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JHotDraw8 Utility classes for Collections

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/*
 * @(#)IntRangeSet.java
 * Copyright © 2023 The authors and contributors of JHotDraw. MIT License.
 */
package org.jhotdraw8.collection.primitive;

import org.jhotdraw8.icollection.readonly.AbstractReadOnlySet;
import org.jspecify.annotations.Nullable;

import java.util.Iterator;
import java.util.Objects;
import java.util.stream.IntStream;

/**
 * Represents a set of integers in a given range.
 */
public class IntRangeSet extends AbstractReadOnlySet {
    private final int from;
    private final int to;

    /**
     * Creates a new instance.
     *
     * @param from from inclusive
     * @param to   exclusive
     */
    public IntRangeSet(int from, int to) {
        Objects.checkIndex(from, to);
        this.from = from;
        this.to = to;
    }

    @Override
    public Iterator iterator() {
        return IntStream.range(from, to).iterator();
    }

    @Override
    public int size() {
        return to - from;
    }

    @Override
    public boolean contains(@Nullable Object o) {
        if (o instanceof Integer) {
            int e = ((int) o);
            return from <= e && e < to;
        }
        return false;
    }
}