/*
* Copyright 2013 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.elasticsearch.core;
import static org.elasticsearch.index.query.QueryBuilders.*;
import static org.springframework.data.elasticsearch.core.query.Criteria.*;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import org.apache.lucene.queryparser.flexible.core.util.StringUtils;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.BoostableQueryBuilder;
import org.elasticsearch.index.query.QueryBuilder;
import org.springframework.data.elasticsearch.core.query.Criteria;
import org.springframework.util.Assert;
/**
* CriteriaQueryProcessor
*
* @author Rizwan Idrees
* @author Mohsin Husen
* @author Franck Marchand
*/
class CriteriaQueryProcessor {
QueryBuilder createQueryFromCriteria(Criteria criteria) {
if (criteria == null)
return null;
List<QueryBuilder> shouldQueryBuilderList = new LinkedList<QueryBuilder>();
List<QueryBuilder> mustNotQueryBuilderList = new LinkedList<QueryBuilder>();
List<QueryBuilder> mustQueryBuilderList = new LinkedList<QueryBuilder>();
ListIterator<Criteria> chainIterator = criteria.getCriteriaChain().listIterator();
while (chainIterator.hasNext()) {
Criteria chainedCriteria = chainIterator.next();
QueryBuilder queryFragmentForCriteria = createQueryFragmentForCriteria(chainedCriteria);
if (queryFragmentForCriteria != null) {
if (chainedCriteria.isOr()) {
shouldQueryBuilderList.add(queryFragmentForCriteria);
} else if (chainedCriteria.isNegating()) {
mustNotQueryBuilderList.add(queryFragmentForCriteria);
} else {
mustQueryBuilderList.add(queryFragmentForCriteria);
}
}
}
BoolQueryBuilder query = null;
if (!shouldQueryBuilderList.isEmpty() || !mustNotQueryBuilderList.isEmpty() || !mustQueryBuilderList.isEmpty()) {
query = boolQuery();
for (QueryBuilder qb : shouldQueryBuilderList) {
query.should(qb);
}
for (QueryBuilder qb : mustNotQueryBuilderList) {
query.mustNot(qb);
}
for (QueryBuilder qb : mustQueryBuilderList) {
query.must(qb);
}
}
return query;
}
private QueryBuilder createQueryFragmentForCriteria(Criteria chainedCriteria) {
if (chainedCriteria.getQueryCriteriaEntries().isEmpty())
return null;
Iterator<Criteria.CriteriaEntry> it = chainedCriteria.getQueryCriteriaEntries().iterator();
boolean singeEntryCriteria = (chainedCriteria.getQueryCriteriaEntries().size() == 1);
String fieldName = chainedCriteria.getField().getName();
Assert.notNull(fieldName, "Unknown field");
QueryBuilder query = null;
if (singeEntryCriteria) {
Criteria.CriteriaEntry entry = it.next();
query = processCriteriaEntry(entry.getKey(), entry.getValue(), fieldName);
} else {
query = boolQuery();
while (it.hasNext()) {
Criteria.CriteriaEntry entry = it.next();
((BoolQueryBuilder) query).must(processCriteriaEntry(entry.getKey(), entry.getValue(), fieldName));
}
}
addBoost(query, chainedCriteria.getBoost());
return query;
}
private QueryBuilder processCriteriaEntry(OperationKey key, Object value, String fieldName) {
if (value == null) {
return null;
}
QueryBuilder query = null;
String searchText = StringUtils.toString(value);
switch (key) {
case EQUALS:
query = queryString(searchText).field(fieldName);
break;
case CONTAINS:
query = queryString("*" + searchText + "*").field(fieldName).analyzeWildcard(true);
break;
case STARTS_WITH:
query = queryString(searchText + "*").field(fieldName).analyzeWildcard(true);
break;
case ENDS_WITH:
query = queryString("*" + searchText).field(fieldName).analyzeWildcard(true);
break;
case EXPRESSION:
query = queryString((String) value).field(fieldName);
break;
case BETWEEN:
Object[] ranges = (Object[]) value;
query = rangeQuery(fieldName).from(ranges[0]).to(ranges[1]);
break;
case FUZZY:
query = fuzzyQuery(fieldName, (String) value);
break;
case IN:
query = boolQuery();
Iterable<Object> collection = (Iterable<Object>) value;
for (Object item : collection) {
((BoolQueryBuilder) query).should(queryString((String) item).field(fieldName));
}
break;
}
return query;
}
private void addBoost(QueryBuilder query, float boost) {
if (Float.isNaN(boost)) {
return;
}
if (query instanceof BoostableQueryBuilder) {
((BoostableQueryBuilder) query).boost(boost);
}
}
}