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/*

 * @test

 * @summary class p1.c1 defined in m1 tries to access p2.c2 defined in unnamed module.

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 * @modules java.base/jdk.internal.module

 * @compile myloaders/MySameClassLoader.java

 * @compile p2/c2.java

 * @compile p1/c1.java

 * @compile p1/c1ReadEdge.java

 * @compile p1/c1Loose.java

 * @run main/othervm -Xbootclasspath/a:. Umod

 */

import static jdk.test.lib.Asserts.*;

import java.lang.reflect.Layer;

import java.lang.module.Configuration;

import java.lang.module.ModuleDescriptor;

import java.lang.module.ModuleFinder;

import java.lang.reflect.Module;

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

import myloaders.MySameClassLoader;

//

// ClassLoader1 --> defines m1 --> packages p1

//                  package p1 in m1 is exported unqualifiedly

//

// class p1.c1 defined in m1 tries to access p2.c2 defined in

// in unnamed module.

//

// Three access attempts occur in this test:

//   1. The first access is not allowed because a strict module

//      cannot read an unnamed module.

//   2. In this scenario a strict module establishes readability

//      to the particular unnamed module it is trying to access.

//      Access is allowed.

//   3. Module m1 in the test_looseModuleLayer() method

//      is transitioned to a loose module, access

//      to all unnamed modules is allowed.

//

public class Umod {

 // Create Layers over the boot layer to test different

 // accessing scenarios of a named module to an unnamed module.

 // Module m1 is a strict module and has not established

 // readability to an unnamed module that p2.c2 is defined in.

 public void test_strictModuleLayer() throws Throwable {

     // Define module:     m1

     // Can read:          java.base

     // Packages:          p1

     // Packages exported: p1 is exported unqualifiedly

     ModuleDescriptor descriptor_m1 =

                     .requires("java.base")

                     .exports("p1")

                     .build();

     // Set up a ModuleFinder containing all modules for this layer.

     ModuleFinder finder = ModuleLibrary.of(descriptor_m1);

     // Resolves "m1"

     Configuration cf = Layer.boot()

             .configuration()

             .resolveRequires(finder, ModuleFinder.of(), Set.of("m1"));

     // map module m1 to class loader.

     // class c2 will be loaded in an unnamed module/loader.

     MySameClassLoader loader = new MySameClassLoader();

     Map<String, ClassLoader> map = new HashMap<>();

     map.put("m1", loader);

     // Create Layer that contains m1

     Layer layer = Layer.boot().defineModules(cf, map::get);

     assertTrue(layer.findLoader("m1") == loader);

     assertTrue(layer.findLoader("java.base") == null);

     // now use the same loader to load class p1.c1

     Class p1_c1_class = loader.loadClass("p1.c1");

     // Attempt access

     try {

         p1_c1_class.newInstance();

         throw new RuntimeException("Test Failed, strict module m1, type p1.c1, should not be able " +

                                    "to access public type p2.c2 defined in unnamed module");

     } catch (IllegalAccessError e) {

     }

 }

 // Module m1 is a strict module and has established

 // readability to an unnamed module that p2.c2 is defined in.

 public void test_strictModuleUnnamedReadableLayer() throws Throwable {

     // Define module:     m1

     // Can read:          java.base

     // Packages:          p1

     // Packages exported: p1 is exported unqualifiedly

     ModuleDescriptor descriptor_m1 =

                     .requires("java.base")

                     .exports("p1")

                     .build();

     // Set up a ModuleFinder containing all modules for this layer.

     ModuleFinder finder = ModuleLibrary.of(descriptor_m1);

     // Resolves "m1"

     Configuration cf = Layer.boot()

             .configuration()

             .resolveRequires(finder, ModuleFinder.of(), Set.of("m1"));

     MySameClassLoader loader = new MySameClassLoader();

     // map module m1 to class loader.

     // class c2 will be loaded in an unnamed module/loader.

     Map<String, ClassLoader> map = new HashMap<>();

     map.put("m1", loader);

     // Create Layer that contains m1

     Layer layer = Layer.boot().defineModules(cf, map::get);

     assertTrue(layer.findLoader("m1") == loader);

     assertTrue(layer.findLoader("java.base") == null);

     // now use the same loader to load class p1.c1ReadEdge

     Class p1_c1_class = loader.loadClass("p1.c1ReadEdge");

     try {

       // Read edge between m1 and the unnamed module that loads p2.c2 is established in

       // c1ReadEdge's ctor before attempting access.

       p1_c1_class.newInstance();

     } catch (IllegalAccessError e) {

         throw new RuntimeException("Test Failed, strict module m1, type p1.c1ReadEdge, should be able to acccess public type " +

                                    "p2.c2 defined in unnamed module: " + e.getMessage());

     }

}

 // Module m1 is a loose module and thus can read all unnamed modules.

 public void test_looseModuleLayer() throws Throwable {

     // Define module:     m1

     // Can read:          java.base

     // Packages:          p1

     // Packages exported: p1 is exported unqualifiedly

     ModuleDescriptor descriptor_m1 =

                     .requires("java.base")

                     .exports("p1")

                     .build();

     // Set up a ModuleFinder containing all modules for this layer.

     ModuleFinder finder = ModuleLibrary.of(descriptor_m1);

     // Resolves "m1"

     Configuration cf = Layer.boot()

             .configuration()

             .resolveRequires(finder, ModuleFinder.of(), Set.of("m1"));

     MySameClassLoader loader = new MySameClassLoader();

     // map module m1 to class loader.

     // class c2 will be loaded in an unnamed module/loader.

     Map<String, ClassLoader> map = new HashMap<>();

     map.put("m1", loader);

     // Create Layer that contains m1

     Layer layer = Layer.boot().defineModules(cf, map::get);

     assertTrue(layer.findLoader("m1") == loader);

     assertTrue(layer.findLoader("java.base") == null);

     // now use the same loader to load class p1.c1Loose

     Class p1_c1_class = loader.loadClass("p1.c1Loose");

     // change m1 to read all unnamed modules

     Module m1 = layer.findModule("m1").get();

     jdk.internal.module.Modules.addReadsAllUnnamed(m1);

     try {

         p1_c1_class.newInstance();

     } catch (IllegalAccessError e) {

         throw new RuntimeException("Test Failed, strict module m1, type p1.c1Loose, should be able to acccess public type " +

                                    "p2.c2 defined in unnamed module: " + e.getMessage());

     }

 }

 public static void main(String args[]) throws Throwable {

   Umod test = new Umod();

   test.test_strictModuleLayer();                // access denied

   test.test_strictModuleUnnamedReadableLayer(); // access allowed

   test.test_looseModuleLayer();                 // access allowed

 }

}