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HSQLDB example source code file (HashMappedList.java)

This example HSQLDB source code file (HashMappedList.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

hashmap, hashmappedlist, hashmappedlist, illegalargumentexception, illegalargumentexception, indexoutofboundsexception, indexoutofboundsexception, object, object

The HSQLDB HashMappedList.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;

/**
 * Implementation of an Map which maintains the user-defined order of the keys.
 * Key/value pairs can be accessed by index or by key. Iterators return the
 * keys or values in the index order.
 *
 * This class does not store null keys.
 *
 * @author fredt@users
 * @version 1.7.2
 * @since 1.7.2
 */
public class HashMappedList extends HashMap {

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

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

    public HashMappedList(int initialCapacity,
                          float loadFactor) throws IllegalArgumentException {
        super(initialCapacity, loadFactor);
    }

    public Object get(int index) throws IndexOutOfBoundsException {

        checkRange(index);

        return objectValueTable[index];
    }

    public Object remove(Object key) {

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

        if (lookup < 0) {
            return null;
        }

        Object returnValue = super.remove(key);

        removeRow(lookup);

        return returnValue;
    }

    public Object remove(int index) throws IndexOutOfBoundsException {

        checkRange(index);

        return remove(objectKeyTable[index]);
    }

    public boolean add(Object key, Object value) {

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

        super.put(key, value);

        return true;
    }

    public Object put(Object key, Object value) {
        return super.put(key, value);
    }

    public Object set(int index,
                      Object value) throws IndexOutOfBoundsException {

        checkRange(index);

        Object returnValue = objectKeyTable[index];

        objectKeyTable[index] = value;

        return returnValue;
    }

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

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

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

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

        HashMappedList hm = new HashMappedList(size());

        for (int i = index; i < size(); i++) {
            hm.add(getKey(i), get(i));
        }

        for (int i = size() - 1; i >= index; i--) {
            remove(i);
        }

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

        return true;
    }

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

        checkRange(index);

        if (keySet().contains(key) && getIndex(key) != index) {
            return false;
        }

        super.remove(objectKeyTable[index]);
        super.put(key, value);

        return true;
    }

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

        checkRange(index);

        Object value = objectValueTable[index];

        return set(index, key, value);
    }

    public Object getKey(int index) throws IndexOutOfBoundsException {

        checkRange(index);

        return objectKeyTable[index];
    }

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

    private void checkRange(int i) {

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

Other HSQLDB examples (source code examples)

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