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Lucene example source code file (TestNoDeletionPolicy.java)

This example Lucene source code file (TestNoDeletionPolicy.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

constructor, directory, document, document, exception, exception, indexwriter, indexwriter, method, mockanalyzer, reflection, test, test, test_version_current, testnodeletionpolicy, util

The Lucene TestNoDeletionPolicy.java source code

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,
 * 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 {

  public void testNoDeletionPolicy() throws Exception {
    IndexDeletionPolicy idp = NoDeletionPolicy.INSTANCE;

  public void testFinalSingleton() throws Exception {
    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()));

  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);

  public void testAllCommitsRemain() throws Exception {
    Directory dir = newDirectory();
    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random))
    for (int i = 0; i < 10; i++) {
      Document doc = new Document();
      doc.add(newField("c", "a" + i, Store.YES, Index.ANALYZED));
      assertEquals("wrong number of commits !", i + 1, IndexReader.listCommits(dir).size());

Other Lucene examples (source code examples)

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