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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
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
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 * Contributor(s):
 * 
 * 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
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */
package oracle.toplink.essentials.internal.expressions;

import java.io.*;
import oracle.toplink.essentials.internal.helper.*;
import oracle.toplink.essentials.internal.sessions.DatabaseSessionImpl;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.internal.databaseaccess.DatabaseCall;
import oracle.toplink.essentials.internal.sessions.AbstractRecord;
import oracle.toplink.essentials.internal.sessions.AbstractSession;

/**
 * Purpose: Mirror SQL behavior.
 * 
Responsibilities:

 *  Mirror SQL behavior.
 * 
 Print as SQL string.
 * 
 *    @author Dorin Sandu
 *    @since TOPLink/Java 1.0
 */
public abstract class SQLStatement implements Serializable, Cloneable {
    protected Expression whereClause;
    protected ExpressionBuilder builder;
    protected AbstractRecord translationRow;

    /**
     * Return SQL call for the statement, through generating the SQL string.
     */
    public abstract DatabaseCall buildCall(AbstractSession session);

    /**
     * Clone the Statement
     */
    public Object clone() {
        try {
            return super.clone();
        } catch (CloneNotSupportedException e) {
            throw new InternalError();
        }
    }

    public ExpressionBuilder getBuilder() {
        return builder;
    }

    public ExpressionBuilder getExpressionBuilder() {
        return builder;
    }

    /**
     * INTERNAL:
     * Return the row for translation
     */
    public AbstractRecord getTranslationRow() {
        return translationRow;
    }

    public Expression getWhereClause() {
        return whereClause;
    }

    protected void setBuilder(ExpressionBuilder aBuilder) {
        builder = aBuilder;
    }

    /**
     * INTERNAL:
     * Set the row for translation
     */
    public void setTranslationRow(AbstractRecord theRow) {
        translationRow = theRow;
    }

    public void setWhereClause(Expression expression) {
        whereClause = expression;
        if (expression != null) {
            builder = expression.getBuilder();
        }
    }

    /**
     * Try to print the SQL.
     */
    public String toString() {
        StringWriter writer = new StringWriter();
        writer.write(Helper.getShortClassName(getClass()));
        writer.write("(");

        try {
            DatabaseCall call = buildCall(new DatabaseSessionImpl(new oracle.toplink.essentials.sessions.DatabaseLogin()));
            writer.write(call.getSQLString());
        } catch (Exception exception) {
        }
        writer.write(")");

        return writer.toString();
    }
}