/*
 * ====================================================================
 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */
package org.apache.http.auth;

import java.io.Serializable;
import java.security.Principal;

import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.util.Args;
import org.apache.http.util.LangUtils;

/**
 * Basic user principal used for HTTP authentication
 *
 * @since 4.0
 */
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public final class BasicUserPrincipal implements Principal, Serializable {

    private static final long serialVersionUID = -2266305184969850467L;

    private final String username;

    public BasicUserPrincipal(final String username) {
        super();
        Args.notNull(username, "User name");
        this.username = username;
    }

    @Override
    public String getName() {
        return this.username;
    }

    @Override
    public int hashCode() {
        int hash = LangUtils.HASH_SEED;
        hash = LangUtils.hashCode(hash, this.username);
        return hash;
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o instanceof BasicUserPrincipal) {
            final BasicUserPrincipal that = (BasicUserPrincipal) o;
            if (LangUtils.equals(this.username, that.username)) {
                return true;
            }
        }
        return false;
    }

    @Override
    public String toString() {
        final StringBuilder buffer = new StringBuilder();
        buffer.append("[principal: ");
        buffer.append(this.username);
        buffer.append("]");
        return buffer.toString();
    }

}