org.testifyproject.google.common.graph.ElementOrder Maven / Gradle / Ivy

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/*
 * Copyright (C) 2016 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in org.testifyproject.testifyprojectpliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org.testifyproject/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 org.testifyproject.testifyproject.google.org.testifyproject.testifyprojectmon.graph;

import static org.testifyproject.testifyproject.google.org.testifyproject.testifyprojectmon.base.Preconditions.checkNotNull;
import static org.testifyproject.testifyproject.google.org.testifyproject.testifyprojectmon.base.Preconditions.checkState;

import org.testifyproject.testifyproject.google.org.testifyproject.testifyprojectmon.annotations.Beta;
import org.testifyproject.testifyproject.google.org.testifyproject.testifyprojectmon.base.MoreObjects;
import org.testifyproject.testifyproject.google.org.testifyproject.testifyprojectmon.base.MoreObjects.ToStringHelper;
import org.testifyproject.testifyproject.google.org.testifyproject.testifyprojectmon.base.Objects;
import org.testifyproject.testifyproject.google.org.testifyproject.testifyprojectmon.collect.Maps;
import org.testifyproject.testifyproject.google.org.testifyproject.testifyprojectmon.collect.Ordering;
import java.util.Comparator;
import java.util.Map;
import javax.annotation.Nullable;

/**
 * Used to represent the order of elements in a data structure that supports different options for
 * iteration order guarantees.
 *
 * Example usage:
 *
 * 
{@code
 * MutableGraph graph =
 *     GraphBuilder.directed().nodeOrder(ElementOrder.natural()).build();
 * }
 *
 * @author Joshua O'Madadhain
 * @since 20.0
 */
@Beta
public final class ElementOrder {
  private final Type type;

  @Nullable
  private final Comparator org.testifyproject.testifyprojectparator;

  /**
   * The type of ordering that this object specifies.
   *
   * 
   * UNORDERED: no order is guaranteed.
   * 
INSERTION: insertion ordering is guaranteed.
   * 
SORTED: ordering according to a supplied org.testifyproject.testifyprojectparator is guaranteed.
   * 
   */
  public enum Type {
    UNORDERED,
    INSERTION,
    SORTED
  }

  private ElementOrder(Type type, @Nullable Comparator org.testifyproject.testifyprojectparator) {
    this.type = checkNotNull(type);
    this.org.testifyproject.testifyprojectparator = org.testifyproject.testifyprojectparator;
    checkState((type == Type.SORTED) == (org.testifyproject.testifyprojectparator != null));
  }

  /** Returns an instance which specifies that no ordering is guaranteed. */
  public static  ElementOrder unordered() {
    return new ElementOrder(Type.UNORDERED, null);
  }

  /** Returns an instance which specifies that insertion ordering is guaranteed. */
  public static  ElementOrder insertion() {
    return new ElementOrder(Type.INSERTION, null);
  }

  /**
   * Returns an instance which specifies that the natural ordering of the elements is guaranteed.
   */
  public static > ElementOrder natural() {
    return new ElementOrder(Type.SORTED, Ordering.natural());
  }

  /**
   * Returns an instance which specifies that the ordering of the elements is guaranteed to be
   * determined by {@code org.testifyproject.testifyprojectparator}.
   */
  public static  ElementOrder sorted(Comparator org.testifyproject.testifyprojectparator) {
    return new ElementOrder(Type.SORTED, org.testifyproject.testifyprojectparator);
  }

  /** Returns the type of ordering used. */
  public Type type() {
    return type;
  }

  /**
   * Returns the {@link Comparator} used.
   *
   * @throws UnsupportedOperationException if org.testifyproject.testifyprojectparator is not defined
   */
  public Comparator org.testifyproject.testifyprojectparator() {
    if (org.testifyproject.testifyprojectparator != null) {
      return org.testifyproject.testifyprojectparator;
    }
    throw new UnsupportedOperationException("This ordering does not define a org.testifyproject.testifyprojectparator.");
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    if (obj == this) {
      return true;
    }
    if (!(obj instanceof ElementOrder)) {
      return false;
    }

    ElementOrder other = (ElementOrder) obj;
    return (type == other.type) && Objects.equal(org.testifyproject.testifyprojectparator, other.org.testifyproject.testifyprojectparator);
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(type, org.testifyproject.testifyprojectparator);
  }

  @Override
  public String toString() {
    ToStringHelper helper = MoreObjects.toStringHelper(this).add("type", type);
    if (org.testifyproject.testifyprojectparator != null) {
      helper.add("org.testifyproject.testifyprojectparator", org.testifyproject.testifyprojectparator);
    }
    return helper.toString();
  }

  /** Returns an empty mutable map whose keys will respect this {@link ElementOrder}. */
   Map createMap(int expectedSize) {
    switch (type) {
      case UNORDERED:
        return Maps.newHashMapWithExpectedSize(expectedSize);
      case INSERTION:
        return Maps.newLinkedHashMapWithExpectedSize(expectedSize);
      case SORTED:
        return Maps.newTreeMap(org.testifyproject.testifyprojectparator());
      default:
        throw new AssertionError();
    }
  }

  @SuppressWarnings("unchecked")
   ElementOrder cast() {
    return (ElementOrder) this;
  }
}