/* Copyright (c) 2001-2024, The HSQL Development Group
 * All rights reserved.
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 * 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.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * 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
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 */


package org.hsqldb.lib;

import java.util.NoSuchElementException;

import org.hsqldb.map.BaseHashMap;

/**
 * A Map of int primitive keys to int primitive values.
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.7.3
 * @since 1.7.2
 */
public class IntKeyIntValueHashMap extends BaseHashMap
        implements Map<Integer, Integer> {

    private Set<Integer>                 keySet;
    private Collection<Integer>          values;
    private Set<Entry<Integer, Integer>> entries;

    public IntKeyIntValueHashMap() {
        this(8);
    }

    public IntKeyIntValueHashMap(
            int initialCapacity)
            throws IllegalArgumentException {

        super(
            initialCapacity,
            BaseHashMap.intKeyOrValue,
            BaseHashMap.intKeyOrValue,
            false);
    }

    public boolean containsKey(Object key) {

        if (key instanceof Integer) {
            int intKey = ((Integer) key).intValue();

            return super.containsIntKey(intKey);
        }

        if (key == null) {
            throw new NullPointerException();
        }

        return false;
    }

    public boolean containsKey(int key) {
        return super.containsIntKey(key);
    }

    public boolean containsValue(Object value) {

        if (value instanceof Integer) {
            int intValue = ((Integer) value).intValue();

            return super.containsValue(intValue);
        }

        if (value == null) {
            throw new NullPointerException();
        }

        return false;
    }

    public boolean containsValue(int value) {
        return super.containsValue(value);
    }

    public Integer get(Integer key) {

        if (key == null) {
            throw new NullPointerException();
        }

        int intKey = key.intValue();
        int lookup = getLookup(intKey);

        if (lookup != -1) {
            int intValue = intValueTable[lookup];

            return Integer.valueOf(intValue);
        }

        return null;
    }

    public int get(int key) throws NoSuchElementException {

        int lookup = getLookup(key);

        if (lookup != -1) {
            return intValueTable[lookup];
        }

        throw new NoSuchElementException();
    }

    public int get(int key, int defaultValue) {

        int lookup = getLookup(key);

        if (lookup != -1) {
            return intValueTable[lookup];
        }

        return defaultValue;
    }

    public boolean get(int key, int[] value) {

        int lookup = getLookup(key);

        if (lookup != -1) {
            value[0] = intValueTable[lookup];

            return true;
        }

        return false;
    }

    public Integer put(Integer key, Integer value) {

        if (key == null || value == null) {
            throw new NullPointerException();
        }

        int oldSize = size();

        super.addOrUpdate(key, value, null, null);

        if (oldSize == size()) {
            return null;
        } else {
            return value;
        }
    }

    public boolean put(int key, int value) {

        int oldSize = size();

        super.addOrUpdate(key, value, null, null);

        return oldSize != size();
    }

    public Integer remove(Object key) {

        if (key instanceof Integer) {
            int intKey = ((Integer) key).intValue();

            return (Integer) super.remove(intKey, 0, null, null, false, false);
        }

        if (key == null) {
            throw new NullPointerException();
        }

        return null;
    }

    public boolean remove(int key) {

        Integer value = (Integer) super.remove(
            key,
            0,
            null,
            null,
            false,
            false);

        return value != null;
    }

    public void putAll(IntKeyIntValueHashMap other) {

        Iterator<Integer> it = other.keySet().iterator();

        while (it.hasNext()) {
            int key   = it.nextInt();
            int value = other.get(key);

            put(key, value);
        }
    }

    public int[] keysToArray(int[] array) {
        return toIntArray(array, true);
    }

    public int[] valuesToArray(int[] array) {
        return toIntArray(array, false);
    }

    public Set<Integer> keySet() {

        if (keySet == null) {
            keySet = new KeySet();
        }

        return keySet;
    }

    public Collection<Integer> values() {

        if (values == null) {
            values = new Values();
        }

        return values;
    }

    public Set<Map.Entry<Integer, Integer>> entrySet() {

        if (entries == null) {
            entries = new EntrySet();
        }

        return entries;
    }

    private class EntrySet
            extends AbstractReadOnlyCollection<Map.Entry<Integer, Integer>>
            implements Set<Map.Entry<Integer, Integer>> {

        public Iterator<Entry<Integer, Integer>> iterator() {
            return IntKeyIntValueHashMap.this.new EntrySetIterator();
        }

        public int size() {
            return IntKeyIntValueHashMap.this.size();
        }

        public boolean isEmpty() {
            return size() == 0;
        }
    }

    private class EntrySetIterator extends BaseHashIterator {

        EntrySetIterator() {
            super(true);
        }

        public Entry<Integer, Integer> next() {

            Integer key   = super.nextInt();
            Integer value = intValueTable[lookup];

            return new MapEntry<>(key, value);
        }
    }

    private class KeySet extends AbstractReadOnlyCollection<Integer>
            implements Set<Integer> {

        public PrimitiveIterator<Integer> iterator() {
            return IntKeyIntValueHashMap.this.new BaseHashIterator(true);
        }

        public int size() {
            return IntKeyIntValueHashMap.this.size();
        }

        public boolean isEmpty() {
            return size() == 0;
        }
    }

    private class Values extends AbstractReadOnlyCollection<Integer> {

        public PrimitiveIterator<Integer> iterator() {
            return IntKeyIntValueHashMap.this.new BaseHashIterator(false);
        }

        public int size() {
            return IntKeyIntValueHashMap.this.size();
        }

        public boolean isEmpty() {
            return size() == 0;
        }
    }
}
