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Lucene example source code file (AbstractQueryMaker.java)

This example Lucene source code file (AbstractQueryMaker.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

abstractquerymaker, config, exception, exception, query, query, querymaker, string, string, stringbuilder, stringbuilder

The Lucene AbstractQueryMaker.java source code

package org.apache.lucene.benchmark.byTask.feeds;
 * Copyright 2005 The Apache Software Foundation
 * Licensed 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 org.apache.lucene.search.Query;
import org.apache.lucene.benchmark.byTask.utils.Config;

 * Abstract base query maker. 
 * Each query maker should just implement the {@link #prepareQueries()} method.
public abstract class AbstractQueryMaker implements QueryMaker {

  protected int qnum = 0;
  protected Query[] queries;
  protected Config config;

  public void resetInputs() {
    qnum = 0;

  protected abstract Query[] prepareQueries() throws Exception;

  public void setConfig(Config config) throws Exception {
    this.config = config;
    queries = prepareQueries();

  public String printQueries() {
    String newline = System.getProperty("line.separator");
    StringBuilder sb = new StringBuilder();
    if (queries != null) {
      for (int i = 0; i < queries.length; i++) {
        sb.append(i+". "+ queries[i].getClass().getSimpleName()+" - "+queries[i].toString());
    return sb.toString();

  public Query makeQuery() throws Exception {
    return queries[nextQnum()];
  // return next qnum
  protected synchronized int nextQnum() {
    int res = qnum;
    qnum = (qnum+1) % queries.length;
    return res;

  *  (non-Javadoc)
  * @see org.apache.lucene.benchmark.byTask.feeds.QueryMaker#makeQuery(int)
  public Query makeQuery(int size) throws Exception {
    throw new Exception(this+".makeQuery(int size) is not supported!");

Other Lucene examples (source code examples)

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