F extends @Nullable Object, T extends @Nullable Object>
      implements Supplier<T>, Serializable {
    final Function<? super F, T> function;
    final Supplier<F> supplier;

    SupplierComposition(Function<? super F, T> function, Supplier<F> supplier) {
      this.function = checkNotNull(function);
      this.supplier = checkNotNull(supplier);
    }

    @Override
    @ParametricNullness
    public T get() {

          F extends @Nullable Object, T extends @Nullable Object>
      implements Supplier<T>, Serializable {
    final Function<? super F, T> function;
    final Supplier<F> supplier;

    SupplierComposition(Function<? super F, T> function, Supplier<F> supplier) {
      this.function = checkNotNull(function);
      this.supplier = checkNotNull(supplier);
    }

    @Override
    @ParametricNullness
    public T get() {

     * @param key the key name
     * @param supplier the value supplier
     * @return the updated buffer
     */
    protected StringBuilder append(final StringBuilder buf, final String key, final Supplier<Object> supplier) {
        final StringBuilder tempBuf = new StringBuilder();
        tempBuf.append('"').append(key).append("\":");
        try {
            final Object value = supplier.get();
            if (value == null) {

    @Nullable Object get() throws Throwable;
  }

  @CanIgnoreReturnValue
  static <T extends Throwable> T assertThrows(
      Class<T> expectedThrowable, ThrowingSupplier supplier) {
    return doAssertThrows(expectedThrowable, supplier, /* userPassedSupplier= */ true);
  }

  @CanIgnoreReturnValue
  static <T extends Throwable> T assertThrows(
      Class<T> expectedThrowable, ThrowingRunnable runnable) {

     *
     * @param user the user object with new attribute values
     * @param adminEnv the supplier for admin environment
     * @param userDN the DN of the user entry
     * @param result the search results containing current attributes
     */
    protected void modifyUserAttributes(final User user, final Supplier<Hashtable<String, String>> adminEnv, final String userDN,
            final List<SearchResult> result) {

        StringBuilder buf = new StringBuilder();
        Supplier<Object> supplier = () -> null;

        monitorTarget.append(buf, "testKey", supplier);
        assertEquals("\"testKey\":null", buf.toString());
    }

    // Test append method with Integer value
    public void test_append_integerValue() {
        StringBuilder buf = new StringBuilder();
        Supplier<Object> supplier = () -> Integer.valueOf(123);

import com.google.common.base.Supplier;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Source of {@link LongAddable} objects that deals with GWT, Unsafe, and all that.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
final class LongAddables {
  private static final Supplier<LongAddable> SUPPLIER;

  static {
    Supplier<LongAddable> supplier;
    try {

    /**
     * Create the access context.
     * @param resource The access context resource.
     * @param userTypeSupplier The supplier of user type.
     * @param userBeanSupplier The supplier of user bean.
     * @param appTypeSupplier The supplier of application type.
     * @return The access context.
     */

  public void testExpiringMemoizedSupplierThreadSafe() throws Throwable {
    Function<Supplier<Boolean>, Supplier<Boolean>> memoizer =
        new Function<Supplier<Boolean>, Supplier<Boolean>>() {
          @Override
          public Supplier<Boolean> apply(Supplier<Boolean> supplier) {
            return Suppliers.memoizeWithExpiration(supplier, Long.MAX_VALUE, NANOSECONDS);
          }
        };
    testSupplierThreadSafe(memoizer);

            return defaultLocaleSupplier.get();
        }
        return Locale.ENGLISH;
    }

    /**
     * Sets the default locale supplier.
     *
     * @param localeSupplier
     *            the supplier for the default locale
     */
    public static void setDefault(final Supplier<Locale> localeSupplier) {
        defaultLocaleSupplier = localeSupplier;
    }