// Path: src/main/java/org/fest/util/Preconditions.java
// public static @NotNull <T> T checkNotNull(@Nullable T reference) {
//   if (reference == null) {
//     throw new NullPointerException();
//   }
//   return reference;
// }


import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import static java.util.Collections.emptyList;
import static org.fest.util.Preconditions.checkNotNull;
/*
 * Created on Aug 23, 2012
 * 
 * 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.
 * 
 * Copyright @2012-2013 the original author or authors.
 */
package org.fest.util;



/**
 * Utility methods related to {@code Iterable}s.
 *
 * @author Yvonne Wang
 * @author Alex Ruiz
 * @author Joel Costigliola
 */
// TODO(alexRuiz): Get rid of this class.
public final class Iterables {
  private Iterables() {
  }

  /**
   * Indicates whether the given {@link Iterable} is {@code null} or empty.
   *
   * @param iterable the given {@code Iterable} to check.
   * @return {@code true} if the given {@code Iterable} is {@code null} or empty, otherwise {@code false}.
   */
  public static boolean isNullOrEmpty(@Nullable Iterable<?> iterable) {
    if (iterable == null) {
      return true;
    }
    if (iterable instanceof Collection && ((Collection<?>) iterable).isEmpty()) {
      return true;
    }
    return !iterable.iterator().hasNext();
  }

  /**
   * Returns the size of the given {@link Iterable}.
   *
   * @param iterable the {@link Iterable} to get size.
   * @return the size of the given {@link Iterable}.
   * @throws NullPointerException if given {@link Iterable} is null.
   */
  public static int sizeOf(@NotNull Iterable<?> iterable) {
// Path: src/main/java/org/fest/util/Preconditions.java
// public static @NotNull <T> T checkNotNull(@Nullable T reference) {
//   if (reference == null) {
//     throw new NullPointerException();
//   }
//   return reference;
// }


// Path: src/main/java/org/fest/util/Iterables.java
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import static java.util.Collections.emptyList;
import static org.fest.util.Preconditions.checkNotNull;

/*
 * Created on Aug 23, 2012
 * 
 * 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.
 * 
 * Copyright @2012-2013 the original author or authors.
 */
package org.fest.util;



/**
 * Utility methods related to {@code Iterable}s.
 *
 * @author Yvonne Wang
 * @author Alex Ruiz
 * @author Joel Costigliola
 */
// TODO(alexRuiz): Get rid of this class.
public final class Iterables {
  private Iterables() {
  }

  /**
   * Indicates whether the given {@link Iterable} is {@code null} or empty.
   *
   * @param iterable the given {@code Iterable} to check.
   * @return {@code true} if the given {@code Iterable} is {@code null} or empty, otherwise {@code false}.
   */
  public static boolean isNullOrEmpty(@Nullable Iterable<?> iterable) {
    if (iterable == null) {
      return true;
    }
    if (iterable instanceof Collection && ((Collection<?>) iterable).isEmpty()) {
      return true;
    }
    return !iterable.iterator().hasNext();
  }

  /**
   * Returns the size of the given {@link Iterable}.
   *
   * @param iterable the {@link Iterable} to get size.
   * @return the size of the given {@link Iterable}.
   * @throws NullPointerException if given {@link Iterable} is null.
   */
  public static int sizeOf(@NotNull Iterable<?> iterable) {
    checkNotNull(iterable);