/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE690_NULL_Deref_From_Return__Class_String_45.java
Label Definition File: CWE690_NULL_Deref_From_Return__Class.label.xml
Template File: sources-sinks-45.tmpl.java
*/
/*
 * @description
 * CWE: 690 Unchecked return value is null, leading to a null pointer dereference.
 * BadSource:  Use a custom method which may return null
 * GoodSource: Use a custom method that never returns null
 * Sinks: trim
 *    GoodSink: Check data for null before calling trim()
 *    BadSink : Call trim() on possibly null object
 * Flow Variant: 45 Data flow: data passed as a private class member variable from one function to another in the same class
 *
 * */





public class CWE690_NULL_Deref_From_Return__Class_String_45 extends AbstractTestCase
{
    private String dataBad;
    private String dataGoodG2B;
    private String dataGoodB2G;

    private void badSink() throws Throwable
    {
        String data = dataBad;

        /* POTENTIAL FLAW: data could be null */
        String stringTrimmed = data.trim();

        IO.writeLine(stringTrimmed);

    }

    public void bad() throws Throwable
    {
        String data;

        /* POTENTIAL FLAW: Call getStringBad(), which may return null */
        data = CWE690_NULL_Deref_From_Return__Class_Helper.getStringBad();

        dataBad = data;
        badSink();
    }

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

    private void goodG2BSink() throws Throwable
    {
        String data = dataGoodG2B;

        /* POTENTIAL FLAW: data could be null */
        String stringTrimmed = data.trim();

        IO.writeLine(stringTrimmed);

    }

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

        /* FIX: call getStringGood(), which will never return null */
        data = CWE690_NULL_Deref_From_Return__Class_Helper.getStringGood();

        dataGoodG2B = data;
        goodG2BSink();
    }

    private void goodB2GSink() throws Throwable
    {
        String data = dataGoodB2G;

        /* FIX: explicit check for null */
        if (data != null)
        {
            String stringTrimmed = data.trim();
            IO.writeLine(stringTrimmed);
        }

    }

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

        /* POTENTIAL FLAW: Call getStringBad(), which may return null */
        data = CWE690_NULL_Deref_From_Return__Class_Helper.getStringBad();

        dataGoodB2G = data;
        goodB2GSink();
    }

    /* 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);
    }
}
