Scenarios to use dynamic UI access and creation.

Hi,
I would like to know the possible scenarios to use Dynamic UI creation or access. Since so far I don't find any compelling need to use dynamic UI creation or other dynamic access to UI element.
ThanQ for Ur time.
Cheers,
Sam

Hi Sam.
Dynamic Ui creation is only neede if you do not know which or how many UI
elements you need during design time.
We have one scenario where we need to generate select options for reports dynamically. The
select options are defined in application tables and read during run time. So
depending on the defined option in the table for a certain report, the selction UI is
built dynamically.
Many cases can be handled by using context attributes for the UI element
properties e.g. (read only, visibility or required/normal item). We have some views
where only certain user types have to enter certain data. So depending on the
user type the visibility or required property of input fields is controlled by context
sttibutes.
But this is just one point of view. I guess there cvan be a lot of scenarios where
dynamic UI creation is needed.
Anyway, always consider that dynamic UI creation is less maintainable cause
code is harder to read and understand.
Cheers,
Sascha

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*** Main: Variant 1 JAR 1 ***:
Entering TestClass1.testMethod() packaged in JAR1.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR1.jar
*** Main: Variant 1 JAR 2 ***:
Entering TestClass1.testMethod() packaged in JAR2.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR2.jar
*** Main: Variant 2 JAR 1 ***:
Entering TestClass1.testMethod() packaged in JAR1.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR1.jar
*** Main: Variant 2 JAR 2 ***:
Entering TestClass1.testMethod() packaged in JAR2.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR2.jar
*** UC1: Variant 1 JAR 1 ***:
Entering TestClass1.testMethod() packaged in JAR1.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR1.jar
*** UC1: Variant 1 JAR 2 ***:
Entering TestClass1.testMethod() packaged in JAR2.jar
About to instantiate TestClass2 with the new operator
About to call TestClass2.testMethod()
Entering TestClass2.testMethod() packaged in JAR2.jar
*** static UC2: Variant 2 JAR 1 ***:
Exception in thread "main" java.lang.NoClassDefFoundError: TestClass1
        at UC2.runFromJarVariant2_static(UC2.java:56)
        at TestClassPathMain.main(TestClassPathMain.java:52)
TestClassPathMain.java
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
public class TestClassPathMain {
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                    "\nFor the purpose of the test, it shouldn't have been!" +
                    "\nExiting");
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            System.out.println("\n*** Main: Variant 1 JAR 2 ***:");
            runFromJarVariant1("file:/W:/java/eclipse/workspaces/simped_test/CP2/JAR2.jar");
            // Works fine
            System.out.println("\n*** Main: Variant 2 JAR 1 ***:");
            runFromJarVariant1("file:/W:/java/eclipse/workspaces/simped_test/CP1/JAR1.jar");
            System.out.println("\n*** Main: Variant 2 JAR 2 ***:");
            runFromJarVariant1("file:/W:/java/eclipse/workspaces/simped_test/CP2/JAR2.jar");
            // Works fine
            final UC1 uc1 = new UC1();
            System.out.println("\n*** UC1: Variant 1 JAR 1 ***:");
            uc1.runFromJarVariant1("file:/W:/java/eclipse/workspaces/simped_test/CP1/JAR1.jar");
            System.out.println("\n*** UC1: Variant 1 JAR 2 ***:");
            uc1.runFromJarVariant1("file:/W:/java/eclipse/workspaces/simped_test/CP2/JAR2.jar");
            // Crashes
            System.out.println("\n*** static UC2: Variant 2 JAR 1 ***:");
            UC2.runFromJarVariant2_static("file:/W:/java/eclipse/workspaces/simped_test/CP1/JAR1.jar");
            System.out.println("\n*** static UC2: Variant 2 JAR 2 ***:");
            UC2.runFromJarVariant2_static("file:/W:/java/eclipse/workspaces/simped_test/CP2/JAR2.jar");
            // Crashes
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            uc2.runFromJarVariant2("file:/W:/java/eclipse/workspaces/simped_test/CP1/JAR1.jar");
            System.out.println("\n*** UC2: Variant 2 JAR 2 ***:");
            uc2.runFromJarVariant2("file:/W:/java/eclipse/workspaces/simped_test/CP2/JAR2.jar");
    private static void runFromJarVariant1(final String jarFileURL)
        throws MalformedURLException,
               ClassNotFoundException,
               InstantiationException,
               IllegalArgumentException,
               IllegalAccessException,
               InvocationTargetException,
               SecurityException,
               NoSuchMethodException {
        final URL url = new URL(jarFileURL);
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                               Thread.currentThread().getContextClassLoader());
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        final Object testClass1 = clazz.newInstance();
        final Method testMethod1 = clazz.getMethod("testMethod", null);
        testMethod1.invoke(testClass1, null);
    private static void runFromJarVariant2(final String jarFileURL)
        throws MalformedURLException,
               ClassNotFoundException,
               InstantiationException,
               IllegalArgumentException,
               IllegalAccessException,
               InvocationTargetException,
               SecurityException,
               NoSuchMethodException {
        final URL url = new URL(jarFileURL);
        final URLClassLoader cl =
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                               Thread.currentThread().getContextClassLoader());
        final Class clazz = cl.loadClass("TestClass1");
        final TestClass1 testClass1 = new TestClass1();
        testClass1.testMethod();
UC1.java
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
public class UC1 {
    public void runFromJarVariant1(final String jarFileURL)
        throws MalformedURLException,
               ClassNotFoundException,
               InstantiationException,
               IllegalArgumentException,
               IllegalAccessException,
               InvocationTargetException,
               SecurityException,
               NoSuchMethodException {
        final URL url = new URL(jarFileURL);
        final URLClassLoader cl =
            new URLClassLoader(new URL[]{url},
                               Thread.currentThread().getContextClassLoader());
        final Class clazz = cl.loadClass("TestClass1");
        final Object testClass1 = clazz.newInstance();
        final Method testMethod1 = clazz.getMethod("testMethod", null);
        testMethod1.invoke(testClass1, null);
UC2.java
import java.lang.reflect.InvocationTargetException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
public class UC2 {
    public void runFromJarVariant2(final String jarFileURL)
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           IllegalAccessException,
           InvocationTargetException,
           SecurityException,
           NoSuchMethodException {
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        final URLClassLoader cl =
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                               Thread.currentThread().getContextClassLoader());
        final Class clazz = cl.loadClass("TestClass1");
        final TestClass1 testClass1 = new TestClass1();
        testClass1.testMethod();
     * Identic to the "runFromJarVariant2" method,
     * except that it is static
    public static void runFromJarVariant2_static(final String jarFileURL)
    throws MalformedURLException,
           ClassNotFoundException,
           InstantiationException,
           IllegalArgumentException,
           IllegalAccessException,
           InvocationTargetException,
           SecurityException,
           NoSuchMethodException {
        final URL url = new URL(jarFileURL);
        final URLClassLoader cl =
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        final TestClass1 testClass1 = new TestClass1();
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the same environment) of the current running
aplication, so that when the loaded class is run, it
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(I was talking about relatively esoteric "security"
issues when I mentioned the stuff about Class objects
"scope".) You might use the URLClassLoader kind of
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Pseudo-code follows:
// setup the class loader
URL[] urls = new URL[1];
urls[0] = new URL("/path/to/dynamic/classes");
URLClassLoader ucl = new URLClassLoader(urls);
// load a class & use make an object with the default constructor
Object tmp = ucl.loadClass("dynamic.class.name").newInstance();
// Cast the object to a know interface so that you can use it.
// This may be used to further determine which interface to cast
// the class to. Or it may simply be the interface to which all
// dynamic classes have to conform in your program.
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users need a different page to review what they input from the
original page? What added value will there be?

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Hi Stratos
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I'm working with some persistent objects, but don't know the actual persistent class until runttime. To get the agent, I've coded this
DATA: l_agntclass TYPE classname,
     lr_det_agent TYPE REF TO cl_os_ca_common.
FIELD-SYMBOLS <lr_det_agent> TYPE any.
l_agntclass = me->derive_agent_classname( ).
ASSIGN (l_agntclass)=>agent to <lr_det_agent>.
lr_det_agent ?= <lr_det_agent>.
Now I can call the methods of lr_det_agent. All well and good, and it works, but is this the right way? I tried defining <lr_det_agent> as TYPE REF TO. But that failed in the assign. And I tried CASTING TYPE on the assign, but that doesn't accept classes.
Am I missing something obvious?
Thanks
matt

Hello Matt
The solution is quite simple (see below):
*& Report ZUS_SDN_PERSISTENT_CLASS
*& Thread: Use AGENT through dynamic attribute access
*& <a class="jive_macro jive_macro_thread" href="" __jive_macro_name="thread" modifiedtitle="true" __default_attr="1143122"></a>
REPORT zus_sdn_persistent_class.
DATA: gd_clsname    TYPE classname,
      gd_method     TYPE string,
      gd_attribute TYPE string.
DATA: go_obj        TYPE REF TO object, " root object
      go_os_common TYPE REF TO cl_os_ca_common.
DATA: go_persist    TYPE REF TO cb_alert,
      go_agent      TYPE REF TO ca_alert.
FIELD-SYMBOLS <go_det_agent> TYPE ANY.
START-OF-SELECTION.
BREAK-POINT.
gd_attribute = 'CA_ALERT=>AGENT'.
" In your case: CONCATENATE l_agntclass '=>AGENT' ...
ASSIGN (gd_attribute) TO <go_det_agent>.
go_os_common ?= <go_det_agent>.
BREAK-POINT.
END-OF-SELECTION.
Regards
Uwe

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