| 1 | /* |
| 2 | * Copyright 2013 the original author or authors. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.springframework.data.elasticsearch.core; |
| 17 | |
| 18 | import org.elasticsearch.index.query.BoolQueryBuilder; |
| 19 | import org.elasticsearch.index.query.BoostableQueryBuilder; |
| 20 | import org.elasticsearch.index.query.QueryBuilder; |
| 21 | import org.springframework.data.elasticsearch.core.query.Criteria; |
| 22 | import org.springframework.util.Assert; |
| 23 | |
| 24 | import java.util.Iterator; |
| 25 | import java.util.ListIterator; |
| 26 | |
| 27 | import static org.elasticsearch.index.query.QueryBuilders.*; |
| 28 | import static org.springframework.data.elasticsearch.core.query.Criteria.OperationKey; |
| 29 | |
| 30 | /** |
| 31 | * CriteriaQueryProcessor |
| 32 | * |
| 33 | * @author Rizwan Idrees |
| 34 | * @author Mohsin Husen |
| 35 | */ |
| 36 | class CriteriaQueryProcessor { |
| 37 | |
| 38 | |
| 39 | QueryBuilder createQueryFromCriteria(Criteria criteria) { |
| 40 | BoolQueryBuilder query = boolQuery(); |
| 41 | |
| 42 | ListIterator<Criteria> chainIterator = criteria.getCriteriaChain().listIterator(); |
| 43 | while (chainIterator.hasNext()) { |
| 44 | Criteria chainedCriteria = chainIterator.next(); |
| 45 | if(chainedCriteria.isOr()){ |
| 46 | query.should(createQueryFragmentForCriteria(chainedCriteria)); |
| 47 | }else if(chainedCriteria.isNegating()){ |
| 48 | query.mustNot(createQueryFragmentForCriteria(chainedCriteria)); |
| 49 | }else{ |
| 50 | query.must(createQueryFragmentForCriteria(chainedCriteria)); |
| 51 | } |
| 52 | } |
| 53 | return query; |
| 54 | } |
| 55 | |
| 56 | |
| 57 | private QueryBuilder createQueryFragmentForCriteria(Criteria chainedCriteria) { |
| 58 | Iterator<Criteria.CriteriaEntry> it = chainedCriteria.getCriteriaEntries().iterator(); |
| 59 | boolean singeEntryCriteria = (chainedCriteria.getCriteriaEntries().size() == 1); |
| 60 | |
| 61 | String fieldName = chainedCriteria.getField().getName(); |
| 62 | Assert.notNull(fieldName,"Unknown field"); |
| 63 | QueryBuilder query = null; |
| 64 | |
| 65 | if(singeEntryCriteria){ |
| 66 | Criteria.CriteriaEntry entry = it.next(); |
| 67 | query = processCriteriaEntry(entry.getKey(), entry.getValue(), fieldName); |
| 68 | }else{ |
| 69 | query = boolQuery(); |
| 70 | while (it.hasNext()){ |
| 71 | Criteria.CriteriaEntry entry = it.next(); |
| 72 | ((BoolQueryBuilder)query).must(processCriteriaEntry(entry.getKey(), entry.getValue(), fieldName)); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | addBoost(query, chainedCriteria.getBoost()); |
| 77 | return query; |
| 78 | } |
| 79 | |
| 80 | |
| 81 | private QueryBuilder processCriteriaEntry(OperationKey key, Object value, String fieldName) { |
| 82 | if (value == null) { |
| 83 | return null; |
| 84 | } |
| 85 | QueryBuilder query = null; |
| 86 | |
| 87 | switch (key){ |
| 88 | case EQUALS: |
| 89 | query = fieldQuery(fieldName, value); break; |
| 90 | case CONTAINS: |
| 91 | query = fieldQuery(fieldName,"*" + value + "*").analyzeWildcard(true); break; |
| 92 | case STARTS_WITH: |
| 93 | query = fieldQuery(fieldName,value +"*").analyzeWildcard(true); break; |
| 94 | case ENDS_WITH: |
| 95 | query = fieldQuery(fieldName, "*"+value).analyzeWildcard(true); break; |
| 96 | case EXPRESSION: |
| 97 | query = queryString((String)value).field(fieldName); break; |
| 98 | case BETWEEN: |
| 99 | Object[] ranges = (Object[]) value; |
| 100 | query = rangeQuery(fieldName).from(ranges[0]).to(ranges[1]); break; |
| 101 | case FUZZY: |
| 102 | query = fuzzyQuery(fieldName, (String) value); break; |
| 103 | case IN: |
| 104 | query = boolQuery(); |
| 105 | Iterable<Object> collection = (Iterable<Object>) value; |
| 106 | for(Object item : collection){ |
| 107 | ((BoolQueryBuilder) query).should(fieldQuery(fieldName, item)); |
| 108 | } |
| 109 | break; |
| 110 | } |
| 111 | |
| 112 | return query; |
| 113 | } |
| 114 | |
| 115 | private QueryBuilder buildNegationQuery(String fieldName, Iterator<Criteria.CriteriaEntry> it){ |
| 116 | BoolQueryBuilder notQuery = boolQuery(); |
| 117 | while (it.hasNext()){ |
| 118 | notQuery.mustNot(fieldQuery(fieldName, it.next().getValue())); |
| 119 | } |
| 120 | return notQuery; |
| 121 | } |
| 122 | |
| 123 | private void addBoost(QueryBuilder query, float boost){ |
| 124 | if(Float.isNaN(boost)){ |
| 125 | return; |
| 126 | } |
| 127 | if(query instanceof BoostableQueryBuilder){ |
| 128 | ((BoostableQueryBuilder)query).boost(boost); |
| 129 | } |
| 130 | |
| 131 | } |
| 132 | |
| 133 | |
| 134 | } |