?? metaindex.java
字號(hào):
/*
* Copyright 2004-2008 H2 Group. Licensed under the H2 License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.index;
import java.sql.SQLException;
import org.h2.engine.Session;
import org.h2.message.Message;
import org.h2.result.Row;
import org.h2.result.SearchRow;
import org.h2.table.Column;
import org.h2.table.IndexColumn;
import org.h2.table.MetaTable;
import org.h2.util.ObjectArray;
/**
* The index implementation for meta data tables.
*/
public class MetaIndex extends BaseIndex {
private MetaTable meta;
private boolean scan;
public MetaIndex(MetaTable meta, IndexColumn[] columns, boolean scan) {
super(meta, 0, null, columns, IndexType.createNonUnique(true));
this.meta = meta;
this.scan = scan;
}
public void close(Session session) throws SQLException {
// nothing to do
}
public void add(Session session, Row row) throws SQLException {
throw Message.getUnsupportedException();
}
public void remove(Session session, Row row) throws SQLException {
throw Message.getUnsupportedException();
}
public Cursor find(Session session, SearchRow first, SearchRow last) throws SQLException {
ObjectArray rows = meta.generateRows(session, first, last);
return new MetaCursor(rows);
}
public double getCost(Session session, int[] masks) throws SQLException {
if (scan) {
return 10000;
}
return getCostRangeIndex(masks, 1000);
}
public void truncate(Session session) throws SQLException {
throw Message.getUnsupportedException();
}
public void remove(Session session) throws SQLException {
throw Message.getUnsupportedException();
}
public int getColumnIndex(Column col) {
if (scan) {
// the scan index cannot use any columns
return -1;
}
return super.getColumnIndex(col);
}
public void checkRename() throws SQLException {
throw Message.getUnsupportedException();
}
public boolean needRebuild() {
return false;
}
public String getCreateSQL() {
return null;
}
public boolean canGetFirstOrLast() {
return false;
}
public SearchRow findFirstOrLast(Session session, boolean first) throws SQLException {
throw Message.getUnsupportedException();
}
}
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