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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * // Copyright (c) 1998, 2007, Oracle. All rights reserved.
 * 
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
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 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 */
package oracle.toplink.essentials.internal.parsing;

import oracle.toplink.essentials.expressions.*;

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

 *  Generate the correct expression for a LOCATE
 * 
 *    @author Jon Driscoll and Joel Lucuik
 *    @since TopLink 4.0
 */
public class LocateNode extends ArithmeticFunctionNode {
    private Node find = null;
    private Node findIn = null;
    private Node startPosition = null;

    /**
     * Return a new LocateNode.
     */
    public LocateNode() {
        super();
    }

    /** 
     * INTERNAL 
     * Check the child nodes for an unqualified field access and if so,
     * replace them by a qualified field access.     
     */
    public Node qualifyAttributeAccess(ParseTreeContext context) {
       if (find != null) {
           find = find.qualifyAttributeAccess(context);
       }
       if (findIn != null) {
           findIn = findIn.qualifyAttributeAccess(context);
       }
       if (startPosition != null) {
           startPosition = startPosition.qualifyAttributeAccess(context);
       }
       return this;
    }

    /**
     * INTERNAL
     * Validate node and calculate its type.
     */
    public void validate(ParseTreeContext context) {
        TypeHelper typeHelper = context.getTypeHelper();
        if (findIn != null) {
            findIn.validate(context);
            findIn.validateParameter(context, typeHelper.getStringType());
        }
        if (find != null) {
            find.validate(context);
            find.validateParameter(context, typeHelper.getStringType());
        }
        if (startPosition != null) {
            startPosition.validate(context);
            startPosition.validateParameter(context, typeHelper.getIntType());
        }
        setType(typeHelper.getIntType());
    }

    /**
     * INTERNAL
     * Generate the TopLink expression for this node
     */
    public Expression generateExpression(GenerationContext context) {
        Expression whereClause = getFindIn().generateExpression(context);
        Expression findExpr = getFind().generateExpression(context);
        if (startPosition != null) {
            whereClause = whereClause.locate(findExpr, getStartPosition().generateExpression(context));
        } else {
            whereClause = whereClause.locate(findExpr);
        }
        return whereClause;
    }

    // Accessors
    public Node getFind() {
        return find;
    }

    public Node getFindIn() {
        return findIn;
    }

    public void setFind(Node newFind) {
        find = newFind;
    }

    public void setFindIn(Node newFindIn) {
        findIn = newFindIn;
    }

    public Node getStartPosition() {
        return startPosition;
    }
    
    public void setStartPosition(Node newStartPosition) {
        startPosition = newStartPosition;
    }
    
}