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1   package ca.uhn.fhir.rest.gclient;
2   
3   /*
4    * #%L
5    * HAPI FHIR - Core Library
6    * %%
7    * Copyright (C) 2014 - 2018 University Health Network
8    * %%
9    * Licensed under the Apache License, Version 2.0 (the "License");
10   * you may not use this file except in compliance with the License.
11   * You may obtain a copy of the License at
12   * 
13   *      http://www.apache.org/licenses/LICENSE-2.0
14   * 
15   * Unless required by applicable law or agreed to in writing, software
16   * distributed under the License is distributed on an "AS IS" BASIS,
17   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18   * See the License for the specific language governing permissions and
19   * limitations under the License.
20   * #L%
21   */
22  
23  import org.hl7.fhir.instance.model.api.IBaseResource;
24  
25  import ca.uhn.fhir.rest.server.exceptions.NotModifiedException;
26  
27  public interface IReadIfNoneMatch<T extends IBaseResource> {
28  
29  	/**
30  	 * If the server responds with an <code>HTTP 301 Not Modified</code>,
31  	 * return the given instance.
32  	 */
33  	IReadExecutable<T> returnResource(T theInstance);
34  	
35  	/**
36  	 * If the server responds with an <code>HTTP 301 Not Modified</code>,
37  	 * return <code>null</code>.
38  	 */
39  	IReadExecutable<T> returnNull();
40  	
41  	/**
42  	 * If the server responds with an <code>HTTP 301 Not Modified</code>,
43  	 * throw a {@link NotModifiedException}.
44  	 */
45  	IReadExecutable<T> throwNotModifiedException();
46  	
47  }