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