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/*

 * @test

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

 * @library /testlibrary /test/lib

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

 * @compile myloaders/MyDiffClassLoader.java

 * @compile p2/c2.java

 * @compile p1/c1.java

 * @compile p1/c1ReadEdgeDiffLoader.java

 * @compile p1/c1Loose.java

 * @build DiffCL_Umod

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

 */

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

import java.lang.module.Configuration;

import java.lang.module.ModuleDescriptor;

import java.lang.module.ModuleFinder;

import java.lang.reflect.Layer;

import java.lang.reflect.Module;

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

import myloaders.MyDiffClassLoader;

//

// 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 DiffCL_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 =

             new ModuleDescriptor.Builder("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.empty(), Set.of("m1"));

     MyDiffClassLoader.loader1 = new MyDiffClassLoader();

     MyDiffClassLoader.loader2 = new MyDiffClassLoader();

     // map module m1 to class loader.

     // class c2 will be loaded in an unnamed module/loader2

     // to achieve differing class loaders.

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

     map.put("m1", MyDiffClassLoader.loader1);

     // Create Layer that contains m1

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

     assertTrue(layer.findLoader("m1") == MyDiffClassLoader.loader1);

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

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

     Class p1_c1_class = MyDiffClassLoader.loader1.loadClass("p1.c1");

     // Attempt access

     try {

         p1_c1_class.newInstance();

         throw new RuntimeException("Test Failed, strict module m1 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 =

             new ModuleDescriptor.Builder("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.empty(), Set.of("m1"));

     MyDiffClassLoader.loader1 = new MyDiffClassLoader();

     MyDiffClassLoader.loader2 = new MyDiffClassLoader();

     // map module m1 to class loader.

     // class c2 will be loaded in an unnamed module/loader2

     // to achieve differing class loaders.

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

     map.put("m1", MyDiffClassLoader.loader1);

     // Create Layer that contains m1

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

     assertTrue(layer.findLoader("m1") == MyDiffClassLoader.loader1);

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

     // now use the same loader to load class p1.c1ReadEdgeDiffLoader

     Class p1_c1_class = MyDiffClassLoader.loader1.loadClass("p1.c1ReadEdgeDiffLoader");

     try {

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

        // c1ReadEdgeDiffLoader's ctor before attempting access.

        p1_c1_class.newInstance();

     } catch (IllegalAccessError e) {

         throw new RuntimeException("Test Failed, module m1 has established readability to p2/c2 loader's " +

                                    "unnamed module, access should be allowed: " + 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 =

             new ModuleDescriptor.Builder("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.empty(), Set.of("m1"));

     MyDiffClassLoader.loader1 = new MyDiffClassLoader();

     MyDiffClassLoader.loader2 = new MyDiffClassLoader();

     // map module m1 to class loader.

     // class c2 will be loaded in an unnamed module/loader2

     // to achieve differing class loaders.

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

     map.put("m1", MyDiffClassLoader.loader1);

     // Create Layer that contains m1

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

     assertTrue(layer.findLoader("m1") == MyDiffClassLoader.loader1);

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

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

     Class p1_c1_class = MyDiffClassLoader.loader1.loadClass("p1.c1Loose");

     // change m1 to be a loose module

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

     jdk.internal.module.Modules.addReads(m1, null);

     try {

         p1_c1_class.newInstance();

     } catch (IllegalAccessError e) {

         throw new RuntimeException("Test Failed, loose module m1 should be able to access " +

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

     }

 }

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

   DiffCL_Umod test = new DiffCL_Umod();

   test.test_strictModuleLayer();                // access denied

   test.test_strictModuleUnnamedReadableLayer(); // access allowed

   test.test_looseModuleLayer();                 // access allowed

 }

}