code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC 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.
  
  package org.openqa.selenium.grid.config;
  
  import java.util.Objects;
  import org.openqa.selenium.internal.Require;
  
  public class Role implements Comparable<Role> {
  
    private final String roleName;
  
    public Role(String roleName) {
      this.roleName = Require.nonNull("Role name", roleName);
    }
  
    public static Role of(String name) {
      return new Role(Require.nonNull("Role name", name));
    }
  
    public String getRoleName() {
      return roleName;
    }
  
    @Override
    public String toString() {
      return roleName;
    }
  
    @Override
    public boolean equals(Object o) {
      if (!(o instanceof Role)) {
        return false;
      }
  
      Role that = (Role) o;
      return Objects.equals(this.roleName, that.roleName);
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(roleName);
    }
  
    @Override
    public int compareTo(Role o) {
      return getRoleName().compareTo(o.getRoleName());
    }
  }
  