/*
* 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;
import com.akiban.sql.StandardException;
/**
* A SingleChildResultSetNode represents a result set with a single child.
*
*/
abstract class SingleChildResultSetNode extends FromTable
{
/**
* ResultSetNode under the SingleChildResultSetNode
*/
ResultSetNode childResult;
/**
* Initialilzer for a SingleChildResultSetNode.
*
* @param childResult The child ResultSetNode
* @param tableProperties Properties list associated with the table
*/
public void init(Object childResult, Object tableProperties) {
/* correlationName is always null */
super.init(null, tableProperties);
this.childResult = (ResultSetNode)childResult;
}
/**
* Fill this node with a deep copy of the given node.
*/
public void copyFrom(QueryTreeNode node) throws StandardException {
super.copyFrom(node);
SingleChildResultSetNode other = (SingleChildResultSetNode)node;
this.childResult = (ResultSetNode)getNodeFactory().copyNode(other.childResult,
getParserContext());
}
/**
* Return the childResult from this node.
*
* @return ResultSetNode The childResult from this node.
*/
public ResultSetNode getChildResult() {
return childResult;
}
/**
* Set the childResult for this node.
*
* @param childResult The new childResult for this node.
*/
void setChildResult(ResultSetNode childResult) {
this.childResult = childResult;
}
/**
* Prints the sub-nodes of this object. See QueryTreeNode.java for
* how tree printing is supposed to work.
*
* @param depth The depth of this node in the tree
*/
public void printSubNodes(int depth) {
super.printSubNodes(depth);
if (childResult != null) {
printLabel(depth, "childResult: ");
childResult.treePrint(depth + 1);
}
}
/**
* Accept the visitor for all visitable children of this node.
*
* @param v the visitor
*
* @exception StandardException on error
*/
void acceptChildren(Visitor v) throws StandardException {
super.acceptChildren(v);
if (childResult != null) {
childResult = (ResultSetNode)childResult.accept(v);
}
}
}