Lucene example source code file (TestNoMergePolicy.java)

This example Lucene source code file (TestNoMergePolicy.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, constructor, exception, exception, lucenetestcase, mergepolicy, method, reflection, test, test, testnomergepolicy, testnomergepolicy, util

The Lucene TestNoMergePolicy.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,
 * 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.util.LuceneTestCase;
import org.junit.Test;

public class TestNoMergePolicy extends LuceneTestCase {

  @Test
  public void testNoMergePolicy() throws Exception {
    MergePolicy mp = NoMergePolicy.NO_COMPOUND_FILES;
    assertNull(mp.findMerges(null));
    assertNull(mp.findMergesForOptimize(null, 0, null));
    assertNull(mp.findMergesToExpungeDeletes(null));
    assertFalse(mp.useCompoundFile(null, null));
    mp.close();
  }

  @Test
  public void testCompoundFiles() throws Exception {
    assertFalse(NoMergePolicy.NO_COMPOUND_FILES.useCompoundFile(null, null));
    assertTrue(NoMergePolicy.COMPOUND_FILES.useCompoundFile(null, null));
  }

  @Test
  public void testFinalSingleton() throws Exception {
    assertTrue(Modifier.isFinal(NoMergePolicy.class.getModifiers()));
    Constructor<?>[] ctors = NoMergePolicy.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 MergePolicy are overridden. That's important
    // to ensure that NoMergePolicy overrides everything, so that no unexpected
    // behavior/error occurs
    for (Method m : NoMergePolicy.class.getMethods()) {
      // getDeclaredMethods() returns just those methods that are declared on
      // NoMergePolicy. getMethods() returns those that are visible in that
      // context, including ones from Object. So just filter out Object. If in
      // the future MergePolicy will extend a different class than Object, this
      // will need to change.
      if (m.getDeclaringClass() != Object.class) {
        assertTrue(m + " is not overridden !", m.getDeclaringClass() == NoMergePolicy.class);
      }
    }
  }

}