001package ca.uhn.fhir.rest.api;
002
003import static org.apache.commons.lang3.StringUtils.isBlank;
004
005/*
006 * #%L
007 * HAPI FHIR - Core Library
008 * %%
009 * Copyright (C) 2014 - 2017 University Health Network
010 * %%
011 * Licensed under the Apache License, Version 2.0 (the "License");
012 * you may not use this file except in compliance with the License.
013 * You may obtain a copy of the License at
014 * 
015 *      http://www.apache.org/licenses/LICENSE-2.0
016 * 
017 * Unless required by applicable law or agreed to in writing, software
018 * distributed under the License is distributed on an "AS IS" BASIS,
019 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
020 * See the License for the specific language governing permissions and
021 * limitations under the License.
022 * #L%
023 */
024
025import java.util.ArrayList;
026import java.util.StringTokenizer;
027
028import ca.uhn.fhir.context.FhirContext;
029import ca.uhn.fhir.model.api.IQueryParameterOr;
030import ca.uhn.fhir.model.api.IQueryParameterType;
031
032public class QualifiedParamList extends ArrayList<String> {
033
034        private static final long serialVersionUID = 1L;
035
036        private String myQualifier;
037
038        public QualifiedParamList() {
039                super();
040        }
041
042        public QualifiedParamList(int theCapacity) {
043                super(theCapacity);
044        }
045
046        public QualifiedParamList(IQueryParameterOr<?> theNextOr, FhirContext theContext) {
047                for (IQueryParameterType next : theNextOr.getValuesAsQueryTokens()) {
048                        if (myQualifier == null) {
049                                myQualifier = next.getQueryParameterQualifier();
050                        }
051                        add(next.getValueAsQueryToken(theContext));
052                }
053        }
054
055        public String getQualifier() {
056                return myQualifier;
057        }
058
059        public void setQualifier(String theQualifier) {
060                myQualifier = theQualifier;
061        }
062
063        public static QualifiedParamList singleton(String theParamValue) {
064                return singleton(null, theParamValue);
065        }
066
067        public static QualifiedParamList singleton(String theQualifier, String theParamValue) {
068                QualifiedParamList retVal = new QualifiedParamList(1);
069                retVal.setQualifier(theQualifier);
070                retVal.add(theParamValue);
071                return retVal;
072        }
073
074        public static QualifiedParamList splitQueryStringByCommasIgnoreEscape(String theQualifier, String theParams) {
075                QualifiedParamList retVal = new QualifiedParamList();
076                retVal.setQualifier(theQualifier);
077
078                StringTokenizer tok = new StringTokenizer(theParams, ",", true);
079                String prev = null;
080                while (tok.hasMoreElements()) {
081                        String str = tok.nextToken();
082                        if (isBlank(str)) {
083                                prev = null;
084                                continue;
085                        }
086                        
087                        if (str.equals(",")) {
088                                        if (countTrailingSlashes(prev) % 2 == 1) {
089                                                int idx = retVal.size() - 1;
090                                                String existing = retVal.get(idx);
091                                                prev = existing.substring(0, existing.length() - 1) + ',';
092                                                retVal.set(idx, prev);
093                                        } else {
094                                                prev = null;
095                                        }
096                                continue;
097                        }
098
099                        if (prev != null && prev.length() > 0 && prev.charAt(prev.length() - 1) == ',') {
100                                int idx = retVal.size() - 1;
101                                String existing = retVal.get(idx);
102                                prev = existing + str;
103                                retVal.set(idx, prev);
104                        } else {
105                                retVal.add(str);
106                                prev = str;
107                        }
108
109                }
110
111                return retVal;
112        }
113
114        private static int countTrailingSlashes(String theString) {
115                if(theString==null) {
116                        return 0;
117                }
118                int retVal = 0;
119                for (int i = theString.length() - 1; i >= 0; i--) {
120                        char nextChar = theString.charAt(i);
121                        if (nextChar != '\\') {
122                                break;
123                        }
124                        retVal++;
125                }
126                return retVal;
127        }
128
129}