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HSQLDB - Lightweight 100% Java SQL Database Engine
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/* Copyright (c) 2001-2019, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 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.
 *
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 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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package org.hsqldb.lib;

/**
 * Implementation of an ordered Set which maintains the inserted order of
 * elements and allows access by index. Iterators return the
 * elements in the index order.
 *
 * This class does not store null elements.
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.3.3
 * @since 1.9.0
 */
public class OrderedHashSet extends HashSet implements HsqlList, Set {

    public OrderedHashSet() {

        super(8);

        isList = true;
    }

    public boolean remove(Object key) {
        return super.removeObject(key, true) != null;
    }

    public Object remove(int index) throws IndexOutOfBoundsException {

        checkRange(index);

        return super.removeObject(objectKeyTable[index], true);
    }

    public boolean insert(int index,
                          Object key) throws IndexOutOfBoundsException {

        if (index < 0 || index > size()) {
            throw new IndexOutOfBoundsException();
        }

        if (contains(key)) {
            return false;
        }

        if (index == size()) {
            return add(key);
        }

        Object[] array = new Object[size()];

        toArray(array);
        super.clear();

        for (int i = 0; i < index; i++) {
            add(array[i]);
        }

        add(key);

        for (int i = index; i < array.length; i++) {
            add(array[i]);
        }

        return true;
    }

    public Object set(int index, Object key) throws IndexOutOfBoundsException {
        throw new IndexOutOfBoundsException();
    }

    public void add(int index, Object key) throws IndexOutOfBoundsException {
        throw new IndexOutOfBoundsException();
    }

    public Object get(int index) throws IndexOutOfBoundsException {

        checkRange(index);

        return objectKeyTable[index];
    }

    public void toArray(Object[] array) {
        System.arraycopy(super.objectKeyTable, 0, array, 0, array.length);
    }

    public void addAll(OrderedHashSet other) {

        for (int i = 0, size = other.size(); i < size; i++) {
            add(other.get(i));
        }
    }

    public int getIndex(Object key) {
        return getLookup(key, key.hashCode());
    }

    public int getLargestIndex(OrderedHashSet other) {

        int max = -1;

        for (int i = 0, size = other.size(); i < size; i++) {
            int index = getIndex(other.get(i));

            if (index > max) {
                max = index;
            }
        }

        return max;
    }

    public int getSmallestIndex(OrderedHashSet other) {

        int min = -1;

        for (int i = 0, size = other.size(); i < size; i++) {
            int index = getIndex(other.get(i));

            if (index != -1) {
                if (min == -1 || index < min) {
                    min = index;
                }
            }
        }

        return min;
    }

    public int getCommonElementCount(Set other) {

        int count = 0;

        for (int i = 0, size = size(); i < size; i++) {
            if (other.contains(objectKeyTable[i])) {
                count++;
            }
        }

        return count;
    }

    public static OrderedHashSet addAll(OrderedHashSet first,
                                        OrderedHashSet second) {

        if (second == null) {
            return first;
        }

        if (first == null) {
            first = new OrderedHashSet();
        }

        first.addAll(second);

        return first;
    }

    public static OrderedHashSet add(OrderedHashSet first, Object value) {

        if (value == null) {
            return first;
        }

        if (first == null) {
            first = new OrderedHashSet();
        }

        first.add(value);

        return first;
    }

    private void checkRange(int i) {

        if (i < 0 || i >= size()) {
            throw new IndexOutOfBoundsException();
        }
    }
}