intkeylongvaluehashmap.java

hsql是很有名的嵌入式数据库

/* Copyright (c) 2001-2005, The HSQL Development Group
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 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
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 *
 * 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
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package org.hsqldb.lib;

import java.util.NoSuchElementException;

import org.hsqldb.store.BaseHashMap;

/**
 * @author fredt@users
 * @version 1.7.2
 * @since 1.7.2
 */
public class IntKeyLongValueHashMap extends BaseHashMap {

    public IntKeyLongValueHashMap() {
        this(16, 0.75f);
    }

    public IntKeyLongValueHashMap(int initialCapacity)
    throws IllegalArgumentException {
        this(initialCapacity, 0.75f);
    }

    public IntKeyLongValueHashMap(int initialCapacity,
                                  float loadFactor)
                                  throws IllegalArgumentException {
        super(initialCapacity, loadFactor, BaseHashMap.intKeyOrValue,
              BaseHashMap.longKeyOrValue, false);
    }

    public long get(int key) throws NoSuchElementException {

        int lookup = getLookup(key);

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

        throw new NoSuchElementException();
    }

    public long get(int key, int defaultValue) {

        int lookup = getLookup(key);

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

        return defaultValue;
    }

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

        int lookup = getLookup(key);

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

            return true;
        }

        return false;
    }

    public boolean put(int key, int value) {

        int oldSize = size();

        super.addOrRemove(key, value, null, null, false);

        return oldSize != size();
    }

    public boolean remove(int key) {

        int oldSize = size();

        super.addOrRemove(key, 0, null, null, true);

        return oldSize != size();
    }
}