/**
 * Copyright 2011-2013 FoundationDB, LLC
 * 
 * Licensed 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.
 */

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

/*

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

   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.bj58.sql.parser;

import com.bj58.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);
        }
    }

}
