URLConnectionSetProperty1.java

import specification.Borrowed;
import specification.Unique;
import java.io.IOException;
import java.io.InputStream;

public class SSSURLConnectionSetProperty1 {
    
    public static void example331538(@Borrowed URL address) {
        try {

            // Step 1) Open the connection
            URLConnection cnx = address.openConnection(); 

            // Step 2) Setup parameters and connection properties
            cnx.setAllowUserInteraction(false); // Step 2)
            cnx.setDoOutput(true);
            cnx.addRequestProperty("User-Agent",  "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)");


            // Step 3)
            cnx.connect(); 

            // Step 4)
            cnx.getContent();

            // Get the input stream and process it
            InputStream is = cnx.getInputStream();
            System.out.println("Successfully opened input stream.");

            // Ensure to close the InputStream after use
            is.close();

        } catch (IOException e) {
            // Handle exceptions related to network or stream issues
            System.err.println("Error: " + e.getMessage());
        }
    }
}
    

    

class URL{
    @Unique // @StateRefinement (return, to="manipulate")
    public URLConnection openConnection() {
        return new URLConnection();
    }
}

/**
 * --- openConnection() ----> [MANIPULATE PARAMS] ------> connect() -----> [INTERACT]
 *                            setAllowUserInteraction()                 getContent()
 *                            addRequestProperty()...                   getHeaderFields()...
 */
// @StateSet({"manipulate", "interact"})
class URLConnection{

    //@StateRefinement(this, from="manipulate")
    void setAllowUserInteraction(boolean b){}

    //@StateRefinement(this, from="manipulate")
    void setDoOutput(boolean b){}

    //@StateRefinement(this, from="manipulate")
    void addRequestProperty(String s1, String s2){}

    //@StateRefinement(this, from="manipulate", to="interact")
    void connect() throws IOException {}

    //@StateRefinement(this, from="interact")
    void getContent(){}


    //@StateRefinement(this, from="interact")
    @Unique //????? Not sure: Returns an input stream that reads from this open connection. 
    InputStream getInputStream(){ return null;}

}