/*
* 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.
*/
using System;
using System.Collections.Generic;
namespace Lucene.Net.Util
{
/// A serializable Enum class.
[Serializable]
public abstract class Parameter : IEquatable
{
internal static Dictionary allParameters = new Dictionary();
private readonly string name;
private Parameter()
{
// typesafe enum pattern, no public constructor
}
protected internal Parameter(string name)
{
// typesafe enum pattern, no public constructor
this.name = name;
string key = MakeKey(name);
if (allParameters.ContainsKey(key))
throw new System.ArgumentException("Parameter name " + key + " already used!");
allParameters[key] = this;
}
private string MakeKey(string name)
{
return GetType() + " " + name;
}
public override string ToString()
{
return name;
}
/// Resolves the deserialized instance to the local reference for accurate
/// equals() and == comparisons.
///
///
/// a reference to Parameter as resolved in the local VM
///
/// ObjectStreamException
//protected internal virtual System.Object ReadResolve()
//{
// System.Object par = allParameters[MakeKey(name)];
// if (par == null)
// throw new System.IO.IOException("Unknown parameter value: " + name);
// return par;
//}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
if (ReferenceEquals(this, obj)) return true;
if (obj.GetType() != GetType()) return false;
return Equals((Parameter) obj);
}
public bool Equals(Parameter other)
{
return string.Equals(name, other.name);
}
public override int GetHashCode()
{
return (name != null ? name.GetHashCode() : 0);
}
public static bool operator ==(Parameter left, Parameter right)
{
return Equals(left, right);
}
public static bool operator !=(Parameter left, Parameter right)
{
return !Equals(left, right);
}
}
}