/* 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) 2001-2009, 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_voltpatches.index;
import java.io.IOException;
import org.hsqldb_voltpatches.rowio.RowOutputInterface;
import org.hsqldb_voltpatches.persist.*;
/**
* 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 Hypersonic SQL code and enhanced in HSQLDB. <p>
*
* @author Thomas Mueller (Hypersonic SQL Group)
* @version 1.9.0
* @since Hypersonic SQL
*/
abstract class NodeAVLBaseMemory extends NodeAVL {
protected NodeAVL nLeft;
protected NodeAVL nRight;
protected NodeAVL nParent;
public void delete() {
iBalance = -2;
nLeft = nRight = nParent = null;
}
NodeAVL getLeft(PersistentStore store) {
return nLeft;
}
NodeAVL setLeft(PersistentStore persistentStore, NodeAVL n) {
nLeft = n;
return this;
}
public int getBalance() {
return iBalance;
}
boolean isLeft(NodeAVL node) {
return nLeft == node;
}
boolean isRight(NodeAVL node) {
return nRight == node;
}
NodeAVL getRight(PersistentStore persistentStore) {
return nRight;
}
NodeAVL setRight(PersistentStore persistentStore, NodeAVL n) {
nRight = n;
return this;
}
NodeAVL getParent(PersistentStore store) {
return nParent;
}
boolean isRoot() {
return nParent == null;
}
NodeAVL setParent(PersistentStore persistentStore, NodeAVL n) {
nParent = n;
return this;
}
public NodeAVL setBalance(PersistentStore store, int b) {
iBalance = b;
return this;
}
boolean isFromLeft(PersistentStore store) {
if (this.isRoot()) {
return true;
}
NodeAVL parent = getParent(store);
return equals(parent.getLeft(store));
}
boolean equals(NodeAVL n) {
return n == this;
}
public void setInMemory(boolean in) {}
public void write(RowOutputInterface out) {}
}