/* Copyright (c) 1995-2000, The Hypersonic SQL 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 Hypersonic SQL 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 THE HYPERSONIC SQL GROUP,
* 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.
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Hypersonic SQL Group.
*
*
* For work added by the HSQL Development Group:
*
* 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;
import java.io.IOException;
import org.hsqldb.rowio.RowOutputInterface;
/**
* Common MEMORY and TEXT table node implementation. Nodes are always in
* memory so an Object reference is used to access the other Nodes in the
* AVL tree.
*
* New class derived from the Hypersonic code
*
* @author Thomas Mueller (Hypersonic SQL Group)
* @version 1.7.2
* @since Hypersonic SQL
*/
abstract class BaseMemoryNode extends Node {
protected Node nLeft;
protected Node nRight;
protected Node nParent;
void delete() {
iBalance = -2;
nLeft = nRight = nParent = null;
}
Node getLeft() throws HsqlException {
if (Trace.DOASSERT) {
Trace.doAssert(iBalance != -2);
}
return nLeft;
}
void setLeft(Node n) throws HsqlException {
if (Trace.DOASSERT) {
Trace.doAssert(iBalance != -2);
}
nLeft = n;
}
boolean isLeft(Node node) throws HsqlException {
return nLeft == node;
}
boolean isRight(Node node) throws HsqlException {
return nRight == node;
}
Node getRight() throws HsqlException {
if (Trace.DOASSERT) {
Trace.doAssert(iBalance != -2);
}
return nRight;
}
void setRight(Node n) throws HsqlException {
if (Trace.DOASSERT) {
Trace.doAssert(iBalance != -2);
}
nRight = n;
}
Node getParent() throws HsqlException {
if (Trace.DOASSERT) {
Trace.doAssert(iBalance != -2);
}
return nParent;
}
boolean isRoot() {
return nParent == null;
}
void setParent(Node n) throws HsqlException {
if (Trace.DOASSERT) {
Trace.doAssert(iBalance != -2);
}
nParent = n;
}
void setBalance(int b) throws HsqlException {
if (Trace.DOASSERT) {
Trace.doAssert(iBalance != -2);
}
iBalance = b;
}
boolean isFromLeft() throws HsqlException {
if (this.isRoot()) {
return true;
}
Node parent = getParent();
if (Trace.DOASSERT) {
Trace.doAssert(parent != null);
}
return equals(parent.getLeft());
}
boolean equals(Node n) {
return n == this;
}
void write(RowOutputInterface out) throws IOException {}
}