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.chemistry.opencmis.commons.data;
  
  import java.util.List;
  
  /**
   * Base property interface.
   */
  public interface PropertyData<T> extends ExtensionsData {
  
      /**
       * Returns the property ID.
       * <p>
       * The property ID may not be set if the object is used in a query result.
       * 
       * 
       * @return the property ID, may be {@code null}
       */
      String getId();
  
      /**
       * Returns the local name.
       * 
       * @return the local name, may be {@code null}
       */
      String getLocalName();
  
      /**
       * Returns the display name.
       * 
       * @return the display name, may be {@code null}
       */
      String getDisplayName();
  
      /**
       * Returns the query name.
       * <p>
       * The property query name must be set if the object is used in a query
       * result.
       * 
       * @return the query name, may be {@code null}
       */
      String getQueryName();
  
      /**
       * Returns the list of values of this property. For a single value property
       * this is a list with one entry.
       * 
       * @return the list of values, not {@code null}
       */
      List<T> getValues();
  
      /**
       * Returns the first entry of the list of values.
       * 
       * @return first entry in the list of values or {@code null} if the list of
       *         values is empty
       */
      T getFirstValue();
  }
  