/*
 * Copyright 1999-2006 University of Chicago
 * 
 * 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,
 * 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.dcache.ftp.client;

/**
 * Represents data channel authentication mode.
 * Use static variables SELF or NONE.
 **/
public class DataChannelAuthentication
{

    public static final DataChannelAuthentication NONE =
            new DataChannelAuthentication("N");

    public static final DataChannelAuthentication SELF =
            new DataChannelAuthentication("A");

    protected String argument;

    protected DataChannelAuthentication()
    {
    }

    protected DataChannelAuthentication(String argument)
    {
        this.argument = argument;
    }

    protected void setArgument(String argument)
    {
        this.argument = argument;
    }

    public String toFtpCmdArgument()
    {
        return argument;
    }

    public boolean equals(Object other)
    {
        if (other == this) {
            return true;
        }
        if (other instanceof DataChannelAuthentication) {
            DataChannelAuthentication otherObj =
                    (DataChannelAuthentication) other;
            return (this.argument.equals(otherObj.argument));
        } else {
            return false;
        }
    }

    public int hashCode()
    {
        return (this.argument == null) ? 1 : this.argument.hashCode();
    }

}