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/*
 * ====================================================================
 * 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
 * .
 *
 */
package org.apache.http.auth;

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

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

/**
 * Microsoft Windows specific user principal implementation.
 *
 * @since 4.0
 */
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public class NTUserPrincipal implements Principal, Serializable {

    private static final long serialVersionUID = -6870169797924406894L;

    private final String username;
    private final String domain;
    private final String ntname;

    public NTUserPrincipal(
            final String domain,
            final String username) {
        super();
        Args.notNull(username, "User name");
        this.username = username;
        if (domain != null) {
            this.domain = domain.toUpperCase(Locale.ROOT);
        } else {
            this.domain = null;
        }
        if (this.domain != null && !this.domain.isEmpty()) {
            final StringBuilder buffer = new StringBuilder();
            buffer.append(this.domain);
            buffer.append('\\');
            buffer.append(this.username);
            this.ntname = buffer.toString();
        } else {
            this.ntname = this.username;
        }
    }

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

    public String getDomain() {
        return this.domain;
    }

    public String getUsername() {
        return this.username;
    }

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

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

    @Override
    public String toString() {
        return this.ntname;
    }

}