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    1   /* Copyright 2004, 2005 Acegi Technology Pty Limited
    2    *
    3    * Licensed under the Apache License, Version 2.0 (the "License");
    4    * you may not use this file except in compliance with the License.
    5    * You may obtain a copy of the License at
    6    *
    7    *     http://www.apache.org/licenses/LICENSE-2.0
    8    *
    9    * Unless required by applicable law or agreed to in writing, software
    10   * distributed under the License is distributed on an "AS IS" BASIS,
    11   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12   * See the License for the specific language governing permissions and
    13   * limitations under the License.
    14   */
    15
    16  package org.acegisecurity.domain.impl;
    17
    18  /***
    19   * A <i>value object</i>, which means a persistable business object  that does
    20   * not have its own persistence identity.
    21   *
    22   * <p>
    23   * Every value object belongs to a single {@link
    24   * org.acegisecurity.domain.impl.AbstractPersistableEntity}. This is
    25   * necessary so that the value object has some sort of persistence
    26   * relationship/ownership.
    27   * </p>
    28   *
    29   * <P>
    30   * In addition, a value object cannot be referenced from more than one
    31   * <code>PersistableEntity</code>. Use a <code>PersistableEntity</code>
    32   * instead of a  <code>PersistableValue</code> if this is a design constraint.
    33   * </p>
    34   *
    35   * @author Ben Alex
    36   * @version $Id: PersistableValue.java,v 1.2 2005/11/17 00:55:49 benalex Exp $
    37   */
    38  public abstract class PersistableValue extends BusinessObject {}