buggy files form Mockito #21

projects/Mockito/21/org/mockito/internal/creation/instance/ConstructorInstantiator.java

@@ -0,0 +1,45 @@
+package org.mockito.internal.creation.instance;
+
+import java.lang.reflect.Constructor;
+
+public class ConstructorInstantiator implements Instantiator {
+
+    private final Object outerClassInstance;
+
+    public ConstructorInstantiator(Object outerClassInstance) {
+        this.outerClassInstance = outerClassInstance;
+    }
+
+    public <T> T newInstance(Class<T> cls) {
+        if (outerClassInstance == null) {
+            return noArgConstructor(cls);
+        }
+        return withOuterClass(cls);
+    }
+
+    private <T> T withOuterClass(Class<T> cls) {
+        try {
+            //this is kind of overengineered because we don't need to support more params
+            //however, I know we will be needing it :)
+            Constructor<T> c = cls.getDeclaredConstructor(outerClassInstance.getClass());
+            return c.newInstance(outerClassInstance);
+        } catch (Exception e) {
+            throw paramsException(cls, e);
+        }
+    }
+
+    private static <T> InstantationException paramsException(Class<T> cls, Exception e) {
+        return new InstantationException("Unable to create mock instance of '"
+                + cls.getSimpleName() + "'.\nPlease ensure that the outer instance has correct type and that the target class has parameter-less constructor.", e);
+    }
+
+
+    private static <T> T noArgConstructor(Class<T> cls) {
+        try {
+            return cls.newInstance();
+        } catch (Exception e) {
+            throw new InstantationException("Unable to create mock instance of '"
+                    + cls.getSimpleName() + "'.\nPlease ensure it has parameter-less constructor.", e);
+        }
+    }
+}