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/*
 * Copyright 2007 Google Inc.
 * 
 * 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 java.util;

import java.util.function.Predicate;
import java.util.function.Consumer;

/**
 * General-purpose interface for storing collections of objects. [Sun
 * docs]
 * 
 * @param  element type
 */
public interface Collection extends Iterable {

  boolean add(E o);

  boolean addAll(Collection c);

  void clear();

  boolean contains(Object o);

  boolean containsAll(Collection c);

  boolean equals(Object o);

  int hashCode();

  boolean isEmpty();

  Iterator iterator();

  boolean remove(Object o);

  boolean removeAll(Collection c);

  boolean retainAll(Collection c);

  int size();

  Object[] toArray();

   T[] toArray(T[] a);

  default boolean removeIf(Predicate predicate) {
    Objects.requireNonNull(predicate);
    boolean modified = false;
    final Iterator iter = iterator();
    while (iter.hasNext()) {
        if (predicate.test(iter.next())) {
            iter.remove();
            modified = true;
        }
    }
    return modified;
  }

//  TODO implement Spliterator and Stream
//  default Spliterator spliterator() {
//      return Spliterators.spliterator(this, 0);
//  }
//
//  default Stream stream() {
//      return StreamSupport.stream(spliterator(), false);
//  }
//
//  default Stream parallelStream() {
//      return StreamSupport.stream(spliterator(), true);
//  }
  
  default void forEach(Consumer c) {
    for (E e : this) {
      c.accept(e);
    }
  }

}