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Java 1.6+ Library with tons of utility classes required in all projects

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/**
 * Copyright (C) 2014-2016 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.collection.attr;

import javax.annotation.Nonnull;

import com.helger.commons.annotation.ReturnsImmutableObject;
import com.helger.commons.annotation.ReturnsMutableObject;

/**
 * Base interface for objects having attributes
 *
 * @author Philip Helger
 * @param 
 *        Key type
 * @param 
 *        Value type
 */
@FunctionalInterface
public interface IHasMutableAttributes  extends IHasAttributes 
{
  @Nonnull
  @ReturnsImmutableObject
  default IAttributeContainer  getAttributes ()
  {
    return getMutableAttributes ();
  }

  /**
   * @return The mutable attribute container. Never null.
   */
  @Nonnull
  @ReturnsMutableObject ("design")
  IMutableAttributeContainer  getMutableAttributes ();
}