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Java 1.8+ Library with tons of utility classes required in all projects

There is a newer version: 11.1.10

/*
 * Copyright (C) 2014-2022 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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.
 */
package com.helger.commons.io;

import java.io.Writer;

import javax.annotation.Nullable;

import com.helger.commons.io.stream.StreamHelper;

/**
 * A callback interface to retrieve {@link Writer} objects.
 *
 * @author Philip Helger
 */
@FunctionalInterface
public interface IHasWriter
{
  /**
   * Get the writer to write to an object. Each time this method is call, a new
   * {@link Writer} needs to be created!
   *
   * @return null if resolving failed.
   */
  @Nullable
  Writer getWriter ();

  /**
   * Get a buffered writer to write to an object. Each time this method is call,
   * a new {@link Writer} needs to be created!
   *
   * @return null if resolving failed.
   * @since 9.1.8
   */
  @Nullable
  default Writer getBufferedWriter ()
  {
    final Writer aWriter = getWriter ();
    return aWriter == null ? null : StreamHelper.getBuffered (aWriter);
  }
}