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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;

/**
 * <p><b>Purpose</b>: Mirror SQL behavior.
 * <p><b>Responsibilities</b>:<ul>
 * <li> Mirror SQL behavior.
 * <li> Print as SQL string.
 * </ul>
 *    @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();
    }
}