/*
 * Copyright (C) 2002-2017 Sebastiano Vigna
 *
 * 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 PACKAGE;

import java.util.Set;

/**  An abstract class providing basic methods for sets implementing a type-specific interface.
 *
 * <p>Note that the type-specific {@link Set} interface adds a type-specific {@code remove()}
 * method, as it is no longer harmful for subclasses. Thus, concrete subclasses of this class
 * must implement {@code remove()} (the {@code rem()} implementation of this
 * class just delegates to {@code remove()}).
 */

public abstract class ABSTRACT_SET KEY_GENERIC extends ABSTRACT_COLLECTION KEY_GENERIC implements Cloneable, SET KEY_GENERIC {

	protected ABSTRACT_SET() {}

	@Override
	public abstract KEY_ITERATOR KEY_GENERIC iterator();

	@Override
	public boolean equals(final Object o) {
		if (o == this) return true;
		if (!(o instanceof Set)) return false;

		Set<?> s = (Set<?>) o;
		if (s.size() != size()) return false;
		return containsAll(s);
	}


	/** Returns a hash code for this set.
	 *
	 * The hash code of a set is computed by summing the hash codes of
	 * its elements.
	 *
	 * @return a hash code for this set.
	 */
	@Override
	public int hashCode() {
		int h = 0, n = size();
		KEY_ITERATOR KEY_GENERIC i = iterator();
		KEY_GENERIC_TYPE k;

		while(n-- != 0) {
			k = i.NEXT_KEY(); // We need k because KEY2JAVAHASH() is a macro with repeated evaluation.
			h += KEY2JAVAHASH(k);
		}
		return h;
	}


#if KEYS_PRIMITIVE
	/** {@inheritDoc}
	 * Delegates to the type-specific {@code rem()} method
	 * implemented by type-specific abstract {@link java.util.Collection} superclass.
	 */
	@Override
	public boolean remove(KEY_TYPE k) {
		return super.rem(k);
	}

	/** {@inheritDoc}
	 * Delegates to the type-specific {@code remove()} method
	 * specified in the type-specific {@link Set} interface.
	 * @deprecated Please use {@code remove()} instead.
	 */
	@Deprecated
	@Override
	public boolean rem(KEY_TYPE k) {
		return remove(k);
	}
#endif

}
