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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
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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
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 * 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 LIKE in EJBQL
 * 
Responsibilities:

 *  Generate the correct expression for a LIKE
 * 
 *    @author Jon Driscoll and Joel Lucuik
 *    @since TopLink 4.0
 */
public class LikeNode extends SimpleConditionalExpressionNode {
    private EscapeNode escape = null;

    /**
     * LikeNode constructor comment.
     */
    public LikeNode() {
        super();
    }

    /**
     * INTERNAL
     * Validate the current node and calculates its type.
     */
    public void validate(ParseTreeContext context) {
        TypeHelper typeHelper = context.getTypeHelper();
        if (left != null) {
            left.validate(context);
            left.validateParameter(context, typeHelper.getStringType());
        }
        if (right != null) {
            right.validate(context);
            right.validateParameter(context, typeHelper.getStringType());
        } 
        
        if (escape != null) {
            escape.validate(context);
        }
        
        setType(typeHelper.getBooleanType());
    }

    /**
     * INTERNAL
     * Return a TopLink expression for this node.
     */
    public Expression generateExpression(GenerationContext context) {
        Expression whereClause = getLeft().generateExpression(context);
        if (!hasEscape()) {
            whereClause = whereClause.like(getRight().generateExpression(context));
        } else {
            whereClause = whereClause.like(getRight().generateExpression(context), getEscapeNode().generateExpression(context));
        }
        return whereClause;
    }

    public boolean hasEscape() {
        return getEscapeNode() != null;
    }

    // Accessors
    public EscapeNode getEscapeNode() {
        return escape;
    }

    public void setEscapeNode(EscapeNode node) {
        escape = node;
    }
}