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The ANTLR 3 tool.
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/*
 * [The "BSD license"]
 *  Copyright (c) 2010 Terence Parr
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *  1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.antlr.misc;

import org.antlr.tool.Grammar;

import java.util.List;

/** A generic set of ints that has an efficient implementation, BitSet,
 *  which is a compressed bitset and is useful for ints that
 *  are small, for example less than 500 or so, and w/o many ranges.  For
 *  ranges with large values like unicode char sets, this is not very efficient.
 *  Consider using IntervalSet.  Not all methods in IntervalSet are implemented.
 *
 *  @see org.antlr.misc.BitSet
 *  @see org.antlr.misc.IntervalSet
 */
public interface IntSet {
    /** Add an element to the set */
    void add(int el);

    /** Add all elements from incoming set to this set.  Can limit
     *  to set of its own type.
     */
    void addAll(IntSet set);

    /** Return the intersection of this set with the argument, creating
     *  a new set.
     */
    IntSet and(IntSet a);

    IntSet complement(IntSet elements);

    IntSet or(IntSet a);

    IntSet subtract(IntSet a);

    /** Return the size of this set (not the underlying implementation's
     *  allocated memory size, for example).
     */
    int size();

    boolean isNil();

	@Override
    boolean equals(Object obj);

    int getSingleElement();

    boolean member(int el);

    /** remove this element from this set */
    void remove(int el);

    List toList();

	@Override
    String toString();

    String toString(Grammar g);
}