android/guava/src/com/google/common/collect/ImmutableSortedSetFauxverideShim.java

/*
 * Copyright (C) 2009 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import com.google.common.annotations.GwtIncompatible;

/**
 * "Overrides" the {@link ImmutableSet} static methods that lack {@link ImmutableSortedSet}
 * equivalents with deprecated, exception-throwing versions. This prevents accidents like the
 * following:
 *
 * <pre>{@code
 * List<Object> objects = ...;
 * // Sort them:
 * Set<Object> sorted = ImmutableSortedSet.copyOf(objects);
 * // BAD CODE! The returned set is actually an unsorted ImmutableSet!
 * }</pre>
 *
 * <p>While we could put the overrides in {@link ImmutableSortedSet} itself, it seems clearer to
 * separate these "do not call" methods from those intended for normal use.
 *
 * @author Chris Povirk
 */
@GwtIncompatible
abstract class ImmutableSortedSetFauxverideShim<E> extends ImmutableSet<E> {
  /**
   * Not supported. Use {@link ImmutableSortedSet#naturalOrder}, which offers better type-safety,
   * instead. This method exists only to hide {@link ImmutableSet#builder} from consumers of {@code
   * ImmutableSortedSet}.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Use {@link ImmutableSortedSet#naturalOrder}, which offers better type-safety.
   */
  @Deprecated
  public static <E> ImmutableSortedSet.Builder<E> builder() {
    throw new UnsupportedOperationException();
  }

  /**
   * Not supported. This method exists only to hide {@link ImmutableSet#builderWithExpectedSize}
   * from consumers of {@code ImmutableSortedSet}.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Not supported by ImmutableSortedSet.
   */
  @Deprecated
  public static <E> ImmutableSortedSet.Builder<E> builderWithExpectedSize(int expectedSize) {
    throw new UnsupportedOperationException();
  }

  /**
   * Not supported. <b>You are attempting to create a set that may contain a non-{@code Comparable}
   * element.</b> Proper calls will resolve to the version in {@code ImmutableSortedSet}, not this
   * dummy version.
   *
   * @throws UnsupportedOperationException always
   * @deprecated <b>Pass a parameter of type {@code Comparable} to use {@link
   *     ImmutableSortedSet#of(Comparable)}.</b>
   */
  @Deprecated
  public static <E> ImmutableSortedSet<E> of(E element) {
    throw new UnsupportedOperationException();
  }

  /**
   * Not supported. <b>You are attempting to create a set that may contain a non-{@code Comparable}
   * element.</b> Proper calls will resolve to the version in {@code ImmutableSortedSet}, not this
   * dummy version.
   *
   * @throws UnsupportedOperationException always
   * @deprecated <b>Pass the parameters of type {@code Comparable} to use {@link
   *     ImmutableSortedSet#of(Comparable, Comparable)}.</b>
   */
  @Deprecated
  public static <E> ImmutableSortedSet<E> of(E e1, E e2) {
    throw new UnsupportedOperationException();
  }

  /**
   * Not supported. <b>You are attempting to create a set that may contain a non-{@code Comparable}
   * element.</b> Proper calls will resolve to the version in {@code ImmutableSortedSet}, not this
   * dummy version.
   *
   * @throws UnsupportedOperationException always
   * @deprecated <b>Pass the parameters of type {@code Comparable} to use {@link
   *     ImmutableSortedSet#of(Comparable, Comparable, Comparable)}.</b>
   */
  @Deprecated
  public static <E> ImmutableSortedSet<E> of(E e1, E e2, E e3) {
    throw new UnsupportedOperationException();
  }

  /**
   * Not supported. <b>You are attempting to create a set that may contain a non-{@code Comparable}
   * element.</b> Proper calls will resolve to the version in {@code ImmutableSortedSet}, not this
   * dummy version.
   *
   * @throws UnsupportedOperationException always
   * @deprecated <b>Pass the parameters of type {@code Comparable} to use {@link
   *     ImmutableSortedSet#of(Comparable, Comparable, Comparable, Comparable)}. </b>
   */
  @Deprecated
  public static <E> ImmutableSortedSet<E> of(E e1, E e2, E e3, E e4) {
    throw new UnsupportedOperationException();
  }

  /**
   * Not supported. <b>You are attempting to create a set that may contain a non-{@code Comparable}
   * element.</b> Proper calls will resolve to the version in {@code ImmutableSortedSet}, not this
   * dummy version.
   *
   * @throws UnsupportedOperationException always
   * @deprecated <b>Pass the parameters of type {@code Comparable} to use {@link
   *     ImmutableSortedSet#of( Comparable, Comparable, Comparable, Comparable, Comparable)}. </b>
   */
  @Deprecated
  public static <E> ImmutableSortedSet<E> of(E e1, E e2, E e3, E e4, E e5) {
    throw new UnsupportedOperationException();
  }

  /**
   * Not supported. <b>You are attempting to create a set that may contain a non-{@code Comparable}
   * element.</b> Proper calls will resolve to the version in {@code ImmutableSortedSet}, not this
   * dummy version.
   *
   * @throws UnsupportedOperationException always
   * @deprecated <b>Pass the parameters of type {@code Comparable} to use {@link
   *     ImmutableSortedSet#of(Comparable, Comparable, Comparable, Comparable, Comparable,
   *     Comparable, Comparable...)}. </b>
   */
  @Deprecated
  public static <E> ImmutableSortedSet<E> of(E e1, E e2, E e3, E e4, E e5, E e6, E... remaining) {
    throw new UnsupportedOperationException();
  }

  /**
   * Not supported. <b>You are attempting to create a set that may contain non-{@code Comparable}
   * elements.</b> Proper calls will resolve to the version in {@code ImmutableSortedSet}, not this
   * dummy version.
   *
   * @throws UnsupportedOperationException always
   * @deprecated <b>Pass parameters of type {@code Comparable} to use {@link
   *     ImmutableSortedSet#copyOf(Comparable[])}.</b>
   */
  @Deprecated
  public static <E> ImmutableSortedSet<E> copyOf(E[] elements) {
    throw new UnsupportedOperationException();
  }

  /*
   * We would like to include an unsupported "<E> copyOf(Iterable<E>)" here,
   * providing only the properly typed
   * "<E extends Comparable<E>> copyOf(Iterable<E>)" in ImmutableSortedSet (and
   * likewise for the Iterator equivalent). However, due to a change in Sun's
   * interpretation of the JLS (as described at
   * http://bugs.sun.com/view_bug.do?bug_id=6182950), the OpenJDK 7 compiler
   * available as of this writing rejects our attempts. To maintain
   * compatibility with that version and with any other compilers that interpret
   * the JLS similarly, there is no definition of copyOf() here, and the
   * definition in ImmutableSortedSet matches that in ImmutableSet.
   *
   * The result is that ImmutableSortedSet.copyOf() may be called on
   * non-Comparable elements. We have not discovered a better solution. In
   * retrospect, the static factory methods should have gone in a separate class
   * so that ImmutableSortedSet wouldn't "inherit" too-permissive factory
   * methods from ImmutableSet.
   */
}