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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 java.lang.reflect.Constructor;
24  import java.util.List;
25  
26  import ca.uhn.fhir.context.ConfigurationException;
27  import ca.uhn.fhir.model.api.IQueryParameterType;
28  import ca.uhn.fhir.rest.param.CompositeParam;
29  import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
30  
31  class BaseBinder<T> {
32  	private List<Class<? extends IQueryParameterType>> myCompositeTypes;
33  	private Constructor<? extends T> myConstructor;
34  	private final Class<? extends T> myType;
35  
36  	public BaseBinder(Class<? extends T> theType, List<Class<? extends IQueryParameterType>> theCompositeTypes) {
37  		myType = theType;
38  		myCompositeTypes = theCompositeTypes;
39  		
40  		
41  		if (myType.equals(CompositeParam.class)) {
42  			if (myCompositeTypes.size() != 2) {
43  				throw new ConfigurationException("Search parameter of type " + myType.getName() + " must have 2 composite types declared in parameter annotation, found " + theCompositeTypes.size());
44  			}
45  		}
46  		
47  		try {
48  			Class<?>[] types = new Class<?>[myCompositeTypes.size()];
49  			for (int i = 0; i < myCompositeTypes.size(); i++) {
50  				types[i] = Class.class;
51  			}
52  			myConstructor = myType.getConstructor(types);
53  		} catch (NoSuchMethodException e) {
54  			throw new ConfigurationException("Query parameter type " + theType.getName() + " has no constructor with types " + theCompositeTypes);
55  		}
56  	}
57  
58  	public T newInstance() {
59  		try {
60  			final Object[] args = new Object[myCompositeTypes.size()];
61  			for (int i = 0; i < myCompositeTypes.size();i++) {
62  				args[i] = myCompositeTypes.get(i);//.newInstance();
63  			}
64  			
65  			T dt = myConstructor.newInstance(args);
66  			return dt;
67  		} catch (final Exception e) {
68  			throw new InternalErrorException(e);
69  		}
70  	}
71  
72  }