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package org.hsqldb.persist;
import org.hsqldb.ColumnSchema;
import org.hsqldb.HsqlException;
import org.hsqldb.Row;
import org.hsqldb.RowAVL;
import org.hsqldb.Session;
import org.hsqldb.Table;
import org.hsqldb.TableBase;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.index.Index;
import org.hsqldb.index.IndexAVL;
import org.hsqldb.index.NodeAVL;
import org.hsqldb.lib.ArrayUtil;
import org.hsqldb.navigator.RowIterator;
import org.hsqldb.rowio.RowInputInterface;
import org.hsqldb.types.Type;
public abstract class RowStoreAVL implements PersistentStore {
PersistentStoreCollection manager;
Index[] indexList = Index.emptyArray;
CachedObject[] accessorList = CachedObject.emptyArray;
TableBase table;
int elementCount;
// for result tables
// for INFORMATION SCHEMA tables
long timestamp;
public TableBase getTable() {
return table;
}
public long getTimestamp() {
return timestamp;
}
public void setTimestamp(long timestamp) {
this.timestamp = timestamp;
}
public boolean isMemory() {
return false;
}
public abstract int getAccessCount();
public abstract void set(CachedObject object);
public abstract CachedObject get(int key, boolean keep);
public abstract CachedObject get(CachedObject object, boolean keep);
public abstract int getStorageSize(int key);
public abstract void add(CachedObject object);
public abstract CachedObject get(RowInputInterface in);
public abstract CachedObject getNewInstance(int size);
public abstract CachedObject getNewCachedObject(Session session,
Object object);
public abstract void removePersistence(int i);
public abstract void removeAll();
public abstract void remove(int i);
public abstract void release(int i);
public abstract void commitPersistence(CachedObject object);
public abstract DataFileCache getCache();
public abstract void setCache(DataFileCache cache);
public abstract void release();
public PersistentStore getAccessorStore(Index index) {
return null;
}
public CachedObject getAccessor(Index key) {
int position = key.getPosition();
if (position >= accessorList.length) {
throw Error.runtimeError(ErrorCode.U_S0500, "RowStoreAVL");
}
return accessorList[position];
}
/**
* Basic delete with no logging or referential checks.
*/
public void delete(Session session, Row row) {
row = (Row) get(row, false);
for (int i = indexList.length - 1; i >= 0; i--) {
indexList[i].delete(session, this, row);
}
row.delete(this);
}
public void indexRow(Session session, Row row) {
int i = 0;
try {
for (; i < indexList.length; i++) {
indexList[i].insert(session, this, row);
}
} catch (HsqlException e) {
// unique index violation - rollback insert
for (--i; i >= 0; i--) {
indexList[i].delete(session, this, row);
}
remove(row.getPos());
throw e;
}
}
//
public final void indexRows() {
RowIterator it = rowIterator();
for (int i = 1; i < indexList.length; i++) {
setAccessor(indexList[i], null);
}
while (it.hasNext()) {
Row row = it.getNextRow();
((RowAVL) row).clearNonPrimaryNodes();
for (int i = 1; i < indexList.length; i++) {
indexList[i].insert(null, this, row);
}
}
}
public final RowIterator rowIterator() {
if (indexList.length == 0 || indexList[0] == null) {
throw Error.runtimeError(ErrorCode.U_S0500, "RowStoreAVL");
}
return indexList[0].firstRow(this);
}
public abstract void setAccessor(Index key, CachedObject accessor);
public abstract void setAccessor(Index key, int accessor);
public void resetAccessorKeys(Index[] keys) {
if (indexList.length == 0 || indexList[0] == null
|| accessorList[0] == null) {
indexList = keys;
accessorList = new CachedObject[indexList.length];
return;
}
CachedObject[] oldAccessors = accessorList;
Index[] oldIndexList = indexList;
int limit = indexList.length;
int diff = 1;
int position = 0;
if (keys.length < indexList.length) {
diff = -1;
limit = keys.length;
}
for (; position < limit; position++) {
if (indexList[position] != keys[position]) {
break;
}
}
accessorList = (CachedObject[]) ArrayUtil.toAdjustedArray(accessorList,
null, position, diff);
indexList = keys;
try {
if (diff > 0) {
insertIndexNodes(indexList[0], indexList[position]);
} else {
dropIndexFromRows(indexList[0], oldIndexList[position]);
}
} catch (HsqlException e) {
accessorList = oldAccessors;
indexList = oldIndexList;
throw e;
}
}
public int elementCount(Session session) {
if (elementCount < 0) {
Index index = this.indexList[0];
if (index == null) {
elementCount = 0;
} else {
elementCount = ((IndexAVL) index).getNodeCount(session, this);
}
}
return elementCount;
}
public int elementCountUnique(Index index) {
return 0;
}
public void setElementCount(Index key, int size, int uniqueSize) {
elementCount = size;
}
public void updateElementCount(Index key, int size, int uniqueSize) {
if (key.getPosition() == 0 && elementCount > -1) {
elementCount += size;
}
}
/**
* Moves the data from an old store to new after changes to table
* The colindex argument is the index of the column that was
* added or removed. The adjust argument is {-1 | 0 | +1}
*/
public final void moveData(Session session, PersistentStore other,
int colindex, int adjust) {
Type oldtype = null;
Type newtype = null;
Object colvalue = null;
if (adjust >= 0 && colindex != -1) {
ColumnSchema column = ((Table) table).getColumn(colindex);
colvalue = column.getDefaultValue(session);
newtype = ((Table) table).getColumnTypes()[colindex];
}
if (adjust <= 0 && colindex != -1) {
oldtype = ((Table) other.getTable()).getColumnTypes()[colindex];
}
RowIterator it = other.rowIterator();
Table table = (Table) this.table;
try {
while (it.hasNext()) {
Row row = it.getNextRow();
Object[] olddata = row.getData();
Object[] data = table.getEmptyRowData();
Object oldvalue = null;
if (adjust == 0 && colindex != -1) {
oldvalue = olddata[colindex];
colvalue = newtype.convertToType(session, oldvalue,
oldtype);
}
if (colvalue != null && newtype.isLobType()) {
session.sessionData.adjustLobUsageCount(colvalue, +1);
}
if (oldvalue != null && oldtype != null
&& oldtype.isLobType()) {
session.sessionData.adjustLobUsageCount(oldvalue, -1);
}
ArrayUtil.copyAdjustArray(olddata, data, colvalue, colindex,
adjust);
table.systemSetIdentityColumn(session, data);
table.enforceTypeLimits(session, data);
table.enforceRowConstraints(session, data);
// get object without RowAction
Row newrow = (Row) getNewCachedObject(null, data);
indexRow(null, newrow);
}
} catch (java.lang.OutOfMemoryError e) {
throw Error.error(ErrorCode.OUT_OF_MEMORY);
}
}
public void lock() {}
public void unlock() {}
void dropIndexFromRows(Index primaryIndex, Index oldIndex) {
RowIterator it = primaryIndex.firstRow(this);
int position = oldIndex.getPosition() - 1;
while (it.hasNext()) {
Row row = it.getNextRow();
int i = position - 1;
NodeAVL backnode = ((RowAVL) row).getNode(0);
while (i-- > 0) {
backnode = backnode.nNext;
}
backnode.nNext = backnode.nNext.nNext;
}
}
boolean insertIndexNodes(Index primaryIndex, Index newIndex) {
int position = newIndex.getPosition();
RowIterator it = primaryIndex.firstRow(this);
int rowCount = 0;
HsqlException error = null;
try {
while (it.hasNext()) {
Row row = it.getNextRow();
((RowAVL) row).insertNode(position);
// count before inserting
rowCount++;
newIndex.insert(null, this, row);
}
return true;
} catch (java.lang.OutOfMemoryError e) {
error = Error.error(ErrorCode.OUT_OF_MEMORY);
} catch (HsqlException e) {
error = e;
}
// backtrack on error
// rowCount rows have been modified
it = primaryIndex.firstRow(this);
for (int i = 0; i < rowCount; i++) {
Row row = it.getNextRow();
NodeAVL backnode = ((RowAVL) row).getNode(0);
int j = position;
while (--j > 0) {
backnode = backnode.nNext;
}
backnode.nNext = backnode.nNext.nNext;
}
throw error;
}
/**
* for result tables
*/
void reindex(Session session, Index index) {
setAccessor(index, null);
RowIterator it = table.rowIterator(this);
while (it.hasNext()) {
Row row = it.getNextRow();
// may need to clear the node before insert
index.insert(session, this, row);
}
}
}