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Roles are a powerful way for designing complex behaviours while keeping good practices such as Single Responsibility, Dependency Inversion and Interface Segregation.

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/*
 * #%L
 * *********************************************************************************************************************
 *
 * These Foolish Things - Miscellaneous utilities
 * http://thesefoolishthings.tidalwave.it - git clone [email protected]:tidalwave/thesefoolishthings-src.git
 * %%
 * Copyright (C) 2009 - 2016 Tidalwave s.a.s. (http://tidalwave.it)
 * %%
 * *********************************************************************************************************************
 *
 * 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.
 *
 * *********************************************************************************************************************
 *
 * $Id$
 *
 * *********************************************************************************************************************
 * #L%
 */
package it.tidalwave.role.spi;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import lombok.RequiredArgsConstructor;
import java.io.Serializable;
import it.tidalwave.util.Id;
import it.tidalwave.role.Identifiable;
import lombok.Getter;

/***********************************************************************************************************************
 *
 * A default implementation of {@link Identifiable} which wraps a given id.
 *
 * @author  Fabrizio Giudici
 * @version $Id$
 * @it.tidalwave.javadoc.stable
 *
 **********************************************************************************************************************/
@Immutable @RequiredArgsConstructor
public class DefaultIdentifiable implements Identifiable, Serializable
  {
    private static final long serialVersionUID = 45654634423793043L;

    @Getter @Nonnull
    private final Id id;

    /*******************************************************************************************************************
     *
     * {@inheritDoc}
     *
     ******************************************************************************************************************/
    @Override @Nonnull
    public String toString()
      {
        return String.format("DefaultIdentifiable@%x[%s]", System.identityHashCode(this), id);
      }
  }