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1   package ca.uhn.fhir.rest.param.binder;
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 static org.apache.commons.lang3.StringUtils.isBlank;
24  
25  import java.util.Collections;
26  import java.util.List;
27  
28  import ca.uhn.fhir.context.FhirContext;
29  import ca.uhn.fhir.model.api.IQueryParameterOr;
30  import ca.uhn.fhir.rest.api.QualifiedParamList;
31  import ca.uhn.fhir.rest.param.*;
32  import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
33  import ca.uhn.fhir.rest.server.exceptions.InvalidRequestException;
34  
35  abstract class BaseJavaPrimitiveBinder<T>implements IParamBinder<T> {
36  
37  	public BaseJavaPrimitiveBinder() {
38  		super();
39  	}
40  
41  	protected abstract String doEncode(T theString);
42  
43  	protected abstract T doParse(String theString);
44  
45  	@SuppressWarnings("unchecked")
46  	@Override
47  	public List<IQueryParameterOr<?>> encode(FhirContext theContext, T theString) throws InternalErrorException {
48  		String retVal = doEncode(theString);
49  		if (isBlank(retVal)) {
50  			return Collections.emptyList();
51  		}
52  		List<?> retValList = Collections.singletonList(ParameterUtil.singleton(new StringParam(retVal), null));
53  		return (List<IQueryParameterOr<?>>) retValList;
54  	}
55  
56  	@Override
57  	public T parse(FhirContext theContext, String theName, List<QualifiedParamList> theParams) throws InternalErrorException, InvalidRequestException {
58  		if (theParams.size() == 0 || theParams.get(0).size() == 0) {
59  			return null;
60  		}
61  		if (theParams.size() > 1 || theParams.get(0).size() > 1) {
62  			throw new InvalidRequestException("Multiple values detected for non-repeatable parameter '" + theName + "'. This server is not configured to allow multiple (AND) values for this param.");
63  		}
64  	
65  		T value = doParse(theParams.get(0).get(0));
66  		return value;
67  	}
68  
69  }