source: vlo/trunk/vlo_web_app/src/main/java/eu/clarin/cmdi/vlo/pages/ShowAllFacetValuesPage.java @ 2768

package eu.clarin.cmdi.vlo.pages;

import java.util.Map;

import org.apache.wicket.PageParameters;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.link.BookmarkablePageLink;
import org.apache.wicket.markup.repeater.RepeatingView;

public class ShowAllFacetValuesPage extends BasePage {

        public static final String SELECTED_FACET_PARAM = "selectedFacet";
        public static final String FACET_MIN_OCCURS = "facetMinOccurs";
        public static final Integer FACET_MIN_OCCURS_VALUE = 2; // for parameter FACET_MIN_OCCURS to show only values that occur with this minimal frequency

        public ShowAllFacetValuesPage(PageParameters parameters) {
                super(parameters);
                final SearchPageQuery query = new SearchPageQuery(parameters);

                // show facets that were already chosen
                addFilteredFacets(query);
                
                // filter for minimal frequency of values
                addOccurrencesFilter(parameters);
                
                String selectedFacet = parameters.getString(SELECTED_FACET_PARAM);
                Integer facetMinOccurs = parameters.getAsInteger(FACET_MIN_OCCURS, 1);
                add(new Label("category", selectedFacet));
                SolrFacetFieldDataProvider data = new SolrFacetFieldDataProvider(selectedFacet, query);
                add(new AlphabeticalPanel("alphaPanel", data, query, facetMinOccurs));
        }
        
        /**
         * Adds a link to allow filtering for minimal occurrences of a value or to show all values again
         * @param parameters
         */
        private void addOccurrencesFilter(PageParameters parameters) {
                PageParameters newParameters = (PageParameters) parameters.clone();
                newParameters.remove(FACET_MIN_OCCURS);
                if(!parameters.containsKey(FACET_MIN_OCCURS) || parameters.getAsInteger(FACET_MIN_OCCURS) == 1) {
                        newParameters.add(FACET_MIN_OCCURS, FACET_MIN_OCCURS_VALUE.toString());
                        add(new BookmarkablePageLink<Void>("filter", ShowAllFacetValuesPage.class, newParameters).add(new Label("filterLabel", "Show only values that occur at least "+FACET_MIN_OCCURS_VALUE+" times")));
                } else {
                        add(new BookmarkablePageLink<Void>("filter", ShowAllFacetValuesPage.class, newParameters).add(new Label("filterLabel", "Show all values")));
                }
        }
        
        /**
         * Add view that shows already selected facets
         * @param query
         */
        private void addFilteredFacets(SearchPageQuery query) {
                Map<String, String> filterQueries = query.getFilterQueryMap();
                RepeatingView filteredFacets = new RepeatingView("filteredFacets");
                if (filterQueries != null && !filterQueries.isEmpty()) {
                        WebMarkupContainer wmc = new WebMarkupContainer(filteredFacets.newChildId());
                        wmc.add(new Label("filteredFacet", "Selected categories:"));
                        filteredFacets.add(wmc);
                        for (String fq : filterQueries.keySet()) {
                                wmc = new WebMarkupContainer(filteredFacets.newChildId());
                                wmc.add(new Label("filteredFacet", fq + " = " + filterQueries.get(fq)));
                                filteredFacets.add(wmc);
                        }
                }
                add(filteredFacets);            
        }
}