/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE690_NULL_Deref_From_Return__System_getProperty_equals_17.java
Label Definition File: CWE690_NULL_Deref_From_Return.label.xml
Template File: sources-sinks-17.tmpl.java
*/
/*
* @description
* CWE: 690 Unchecked return value is null, leading to a null pointer dereference.
* BadSource: System_getProperty Set data to return of System.getProperty
* GoodSource: Set data to fixed, non-null String
* Sinks: equals
*    GoodSink: Call equals() on string literal (that is not null)
*    BadSink : Call equals() on possibly null object
* Flow Variant: 17 Control flow: for loops
*
* */







public class CWE690_NULL_Deref_From_Return__System_getProperty_equals_17 extends AbstractTestCase
{
    public void bad() throws Throwable
    {
        String data;

        /* We need to have one source outside of a for loop in order
         * to prevent the Java compiler from generating an error because
         * data is uninitialized
         */

        /* POTENTIAL FLAW: data may be set to null */
        data = System.getProperty("CWE690");

        for (int j = 0; j < 1; j++)
        {
            /* POTENTIAL FLAW: data could be null */
            if(data.equals("CWE690"))
            {
                IO.writeLine("data is CWE690");
            }
        }
    }

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

        /* FIX: Set data to a fixed, non-null String */
        data = "CWE690";

        for (int j = 0; j < 1; j++)
        {
            /* POTENTIAL FLAW: data could be null */
            if(data.equals("CWE690"))
            {
                IO.writeLine("data is CWE690");
            }
        }
    }

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

        /* POTENTIAL FLAW: data may be set to null */
        data = System.getProperty("CWE690");

        for (int k = 0; k < 1; k++)
        {
            /* FIX: call equals() on string literal (that is not null) */
            if("CWE690".equals(data))
            {
                IO.writeLine("data is CWE690");
            }
        }
    }

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

    /* 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);
    }
}
