001package ca.uhn.fhir.rest.param;
002
003/*
004 * #%L
005 * HAPI FHIR - Core Library
006 * %%
007 * Copyright (C) 2014 - 2019 University Health Network
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022import static org.apache.commons.lang3.StringUtils.isBlank;
023
024import java.util.List;
025
026import org.apache.commons.lang3.Validate;
027
028import ca.uhn.fhir.context.ConfigurationException;
029import ca.uhn.fhir.context.FhirContext;
030import ca.uhn.fhir.model.api.IQueryParameterType;
031import ca.uhn.fhir.rest.server.exceptions.InvalidRequestException;
032
033public class CompositeParam<A extends IQueryParameterType, B extends IQueryParameterType> extends BaseParam implements IQueryParameterType {
034
035        private A myLeftType;
036        private B myRightType;
037
038        public CompositeParam(A theLeftInstance, B theRightInstance) {
039                myLeftType = theLeftInstance;
040                myRightType = theRightInstance;
041        }
042
043        public CompositeParam(Class<A> theLeftType, Class<B> theRightType) {
044                Validate.notNull(theLeftType);
045                Validate.notNull(theRightType);
046                try {
047                        myLeftType = theLeftType.newInstance();
048                } catch (InstantiationException e) {
049                        throw new ConfigurationException("Failed to instantiate type: " + myLeftType, e);
050                } catch (IllegalAccessException e) {
051                        throw new ConfigurationException("Failed to instantiate type: " + myLeftType, e);
052                }
053                try {
054                        myRightType = theRightType.newInstance();
055                } catch (InstantiationException e) {
056                        throw new ConfigurationException("Failed to instantiate type: " + myRightType, e);
057                } catch (IllegalAccessException e) {
058                        throw new ConfigurationException("Failed to instantiate type: " + myRightType, e);
059                }
060        }
061
062        @Override
063        String doGetQueryParameterQualifier() {
064                return null;
065        }
066
067        @Override
068        String doGetValueAsQueryToken(FhirContext theContext) {
069                StringBuilder b = new StringBuilder();
070                if (myLeftType != null) {
071                        b.append(myLeftType.getValueAsQueryToken(theContext));
072                }
073                b.append('$');
074                if (myRightType != null) {
075                        b.append(myRightType.getValueAsQueryToken(theContext));
076                }
077                return b.toString();
078        }
079
080        @Override
081        void doSetValueAsQueryToken(FhirContext theContext, String theParamName, String theQualifier, String theValue) {
082                if (isBlank(theValue)) {
083                        myLeftType.setValueAsQueryToken(theContext, theParamName, theQualifier, "");
084                        myRightType.setValueAsQueryToken(theContext, theParamName, theQualifier, "");
085                } else {
086                        List<String> parts = ParameterUtil.splitParameterString(theValue, '$', false);
087                        if (parts.size() > 2) {
088                                throw new InvalidRequestException("Invalid value for composite parameter (only one '$' is valid for this parameter, others must be escaped). Value was: " + theValue);
089                        }
090                        myLeftType.setValueAsQueryToken(theContext, theParamName, theQualifier, parts.get(0));
091                        if (parts.size() > 1) {
092                                myRightType.setValueAsQueryToken(theContext, theParamName, theQualifier, parts.get(1));
093                        }
094                }
095        }
096
097        /**
098         * @return Returns the left value for this parameter (the first of two parameters in this composite)
099         */
100        public A getLeftValue() {
101                return myLeftType;
102        }
103
104        /**
105         * @return Returns the right value for this parameter (the second of two parameters in this composite)
106         */
107        public B getRightValue() {
108                return myRightType;
109        }
110
111}