/*
 * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
 * and the EPL 1.0 (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package org.h2.command.ddl;

import org.h2.api.ErrorCode;
import org.h2.command.CommandInterface;
import org.h2.engine.Database;
import org.h2.engine.Right;
import org.h2.engine.Session;
import org.h2.index.Index;
import org.h2.message.DbException;
import org.h2.schema.Schema;

/**
 * This class represents the statement
 * ALTER INDEX RENAME
 */
public class AlterIndexRename extends DefineCommand {

    private Index oldIndex;
    private String newIndexName;

    public AlterIndexRename(Session session) {
        super(session);
    }

    public void setOldIndex(Index index) {
        oldIndex = index;
    }

    public void setNewName(String name) {
        newIndexName = name;
    }

    @Override
    public int update() {
        session.commit(true);
        Database db = session.getDatabase();
        Schema schema = oldIndex.getSchema();
        if (schema.findIndex(session, newIndexName) != null ||
                newIndexName.equals(oldIndex.getName())) {
            throw DbException.get(ErrorCode.INDEX_ALREADY_EXISTS_1,
                    newIndexName);
        }
        session.getUser().checkRight(oldIndex.getTable(), Right.ALL);
        db.renameSchemaObject(session, oldIndex, newIndexName);
        return 0;
    }

    @Override
    public int getType() {
        return CommandInterface.ALTER_INDEX_RENAME;
    }

}
