Current File : //proc/309157/root/home/waritko/yacy/htroot/yacysearchpagination.java
// yacysearchpagination.java
// ---------------------------
// Copyright 2019 by luccioman; https://github.com/luccioman
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// LICENSE
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
import net.yacy.cora.protocol.RequestHeader;
import net.yacy.http.servlets.TemplateMissingParameterException;
import net.yacy.search.Switchboard;
import net.yacy.search.SwitchboardConstants;
import net.yacy.search.query.QueryParams;
import net.yacy.search.query.SearchEvent;
import net.yacy.search.query.SearchEventCache;
import net.yacy.server.serverObjects;
import net.yacy.server.serverSwitch;
/**
* Render yacysearch results page fragment containing pagination links.
*/
public class yacysearchpagination {
/** The maximum number of pagination links to render */
private static final int MAX_PAGINATION_LINKS = 10;
/**
* @param header servlet request headers
* @param post request parameters
* @param env server environment
* @return the servlet answer object
*/
public static serverObjects respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
if (post == null) {
throw new TemplateMissingParameterException("The eventID parameter is required");
}
final serverObjects prop = new serverObjects();
final Switchboard sb = (Switchboard) env;
final String eventID = post.get("eventID");
if (eventID == null) {
throw new TemplateMissingParameterException("The eventID parameter is required");
}
final boolean jsResort = post.getBoolean("jsResort");
final boolean authFeatures = post.containsKey("auth");
final int defaultItemsPerPage = sb.getConfigInt(SwitchboardConstants.SEARCH_ITEMS, 10);
/* Detailed rules on items per page limits are handle in yacysearch.html */
int itemsPerPage = Math.max(1, post.getInt("maximumRecords", defaultItemsPerPage));
final SearchEvent theSearch = SearchEventCache.getEvent(eventID);
if (theSearch == null) {
/*
* the event does not exist in cache
*/
prop.put("pagination", false);
} else {
prop.put("pagination", true);
final RequestHeader.FileType fileType = header.fileType();
if(jsResort) {
/* Pagination links are processed on browser side : just prepare prev and next buttons */
prop.put("pagination_hidePagination", true);
prop.put("pagination_prevDisabled", true);
prop.put("pagination_pages", 0);
prop.put("pagination_nextDisabled", true);
} else {
final int startRecord = post.getInt("offset", 0);
final int totalCount = theSearch.getResultCount();
final int activePage = (int) Math.floor(startRecord / (double) itemsPerPage);
final int firstLinkedPage = activePage - (activePage % MAX_PAGINATION_LINKS);
final int totalPagesNb = (int) Math.floor(1 + ((totalCount - 1) / (double) itemsPerPage));
final int displayedPagesNb = Math.min(MAX_PAGINATION_LINKS, totalPagesNb - firstLinkedPage);
prop.put("pagination_prevDisabled", activePage == 0);
prop.putUrlEncoded(fileType, "pagination_prevDisabled_prevHref", QueryParams
.navurl(fileType, Math.max(activePage - 1, 0), theSearch.query, null, false, authFeatures).toString());
prop.put("pagination_hidePagination", totalPagesNb <= 1 || displayedPagesNb < 1);
for (int i = 0; i < displayedPagesNb; i++) {
if (activePage == (firstLinkedPage + i)) {
prop.put("pagination_pages_" + i + "_active", true);
} else {
prop.put("pagination_pages_" + i + "_active", false);
prop.put("pagination_pages_" + i + "_active_pageIndex", (firstLinkedPage + i));
prop.putUrlEncoded(fileType, "pagination_pages_" + i + "_active_href",
QueryParams
.navurl(fileType, firstLinkedPage + i, theSearch.query, null, false, authFeatures)
.toString());
}
prop.put("pagination_pages_" + i + "_pageNum", firstLinkedPage + i + 1L);
}
prop.put("pagination_pages", displayedPagesNb);
final boolean localQuery = theSearch.query.isLocal();
if ((localQuery && activePage >= (totalPagesNb - 1))
|| (!localQuery && activePage >= (displayedPagesNb - 1))) {
/*
* Last page on a local query, or last fetchable page in p2p mode : the next
* page button is disabled
*/
prop.put("pagination_nextDisabled", true);
} else {
prop.put("pagination_nextDisabled", false);
prop.putUrlEncoded(fileType, "pagination_nextDisabled_nextHref", QueryParams
.navurl(fileType, activePage + 1, theSearch.query, null, false, authFeatures).toString());
}
}
}
return prop;
}
}
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