final String[] fields = getParamValueArray(request, "facet.field");
        final String[] queries = getParamValueArray(request, "facet.query");
        if (fields.length == 0 && queries.length == 0) {
            return null;
        }
        final FacetInfo facetInfo = new FacetInfo();
        facetInfo.field = fields;
        facetInfo.query = queries;

    public Integer offset;

    @ValidateTypeFailure
    public Integer pn;

    @ValidateTypeFailure
    public Integer num;

    public String[] lang;

    public Map<String, String[]> fields = new HashMap<>();

    public Map<String, String[]> as = new HashMap<>();

    public String[] ex_q;

    public String sdh;

    @Override
    public String getQuery() {
        return q;
    }

import org.lastaflute.web.util.LaRequestUtil;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

public class SearchForm extends SearchRequestParams {

    public Map<String, String[]> fields = new HashMap<>();

    public Map<String, String[]> as = new HashMap<>();

    @Size(max = 1000)
    public String q;

    @Size(max = 1000)
    public String sort;

    @ValidateTypeFailure

    public String[] hq;

    // for error page

    public String q;

    public String num;

    public String sort;

    public String lang;

    public Map<String, String[]> fields = new HashMap<>();