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package org.hsqldb;
import org.hsqldb.HsqlNameManager.HsqlName;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.ArrayUtil;
import org.hsqldb.lib.HashMappedList;
import org.hsqldb.navigator.RowIterator;
import org.hsqldb.navigator.RowSetNavigatorData;
import org.hsqldb.navigator.RowSetNavigatorDataTable;
import org.hsqldb.persist.PersistentStore;
import org.hsqldb.result.Result;
import org.hsqldb.types.Type;
/**
* Table with data derived from a query expression.
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.0
* @since 1.9.0
*/
public class TableDerived extends Table {
//
public final static TableDerived[] emptyArray = new TableDerived[]{};
//
QueryExpression queryExpression;
Expression dataExpression;
boolean uniqueRows;
boolean uniquePredicate;
String sql;
View view;
int depth;
boolean canRecompile = false;
public TableDerived(Database database, HsqlName name, int type) {
super(database, name, type);
switch (type) {
// for special use, not INFORMATION_SCHEMA views
case TableBase.CHANGE_SET_TABLE :
case TableBase.SYSTEM_TABLE :
case TableBase.FUNCTION_TABLE :
case TableBase.VIEW_TABLE :
case TableBase.RESULT_TABLE :
case TableBase.SYSTEM_SUBQUERY :
break;
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Table");
}
}
public TableDerived(Database database, HsqlName name, int type,
Type[] columnTypes, HashMappedList columnList,
int[] pkColumns) {
this(database, name, type);
this.colTypes = columnTypes;
this.columnList = columnList;
columnCount = columnList.size();
createPrimaryKey(null, pkColumns, true);
}
public TableDerived(Database database, HsqlName name, int type,
QueryExpression queryExpression,
Expression dataExpression, int opType, int depth) {
super(database, name, type);
switch (type) {
case TableBase.SYSTEM_SUBQUERY :
case TableBase.VIEW_TABLE :
break;
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Table");
}
this.queryExpression = queryExpression;
this.dataExpression = dataExpression;
this.depth = depth;
switch (opType) {
case OpTypes.EXISTS :
queryExpression.setSingleRow();
break;
case OpTypes.IN :
if (queryExpression != null) {
queryExpression.setFullOrder();
}
uniqueRows = true;
break;
case OpTypes.UNIQUE :
queryExpression.setFullOrder();
uniquePredicate = true;
break;
}
if (dataExpression != null) {
dataExpression.table = this;
}
}
public TableDerived newDerivedTable(Session session) {
TableDerived td = this;
if (isRecompiled()) {
ParserDQL p = new ParserDQL(session, new Scanner(),
session.parser.compileContext);
p.reset(sql);
p.read();
td = p.XreadSubqueryTableBody(tableName, OpTypes.TABLE_SUBQUERY);
td.queryExpression.resolve(session);
td.columnList = columnList;
td.columnCount = columnList.size();
td.triggerList = triggerList;
td.triggerLists = triggerLists;
td.view = view;
td.createPrimaryKey();
}
return td;
}
public int getId() {
return 0;
}
public boolean isQueryBased() {
return true;
}
public boolean isWritable() {
return true;
}
public boolean isInsertable() {
if (view != null && view.isTriggerInsertable) {
return false;
}
return queryExpression == null ? false
: queryExpression.isInsertable();
}
public boolean isUpdatable() {
if (view != null && view.isTriggerUpdatable) {
return false;
}
return queryExpression == null ? false
: queryExpression.isUpdatable();
}
public int[] getUpdatableColumns() {
if (queryExpression != null) {
return queryExpression.getBaseTableColumnMap();
}
return defaultColumnMap;
}
public boolean isTriggerInsertable() {
if (view != null) {
return view.isTriggerInsertable;
}
return false;
}
public boolean isTriggerUpdatable() {
if (view != null) {
return view.isTriggerUpdatable;
}
return false;
}
public boolean isTriggerDeletable() {
if (view != null) {
return view.isTriggerDeletable;
}
return false;
}
public Table getBaseTable() {
return queryExpression == null ? this
: queryExpression.getBaseTable();
}
public int[] getBaseTableColumnMap() {
return queryExpression == null ? null
: queryExpression
.getBaseTableColumnMap();
}
public QueryExpression getQueryExpression() {
return queryExpression;
}
public Expression getDataExpression() {
return dataExpression;
}
public void prepareTable() {
if (columnCount > 0) {
return;
}
if (dataExpression != null) {
if (columnCount == 0) {
TableUtil.addAutoColumns(this, dataExpression.nodeDataTypes);
setTableIndexesForSubquery();
}
}
if (queryExpression != null) {
columnList = queryExpression.getColumns();
columnCount = queryExpression.getColumnCount();
setTableIndexesForSubquery();
}
}
public void prepareTable(HsqlName[] columns) {
prepareTable();
if (columns != null) {
if (columns.length != columnList.size()) {
throw Error.error(ErrorCode.X_42593);
}
for (int i = 0; i < columnCount; i++) {
columnList.setKey(i, columns[i].name);
ColumnSchema col = (ColumnSchema) columnList.get(i);
col.setName(columns[i]);
}
}
}
private void setTableIndexesForSubquery() {
int[] cols = null;
if (uniqueRows || uniquePredicate) {
cols = new int[getColumnCount()];
ArrayUtil.fillSequence(cols);
}
int pkcols[] = uniqueRows ? cols
: null;
if (primaryKeyCols == null) {
createPrimaryKey(null, pkcols, false);
}
if (uniqueRows) {
fullIndex = getPrimaryIndex();
} else if (uniquePredicate) {
fullIndex = createIndexForColumns(null, cols);
}
}
void setCorrelated() {
if (dataExpression != null) {
dataExpression.isCorrelated = true;
}
if (queryExpression != null) {
queryExpression.isCorrelated = true;
}
}
boolean isCorrelated() {
if (dataExpression != null) {
return dataExpression.isCorrelated;
}
if (queryExpression != null) {
return queryExpression.isCorrelated;
}
return false;
}
boolean hasUniqueNotNullRows(Session session) {
return getNavigator(session).hasUniqueNotNullRows(session);
}
void resetToView() {
queryExpression = view.getQueryExpression();
}
public void materialise(Session session) {
session.sessionContext.pushStatementState();
try {
PersistentStore store;
// table constructors
if (dataExpression != null) {
store = session.sessionData.getSubqueryRowStore(this);
dataExpression.insertValuesIntoSubqueryTable(session, store);
return;
}
if (queryExpression == null) {
return;
}
Result result;
result = queryExpression.getResult(session, 0);
if (uniqueRows) {
RowSetNavigatorData navigator =
((RowSetNavigatorData) result.getNavigator());
navigator.removeDuplicates(session);
}
store = session.sessionData.getSubqueryRowStore(this);
insertResult(session, store, result);
result.getNavigator().release();
} finally {
session.sessionContext.popStatementState();
}
}
public void materialiseCorrelated(Session session) {
if (isCorrelated()) {
materialise(session);
}
}
public boolean isRecompiled() {
if (canRecompile && queryExpression instanceof QuerySpecification) {
QuerySpecification qs = (QuerySpecification) queryExpression;
if (qs.isAggregated || qs.isGrouped || qs.isOrderSensitive) {
return false;
} else {
return true;
}
}
return false;
}
public Object[] getValues(Session session) {
RowIterator it = rowIterator(session);
if (it.hasNext()) {
Row row = it.getNextRow();
if (it.hasNext()) {
throw Error.error(ErrorCode.X_21000);
}
return row.getData();
} else {
return new Object[getColumnCount()];
}
}
public Object getValue(Session session) {
Object[] data = getValues(session);
return data[0];
}
public RowSetNavigatorData getNavigator(Session session) {
RowSetNavigatorData navigator = new RowSetNavigatorDataTable(session,
this);
return navigator;
}
public void setSQL(String sql) {
this.sql = sql;
}
}