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HSQLDB example source code file (HsqlHeap.java)

This example HSQLDB source code file (HsqlHeap.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

hsqlheap, hsqlheap, illegalargumentexception, illegalargumentexception, object, object, runtimeexception, runtimeexception

The HSQLDB HsqlHeap.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;

/**
 * Provides the base HSQLDB interface for Heap ADT implementations. <p>
 *
 * In this context, a Heap is simply a collection-like ADT that allows addition
 * of elements and provides a way to remove the least element, given some
 * implementation-dependent strategy for imposing an order over its
 * elements. <p>
 *
 * Typically, an HsqlHeap will be implemented as a tree-like structure that
 * recursively guarantees a <i>Heap Invariant, such that all nodes below
 * the root are greater than the root, given some comparison stragegy. <p>

 * This in turn provides the basis for an efficient implementation of ADTs such
 * PriorityQueue, since Heap operations using the typical implementation are,
 * in theory, guaranteed to be O(log n).
 *
 * @author boucherb@users
 * @version 1.7.2
 * @since 1.7.2
 */
public interface HsqlHeap {

    /**
     * Removes all of the elements from this Heap.
     */
    void clear();

    /**
     * Retrieves whether this Heap is empty.
     */
    boolean isEmpty();

    /**
     * Retrieves whether this Heap is full.
     */
    boolean isFull();

    /**
     * Adds the specified element to this Heap.
     *
     * @param o The element to add
     * @throws IllegalArgumentException if the implementation does
     *      not accept elements of the supplied type (optional)
     * throws RuntimeException if the implementation
     *      dictates that this Heap is not currently accepting additions
     *      or that this Heap is currently full (optional)
     */
    void add(Object o) throws IllegalArgumentException, RuntimeException;

    /**
     * Retrieves the least element from this Heap, without removing it.
     *
     * @return the least element from this Heap
     */
    Object peek();

    /**
     * Retrieves the least element from this Heap, removing it in the process.
     *
     * @return the least element from this Heap
     */
    Object remove();

    /**
     * Retrieves the number of elements currently in this Heap.
     *
     * @return the number of elements currently in this Heap
     */
    int size();
}

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