1
package org.apache.lucene.util;
4
* Licensed to the Apache Software Foundation (ASF) under one or more
5
* contributor license agreements. See the NOTICE file distributed with
6
* this work for additional information regarding copyright ownership.
7
* The ASF licenses this file to You under the Apache License, Version 2.0
8
* (the "License"); you may not use this file except in compliance with
9
* the License. You may obtain a copy of the License at
11
* http://www.apache.org/licenses/LICENSE-2.0
13
* Unless required by applicable law or agreed to in writing, software
14
* distributed under the License is distributed on an "AS IS" BASIS,
15
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16
* See the License for the specific language governing permissions and
17
* limitations under the License.
20
import java.io.ObjectStreamException;
21
import java.io.Serializable;
22
import java.io.StreamCorruptedException;
23
import java.util.HashMap;
27
* A serializable Enum class.
28
* @deprecated Use Java 5 enum, will be removed in a later Lucene 3.x release.
32
@SuppressWarnings("serial")
33
public abstract class Parameter implements Serializable {
34
static Map<String,Parameter> allParameters = new HashMap<String,Parameter>();
38
protected Parameter(String name) {
39
// typesafe enum pattern, no public constructor
41
String key = makeKey(name);
43
if(allParameters.containsKey(key))
44
throw new IllegalArgumentException("Parameter name " + key + " already used!");
46
allParameters.put(key, this);
49
private String makeKey(String name){
50
return getClass() + " " + name;
54
public String toString() {
59
* Resolves the deserialized instance to the local reference for accurate
60
* equals() and == comparisons.
62
* @return a reference to Parameter as resolved in the local VM
63
* @throws ObjectStreamException
65
protected Object readResolve() throws ObjectStreamException {
66
Object par = allParameters.get(makeKey(name));
69
throw new StreamCorruptedException("Unknown parameter value: " + name);