/*
	* Copyright (C) 2002-2019 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 it.unimi.dsi.fastutil.objects;
import java.util.AbstractCollection;
An abstract class providing basic methods for collections implementing a
type-specific interface.
 In particular, this class provide iterator(), add(), AbstractCollection.remove(Object) and AbstractCollection.contains(Object) methods that just call the type-specific counterpart. 

Warning: Because of a name clash between the list and collection interfaces the type-specific deletion method of a type-specific abstract collection is rem(), rather then remove(). A subclass must thus override rem(), rather than remove(), to make all inherited methods work properly. /**
 * An abstract class providing basic methods for collections implementing a
 * type-specific interface.
 *
 * <p>
 * In particular, this class provide {@link #iterator()}, {@code add()},
 * {@link #remove(Object)} and {@link #contains(Object)} methods that just call
 * the type-specific counterpart.
 *
 * <p>
 * <strong>Warning</strong>: Because of a name clash between the list and
 * collection interfaces the type-specific deletion method of a type-specific
 * abstract collection is {@code rem()}, rather then {@code remove()}. A
 * subclass must thus override {@code rem()}, rather than {@code remove()}, to
 * make all inherited methods work properly.
 */
public abstract class AbstractReferenceCollection<K> extends AbstractCollection<K> implements ReferenceCollection<K> {
	protected AbstractReferenceCollection() {
	}
	@Override
	public abstract ObjectIterator<K> iterator();
	@Override
	public String toString() {
		final StringBuilder s = new StringBuilder();
		final ObjectIterator<K> i = iterator();
		int n = size();
		Object k;
		boolean first = true;
		s.append("{");
		while (n-- != 0) {
			if (first)
				first = false;
			else
				s.append(", ");
			k = i.next();
			if (this == k)
				s.append("(this collection)");
			else
				s.append(String.valueOf(k));
		}
		s.append("}");
		return s.toString();
	}
}