Hi,

I need to be able to apply filter to fullTextSearch query injecting a collection as parameter. Basically something like "IN (1,2,3)" clause in SQL. Is possible to achieve that with a filter?

In case that can't be injected a collection as parameter, is possible to to enable multiple times same filter with different parameter?




I'm supposing that filters are the natural way to make this restriction, what more options I have to apply collection restriction?

Hi,

a filter seems to be a good choice for your usecase. The API to provide a parameter to a FulltextFilter is FullTextFilter setParameter(String name, Object value);.
This means you can pass any object you like as parameter, you just have to cast the parameter in the filter implementation.

--Hardy

Hi Hardy,

Thank you for the answer.

What is the proper way to implement filter for collections?
Maybe using the booleanQuery and add every item into boolean query? If this is the case, what have to be used BooleanClause.Occur.MUST or BooleanClause.Occur.SHOULD?

Hi,

BooleanQuery sounds good. MUST vs SHOULD depends on your usecase.

Hi,

If you are looking for OR then "Should" would work for you.

Thanks

package com.store.filter;

import java.util.List;

import org.apache.lucene.index.Term;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.CachingWrapperFilter;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.QueryWrapperFilter;
import org.apache.lucene.search.TermQuery;
import org.hibernate.search.annotations.Factory;
import org.hibernate.search.annotations.Key;
import org.hibernate.search.filter.FilterKey;
import org.hibernate.search.filter.StandardFilterKey;

/**
* FullTextFilter with multiple ids
*
* @author actolap
*
*/
public class SourceFilter {

private List<Integer> ids;

public List<Integer> getIds() {
return ids;
}

public void setIds(List<Integer> ids) {
this.ids = ids;
}

@Key
public FilterKey getKey() {
StandardFilterKey key = new StandardFilterKey();
key.addParameter(ids);
return key;
}

@Factory
public Filter getFilter() {
BooleanQuery booleanQuery = new BooleanQuery();
TermQuery termQuery = null;
for (Integer id : ids) {
termQuery = new TermQuery(new Term("source.id", id.toString()));
booleanQuery.add(termQuery, BooleanClause.Occur.SHOULD);
}
return new CachingWrapperFilter(new QueryWrapperFilter(booleanQuery));
}
}