/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE369_Divide_by_Zero__float_database_modulo_31.java
Label Definition File: CWE369_Divide_by_Zero__float.label.xml
Template File: sources-sinks-31.tmpl.java
*/
/*
 * @description
 * CWE: 369 Divide by zero
 * BadSource: database Read data from a database
 * GoodSource: A hardcoded non-zero number (two)
 * Sinks: modulo
 *    GoodSink: Check for zero before modulo
 *    BadSink : Modulo by a value that may be zero
 * Flow Variant: 31 Data flow: make a copy of data within the same method
 *
 * */




import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import java.util.logging.Level;

public class CWE369_Divide_by_Zero__float_database_modulo_31 extends AbstractTestCase
{
    public void bad() throws Throwable
    {
        float dataCopy;
        {
            float data;

            data = -1.0f; /* Initialize data */

            /* Read data from a database */
            {
                Connection connection = null;
                PreparedStatement preparedStatement = null;
                ResultSet resultSet = null;

                try
                {
                    /* setup the connection */
                    connection = IO.getDBConnection();

                    /* prepare and execute a (hardcoded) query */
                    preparedStatement = connection.prepareStatement("select name from users where id=0");
                    resultSet = preparedStatement.executeQuery();

                    /* POTENTIAL FLAW: Read data from a database query resultset */
                    String stringNumber = resultSet.getString(1);
                    if (stringNumber != null)
                    {
                        try
                        {
                            data = Float.parseFloat(stringNumber.trim());
                        }
                        catch (NumberFormatException exceptNumberFormat)
                        {
                            IO.logger.log(Level.WARNING, "Number format exception parsing data from string", exceptNumberFormat);
                        }
                    }
                }
                catch (SQLException exceptSql)
                {
                    IO.logger.log(Level.WARNING, "Error with SQL statement", exceptSql);
                }
                finally
                {
                    /* Close database objects */
                    try
                    {
                        if (resultSet != null)
                        {
                            resultSet.close();
                        }
                    }
                    catch (SQLException exceptSql)
                    {
                        IO.logger.log(Level.WARNING, "Error closing ResultSet", exceptSql);
                    }

                    try
                    {
                        if (preparedStatement != null)
                        {
                            preparedStatement.close();
                        }
                    }
                    catch (SQLException exceptSql)
                    {
                        IO.logger.log(Level.WARNING, "Error closing PreparedStatement", exceptSql);
                    }

                    try
                    {
                        if (connection != null)
                        {
                            connection.close();
                        }
                    }
                    catch (SQLException exceptSql)
                    {
                        IO.logger.log(Level.WARNING, "Error closing Connection", exceptSql);
                    }
                }
            }

            dataCopy = data;
        }
        {
            float data = dataCopy;

            /* POTENTIAL FLAW: Possibly modulo by zero */
            int result = (int)(100.0 % data);
            IO.writeLine(result);

        }
    }

    public void good() throws Throwable
    {
        goodG2B();
        goodB2G();
    }

    /* goodG2B() - use goodsource and badsink */
    private void goodG2B() throws Throwable
    {
        float dataCopy;
        {
            float data;

            /* FIX: Use a hardcoded number that won't a divide by zero */
            data = 2.0f;

            dataCopy = data;
        }
        {
            float data = dataCopy;

            /* POTENTIAL FLAW: Possibly modulo by zero */
            int result = (int)(100.0 % data);
            IO.writeLine(result);

        }
    }

    /* goodB2G() - use badsource and goodsink */
    private void goodB2G() throws Throwable
    {
        float dataCopy;
        {
            float data;

            data = -1.0f; /* Initialize data */

            /* Read data from a database */
            {
                Connection connection = null;
                PreparedStatement preparedStatement = null;
                ResultSet resultSet = null;

                try
                {
                    /* setup the connection */
                    connection = IO.getDBConnection();

                    /* prepare and execute a (hardcoded) query */
                    preparedStatement = connection.prepareStatement("select name from users where id=0");
                    resultSet = preparedStatement.executeQuery();

                    /* POTENTIAL FLAW: Read data from a database query resultset */
                    String stringNumber = resultSet.getString(1);
                    if (stringNumber != null)
                    {
                        try
                        {
                            data = Float.parseFloat(stringNumber.trim());
                        }
                        catch (NumberFormatException exceptNumberFormat)
                        {
                            IO.logger.log(Level.WARNING, "Number format exception parsing data from string", exceptNumberFormat);
                        }
                    }
                }
                catch (SQLException exceptSql)
                {
                    IO.logger.log(Level.WARNING, "Error with SQL statement", exceptSql);
                }
                finally
                {
                    /* Close database objects */
                    try
                    {
                        if (resultSet != null)
                        {
                            resultSet.close();
                        }
                    }
                    catch (SQLException exceptSql)
                    {
                        IO.logger.log(Level.WARNING, "Error closing ResultSet", exceptSql);
                    }

                    try
                    {
                        if (preparedStatement != null)
                        {
                            preparedStatement.close();
                        }
                    }
                    catch (SQLException exceptSql)
                    {
                        IO.logger.log(Level.WARNING, "Error closing PreparedStatement", exceptSql);
                    }

                    try
                    {
                        if (connection != null)
                        {
                            connection.close();
                        }
                    }
                    catch (SQLException exceptSql)
                    {
                        IO.logger.log(Level.WARNING, "Error closing Connection", exceptSql);
                    }
                }
            }

            dataCopy = data;
        }
        {
            float data = dataCopy;

            /* FIX: Check for value of or near zero before modulo */
            if (Math.abs(data) > 0.000001)
            {
                int result = (int)(100.0 % data);
                IO.writeLine(result);
            }
            else
            {
                IO.writeLine("This would result in a modulo by zero");
            }

        }
    }

    /* Below is the main(). It is only used when building this testcase on
     * its own for testing or for building a binary to use in testing binary
     * analysis tools. It is not used when compiling all the testcases as one
     * application, which is how source code analysis tools are tested.
     */
    public static void main(String[] args) throws ClassNotFoundException,
           InstantiationException, IllegalAccessException
    {
        mainFromParent(args);
    }
}
