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Lucene example source code file (LuceneJUnitDividingSelector.java)

This example Lucene source code file (LuceneJUnitDividingSelector.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

baseextendselector, baseextendselector, buildexception, buildexception, file, io, lucenejunitdividingselector, override, override, parameter, parameter, string

The Lucene LuceneJUnitDividingSelector.java source code

 *  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.
package org.apache.lucene.util;
import java.io.File;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.types.Parameter;
import org.apache.tools.ant.types.selectors.BaseExtendSelector;

/** Divides filesets into equal groups */
public class LuceneJUnitDividingSelector extends BaseExtendSelector {
  private int counter;
  /** Number of total parts to split. */
  private int divisor;
  /** Current part to accept. */
  private int part;

  public void setParameters(Parameter[] pParameters) {
    for (int j = 0; j < pParameters.length; j++) {
      Parameter p = pParameters[j];
      if ("divisor".equalsIgnoreCase(p.getName())) {
        divisor = Integer.parseInt(p.getValue());
      else if ("part".equalsIgnoreCase(p.getName())) {
        part = Integer.parseInt(p.getValue());
      else {
        throw new BuildException("unknown " + p.getName());

  public void verifySettings() {
    if (divisor <= 0 || part <= 0) {
      throw new BuildException("part or divisor not set");
    if (part > divisor) {
      throw new BuildException("part must be <= divisor");

  public boolean isSelected(File dir, String name, File path) {
    counter = counter % divisor + 1;
    return counter == part;

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene LuceneJUnitDividingSelector.java source code file:

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