package org.h2.index;
import org.h2.command.dml.AllColumnsForPlan;
import org.h2.engine.Session;
import org.h2.message.DbException;
import org.h2.result.Row;
import org.h2.result.SearchRow;
import org.h2.result.SortOrder;
import org.h2.table.FunctionTable;
import org.h2.table.IndexColumn;
import org.h2.table.TableFilter;
public class FunctionIndex extends BaseIndex {
private final FunctionTable functionTable;
public FunctionIndex(FunctionTable functionTable, IndexColumn[] columns) {
super(functionTable, 0, null, columns, IndexType.createNonUnique(true));
this.functionTable = functionTable;
}
@Override
public void close(Session session) {
}
@Override
public void add(Session session, Row row) {
throw DbException.getUnsupportedException("ALIAS");
}
@Override
public void remove(Session session, Row row) {
throw DbException.getUnsupportedException("ALIAS");
}
@Override
public boolean isFindUsingFullTableScan() {
return true;
}
@Override
public Cursor find(Session session, SearchRow first, SearchRow last) {
if (functionTable.isBufferResultSetToLocalTemp()) {
return new FunctionCursor(this, first, last, session, functionTable.getResult(session));
}
return new FunctionCursorResultSet(this, first, last, session,
functionTable.getResultSet(session));
}
@Override
public double getCost(Session session, int[] masks,
TableFilter[] filters, int filter, SortOrder sortOrder,
AllColumnsForPlan allColumnsSet) {
if (masks != null) {
throw DbException.getUnsupportedException("ALIAS");
}
long expectedRows;
if (functionTable.canGetRowCount()) {
expectedRows = functionTable.getRowCountApproximation();
} else {
expectedRows = database.getSettings().estimatedFunctionTableRows;
}
return expectedRows * 10;
}
@Override
public void remove(Session session) {
throw DbException.getUnsupportedException("ALIAS");
}
@Override
public void truncate(Session session) {
throw DbException.getUnsupportedException("ALIAS");
}
@Override
public boolean needRebuild() {
return false;
}
@Override
public void checkRename() {
throw DbException.getUnsupportedException("ALIAS");
}
@Override
public boolean canGetFirstOrLast() {
return false;
}
@Override
public Cursor findFirstOrLast(Session session, boolean first) {
throw DbException.getUnsupportedException("ALIAS");
}
@Override
public long getRowCount(Session session) {
return functionTable.getRowCount(session);
}
@Override
public long getRowCountApproximation() {
return functionTable.getRowCountApproximation();
}
@Override
public long getDiskSpaceUsed() {
return 0;
}
@Override
public String getPlanSQL() {
return "function";
}
@Override
public boolean canScan() {
return false;
}
}