Adds theClass(..), noClass(..), should().be(..) and should().notBe(..)

archunit-example/src/main/java/com/tngtech/archunit/example/EvilCoreAccessor.java

@@ -0,0 +1,10 @@
+package com.tngtech.archunit.example;
+
+import com.tngtech.archunit.example.core.VeryCentralCore;
+
+@SuppressWarnings("unused")
+public class EvilCoreAccessor {
+    void iShouldNotAccessCore() {
+        new VeryCentralCore().doCoreStuff();
+    }
+}

archunit-example/src/main/java/com/tngtech/archunit/example/SomeOtherBusinessInterface.java

@@ -0,0 +1,4 @@
+package com.tngtech.archunit.example;
+
+public interface SomeOtherBusinessInterface {
+}

archunit-example/src/main/java/com/tngtech/archunit/example/controller/WronglyAnnotated.java

@@ -1,7 +1,9 @@
 package com.tngtech.archunit.example.controller;
 
 import com.tngtech.archunit.example.MyController;
+import com.tngtech.archunit.example.core.HighSecurity;
 
+@HighSecurity
 @MyController
 public class WronglyAnnotated {
 }

archunit-example/src/main/java/com/tngtech/archunit/example/core/AnotherGoodCoreSatellite.java

@@ -0,0 +1,10 @@
+package com.tngtech.archunit.example.core;
+
+@SuppressWarnings("unused")
+public class AnotherGoodCoreSatellite implements CoreSatellite {
+    VeryCentralCore centralCore;
+
+    void iAlsoMayAccessCore() {
+        centralCore.doCoreStuff();
+    }
+}

archunit-example/src/main/java/com/tngtech/archunit/example/core/CoreSatellite.java

@@ -0,0 +1,4 @@
+package com.tngtech.archunit.example.core;
+
+public interface CoreSatellite {
+}

archunit-example/src/main/java/com/tngtech/archunit/example/core/GoodCoreSatellite.java

@@ -0,0 +1,10 @@
+package com.tngtech.archunit.example.core;
+
+@SuppressWarnings("unused")
+public class GoodCoreSatellite implements CoreSatellite {
+    VeryCentralCore centralCore;
+
+    void iMayAccessCore() {
+        centralCore.doCoreStuff();
+    }
+}

archunit-example/src/main/java/com/tngtech/archunit/example/core/HighSecurity.java

@@ -0,0 +1,9 @@
+package com.tngtech.archunit.example.core;
+
+import java.lang.annotation.Retention;
+
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+@Retention(RUNTIME)
+public @interface HighSecurity {
+}

archunit-example/src/main/java/com/tngtech/archunit/example/core/VeryCentralCore.java

@@ -0,0 +1,17 @@
+package com.tngtech.archunit.example.core;
+
+import com.tngtech.archunit.example.SomeOtherBusinessInterface;
+import com.tngtech.archunit.example.web.AnnotatedController;
+
+@HighSecurity
+@SuppressWarnings("unused")
+public class VeryCentralCore implements SomeOtherBusinessInterface {
+    public static final String DO_CORE_STUFF_METHOD_NAME = "doCoreStuff";
+
+    public void doCoreStuff() {
+    }
+
+    void coreDoingIllegalStuff() {
+        new AnnotatedController();
+    }
+}

archunit-example/src/test/java/com/tngtech/archunit/exampletest/SingleClassTest.java

@@ -0,0 +1,50 @@
+package com.tngtech.archunit.exampletest;
+
+import com.tngtech.archunit.core.domain.JavaClasses;
+import com.tngtech.archunit.core.importer.ClassFileImporter;
+import com.tngtech.archunit.example.ClassViolatingCodingRules;
+import com.tngtech.archunit.example.SomeOtherBusinessInterface;
+import com.tngtech.archunit.example.core.CoreSatellite;
+import com.tngtech.archunit.example.core.HighSecurity;
+import com.tngtech.archunit.example.core.VeryCentralCore;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.classes;
+import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.noClass;
+import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.theClass;
+
+@Category(Example.class)
+public class SingleClassTest {
+    private static final JavaClasses classes = new ClassFileImporter().importPackagesOf(ClassViolatingCodingRules.class);
+
+    @Test
+    public void core_should_only_be_accessed_by_satellites() {
+        theClass(VeryCentralCore.class)
+                .should().onlyBeAccessed().byClassesThat().implement(CoreSatellite.class)
+                .check(classes);
+    }
+
+    @Test
+    public void core_should_only_access_classes_in_core_itself() {
+        noClass(VeryCentralCore.class)
+                .should().accessClassesThat().resideOutsideOfPackages("..core..", "java..")
+                .check(classes);
+    }
+
+    @Test
+    public void the_only_class_with_high_security_is_central_core() {
+        classes()
+                .that().areAnnotatedWith(HighSecurity.class)
+                .should().be(VeryCentralCore.class)
+                .check(classes);
+    }
+
+    @Test
+    public void central_core_should_not_implement_some_business_interface() {
+        classes()
+                .that().implement(SomeOtherBusinessInterface.class)
+                .should().notBe(VeryCentralCore.class)
+                .check(classes);
+    }
+}

archunit-integration-test/src/test/java/com/tngtech/archunit/integration/SingleClassIntegrationTest.java

@@ -0,0 +1,68 @@
+package com.tngtech.archunit.integration;
+
+import com.tngtech.archunit.example.EvilCoreAccessor;
+import com.tngtech.archunit.example.SomeOtherBusinessInterface;
+import com.tngtech.archunit.example.controller.WronglyAnnotated;
+import com.tngtech.archunit.example.core.CoreSatellite;
+import com.tngtech.archunit.example.core.HighSecurity;
+import com.tngtech.archunit.example.core.VeryCentralCore;
+import com.tngtech.archunit.example.web.AnnotatedController;
+import com.tngtech.archunit.exampletest.SingleClassTest;
+import com.tngtech.archunit.junit.ExpectedViolation;
+import org.junit.Rule;
+
+import static com.tngtech.archunit.example.core.VeryCentralCore.DO_CORE_STUFF_METHOD_NAME;
+import static com.tngtech.archunit.junit.ExpectedAccess.callFrom;
+import static com.tngtech.archunit.junit.ExpectedClass.javaClass;
+
+public class SingleClassIntegrationTest extends SingleClassTest {
+    @Rule
+    public final ExpectedViolation expectedViolation = ExpectedViolation.none();
+
+    @Override
+    public void core_should_only_be_accessed_by_satellites() {
+        expectedViolation
+                .ofRule(String.format("the class %s should only be accessed by classes that implement %s",
+                        VeryCentralCore.class.getName(), CoreSatellite.class.getName()))
+                .by(callFrom(EvilCoreAccessor.class, "iShouldNotAccessCore")
+                        .toConstructor(VeryCentralCore.class)
+                        .inLine(8))
+                .by(callFrom(EvilCoreAccessor.class, "iShouldNotAccessCore")
+                        .toMethod(VeryCentralCore.class, DO_CORE_STUFF_METHOD_NAME)
+                        .inLine(8));
+
+        super.core_should_only_be_accessed_by_satellites();
+    }
+
+    @Override
+    public void core_should_only_access_classes_in_core_itself() {
+        expectedViolation
+                .ofRule(String.format("no class %s should access classes that reside outside of packages ['..core..', 'java..']",
+                        VeryCentralCore.class.getName()))
+                .by(callFrom(VeryCentralCore.class, "coreDoingIllegalStuff")
+                        .toConstructor(AnnotatedController.class)
+                        .inLine(15));
+
+        super.core_should_only_access_classes_in_core_itself();
+    }
+
+    @Override
+    public void the_only_class_with_high_security_is_central_core() {
+        expectedViolation
+                .ofRule(String.format("classes that are annotated with @%s should be %s",
+                        HighSecurity.class.getSimpleName(), VeryCentralCore.class.getName()))
+                .by(javaClass(WronglyAnnotated.class).notBeing(VeryCentralCore.class));
+
+        super.the_only_class_with_high_security_is_central_core();
+    }
+
+    @Override
+    public void central_core_should_not_implement_some_business_interface() {
+        expectedViolation
+                .ofRule(String.format("classes that implement %s should not be %s",
+                        SomeOtherBusinessInterface.class.getName(), VeryCentralCore.class.getName()))
+                .by(javaClass(VeryCentralCore.class).being(VeryCentralCore.class));
+
+        super.central_core_should_not_implement_some_business_interface();
+    }
+}

archunit-integration-test/src/test/java/com/tngtech/archunit/junit/ExpectedClass.java

@@ -0,0 +1,29 @@
+package com.tngtech.archunit.junit;
+
+public class ExpectedClass {
+    public static Creator javaClass(Class<?> clazz) {
+        return new Creator(clazz);
+    }
+
+    public static class Creator {
+        private final Class<?> clazz;
+
+        private Creator(Class<?> clazz) {
+            this.clazz = clazz;
+        }
+
+        public ExpectedMessage notBeing(Class<?> desiredClass) {
+            String expectedMessage = String.format(
+                    "class %s is not %s in (%s.java:0)",
+                    clazz.getName(), desiredClass.getName(), clazz.getSimpleName());
+            return new ExpectedMessage(expectedMessage);
+        }
+
+        public ExpectedMessage being(Class<?> desiredClass) {
+            String expectedMessage = String.format(
+                    "class %s is %s in (%s.java:0)",
+                    clazz.getName(), desiredClass.getName(), clazz.getSimpleName());
+            return new ExpectedMessage(expectedMessage);
+        }
+    }
+}

archunit-integration-test/src/test/java/com/tngtech/archunit/junit/ExpectedLocation.java

@@ -14,7 +14,7 @@ private Creator(Class<?> clazz) {
 
         public ExpectedMessage notResidingIn(String packageIdentifier) {
             String expectedMessage = String.format(
-                    "Class %s doesn't reside in a package '%s' in (%s.java:0)",
+                    "class %s doesn't reside in a package '%s' in (%s.java:0)",
                     clazz.getName(), packageIdentifier, clazz.getSimpleName());
             return new ExpectedMessage(expectedMessage);
         }

archunit-integration-test/src/test/java/com/tngtech/archunit/junit/ExpectedViolation.java

@@ -123,7 +123,7 @@ private PackageAssertionCreator(Class<?> clazz) {
         }
 
         public MessageAssertionChain.Link notMatching(String packageIdentifier) {
-            return containsLine("Class %s doesn't reside in a package '%s' in (%s.java:0)",
+            return containsLine("class %s doesn't reside in a package '%s' in (%s.java:0)",
                     clazz.getName(), packageIdentifier, clazz.getSimpleName());
         }
     }

archunit/src/main/java/com/tngtech/archunit/lang/conditions/ArchConditions.java

@@ -65,7 +65,6 @@
 import static com.tngtech.archunit.core.domain.properties.HasName.Predicates.nameMatching;
 import static com.tngtech.archunit.core.domain.properties.HasOwner.Predicates.With.owner;
 import static com.tngtech.archunit.core.domain.properties.HasParameterTypes.Predicates.parameterTypes;
-import static com.tngtech.archunit.lang.conditions.ArchPredicates.be;
 import static com.tngtech.archunit.lang.conditions.ArchPredicates.have;
 import static java.util.Arrays.asList;
 
@@ -276,6 +275,37 @@ private static DescribedPredicate<? super JavaFieldAccess> ownerAndNameAre(Strin
                 .as(ownerName + "." + fieldName);
     }
 
+    @PublicAPI(usage = ACCESS)
+    public static ArchCondition<JavaClass> be(final Class<?> clazz) {
+        return be(clazz.getName());
+    }
+
+    @PublicAPI(usage = ACCESS)
+    public static ArchCondition<JavaClass> notBe(final Class<?> clazz) {
+        return not(be(clazz));
+    }
+
+    @PublicAPI(usage = ACCESS)
+    public static ArchCondition<JavaClass> be(final String className) {
+        return new ArchCondition<JavaClass>("be " + className) {
+            @Override
+            public void check(JavaClass javaClass, ConditionEvents events) {
+                boolean itemEquivalentToClazz = javaClass.getName().equals(className);
+                String message = String.format("class %s %s %s in %s",
+                        javaClass.getName(),
+                        itemEquivalentToClazz ? "is" : "is not",
+                        className,
+                        formatLocation(javaClass, 0));
+                events.add(new SimpleConditionEvent(javaClass, itemEquivalentToClazz, message));
+            }
+        };
+    }
+
+    @PublicAPI(usage = ACCESS)
+    public static ArchCondition<JavaClass> notBe(final String className) {
+        return not(be(className));
+    }
+
     @PublicAPI(usage = ACCESS)
     public static ArchCondition<JavaClass> haveFullyQualifiedName(final String name) {
         final DescribedPredicate<HasName> haveFullyQualifiedName = have(fullyQualifiedName(name));
@@ -442,7 +472,7 @@ private static ArchCondition<JavaClass> residesConditionForPredicate(final Descr
             @Override
             public void check(JavaClass item, ConditionEvents events) {
                 boolean satisfied = resideInAPackage.apply(item);
-                String message = String.format("Class %s %s %s in %s",
+                String message = String.format("class %s %s %s in %s",
                         item.getName(),
                         satisfied ? "does" : "doesn't",
                         resideInAPackage.getDescription(),
@@ -578,7 +608,7 @@ public static ArchCondition<JavaClass> notBeMetaAnnotatedWith(DescribedPredicate
     }
 
     private static ArchCondition<JavaClass> createAnnotatedCondition(final DescribedPredicate<CanBeAnnotated> annotatedWith) {
-        return new ArchCondition<JavaClass>(be(annotatedWith).getDescription()) {
+        return new ArchCondition<JavaClass>(ArchPredicates.be(annotatedWith).getDescription()) {
             @Override
             public void check(JavaClass item, ConditionEvents events) {
                 boolean satisfied = annotatedWith.apply(item);
@@ -720,7 +750,7 @@ public static ArchCondition<JavaClass> notBeInterfaces() {
     }
 
     private static ArchCondition<JavaClass> createAssignableCondition(final DescribedPredicate<JavaClass> assignable) {
-        return new ArchCondition<JavaClass>(be(assignable).getDescription()) {
+        return new ArchCondition<JavaClass>(ArchPredicates.be(assignable).getDescription()) {
             @Override
             public void check(JavaClass item, ConditionEvents events) {
                 boolean satisfied = assignable.apply(item);