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dx is an Android SDK platform tool that transforms Java bytecode (and JARs) into Dalvik VM 'DEX' code.

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/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * 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 com.android.dx.util;

/**
 * A set of integers
 */
public interface IntSet {

    /**
     * Adds an int to a set
     *
     * @param value int to add
     */
    void add(int value);

    /**
     * Removes an int from a set.
     *
     * @param value int to remove
     */
    void remove(int value);

    /**
     * Checks to see if a value is in the set
     *
     * @param value int to check
     * @return true if in set
     */
    boolean has(int value);

    /**
     * Merges {@code other} into this set, so this set becomes the
     * union of the two.
     *
     * @param other {@code non-null;} other set to merge with.
     */
    void merge(IntSet other);

    /**
     * Returns the count of unique elements in this set.
     *
     * @return {@code > = 0;} count of unique elements
     */
    int elements();

    /**
     * Iterates the set
     *
     * @return {@code non-null;} a set iterator
     */
    IntIterator iterator();
}