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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 static javaemul.internal.InternalPreconditions.checkNotNull;

/**
 * Skeletal implementation of the Set interface. [Sun
 * docs]
 * 
 * @param  the element type.
 */
public abstract class AbstractSet extends AbstractCollection implements
    Set {

  protected AbstractSet() { }

  @Override
  public boolean equals(Object o) {
    if (o == this) {
      return true;
    }

    if (!(o instanceof Set)) {
      return false;
    }

    Set other = (Set) o;
    if (other.size() != size()) {
      return false;
    }
    return containsAll(other);
  }

  @Override
  public int hashCode() {
    return Collections.hashCode(this);
  }

  @Override
  public boolean removeAll(Collection c) {
    checkNotNull(c);

    int size = size();
    if (size < c.size()) {
      // If the member of 'this' is in 'c', remove it from 'this'.
      //
      for (Iterator iter = iterator(); iter.hasNext();) {
        E o = iter.next();
        if (c.contains(o)) {
          iter.remove();
        }
      }
    } else {
      // Remove every member of 'c' from 'this'.
      //
      for (Object o : c) {
        remove(o);
      }
    }
    return (size != size());
  }

}