}
}

// IsPresent reports whether a KMS configuration is present.
// It returns an error if multiple KMS configurations are
// present or if one configuration is incomplete.
func IsPresent() (bool, error) {
	// isPresent reports whether at least one of the
	// given env. variables is present.
	isPresent := func(vars ...string) bool {
		for _, v := range vars {

			os.Setenv(k, v)
		}

		ok, err := IsPresent()
		if err != nil && !test.ShouldFail {
			t.Fatalf("Test %d: %v", i, err)
		}
		if err == nil && test.ShouldFail {
			t.Fatalf("Test %d: should have failed but succeeded", i)
		}

		if !test.ShouldFail && ok != test.IsPresent {
			t.Fatalf("Test %d: reported that KMS present=%v - want present=%v", i, ok, test.IsPresent)
		}
	}
}

var isPresentTests = []struct {

    /**
     * Returns {@code true} if there is a value present, otherwise {@code false}.
     *
     * @return {@code true} if there is a value present, otherwise {@code false}
     */
    boolean isPresent();

    /**
     * Returns a {@link Provider} whose value is the value of this provider, if present, otherwise the
     * given default value.
     *

            .map(Object::toString)
            .map(DefaultPluginId::new);

        StringBuilder builder = new StringBuilder();
        boolean typeRelevant = rootType.isPresent() && !typeIrrelevantInErrorMessage;
        if (typeRelevant) {
            if (pluginId.isPresent()) {
                builder.append("In plugin '")
                    .append(pluginId.get())
                    .append("' type '");
            } else {

        expect:
        property.present
        property.get() == 13

        when:
        property.convention((Number) null)
        property.get()

        then:
        def e = thrown(MissingValueException)
        e.message == "Cannot query the value of ${displayName} because it has no value available."

        and:
        !property.present
    }

                    .ifPresent(e -> params.put(Constants.SCHEDULED_JOB, e)).orElse(() -> {
                        logger.warn("Job {} is not found.", scheduledJob.getId());
                    });
            return params;
        };
        findJobByUniqueOf(LaJobUnique.of(id)).ifPresent(job -> {
            if (!job.isUnscheduled()) {

	// Otherwise, the metadata is corrupted.
	keyID, idPresent := metadata[MetaKeyID]
	b64KMSSealedKey, kmsKeyPresent := metadata[MetaDataEncryptionKey]
	if !idPresent && kmsKeyPresent {
		return keyID, kmsKey, sealedKey, Errorf("The object metadata is missing the internal KMS key-ID for SSE-S3")
	}
	if idPresent && !kmsKeyPresent {

        ex.cause.message == "Failing constructor"

        and:
        provider.isPresent()

        and:
        container.withType(DefaultTask).named("task").isPresent()

        and:
        container.named("task").isPresent()

        when:
        container.findByName("task")

        then:
        def ex2 = thrown(GradleException)