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/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the "License").  You may not use this file except 
 * in compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt or 
 * https://glassfish.dev.java.net/public/CDDLv1.0.html. 
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * HEADER in each file and include the License file at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable, 
 * add the following below this CDDL HEADER, with the 
 * fields enclosed by brackets "[]" replaced with your 
 * own identifying information: Portions Copyright [yyyy] 
 * [name of copyright owner]
 */
// Copyright (c) 1998, 2007, Oracle. All rights reserved.  
package oracle.toplink.essentials.internal.parsing;

import java.util.*;

/**
 * INTERNAL
 * Purpose: Represent a FROM
 * 
Responsibilities:

 *  Determines the context for the Parse Tree
 * 
 Determine the reference class for a query
 * 
 Handle any FROM ... IN clauses
 * 
 *    @author Jon Driscoll
 *    @since TopLink 5.0
 */
public class FromNode extends MajorNode {

    private List declarations;

    public String getFirstVariable() {
        String variable = null;
        if ((declarations != null) && (declarations.size() > 0)) {
            variable = ((IdentificationVariableDeclNode)declarations.get(0)).getCanonicalVariableName();
        }
        return variable;
    }

    public List getDeclarations() {
        return declarations;
    }
    
    public void setDeclarations(List decls) {
        declarations = decls;
    }
    
    /** 
     * INTERNAL 
     * Check the declaration nodes for a path expression starting with a
     * unqualified field access and if so, replace it by a qualified field
     * access. 
     */
    public Node qualifyAttributeAccess(ParseTreeContext context) {
        for (int i = 0; i < declarations.size(); i++) {
            Node decl = (Node)declarations.get(i);
            declarations.set(i, decl.qualifyAttributeAccess(context));
        }
        return this;
    }
    
    /**
     * INTERNAL
     * Validate the current node.
     */
    public void validate(ParseTreeContext context) {
        for (Iterator i = declarations.iterator(); i.hasNext();) {
            Node decl = (Node)i.next();
            decl.validate(context);
        }
    }
}