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.core.metamodel.util.snapshot;
  
  import org.w3c.dom.Element;
  
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  
  /**
   * Represents a place in the graph to be navigated; really just wraps an object
   * and an XML Element in its XML document. Also provides the capability to
   * extract the corresponding XSD element (associated with each XML element).
   *
   * The XML element (its children) is mutated as the graph of objects is
   * navigated.
   */
  final class Place {
      private static final String USER_DATA_XSD_KEY = "XSD";
      private final ManagedObject object;
      private final Element element;
  
      Place(final ManagedObject object, final Element element) {
          this.object = object;
          this.element = element;
      }
  
      public Element getXmlElement() {
          return element;
      }
  
      public ManagedObject getObject() {
          return object;
      }
  
      public Element getXsdElement() {
          final Object o = element.getUserData(USER_DATA_XSD_KEY);
          if (o == null || !(o instanceof Element)) {
              return null;
          }
          return (Element) o;
      }
  
      // TODO: smelly; where should this responsibility lie?
      static void setXsdElement(final Element element, final Element xsElement) {
          element.setUserData(USER_DATA_XSD_KEY, xsElement, null);
      }
  
  }
  