Added server side columns sorting on the Process Scheduler table

For easier usage of large tables in the Table_API_p.html page.

htroot/Table_API_p.html

@@ -63,9 +63,9 @@ To see a list of all APIs, please visit the <a href="http://www.yacy-websuche.de
       <span id="resCounter" style="display: inline;">
       #(navigation)#
       ::
-      #(left)#<img src="env/grafics/navdl.gif" alt="no previous page" />::<a href="Table_API_p.html?startRecord=#[startRecord]#&amp;maximumRecords=#[maximumRecords]#&amp;inline=#(inline)#false::true#(/inline)#&amp;filter=#[filter]#&amp;query=#[query]#" target="_self"><img src="env/grafics/navsl.gif" alt="previous page" /></a>#(/left)#
+      #(left)#<img src="env/grafics/navdl.gif" alt="no previous page" />::<a href="Table_API_p.html?startRecord=#[startRecord]#&amp;maximumRecords=#[maximumRecords]#&amp;inline=#(inline)#false::true#(/inline)#&amp;filter=#[filter]#&amp;query=#[query]#&amp;sort=#[sort]#" target="_self"><img src="env/grafics/navsl.gif" alt="previous page" /></a>#(/left)#
       #[startRecord]#-#[to]# of #[of]#
-      #(right)#<img src="env/grafics/navdr.gif" alt="no next page" />::<a href="Table_API_p.html?startRecord=#[startRecord]#&amp;maximumRecords=#[maximumRecords]#&amp;inline=#(inline)#false::true#(/inline)#&amp;filter=#[filter]#&amp;query=#[query]#" target="_self"><img src="env/grafics/navsr.gif" alt="next page" /></a>#(/right)#
+      #(right)#<img src="env/grafics/navdr.gif" alt="no next page" />::<a href="Table_API_p.html?startRecord=#[startRecord]#&amp;maximumRecords=#[maximumRecords]#&amp;inline=#(inline)#false::true#(/inline)#&amp;filter=#[filter]#&amp;query=#[query]#&amp;sort=#[sort]#" target="_self"><img src="env/grafics/navsr.gif" alt="next page" /></a>#(/right)#
       <img src="env/grafics/nave.gif" alt="" />
       #(/navigation)#
 
@@ -73,23 +73,43 @@ To see a list of all APIs, please visit the <a href="http://www.yacy-websuche.de
       <input type="hidden" name="maximumRecords" value="#[maximumRecords]#" />
       <input type="hidden" name="inline" value="#(inline)#false::true#(/inline)#" />
       <input type="hidden" name="filter" value="#[filter]#" />
+      <input type="hidden" name="sort" value="#[sort]#" />
       <input type="text" name="query" value="#[query]#" onchange="resetStartRecord()" style="font-size:16px;float:left;border:0px;height:20px;background-image:url('env/grafics/find.gif');background-repeat:no-repeat;background-position:right top;"/>
 
       </span>
       <br/>
       <div style="clear:both;">
-      <table class="sortable" style="border:0px; padding:2px; border-spacing:1px">
+      <table style="border:0px; padding:2px; border-spacing:1px" role="grid">
         <tr class="TableHeader" valign="bottom">
           <th class="sorttable_nosort"><input type="checkbox" id="allswitch" onclick="checkAll(this.form.id, this.checked);" /></th>
-          <th>Type</th>
+          <th #(sortedByType)#::aria-sort="#(asc)#descending::ascending#(/asc)#"#(/sortedByType)#>
-          <th style="width: 100%;">Comment</th>
+          	<a class="sortTableLink" href="Table_API_p.html?startRecord=#[startRecord]#&amp;maximumRecords=#[maximumRecords]#&amp;sort=#(nextSortTypeDesc)#::-#(/nextSortTypeDesc)#type&amp;inline=#(inline)#false::true#(/inline)#&amp;filter=#[filter]#&amp;query=#[query]#" target="_self" title="Sort by #(nextSortTypeDesc)#ascending::descending#(/nextSortTypeDesc)# types">Type</a>
-          <th>Call<br/>Count</th>
+          	#(sortedByType)#::<span class="glyphicon glyphicon-chevron-#(asc)#down::up#(/asc)#"></span>#(/sortedByType)#
-          <th>Recording<br/>Date</th>
+          </th>
-          <th>Last&nbsp;Exec<br/>Date</th>
+          <th style="width: 100%;" #(sortedByComment)#::aria-sort="#(asc)#descending::ascending#(/asc)#"#(/sortedByComment)#>
-          <th>Next&nbsp;Exec<br/>Date#(hasEditableNextExecDate)#:: <button type="submit" name="submitNextExecDates" class="btn btn-default btn-xs" title="Apply edited next execution dates">
+          	<a class="sortTableLink" href="Table_API_p.html?startRecord=#[startRecord]#&amp;maximumRecords=#[maximumRecords]#&amp;sort=#(nextSortCommentDesc)#::-#(/nextSortCommentDesc)#comment&amp;inline=#(inline)#false::true#(/inline)#&amp;filter=#[filter]#&amp;query=#[query]#" target="_self" title="Sort by #(nextSortCommentDesc)#ascending::descending#(/nextSortCommentDesc)# comments">Comment</a>
+          	#(sortedByComment)#::<span class="glyphicon glyphicon-chevron-#(asc)#down::up#(/asc)#"></span>#(/sortedByComment)#
+          </th>
+          <th #(sortedByApiCallCount)#::aria-sort="#(asc)#descending::ascending#(/asc)#"#(/sortedByApiCallCount)#>
+          	<a class="sortTableLink" href="Table_API_p.html?startRecord=#[startRecord]#&amp;maximumRecords=#[maximumRecords]#&amp;sort=#(nextSortApiCallCountDesc)#::-#(/nextSortApiCallCountDesc)#apicall_count&amp;inline=#(inline)#false::true#(/inline)#&amp;filter=#[filter]#&amp;query=#[query]#" target="_self" title="Sort by #(nextSortApiCallCountDesc)#ascending::descending#(/nextSortApiCallCountDesc)# call counts">Call Count</a>
+          	#(sortedByApiCallCount)#::<span class="glyphicon glyphicon-chevron-#(asc)#down::up#(/asc)#"></span>#(/sortedByApiCallCount)#
+          </th>
+          <th #(sortedByDateRecording)#::aria-sort="#(asc)#descending::ascending#(/asc)#"#(/sortedByDateRecording)#>
+          	<a class="sortTableLink" href="Table_API_p.html?startRecord=#[startRecord]#&amp;maximumRecords=#[maximumRecords]#&amp;sort=#(nextSortDateRecordingDesc)#::-#(/nextSortDateRecordingDesc)#date_recording&amp;inline=#(inline)#false::true#(/inline)#&amp;filter=#[filter]#&amp;query=#[query]#" target="_self" title="Sort by #(nextSortDateRecordingDesc)#ascending::descending#(/nextSortDateRecordingDesc)# recording dates">Recording&nbsp;Date</a>
+          	#(sortedByDateRecording)#::<span class="glyphicon glyphicon-chevron-#(asc)#down::up#(/asc)#"></span>#(/sortedByDateRecording)#
+          </th>
+          <th #(sortedByDateLastExec)#::aria-sort="#(asc)#descending::ascending#(/asc)#"#(/sortedByDateLastExec)#>
+          	<a class="sortTableLink" href="Table_API_p.html?startRecord=#[startRecord]#&amp;maximumRecords=#[maximumRecords]#&amp;sort=#(nextSortDateLastExecDesc)#::-#(/nextSortDateLastExecDesc)#date_last_exec&amp;inline=#(inline)#false::true#(/inline)#&amp;filter=#[filter]#&amp;query=#[query]#" target="_self" title="Sort by #(nextSortDateLastExecDesc)#ascending::descending#(/nextSortDateLastExecDesc)# last execution dates">Last&nbsp;Exec&nbsp;Date</a>
+          	#(sortedByDateLastExec)#::<span class="glyphicon glyphicon-chevron-#(asc)#down::up#(/asc)#"></span>#(/sortedByDateLastExec)#
+          </th>
+          <th #(sortedByDateNextExec)#::aria-sort="#(asc)#descending::ascending#(/asc)#"#(/sortedByDateNextExec)#>
+          	<a class="sortTableLink" href="Table_API_p.html?startRecord=#[startRecord]#&amp;maximumRecords=#[maximumRecords]#&amp;sort=#(nextSortDateNextExecDesc)#::-#(/nextSortDateNextExecDesc)#date_next_exec&amp;inline=#(inline)#false::true#(/inline)#&amp;filter=#[filter]#&amp;query=#[query]#" target="_self" title="Sort by #(nextSortDateNextExecDesc)#ascending::descending#(/nextSortDateNextExecDesc)# last execution dates">Next&nbsp;Exec&nbsp;Date</a>
+          	#(sortedByDateNextExec)#::<span class="glyphicon glyphicon-chevron-#(asc)#down::up#(/asc)#"></span>#(/sortedByDateNextExec)#
+          	#(hasEditableNextExecDate)#:: <button type="submit" name="submitNextExecDates" class="btn btn-default btn-xs" title="Apply edited next execution dates">
           		<span class="glyphicon glyphicon-ok"></span>
 				<span> Apply</span>
-          	</button>#(/hasEditableNextExecDate)#
+          	</button>
+          	#(/hasEditableNextExecDate)#
           </th>
           <th class="sorttable_nosort">Event Trigger</th>
           <th class="sorttable_nosort">Scheduler</th>

htroot/Table_API_p.java

@@ -44,6 +44,7 @@ import net.yacy.data.TransactionManager;
 import net.yacy.data.WorkTables;
 import net.yacy.kelondro.blob.Tables;
 import net.yacy.kelondro.blob.Tables.Row;
+import net.yacy.kelondro.blob.Tables.SortDirection;
 import net.yacy.search.Switchboard;
 import net.yacy.search.SwitchboardConstants;
 import net.yacy.search.query.QueryParams;
@@ -87,6 +88,21 @@ public class Table_API_p {
             typefilter = Pattern.compile(post.get("filter", ".*"));
         }
         
+        /* Applying JSON API convention for the sort parameter format (http://jsonapi.org/format/#fetching-sorting) */
+        String sortParam = WorkTables.TABLE_API_COL_DATE_RECORDING;
+        if(post != null) {
+        	sortParam = post.get("sort", WorkTables.TABLE_API_COL_DATE_RECORDING).trim();
+        }
+        final SortDirection sortDir;
+        final String sortColumn;
+        if(sortParam.startsWith("-")) {
+        	sortColumn = sortParam.substring(1);
+        	sortDir = SortDirection.DESC;
+        } else {
+        	sortColumn = sortParam;
+        	sortDir = SortDirection.ASC;
+        }
+
         // process scheduler and event input actions
         boolean scheduleeventaction = false; // flag if schedule info of row changes
         String current_pk = ""; // pk of changed schedule data row
@@ -311,6 +327,8 @@ public class Table_API_p {
         prop.put(TransactionManager.TRANSACTION_TOKEN_PARAM, nextTransactionToken);
         prop.put("showtable_" + TransactionManager.TRANSACTION_TOKEN_PARAM, nextTransactionToken);
         
+        final Date now = new Date();
+
         // insert rows
         final List<Tables.Row> table = new ArrayList<Tables.Row>(maximumRecords);
         int count = 0;
@@ -319,7 +337,22 @@ public class Table_API_p {
         try {
             tablesize = sb.tables.size(WorkTables.TABLE_API_NAME);
             final Iterator<Tables.Row> plainIterator = sb.tables.iterator(WorkTables.TABLE_API_NAME);
-            final Iterator<Tables.Row> mapIterator = Tables.orderBy(plainIterator, -1, WorkTables.TABLE_API_COL_DATE_RECORDING).iterator();
+			final Iterator<Tables.Row> mapIterator;
+			if(sortColumn.isEmpty()) {
+				mapIterator = plainIterator;
+			} else {
+				if (WorkTables.TABLE_API_COL_APICALL_COUNT.equals(sortColumn)
+						|| WorkTables.TABLE_API_COL_APICALL_SCHEDULE_TIME.equals(sortColumn)) {
+					mapIterator = Tables.orderByInt(plainIterator, sortColumn, 0, sortDir).iterator();
+				} else if (WorkTables.TABLE_API_COL_DATE.equals(sortColumn)
+						|| WorkTables.TABLE_API_COL_DATE_RECORDING.equals(sortColumn)
+						|| WorkTables.TABLE_API_COL_DATE_LAST_EXEC.equals(sortColumn)
+						|| WorkTables.TABLE_API_COL_DATE_NEXT_EXEC.equals(sortColumn)) {
+					mapIterator = Tables.orderByDate(plainIterator, sortColumn, now, sortDir).iterator();
+				} else {
+					mapIterator = Tables.orderByString(plainIterator, sortColumn, "", sortDir).iterator();
+				}
+			}
             Tables.Row r;
             boolean dark = true;
             boolean scheduledactions = false;
@@ -380,7 +413,6 @@ public class Table_API_p {
             // then work on the list
             for (final Tables.Row row : table) {
             	final String rowPKStr = UTF8.String(row.getPK());
-                final Date now = new Date();
                 final Date date = row.containsKey(WorkTables.TABLE_API_COL_DATE) ? row.get(WorkTables.TABLE_API_COL_DATE, now) : null;
                 final Date date_recording = row.get(WorkTables.TABLE_API_COL_DATE_RECORDING, date);
                 final Date date_last_exec = row.get(WorkTables.TABLE_API_COL_DATE_LAST_EXEC, date);
@@ -536,6 +568,10 @@ public class Table_API_p {
         prop.put("showtable_inline", (inline) ? 1 : 0);
         prop.put("showtable_filter", typefilter.pattern());
         prop.put("showtable_query", queryParam);
+        prop.put("showtable_sort", sortParam);
+        
+        putTableSortProperties(prop, sortDir, sortColumn);
+		
         if (filteredSize > maximumRecords) {
             prop.put("showtable_navigation", 1);
             prop.put("showtable_navigation_startRecord", startRecord);
@@ -547,6 +583,7 @@ public class Table_API_p {
             prop.put("showtable_navigation_left_inline", (inline) ? 1 : 0);
             prop.put("showtable_navigation_left_filter", typefilter.pattern());
             prop.put("showtable_navigation_left_query", queryParam);
+            prop.put("showtable_navigation_left_sort", sortParam);
             prop.put("showtable_navigation_left", startRecord == 0 ? 0 : 1);
             prop.put("showtable_navigation_filter", typefilter.pattern());
             prop.put("showtable_navigation_right", startRecord + maximumRecords >= filteredSize ? 0 : 1);
@@ -555,6 +592,7 @@ public class Table_API_p {
             prop.put("showtable_navigation_right_inline", (inline) ? 1 : 0);
             prop.put("showtable_navigation_right_filter", typefilter.pattern());
             prop.put("showtable_navigation_right_query", queryParam);
+            prop.put("showtable_navigation_right_sort", sortParam);
         } else {
             prop.put("showtable_navigation", 0);
         }
@@ -562,4 +600,47 @@ public class Table_API_p {
         // return rewrite properties
         return prop;
     }
+
+	/**
+	 * Fill the serverObjects instance with table columns sort properties.
+	 * 
+	 * @param prop
+	 *            the serverObjects instance to fill. Must not be null.
+	 * @param sortDir
+	 *            the current sort direction
+	 * @param sortColumn
+	 *            the current sort column
+	 */
+	private static void putTableSortProperties(final serverObjects prop, final SortDirection sortDir,
+			final String sortColumn) {
+		boolean sortedByAsc = WorkTables.TABLE_API_COL_TYPE.equals(sortColumn) && sortDir == SortDirection.ASC;
+		prop.put("showtable_sortedByType", WorkTables.TABLE_API_COL_TYPE.equals(sortColumn));
+		prop.put("showtable_sortedByType_asc", sortedByAsc);
+		prop.put("showtable_nextSortTypeDesc", sortedByAsc);
+
+		sortedByAsc = WorkTables.TABLE_API_COL_COMMENT.equals(sortColumn) && sortDir == SortDirection.ASC;
+		prop.put("showtable_sortedByComment", WorkTables.TABLE_API_COL_COMMENT.equals(sortColumn));
+		prop.put("showtable_sortedByComment_asc", sortedByAsc);
+		prop.put("showtable_nextSortCommentDesc", sortedByAsc);
+
+		sortedByAsc = WorkTables.TABLE_API_COL_APICALL_COUNT.equals(sortColumn) && sortDir == SortDirection.ASC;
+		prop.put("showtable_sortedByApiCallCount", WorkTables.TABLE_API_COL_APICALL_COUNT.equals(sortColumn));
+		prop.put("showtable_sortedByApiCallCount_asc", sortedByAsc);
+		prop.put("showtable_nextSortApiCallCountDesc", sortedByAsc);
+
+		sortedByAsc = WorkTables.TABLE_API_COL_DATE_RECORDING.equals(sortColumn) && sortDir == SortDirection.ASC;
+		prop.put("showtable_sortedByDateRecording", WorkTables.TABLE_API_COL_DATE_RECORDING.equals(sortColumn));
+		prop.put("showtable_sortedByDateRecording_asc", sortedByAsc);
+		prop.put("showtable_nextSortDateRecordingDesc", sortedByAsc);
+
+		sortedByAsc = WorkTables.TABLE_API_COL_DATE_LAST_EXEC.equals(sortColumn) && sortDir == SortDirection.ASC;
+		prop.put("showtable_sortedByDateLastExec", WorkTables.TABLE_API_COL_DATE_LAST_EXEC.equals(sortColumn));
+		prop.put("showtable_sortedByDateLastExec_asc", sortedByAsc);
+		prop.put("showtable_nextSortDateLastExecDesc", sortedByAsc);
+
+		sortedByAsc = WorkTables.TABLE_API_COL_DATE_NEXT_EXEC.equals(sortColumn) && sortDir == SortDirection.ASC;
+		prop.put("showtable_sortedByDateNextExec", WorkTables.TABLE_API_COL_DATE_NEXT_EXEC.equals(sortColumn));
+		prop.put("showtable_sortedByDateNextExec_asc", sortedByAsc);
+		prop.put("showtable_nextSortDateNextExecDesc", sortedByAsc);
+	}
 }

htroot/env/base.css

@@ -15,7 +15,7 @@
 ## "global classes"                          ##
 # i.e. ".strong"; ".left"; ".error";
 ###############################################
-## "privat classes"                          ##
+## "private classes"                          ##
 # all HTML-elements with a specific class
 # i.e. "div.content"; "span.left";
 # and
@@ -607,6 +607,12 @@ a.thumblink {
   overflow: hidden;
 }
 
+/* Link in a table header that triggers server-side table sorting */
+a.sortTableLink, a.sortTableLink:link, a.sortTableLink:visited, a.sortTableLink:hover {
+	text-decoration: none; 
+	color: white;
+}
+
 /*----------
 <em>
 */

locales/de.lng

@@ -3294,13 +3294,12 @@ to a scheduler for a periodic execution.==einem Scheduler für periodische Ausf
 "next page"=="Keine nächste Seite"
 "previous page"=="Keine vorherige Seite"
  of #[of]#== von #[of]#
->Date==>Datum
 >Type==>Typ
 >Comment==>Kommentar
-Call<br/>Count<==Aufruf<br/>Zähler<
+Call Count<==Aufruf Zähler<
-Recording<==Aufzeichnungs<
+Recording&nbsp;Date==Aufzeichnungs&nbsp;Datum
-Last&nbsp;Exec==Letzte&nbsp;Ausführung
+Last&nbsp;Exec&nbsp;Date==Letzte&nbsp;Ausführung&nbsp;Datum
-Next&nbsp;Exec==Nächste&nbsp;Ausführung
+Next&nbsp;Exec&nbsp;Date==Nächste&nbsp;Ausführung&nbsp;Datum
 #>URL<==>URL<
 >Event Trigger<==>Ereignis Auslöser<
 "clone"=="Ereignis klonen"

locales/it.lng

@@ -1215,7 +1215,7 @@ YaCy Supporters<==Sostenitori di YaCy<
 "next page"=="pagina successiva"
 "previous page"=="pagina precedente"
 # of #[of]#== su #[of]#
->Date==>Data
+&nbsp;Date==&nbsp;Data
 >URL<==>URL<
 "clone"=="clona"
 >Scheduler<==>Schedulatore<

locales/master.lng.xlf

@@ -8765,9 +8765,6 @@
     <trans-unit id="1449865e" xml:space="preserve" approved="no" translate="yes">
        <source> of #[of]#</source>
     </trans-unit>
-    <trans-unit id="38a150c" xml:space="preserve" approved="no" translate="yes">
-       <source>&gt;Date</source>
-    </trans-unit>
     <trans-unit id="391b498" xml:space="preserve" approved="no" translate="yes">
        <source>&gt;Type</source>
     </trans-unit>
@@ -8775,16 +8772,16 @@
        <source>&gt;Comment</source>
     </trans-unit>
     <trans-unit id="c2a0ac2a" xml:space="preserve" approved="no" translate="yes">
-       <source>Call&lt;br/&gt;Count&lt;</source>
+       <source>Call Count&lt;</source>
     </trans-unit>
     <trans-unit id="a2a91c8b" xml:space="preserve" approved="no" translate="yes">
-       <source>Recording&lt;</source>
+       <source>Recording&amp;nbsp;Date</source>
     </trans-unit>
     <trans-unit id="9c5940cb" xml:space="preserve" approved="no" translate="yes">
-       <source>Last&amp;nbsp;Exec</source>
+       <source>Last&amp;nbsp;Exec&amp;nbsp;Date</source>
     </trans-unit>
     <trans-unit id="409928e8" xml:space="preserve" approved="no" translate="yes">
-       <source>Next&amp;nbsp;Exec</source>
+       <source>Next&amp;nbsp;Exec&amp;nbsp;Date</source>
     </trans-unit>
     <trans-unit id="2ef20848" xml:space="preserve" approved="no" translate="yes">
        <source>&gt;Event Trigger&lt;</source>

locales/ru.lng

@@ -3444,13 +3444,12 @@ to a scheduler for a periodic execution.==в планировщик для пе
 "next page"=="следующая страница"
 "previous page"=="предыдущая страница"
  of #[of]#== по #[of]#
->Date==>Дата
 >Type==>Тип
 >Comment==>Комментарий
-Call<br/>Count<==Количество<br/>вызовов<
+Call Count<==Количество вызовов<
-Recording<==Запись<
+Recording&nbsp;Date==Запись&nbsp;Дата
-Last&nbsp;Exec==Дата&nbsp;последнего запуска
+Last&nbsp;Exec&nbsp;Date==Дата&nbsp;последнего запуска&nbsp;Дата
-Next&nbsp;Exec==Дата&nbsp;следующего запуска
+Next&nbsp;Exec&nbsp;Date==Дата&nbsp;следующего запуска&nbsp;Дата
 #>URL<==>URL-адрес<
 >Event Trigger<==>Триггер событий<
 "clone"=="клонировать"

locales/uk.lng

@@ -2993,10 +2993,10 @@ to a scheduler for a periodic execution.==для періодичного сам
  of #[of]#== з #[of]#
 >Type==>Тип
 >Comment==>Примітка
-Call<br/>Count<==Виклики<
+Call Count<==Виклики<
->Recording<br/>Date<==>Дата<br/>запису<
+>Recording&nbsp;Date<==>Дата&nbsp;запису<
->Last&nbsp;Exec<br/>Date<==>Останній<br/>запуск<
+>Last&nbsp;Exec&nbsp;Date<==>Останній&nbsp;запуск<
->Next&nbsp;Exec<br/>Date<==>Наступний<br/>запуск<
+>Next&nbsp;Exec&nbsp;Date<==>Наступний&nbsp;запуск<
 >Scheduler<==>Планувальник<
 >no repetition<==>без повторення<
 >activate scheduler<==>з плануванням<

locales/zh.lng

@@ -3307,13 +3307,12 @@ to a scheduler for a periodic execution.==或者用于周期执行一系列动
 "next page"=="下一页"
 "previous page"=="上一页"
  of #[of]#== 共 #[of]#
->Date==>日期
 >Type==>类型
 >Comment==>注释
-Call<br/>Count<==调用<br/>次数<
+Call Count<==调用 次数<
-Recording<==正在记录<
+Recording&nbsp;Date==正在记录&nbsp;日期
-Last&nbsp;Exec==上次&nbsp;执行
+Last&nbsp;Exec&nbsp;Date==上次&nbsp;执行&nbsp;日期
-Next&nbsp;Exec==下次&nbsp;执行
+Next&nbsp;Exec&nbsp;Date==下次&nbsp;执行&nbsp;日期
 >Scheduler<==>定时器<
 #>URL<==>URL
 >no repetition<==>无安排<

source/net/yacy/kelondro/blob/Tables.java

@@ -33,6 +33,7 @@ import java.text.ParseException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.Comparator;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -40,7 +41,6 @@ import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Set;
-import java.util.TreeMap;
 import java.util.TreeSet;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.regex.Pattern;
@@ -481,20 +481,138 @@ public class Tables implements Iterable<String> {
         return new OrderedRowIterator(table, wherePattern, up);
     }
     
-    public static Collection<Row> orderBy(final Iterator<Row> rowIterator, int maxcount, final String sortColumn) {
+	/**
-        final TreeMap<String, Row> sortTree = new TreeMap<String, Row>();
+	 * @param rowIterator
-        Row row;
+	 *            an open iterator on a table. Must not be null.
-        byte[] r;
+	 * @param sortColumn
-        while ((maxcount < 0 || maxcount-- > 0) && rowIterator.hasNext()) {
+	 *            the name of the column to use for sorting.
-            row = rowIterator.next();
+	 * @return all the rows of the table sorted in ascending order on the given
-            r = row.get(sortColumn);
+	 *         column name
-            if (r == null) {
+	 */
-                sortTree.put("0000" + UTF8.String(row.pk), row);
+	public static Collection<Row> orderBy(final Iterator<Row> rowIterator, final String sortColumn) {
-            } else {
+		return orderByString(rowIterator, sortColumn, "", SortDirection.ASC);
-                sortTree.put(UTF8.String(r) + UTF8.String(row.pk), row);
+	}
+    
+	/**
+	 * @param rowIterator
+	 *            an open iterator on a table. Must not be null.
+	 * @param sortColumn
+	 *            the name of the column to use for sorting.
+	 * @param defaultValue
+	 *            the default value to use when the column value is null.
+	 * @param sortDir
+	 *            the sorting direction. When null, {@link SortDirection#ASC} is applied.
+	 * @return all the rows of the table sorted on the given column name
+	 */
+	public static Collection<Row> orderByInt(final Iterator<Row> rowIterator, final String sortColumn,
+			final int defaultValue, final SortDirection sortDir) {
+		/* Compare first on the given column */
+		Comparator<Row> comparator = Comparator.<Row>comparingInt(row -> row.get(sortColumn, defaultValue));
+		/*
+		 * Then in case of equality, compare on the primary key. Ensure also that
+		 * eventual null rows do not make the process fail.
+		 */
+		comparator = Comparator.nullsFirst(comparator.thenComparing(row -> UTF8.String(row.pk)));
+		if (sortDir == SortDirection.DESC) {
+			comparator = comparator.reversed();
+		}
+		return orderBy(rowIterator, comparator);
+	}
+	
+	/**
+	 * @param rowIterator
+	 *            an open iterator on a table. Must not be null.
+	 * @param sortColumn
+	 *            the name of the column to use for sorting.
+	 * @param defaultValue
+	 *            the default value to use when the column value is null.
+	 * @param sortDir
+	 *            the sorting direction. When null, {@link SortDirection#ASC} is applied.
+	 * @return all the rows of the table sorted on the given column name
+	 */
+	public static Collection<Row> orderByLong(final Iterator<Row> rowIterator, final String sortColumn,
+			final long defaultValue, final SortDirection sortDir) {
+		/* Compare first on the given column */
+		Comparator<Row> comparator = Comparator.<Row>comparingLong(row -> row.get(sortColumn, defaultValue));
+		/*
+		 * Then in case of equality, compare on the primary key. Ensure also that
+		 * eventual null rows do not make the process fail.
+		 */
+		comparator = Comparator.nullsFirst(comparator.thenComparing(row -> UTF8.String(row.pk)));
+		if (sortDir == SortDirection.DESC) {
+			comparator = comparator.reversed();
+		}
+		return orderBy(rowIterator, comparator);
+	}
+
+	/**
+	 * @param rowIterator
+	 *            an open iterator on a table. Must not be null.
+	 * @param sortColumn
+	 *            the name of the column to use for sorting.
+	 * @param defaultValue
+	 *            the default value to use when the column value is null.
+	 * @param sortDir
+	 *            the sorting direction. When null, {@link SortDirection#ASC} is applied.
+	 * @return all the rows of the table sorted on the given column name
+	 */
+	public static Collection<Row> orderByString(final Iterator<Row> rowIterator, final String sortColumn,
+			final String defaultValue, final SortDirection sortDir) {
+		/* Compare first on the given column */
+		Comparator<Row> comparator = Comparator
+				.nullsFirst(Comparator.<Row, String>comparing(row -> row.get(sortColumn, defaultValue)));
+		/*
+		 * Then in case of equality, compare on the primary key. Ensure also that
+		 * eventual null rows do not make the process fail.
+		 */
+		comparator = Comparator.nullsFirst(comparator.thenComparing(row -> UTF8.String(row.pk)));
+		if (sortDir == SortDirection.DESC) {
+			comparator = comparator.reversed();
+		}
+		return orderBy(rowIterator, comparator);
+	}
+	
+	/**
+	 * @param rowIterator
+	 *            an open iterator on a table. Must not be null.
+	 * @param sortColumn
+	 *            the name of the column to use for sorting.
+	 * @param defaultValue
+	 *            the default value to use when the column value is null.
+	 * @param sortDir
+	 *            the sorting direction. When null, {@link SortDirection#ASC} is applied.
+	 * @return all the rows of the table sorted on the given column name
+	 */
+	public static Collection<Row> orderByDate(final Iterator<Row> rowIterator, final String sortColumn,
+			final Date defaultValue, final SortDirection sortDir) {
+		/* Compare first on the given column */
+		Comparator<Row> comparator = Comparator
+				.nullsFirst(Comparator.<Row, Date>comparing(row -> row.get(sortColumn, defaultValue)));
+		/*
+		 * Then in case of equality, compare on the primary key. Ensure also that
+		 * eventual null rows do not make the process fail.
+		 */
+		comparator = Comparator.nullsFirst(comparator.thenComparing(row -> UTF8.String(row.pk)));
+		if (sortDir == SortDirection.DESC) {
+			comparator = comparator.reversed();
 		}
+		return orderBy(rowIterator, comparator);
+	}
+	
+	/**
+	 * @param rowIterator
+	 *            an open iterator on a table. Must not be null.
+	 * @param comparator
+	 *            the eventual comparator to use.
+	 * @return all the rows of the table sorted using the given comparator, or
+	 *         sorted on rows natural order when comparator is null.
+	 */
+	public static Collection<Row> orderBy(final Iterator<Row> rowIterator, final Comparator<Row> comparator) {
+		final TreeSet<Row> sortTree = new TreeSet<Row>(comparator);
+		while (rowIterator.hasNext()) {
+			sortTree.add(rowIterator.next());
 		}
-        return sortTree.values();
+		return sortTree;
 	}
 
     public ArrayList<String> columns(final String table) throws IOException {
@@ -502,6 +620,14 @@ public class Tables implements Iterable<String> {
         return heap.columns();
     }
     
+    /** Sort direction for ordering rows */
+    public enum SortDirection {
+    	/** Ascending order */
+    	ASC,
+    	/** Descending order */
+    	DESC
+    }
+
     public class HeapRowIterator extends LookAheadIterator<Row> implements Iterator<Row> {
 
         private final String whereColumn;

source/net/yacy/search/Switchboard.java

@@ -188,6 +188,7 @@ import net.yacy.http.YaCyHttpServer;
 import net.yacy.kelondro.blob.ArrayStack;
 import net.yacy.kelondro.blob.BEncodedHeap;
 import net.yacy.kelondro.blob.Tables;
+import net.yacy.kelondro.blob.Tables.SortDirection;
 import net.yacy.kelondro.data.meta.URIMetadataNode;
 import net.yacy.kelondro.data.word.Word;
 import net.yacy.kelondro.logging.GuiHandler;
@@ -2495,7 +2496,7 @@ public final class Switchboard extends serverSwitch {
         final Date now = new Date();
         try {
             final Iterator<Tables.Row> plainIterator = this.tables.iterator(WorkTables.TABLE_API_NAME);
-            final Iterator<Tables.Row> mapIterator = Tables.orderBy(plainIterator, -1, WorkTables.TABLE_API_COL_DATE_LAST_EXEC).iterator();
+            final Iterator<Tables.Row> mapIterator = Tables.orderByDate(plainIterator, WorkTables.TABLE_API_COL_DATE_LAST_EXEC, null, SortDirection.ASC).iterator();
             while (mapIterator.hasNext()) {
                 row = mapIterator.next();
                 if (row == null) continue;