--- /dev/null
+package org.apache.lucene.util;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+public class TestVirtualMethod extends LuceneTestCase {
+
+ private static final VirtualMethod<TestVirtualMethod> publicTestMethod =
+ new VirtualMethod<TestVirtualMethod>(TestVirtualMethod.class, "publicTest", String.class);
+ private static final VirtualMethod<TestVirtualMethod> protectedTestMethod =
+ new VirtualMethod<TestVirtualMethod>(TestVirtualMethod.class, "protectedTest", int.class);
+
+ public void publicTest(String test) {}
+ protected void protectedTest(int test) {}
+
+ static class TestClass1 extends TestVirtualMethod {
+ @Override
+ public void publicTest(String test) {}
+ @Override
+ protected void protectedTest(int test) {}
+ }
+
+ static class TestClass2 extends TestClass1 {
+ @Override // make it public here
+ public void protectedTest(int test) {}
+ }
+
+ static class TestClass3 extends TestClass2 {
+ @Override
+ public void publicTest(String test) {}
+ }
+
+ static class TestClass4 extends TestVirtualMethod {
+ }
+
+ static class TestClass5 extends TestClass4 {
+ }
+
+ public void testGeneral() {
+ assertEquals(0, publicTestMethod.getImplementationDistance(this.getClass()));
+ assertEquals(1, publicTestMethod.getImplementationDistance(TestClass1.class));
+ assertEquals(1, publicTestMethod.getImplementationDistance(TestClass2.class));
+ assertEquals(3, publicTestMethod.getImplementationDistance(TestClass3.class));
+ assertFalse(publicTestMethod.isOverriddenAsOf(TestClass4.class));
+ assertFalse(publicTestMethod.isOverriddenAsOf(TestClass5.class));
+
+ assertEquals(0, protectedTestMethod.getImplementationDistance(this.getClass()));
+ assertEquals(1, protectedTestMethod.getImplementationDistance(TestClass1.class));
+ assertEquals(2, protectedTestMethod.getImplementationDistance(TestClass2.class));
+ assertEquals(2, protectedTestMethod.getImplementationDistance(TestClass3.class));
+ assertFalse(protectedTestMethod.isOverriddenAsOf(TestClass4.class));
+ assertFalse(protectedTestMethod.isOverriddenAsOf(TestClass5.class));
+
+ assertTrue(VirtualMethod.compareImplementationDistance(TestClass3.class, publicTestMethod, protectedTestMethod) > 0);
+ assertEquals(0, VirtualMethod.compareImplementationDistance(TestClass5.class, publicTestMethod, protectedTestMethod));
+ }
+
+ @SuppressWarnings("unchecked")
+ public void testExceptions() {
+ try {
+ // cast to Class to remove generics:
+ publicTestMethod.getImplementationDistance((Class) LuceneTestCase.class);
+ fail("LuceneTestCase is not a subclass and can never override publicTest(String)");
+ } catch (IllegalArgumentException arg) {
+ // pass
+ }
+
+ try {
+ new VirtualMethod<TestVirtualMethod>(TestVirtualMethod.class, "bogus");
+ fail("Method bogus() does not exist, so IAE should be thrown");
+ } catch (IllegalArgumentException arg) {
+ // pass
+ }
+
+ try {
+ new VirtualMethod<TestClass2>(TestClass2.class, "publicTest", String.class);
+ fail("Method publicTest(String) is not declared in TestClass2, so IAE should be thrown");
+ } catch (IllegalArgumentException arg) {
+ // pass
+ }
+
+ try {
+ // try to create a second instance of the same baseClass / method combination
+ new VirtualMethod<TestVirtualMethod>(TestVirtualMethod.class, "publicTest", String.class);
+ fail("Violating singleton status succeeded");
+ } catch (UnsupportedOperationException arg) {
+ // pass
+ }
+ }
+
+}