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Lucene example source code file (Parameter.java)

This example Lucene source code file (Parameter.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

deprecated, hashmap, illegalargumentexception, io, object, object, objectstreamexception, override, parameter, parameter, serializable, serializable, streamcorruptedexception, string, string, util

The Lucene Parameter.java source code

package org.apache.lucene.util;

 * 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.ObjectStreamException;
import java.io.Serializable;
import java.io.StreamCorruptedException;
import java.util.HashMap;
import java.util.Map;

 * A serializable Enum class.
 * @deprecated Use Java 5 enum, will be removed in a later Lucene 3.x release.
 * @lucene.internal
public abstract class Parameter implements Serializable {
  static Map<String,Parameter> allParameters = new HashMap();
  private String name;
  protected Parameter(String name) {
    // typesafe enum pattern, no public constructor
    this.name = name;
    String key = makeKey(name);
      throw new IllegalArgumentException("Parameter name " + key + " already used!");
    allParameters.put(key, this);
  private String makeKey(String name){
    return getClass() + " " + name;
  public String toString() {
    return name;
   * Resolves the deserialized instance to the local reference for accurate
   * equals() and == comparisons.
   * @return a reference to Parameter as resolved in the local VM
   * @throws ObjectStreamException
  protected Object readResolve() throws ObjectStreamException {
    Object par = allParameters.get(makeKey(name));
    if(par == null)
      throw new StreamCorruptedException("Unknown parameter value: " + name);
    return par;

Other Lucene examples (source code examples)

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

my book on functional programming


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