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Lucene example source code file (RemoteCachingWrapperFilterHelper.java)

This example Lucene source code file (RemoteCachingWrapperFilterHelper.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

cachingwrapperfilterhelper, docidset, filter, filter, first, first, io, ioexception, ioexception, override, remotecachingwrapperfilter, remotecachingwrapperfilterhelper, remotecachingwrapperfilterhelper, we

The Lucene RemoteCachingWrapperFilterHelper.java source code

package org.apache.lucene.search;

 * 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.io.IOException;

import junit.framework.Assert;

import org.apache.lucene.index.IndexReader;

 * A unit test helper class to help with RemoteCachingWrapperFilter testing and
 * assert that it is working correctly.
public class RemoteCachingWrapperFilterHelper extends RemoteCachingWrapperFilter {

  private boolean shouldHaveCache;

  public RemoteCachingWrapperFilterHelper(Filter filter, boolean shouldHaveCache) {
    this.shouldHaveCache = shouldHaveCache;
  public void shouldHaveCache(boolean shouldHaveCache) {
    this.shouldHaveCache = shouldHaveCache;

  public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
    Filter cachedFilter = FilterManager.getInstance().getFilter(filter);
    Assert.assertNotNull("Filter should not be null", cachedFilter);
    if (!shouldHaveCache) {
      Assert.assertSame("First time filter should be the same ", filter, cachedFilter);
    } else {
      Assert.assertNotSame("We should have a cached version of the filter", filter, cachedFilter);
    if (filter instanceof CachingWrapperFilterHelper) {
    return cachedFilter.getDocIdSet(reader);

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