/*
    * 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.chemistry.opencmis.client.runtime.objecttype;
  
  import java.io.Serializable;
  import java.util.List;
  
  import org.apache.chemistry.opencmis.client.api.ItemIterable;
  import org.apache.chemistry.opencmis.client.api.ObjectType;
  import org.apache.chemistry.opencmis.client.api.Session;
  import org.apache.chemistry.opencmis.client.api.Tree;
  
  /**
   * Helper for object types, containing session-related info.
   * <p>
   * This is needed because Java doesn't support multiple inheritance.
   */
  public class ObjectTypeHelper implements Serializable {
  
      private static final long serialVersionUID = 1L;
  
      private final Session session;
      private final ObjectType objectType;
      private ObjectType baseType;
      private ObjectType parentType;
  
      public ObjectTypeHelper(Session session, ObjectType objectType) {
          assert session != null;
          assert objectType != null;
  
          this.session = session;
          this.objectType = objectType;
      }
  
      public Session getSession() {
          return session;
      }
  
      public boolean isBaseType() {
          return objectType.getParentTypeId() == null || objectType.getParentTypeId().length() == 0;
      }
  
      public ObjectType getBaseType() {
          if (isBaseType()) {
              return null;
          }
          if (baseType != null) {
              return baseType;
          }
          if (objectType.getBaseTypeId() == null) {
              return null;
          }
          baseType = session.getTypeDefinition(objectType.getBaseTypeId().value());
          return baseType;
      }
  
      public ObjectType getParentType() {
          if (parentType != null) {
              return parentType;
          }
          if (objectType.getParentTypeId() == null || objectType.getParentTypeId().length() == 0) {
              return null;
          }
          parentType = session.getTypeDefinition(objectType.getParentTypeId());
          return parentType;
      }
  
      public ItemIterable<ObjectType> getChildren() {
          return session.getTypeChildren(objectType.getId(), true);
      }
  
      public List<Tree<ObjectType>> getDescendants(int depth) {
          return session.getTypeDescendants(objectType.getId(), depth, true);
      }
  }