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

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


001:        /* Copyright (c) 1995-2000, The Hypersonic SQL 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 Hypersonic SQL 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 THE HYPERSONIC SQL GROUP,
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:         * This software consists of voluntary contributions made by many individuals 
031:         * on behalf of the Hypersonic SQL Group.
032:         *
033:         *
034:         * For work added by the HSQL Development Group:
035:         *
036:         * Copyright (c) 2001-2005, The HSQL Development Group
037:         * All rights reserved.
038:         *
039:         * Redistribution and use in source and binary forms, with or without
040:         * modification, are permitted provided that the following conditions are met:
041:         *
042:         * Redistributions of source code must retain the above copyright notice, this
043:         * list of conditions and the following disclaimer.
044:         *
045:         * Redistributions in binary form must reproduce the above copyright notice,
046:         * this list of conditions and the following disclaimer in the documentation
047:         * and/or other materials provided with the distribution.
048:         *
049:         * Neither the name of the HSQL Development Group nor the names of its
050:         * contributors may be used to endorse or promote products derived from this
051:         * software without specific prior written permission.
052:         *
053:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
054:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
055:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
056:         * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
057:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
058:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
059:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
060:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
061:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
062:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
063:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
064:         */
065:
066:        package org.hsqldb;
067:
068:        import java.io.IOException;
069:
070:        import org.hsqldb.rowio.RowOutputInterface;
071:
072:        /**
073:         *  Common MEMORY and TEXT table node implementation. Nodes are always in
074:         *  memory so an Object reference is used to access the other Nodes in the
075:         *  AVL tree.
076:         *
077:         *  New class derived from the Hypersonic code
078:         *
079:         * @author Thomas Mueller (Hypersonic SQL Group)
080:         * @version    1.7.2
081:         * @since Hypersonic SQL
082:         */
083:        abstract class BaseMemoryNode extends Node {
084:
085:            protected Node nLeft;
086:            protected Node nRight;
087:            protected Node nParent;
088:
089:            void delete() {
090:                iBalance = -2;
091:                nLeft = nRight = nParent = null;
092:            }
093:
094:            Node getLeft() throws HsqlException {
095:
096:                if (Trace.DOASSERT) {
097:                    Trace.doAssert(iBalance != -2);
098:                }
099:
100:                return nLeft;
101:            }
102:
103:            void setLeft(Node n) throws HsqlException {
104:
105:                if (Trace.DOASSERT) {
106:                    Trace.doAssert(iBalance != -2);
107:                }
108:
109:                nLeft = n;
110:            }
111:
112:            boolean isLeft(Node node) throws HsqlException {
113:                return nLeft == node;
114:            }
115:
116:            boolean isRight(Node node) throws HsqlException {
117:                return nRight == node;
118:            }
119:
120:            Node getRight() throws HsqlException {
121:
122:                if (Trace.DOASSERT) {
123:                    Trace.doAssert(iBalance != -2);
124:                }
125:
126:                return nRight;
127:            }
128:
129:            void setRight(Node n) throws HsqlException {
130:
131:                if (Trace.DOASSERT) {
132:                    Trace.doAssert(iBalance != -2);
133:                }
134:
135:                nRight = n;
136:            }
137:
138:            Node getParent() throws HsqlException {
139:
140:                if (Trace.DOASSERT) {
141:                    Trace.doAssert(iBalance != -2);
142:                }
143:
144:                return nParent;
145:            }
146:
147:            boolean isRoot() {
148:                return nParent == null;
149:            }
150:
151:            void setParent(Node n) throws HsqlException {
152:
153:                if (Trace.DOASSERT) {
154:                    Trace.doAssert(iBalance != -2);
155:                }
156:
157:                nParent = n;
158:            }
159:
160:            void setBalance(int b) throws HsqlException {
161:
162:                if (Trace.DOASSERT) {
163:                    Trace.doAssert(iBalance != -2);
164:                }
165:
166:                iBalance = b;
167:            }
168:
169:            boolean isFromLeft() throws HsqlException {
170:
171:                if (this .isRoot()) {
172:                    return true;
173:                }
174:
175:                Node parent = getParent();
176:
177:                if (Trace.DOASSERT) {
178:                    Trace.doAssert(parent != null);
179:                }
180:
181:                return equals(parent.getLeft());
182:            }
183:
184:            boolean equals(Node n) {
185:                return n == this ;
186:            }
187:
188:            void write(RowOutputInterface out) throws IOException {
189:            }
190:        }
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