SetTransactionAccessNode.java

/**
 * Copyright © 2012 Akiban Technologies, Inc.  All rights
 * reserved.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v1.0 which
 * accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * This program may also be available under different license terms.
 * For more information, see www.akiban.com or contact
 * licensing@akiban.com.
 *
 * Contributors:
 * Akiban Technologies, Inc.
 */

/* The original from which this derives bore the following: */

/*

   Derby - Class org.apache.derby.impl.sql.compile.SetTransactionIsolationNode

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to you under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */

package com.akiban.sql.parser;

import com.akiban.sql.StandardException;

/**
 * A SetTransactionAccessNode is the root of a QueryTree that represents a SET
 * TRANSACTION READ ONLY / WRITE command
 *
 */

public class SetTransactionAccessNode extends TransactionStatementNode
{
    private boolean current;
    private AccessMode accessMode;

    /**
     * Initializer for SetTransactionAccessNode
     *
     * @param current Whether applies to current transaction or session default
     * @param isolationLevel The new isolation level
     */
    public void init(Object current,
                     Object accessMode) {
        this.current = (Boolean)current;
        this.accessMode = (AccessMode)accessMode;
    }

    /**
     * Fill this node with a deep copy of the given node.
     */
    public void copyFrom(QueryTreeNode node) throws StandardException {
        super.copyFrom(node);

        SetTransactionAccessNode other = (SetTransactionAccessNode)node;
        this.current = other.current;
        this.accessMode = other.accessMode;
    }

    /**
     * Convert this object to a String.  See comments in QueryTreeNode.java
     * for how this should be done for tree printing.
     *
     * @return This object as a String
     */

    public String toString() {
        return "current: " + current + "\n" +
               "accessMode: " + accessMode + "\n" +
            super.toString();
    }

    public boolean isCurrent() {
        return current;
    }

    public AccessMode getAccessMode() {
        return accessMode;
    }

    public String statementToString() {
        if (current)
            return "SET TRANSACTION";
        else
            return "SET SESSION CHARACTERISTICS AS TRANSACTION";
    }

}