Source Code Cross Referenced for HsqlHeap.java in  » Database-DBMS » hsql » org » hsqldb » lib » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » hsql » org.hsqldb.lib 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (c) 2001-2005, The HSQL Development Group
002:         * All rights reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, are permitted provided that the following conditions are met:
006:         *
007:         * Redistributions of source code must retain the above copyright notice, this
008:         * list of conditions and the following disclaimer.
009:         *
010:         * Redistributions in binary form must reproduce the above copyright notice,
011:         * this list of conditions and the following disclaimer in the documentation
012:         * and/or other materials provided with the distribution.
013:         *
014:         * Neither the name of the HSQL Development Group nor the names of its
015:         * contributors may be used to endorse or promote products derived from this
016:         * software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
022:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
026:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029:         */
030:
031:        package org.hsqldb.lib;
032:
033:        /**
034:         * Provides the base HSQLDB interface for Heap ADT implementations. <p>
035:         *
036:         * In this context, a Heap is simply a collection-like ADT that allows addition
037:         * of elements and provides a way to remove the least element, given some
038:         * implementation-dependent strategy for imposing an order over its
039:         * elements. <p>
040:         *
041:         * Typically, an HsqlHeap will be implemented as a tree-like structure that
042:         * recursively guarantees a <i>Heap Invariant</i>, such that all nodes below
043:         * the root are greater than the root, given some comparison stragegy. <p>
044:
045:         * This in turn provides the basis for an efficient implementation of ADTs such
046:         * PriorityQueue, since Heap operations using the typical implementation are,
047:         * in theory, guaranteed to be O(log n).
048:         *
049:         * @author boucherb@users
050:         * @version 1.7.2
051:         * @since 1.7.2
052:         */
053:        public interface HsqlHeap {
054:
055:            /**
056:             * Removes all of the elements from this Heap.
057:             */
058:            void clear();
059:
060:            /**
061:             * Retrieves whether this Heap is empty.
062:             */
063:            boolean isEmpty();
064:
065:            /**
066:             * Retrieves whether this Heap is full.
067:             */
068:            boolean isFull();
069:
070:            /**
071:             * Adds the specified element to this Heap.
072:             *
073:             * @param o The element to add
074:             * @throws IllegalArgumentException if the implementation does
075:             *      not accept elements of the supplied type (optional)
076:             * throws RuntimeException if the implementation
077:             *      dictates that this Heap is not currently accepting additions
078:             *      or that this Heap is currently full (optional)
079:             */
080:            void add(Object o) throws IllegalArgumentException,
081:                    RuntimeException;
082:
083:            /**
084:             * Retrieves the least element from this Heap, without removing it.
085:             *
086:             * @return the least element from this Heap
087:             */
088:            Object peek();
089:
090:            /**
091:             * Retrieves the least element from this Heap, removing it in the process.
092:             *
093:             * @return the least element from this Heap
094:             */
095:            Object remove();
096:
097:            /**
098:             * Retrieves the number of elements currently in this Heap.
099:             *
100:             * @return the number of elements currently in this Heap
101:             */
102:            int size();
103:        }
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