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    • spoon.support.util.EmptyClearableSet Maven / Gradle / Ivy

    /*
 * SPDX-License-Identifier: (MIT OR CECILL-C)
 *
 * Copyright (C) 2006-2019 INRIA and contributors
 *
 * Spoon is available either under the terms of the MIT License (see LICENSE-MIT.txt) of the Cecill-C License (see LICENSE-CECILL-C.txt). You as the user are entitled to choose the terms under which to adopt Spoon.
 */
package spoon.support.util;

import java.io.Serializable;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;

public final class EmptyClearableSet extends AbstractSet implements Serializable {
	private static final long serialVersionUID = 0L;

	private static final EmptyClearableSet EMPTY_SET = new EmptyClearableSet<>();

	public static  Set instance() {
		return (Set) EMPTY_SET;
	}

	private EmptyClearableSet() {
	}

	@Override
	public void clear() {
		// do nothing
	}

	@Override
	public Iterator iterator() {
		return EmptyIterator.instance();
	}

	@Override
	public int size() {
		return 0;
	}

	@Override
	public boolean isEmpty() {
		return true;
	}

	@Override
	public boolean contains(Object obj) {
		return false;
	}

	@Override
	public boolean containsAll(Collection c) {
		return c.isEmpty();
	}

	@Override
	public Object[] toArray() {
		return new Object[0];
	}

	@Override
	public  T[] toArray(T[] a) {
		if (a.length > 0) {
			a[0] = null;
		}
		return a;
	}

	// Preserves singleton property
	private Object readResolve() {
		return EMPTY_SET;
	}
}
    
    
    
    

    




    
    
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