HSQLDB example source code file (IntValueHashMap.java)

This example HSQLDB source code file (IntValueHashMap.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - HSQLDB tags/keywords

basehashiterator, basehashmap, illegalargumentexception, intvaluehashmap, intvaluehashmap, iterator, keyset, nosuchelementexception, nosuchelementexception, object, runtimeexception, runtimeexception, set, set, util

The HSQLDB IntValueHashMap.java source code

/* Copyright (c) 2001-2008, 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.
 *
 * 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
 * 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,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


package org.hsqldb.lib;

import java.util.NoSuchElementException;

import org.hsqldb.store.BaseHashMap;

/**
 * This class does not store null keys.
 *
 * @author fredt@users
 * @version 1.7.2
 * @since 1.7.2
 */
public class IntValueHashMap extends BaseHashMap {

    Set keySet;

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

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

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

    public int get(Object key) throws NoSuchElementException {

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

        int hash   = key.hashCode();
        int lookup = getLookup(key, hash);

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

        throw new NoSuchElementException();
    }

    public int get(Object key, int defaultValue) {

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

        int hash   = key.hashCode();
        int lookup = getLookup(key, hash);

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

        return defaultValue;
    }

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

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

        int hash   = key.hashCode();
        int lookup = getLookup(key, hash);

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

            return true;
        }

        return false;
    }

    public boolean put(Object key, int value) {

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

        int oldSize = size();

        super.addOrRemove(0, value, key, null, false);

        return oldSize != size();
    }

    public boolean remove(Object key) {

        int oldSize = size();

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

        return oldSize != size();
    }

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

    public boolean containsValue(int value) {
        throw new RuntimeException();
    }

    public Set keySet() {

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

        return keySet;
    }

    class KeySet implements Set {

        public Iterator iterator() {
            return IntValueHashMap.this.new BaseHashIterator(true);
        }

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

        public boolean contains(Object o) {
            return containsKey(o);
        }

        public Object get(Object key) {

            int lookup = IntValueHashMap.this.getLookup(key, key.hashCode());

            if (lookup < 0) {
                return null;
            } else {
                return IntValueHashMap.this.objectKeyTable[lookup];
            }
        }

        public boolean add(Object value) {
            throw new RuntimeException();
        }

        public boolean addAll(Collection c) {
            throw new RuntimeException();
        }

        public boolean remove(Object o) {

            int oldSize = size();

            IntValueHashMap.this.remove(o);

            return size() != oldSize;
        }

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

        public void clear() {
            IntValueHashMap.this.clear();
        }
    }

    public void putAll(IntValueHashMap t) {

        Iterator it = t.keySet().iterator();

        while (it.hasNext()) {
            Object key = it.next();

            put(key, t.get(key));
        }
    }
}