/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. you can redistribute it and/or modify it under the
* terms of the GNU General Public License version 2 only, as published by the
* Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package com.akiban.sql.parser;
/**
* This node represents either a unary
* IS NULL or IS NOT NULL comparison operator
*
*/
public final class IsNullNode extends UnaryComparisonOperatorNode
{
public void setNodeType(int nodeType)
{
String operator;
String methodName;
if (nodeType == NodeTypes.IS_NULL_NODE) {
/* By convention, the method name for the is null operator is "isNull" */
operator = "is null";
methodName = "isNull";
}
else {
assert (nodeType == NodeTypes.IS_NOT_NULL_NODE);
/* By convention, the method name for the is not null operator is
* "isNotNull"
*/
operator = "is not null";
methodName = "isNotNull";
}
setOperator(operator);
setMethodName(methodName);
super.setNodeType(nodeType);
}
}