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package oracle.toplink.essentials.internal.expressions;

import java.io.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.internal.databaseaccess.DatabaseCall;
import oracle.toplink.essentials.internal.sessions.AbstractSession;

/**
 * <p><b>Purpose</b>: Print DELETE statement.
 * <p><b>Responsibilities</b>:<ul>
 * <li> Print DELETE statement.
 * </ul>
 * @author Dorin Sandu
 * @since TOPLink/Java 1.0
 */
public class SQLDeleteStatement extends SQLModifyStatement {

    /**
     * Append the string containing the SQL insert string for the given table.
     */
    public DatabaseCall buildCall(AbstractSession session) {
        SQLCall call = new SQLCall();
        call.returnNothing();

        Writer writer = new CharArrayWriter(100);
        try {
            writer.write("DELETE ");
            writer.write("FROM ");
            writer.write(getTable().getQualifiedName());

            if (getWhereClause() != null) {
                writer.write(" WHERE ");
                ExpressionSQLPrinter printer = new ExpressionSQLPrinter(session, getTranslationRow(), call, false);
                printer.setWriter(writer);
                printer.printExpression(getWhereClause());
            }

            call.setSQLString(writer.toString());
        } catch (IOException exception) {
            throw ValidationException.fileError(exception);
        }
        return call;
    }
}