content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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 org.apache.causeway.applib.services.wrapper.events;
  
  import org.apache.causeway.applib.Identifier;
  import org.apache.causeway.applib.services.wrapper.WrapperFactory;
  
  /**
   * Supported only by {@link WrapperFactory},
   * represents a check to determine whether a proposed change is valid.
   * <p>
   * Multiple subclasses, including:
   * <ul>
   * <li>modifying a property</li>
   * <li>adding to/removing from a collection</li>
   * <li>checking a single argument for an action invocation</li>
   * <li>checking all arguments for an action invocation</li>
   * <li>checking all properties for an object before saving</li>
   * </ul>
   * <p>
   * If {@link #getReason()} is <tt>null</tt>, then is usable; otherwise is
   * disabled.
   *
   * @see AccessEvent
   * @see VisibilityEvent
   * @see UsabilityEvent
   * @since 1.x {@index}
   */
  public abstract class ValidityEvent extends InteractionEvent implements ProposedHolderEvent {
  
      public ValidityEvent(final Object source, final Identifier identifier) {
          super(source, identifier);
      }
  
      @Override
      public Object getSource() {
          return super.getSource();
      }
  
      @Override
      public String getReasonMessage() {
          return String.format("Source: %s. %s", this.getSource(), super.getReasonMessage());
      }
  }
  