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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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/*
 * *********************************************************************************************************************
 *
 * TheseFoolishThings: Miscellaneous utilities
 * http://tidalwave.it/projects/thesefoolishthings
 *
 * Copyright (C) 2009 - 2023 by 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.
 *
 * *********************************************************************************************************************
 *
 * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
 * git clone https://github.com/tidalwave-it/thesefoolishthings-src
 *
 * *********************************************************************************************************************
 */
package it.tidalwave.role.io;

import javax.annotation.Nonnull;
import java.io.IOException;
import java.io.Writer;

/***********************************************************************************************************************
 *
 * The role of an object that can be written as a stream of characters.
 *
 * @author  Fabrizio Giudici
 * @it.tidalwave.javadoc.stable
 *
 **********************************************************************************************************************/
@FunctionalInterface
public interface TextWritable
  {
    public static final Class _TextWritable_ = TextWritable.class;

    /*******************************************************************************************************************
     *
     * A default implementation which throws {@link IOException} when opening the stream.
     *
     ******************************************************************************************************************/
    public static final TextWritable DEFAULT = new TextWritable()
      {
        @Override @Nonnull
        public Writer openWriter()
          throws IOException
          {
            throw new IOException("Operation not supported");
          }
      };

    /*******************************************************************************************************************
     *
     * Returns a {@link Writer} to write into the object.
     *
     * @return               the {@code Writer}
     * @throws  IOException  if the operation can't be performed
     *
     ******************************************************************************************************************/
    @Nonnull
    public Writer openWriter()
      throws IOException;
  }