/* Copyright (c) 2001-2011, The HSQL Development Group
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*
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*
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*
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package org.hsqldb.index;
import java.io.IOException;
import org.hsqldb.RowAVL;
import org.hsqldb.RowAVLDisk;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.LongLookup;
import org.hsqldb.persist.PersistentStore;
import org.hsqldb.rowio.RowInputInterface;
import org.hsqldb.rowio.RowOutputInterface;
/**
* Subclass of NodeAVL for huge databases.
* @author Fred Toussi (fredt@users dot sourceforge dot net)
* @version 2.2.9
* @since 2.2.9
*/
public class NodeAVLDiskLarge extends NodeAVL {
final RowAVLDisk row;
//
private long iLeft = NO_POS;
private long iRight = NO_POS;
private long iParent = NO_POS;
private int iId; // id of Index object for this Node
public static final int SIZE_IN_BYTE = 4 * 4;
public NodeAVLDiskLarge(RowAVLDisk r, RowInputInterface in,
int id) throws IOException {
int ext;
row = r;
iId = id;
ext = in.readInt();
iBalance = (byte) ext;
iLeft = in.readInt() & 0xffffffffL;
iRight = in.readInt() & 0xffffffffL;
iParent = in.readInt() & 0xffffffffL;
if (ext > 0xff) {
iParent |= (((long) ext << 8) & 0xff00000000L);
iLeft |= (((long) ext << 16) & 0xff00000000L);
iRight |= (((long) ext << 24) & 0xff00000000L);
}
if (iLeft == 0) {
iLeft = NO_POS;
}
if (iRight == 0) {
iRight = NO_POS;
}
if (iParent == 0) {
iParent = NO_POS;
}
}
public NodeAVLDiskLarge(RowAVLDisk r, int id) {
row = r;
iId = id;
}
public void delete() {
iLeft = NO_POS;
iRight = NO_POS;
iParent = NO_POS;
nLeft = null;
nRight = null;
nParent = null;
iBalance = 0;
row.setNodesChanged();
}
public boolean isInMemory() {
return row.isInMemory();
}
public boolean isMemory() {
return false;
}
public long getPos() {
return row.getPos();
}
public RowAVL getRow(PersistentStore store) {
if (!row.isInMemory()) {
return (RowAVLDisk) store.get(this.row, false);
} else {
row.updateAccessCount(store.getAccessCount());
}
return row;
}
public Object[] getData(PersistentStore store) {
return row.getData();
}
private NodeAVLDiskLarge findNode(PersistentStore store, long pos) {
NodeAVLDiskLarge ret = null;
RowAVLDisk r = (RowAVLDisk) store.get(pos, false);
if (r != null) {
ret = (NodeAVLDiskLarge) r.getNode(iId);
}
return ret;
}
boolean isLeft(NodeAVL n) {
if (n == null) {
return iLeft == NO_POS;
}
return iLeft == n.getPos();
}
boolean isRight(NodeAVL n) {
if (n == null) {
return iRight == NO_POS;
}
return iRight == n.getPos();
}
NodeAVL getLeft(PersistentStore store) {
NodeAVLDiskLarge node = this;
RowAVLDisk row = this.row;
if (!row.isInMemory()) {
row = (RowAVLDisk) store.get(this.row, false);
node = (NodeAVLDiskLarge) row.getNode(iId);
}
if (node.iLeft == NO_POS) {
return null;
}
if (node.nLeft == null || !node.nLeft.isInMemory()) {
node.nLeft = findNode(store, node.iLeft);
node.nLeft.nParent = node;
}
return node.nLeft;
}
NodeAVL getRight(PersistentStore store) {
NodeAVLDiskLarge node = this;
RowAVLDisk row = this.row;
if (!row.isInMemory()) {
row = (RowAVLDisk) store.get(this.row, false);
node = (NodeAVLDiskLarge) row.getNode(iId);
}
if (node.iRight == NO_POS) {
return null;
}
if (node.nRight == null || !node.nRight.isInMemory()) {
node.nRight = findNode(store, node.iRight);
node.nRight.nParent = node;
}
return node.nRight;
}
NodeAVL getParent(PersistentStore store) {
NodeAVLDiskLarge node = this;
RowAVLDisk row = this.row;
if (!row.isInMemory()) {
row = (RowAVLDisk) store.get(this.row, false);
node = (NodeAVLDiskLarge) row.getNode(iId);
}
if (node.iParent == NO_POS) {
return null;
}
if (node.nParent == null || !node.nParent.isInMemory()) {
node.nParent = findNode(store, iParent);
}
return node.nParent;
}
public int getBalance(PersistentStore store) {
NodeAVLDiskLarge node = this;
RowAVLDisk row = this.row;
if (!row.isInMemory()) {
row = (RowAVLDisk) store.get(this.row, false);
node = (NodeAVLDiskLarge) row.getNode(iId);
}
return node.iBalance;
}
boolean isRoot(PersistentStore store) {
NodeAVLDiskLarge node = this;
RowAVLDisk row = this.row;
if (!row.isInMemory()) {
row = (RowAVLDisk) store.get(this.row, false);
node = (NodeAVLDiskLarge) row.getNode(iId);
}
return node.iParent == NO_POS;
}
boolean isFromLeft(PersistentStore store) {
NodeAVLDiskLarge node = this;
RowAVLDisk row = this.row;
if (!row.isInMemory()) {
row = (RowAVLDisk) store.get(this.row, false);
node = (NodeAVLDiskLarge) row.getNode(iId);
}
if (node.iParent == NO_POS) {
return true;
}
if (node.nParent == null || !node.nParent.isInMemory()) {
node.nParent = findNode(store, iParent);
}
return row.getPos() == ((NodeAVLDiskLarge) node.nParent).iLeft;
}
public NodeAVL child(PersistentStore store, boolean isleft) {
return isleft ? getLeft(store)
: getRight(store);
}
NodeAVL setParent(PersistentStore store, NodeAVL n) {
NodeAVLDiskLarge node = this;
RowAVLDisk row = this.row;
if (!row.keepInMemory(true)) {
row = (RowAVLDisk) store.get(this.row, true);
node = (NodeAVLDiskLarge) row.getNode(iId);
}
if (!row.isInMemory()) {
row.keepInMemory(false);
throw Error.runtimeError(ErrorCode.U_S0500, "NodeAVLDisk");
}
row.setNodesChanged();
node.iParent = n == null ? NO_POS
: n.getPos();
if (n != null && !n.isInMemory()) {
n = findNode(store, n.getPos());
}
node.nParent = (NodeAVLDiskLarge) n;
row.keepInMemory(false);
return node;
}
public NodeAVL setBalance(PersistentStore store, int b) {
NodeAVLDiskLarge node = this;
RowAVLDisk row = this.row;
if (!row.keepInMemory(true)) {
row = (RowAVLDisk) store.get(this.row, true);
node = (NodeAVLDiskLarge) row.getNode(iId);
}
if (!row.isInMemory()) {
throw Error.runtimeError(ErrorCode.U_S0500, "NodeAVLDisk");
}
row.setNodesChanged();
node.iBalance = b;
row.keepInMemory(false);
return node;
}
NodeAVL setLeft(PersistentStore store, NodeAVL n) {
NodeAVLDiskLarge node = this;
RowAVLDisk row = this.row;
if (!row.keepInMemory(true)) {
row = (RowAVLDisk) store.get(this.row, true);
node = (NodeAVLDiskLarge) row.getNode(iId);
}
if (!row.isInMemory()) {
throw Error.runtimeError(ErrorCode.U_S0500, "NodeAVLDisk");
}
row.setNodesChanged();
node.iLeft = n == null ? NO_POS
: n.getPos();
if (n != null && !n.isInMemory()) {
n = findNode(store, n.getPos());
}
node.nLeft = (NodeAVLDiskLarge) n;
row.keepInMemory(false);
return node;
}
NodeAVL setRight(PersistentStore store, NodeAVL n) {
NodeAVLDiskLarge node = this;
RowAVLDisk row = this.row;
if (!row.keepInMemory(true)) {
row = (RowAVLDisk) store.get(this.row, true);
node = (NodeAVLDiskLarge) row.getNode(iId);
}
if (!row.isInMemory()) {
throw Error.runtimeError(ErrorCode.U_S0500, "NodeAVLDisk");
}
row.setNodesChanged();
node.iRight = n == null ? NO_POS
: n.getPos();
if (n != null && !n.isInMemory()) {
n = findNode(store, n.getPos());
}
node.nRight = (NodeAVLDiskLarge) n;
row.keepInMemory(false);
return node;
}
public NodeAVL set(PersistentStore store, boolean isLeft, NodeAVL n) {
NodeAVL x;
if (isLeft) {
x = setLeft(store, n);
} else {
x = setRight(store, n);
}
if (n != null) {
n.setParent(store, this);
}
return x;
}
public void replace(PersistentStore store, Index index, NodeAVL n) {
NodeAVLDiskLarge node = this;
RowAVLDisk row = this.row;
if (!row.keepInMemory(true)) {
row = (RowAVLDisk) store.get(this.row, true);
node = (NodeAVLDiskLarge) row.getNode(iId);
}
if (node.iParent == NO_POS) {
if (n != null) {
n = n.setParent(store, null);
}
store.setAccessor(index, n);
} else {
boolean isFromLeft = node.isFromLeft(store);
node.getParent(store).set(store, isFromLeft, n);
}
row.keepInMemory(false);
}
boolean equals(NodeAVL n) {
if (n instanceof NodeAVLDiskLarge) {
return this == n || row.getPos() == ((NodeAVLDiskLarge) n).getPos();
}
return false;
}
public int getRealSize(RowOutputInterface out) {
return NodeAVLDiskLarge.SIZE_IN_BYTE;
}
public void setInMemory(boolean in) {
if (!in) {
if (nLeft != null) {
nLeft.nParent = null;
}
if (nRight != null) {
nRight.nParent = null;
}
if (nParent != null) {
if (row.getPos() == ((NodeAVLDiskLarge) nParent).iLeft) {
nParent.nLeft = null;
} else {
nParent.nRight = null;
}
}
nLeft = nRight = nParent = null;
}
}
public void write(RowOutputInterface out) {
write(out, null);
}
public void write(RowOutputInterface out, LongLookup lookup) {
long leftTemp = getTranslatePointer(iLeft, lookup);
long rightTemp = getTranslatePointer(iRight, lookup);
long parentTemp = getTranslatePointer(iParent, lookup);
int ext = 0;
ext |= (int) ((parentTemp & 0xff00000000L) >> 8);
ext |= (int) ((leftTemp & 0xff00000000L) >> 16);
ext |= (int) ((rightTemp & 0xff00000000L) >> 24);
if (ext == 0) {
ext = iBalance;
} else {
ext |= (iBalance & 0xff);
}
out.writeInt(ext);
out.writeInt((int) leftTemp);
out.writeInt((int) rightTemp);
out.writeInt((int) parentTemp);
}
private static long getTranslatePointer(long pointer, LongLookup lookup) {
long newPointer = 0;
if (pointer != NodeAVL.NO_POS) {
if (lookup == null) {
newPointer = pointer;
} else {
newPointer = lookup.lookup(pointer);
}
}
return newPointer;
}
public void restore() {}
public void destroy() {}
public void updateAccessCount(int count) {}
public int getAccessCount() {
return 0;
}
public void setStorageSize(int size) {}
public int getStorageSize() {
return 0;
}
public void setPos(long pos) {}
public boolean hasChanged() {
return false;
}
public boolean isKeepInMemory() {
return false;
}
public boolean keepInMemory(boolean keep) {
return false;
}
}