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Java 1.6+ Library with tons of utility classes required in all projects
There is a newer version: 9.5.5
/**
 * 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.state.EChange;

/**
 * This is the writable extension of the {@link IAttributeContainer <String,
 * Object>}. null values are not allowed in this attribute
 * containers.
 *
 * @author Philip Helger
 * @param 
 *        Key type
 */
public interface IMutableAttributeContainerAny  extends IMutableAttributeContainer 
{
  /**
   * Set/overwrite an in attribute value. This is a shortcut for
   * setAttribute (aName, Boolean.valueOf (bValue));
   *
   * @param aName
   *        The name of the attribute. May not be null.
   * @param bValue
   *        The value of the attribute.
   * @return {@link EChange#CHANGED} if something changed,
   *         {@link EChange#UNCHANGED} otherwise.
   * @see IMutableAttributeContainer#removeAttribute(Object)
   */
  @Nonnull
  default EChange setAttribute (@Nonnull final KEYTYPE aName, final boolean bValue)
  {
    return setAttribute (aName, Boolean.valueOf (bValue));
  }

  /**
   * Set/overwrite an in attribute value. This is a shortcut for
   * setAttribute (aName, Integer.valueOf (nValue));
   *
   * @param aName
   *        The name of the attribute. May not be null.
   * @param nValue
   *        The value of the attribute.
   * @return {@link EChange#CHANGED} if something changed,
   *         {@link EChange#UNCHANGED} otherwise.
   * @see IMutableAttributeContainer#removeAttribute(Object)
   */
  @Nonnull
  default EChange setAttribute (@Nonnull final KEYTYPE aName, final int nValue)
  {
    return setAttribute (aName, Integer.valueOf (nValue));
  }

  /**
   * Set/overwrite an in attribute value. This is a shortcut for
   * setAttribute (aName, Long.valueOf (nValue));
   *
   * @param aName
   *        The name of the attribute. May not be null.
   * @param nValue
   *        The value of the attribute.
   * @return {@link EChange#CHANGED} if something changed,
   *         {@link EChange#UNCHANGED} otherwise.
   * @see IMutableAttributeContainer#removeAttribute(Object)
   */
  @Nonnull
  default EChange setAttribute (@Nonnull final KEYTYPE aName, final long nValue)
  {
    return setAttribute (aName, Long.valueOf (nValue));
  }

  /**
   * Set/overwrite an in attribute value. This is a shortcut for
   * setAttribute (aName, Double.valueOf (nValue));
   *
   * @param aName
   *        The name of the attribute. May not be null.
   * @param dValue
   *        The value of the attribute.
   * @return {@link EChange#CHANGED} if something changed,
   *         {@link EChange#UNCHANGED} otherwise.
   * @see IMutableAttributeContainer#removeAttribute(Object)
   */
  @Nonnull
  default EChange setAttribute (@Nonnull final KEYTYPE aName, final double dValue)
  {
    return setAttribute (aName, Double.valueOf (dValue));
  }

  /**
   * Atomic operation to set a flag to true if it was previously
   * set to false (meaning not existing). There is no possibility
   * to define a value for this flag. The value used is {@link Boolean#TRUE}.
   * {@link IMutableAttributeContainer#containsAttribute(Object)} can be used to
   * check if the attribute is already present.
   *
   * @param aName
   *        The name of the flag to set.
   * @return The old value of the flag. If the flag was not present previously,
   *         than false is returned, whereas if the flag was
   *         already present, true is returned. Any other than the
   *         first call for the same flag is always returning true.
   */
  default boolean getAndSetAttributeFlag (@Nonnull final KEYTYPE aName)
  {
    final Object aOldValue = getAttributeObject (aName);
    if (aOldValue != null)
    {
      // Attribute flag is already present
      return true;
    }
    // Attribute flag is not yet present -> set it
    setAttribute (aName, Boolean.TRUE);
    return false;
  }

}