--- /dev/null
+package org.apache.lucene.index;
+
+/**
+ * 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.
+ */
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.Arrays;
+
+import org.apache.lucene.analysis.MockAnalyzer;
+import org.apache.lucene.document.Document;
+import org.apache.lucene.document.Field.Index;
+import org.apache.lucene.document.Field.Store;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.util.LuceneTestCase;
+import org.junit.Test;
+
+public class TestNoDeletionPolicy extends LuceneTestCase {
+
+ @Test
+ public void testNoDeletionPolicy() throws Exception {
+ IndexDeletionPolicy idp = NoDeletionPolicy.INSTANCE;
+ idp.onInit(null);
+ idp.onCommit(null);
+ }
+
+ @Test
+ public void testFinalSingleton() throws Exception {
+ assertTrue(Modifier.isFinal(NoDeletionPolicy.class.getModifiers()));
+ Constructor<?>[] ctors = NoDeletionPolicy.class.getDeclaredConstructors();
+ assertEquals("expected 1 private ctor only: " + Arrays.toString(ctors), 1, ctors.length);
+ assertTrue("that 1 should be private: " + ctors[0], Modifier.isPrivate(ctors[0].getModifiers()));
+ }
+
+ @Test
+ public void testMethodsOverridden() throws Exception {
+ // Ensures that all methods of IndexDeletionPolicy are
+ // overridden/implemented. That's important to ensure that NoDeletionPolicy
+ // overrides everything, so that no unexpected behavior/error occurs.
+ // NOTE: even though IndexDeletionPolicy is an interface today, and so all
+ // methods must be implemented by NoDeletionPolicy, this test is important
+ // in case one day IDP becomes an abstract class.
+ for (Method m : NoDeletionPolicy.class.getMethods()) {
+ // getDeclaredMethods() returns just those methods that are declared on
+ // NoDeletionPolicy. getMethods() returns those that are visible in that
+ // context, including ones from Object. So just filter out Object. If in
+ // the future IndexDeletionPolicy will become a class that extends a
+ // different class than Object, this will need to change.
+ if (m.getDeclaringClass() != Object.class) {
+ assertTrue(m + " is not overridden !", m.getDeclaringClass() == NoDeletionPolicy.class);
+ }
+ }
+ }
+
+ @Test
+ public void testAllCommitsRemain() throws Exception {
+ Directory dir = newDirectory();
+ IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
+ TEST_VERSION_CURRENT, new MockAnalyzer(random))
+ .setIndexDeletionPolicy(NoDeletionPolicy.INSTANCE));
+ for (int i = 0; i < 10; i++) {
+ Document doc = new Document();
+ doc.add(newField("c", "a" + i, Store.YES, Index.ANALYZED));
+ writer.addDocument(doc);
+ writer.commit();
+ assertEquals("wrong number of commits !", i + 1, IndexReader.listCommits(dir).size());
+ }
+ writer.close();
+ dir.close();
+ }
+
+}