make use and activate autodetect charset in Vocabulary input from file

+ revert mistake of empty cn.lng

htroot/Vocabulary_p.java

@@ -30,6 +30,7 @@ import java.util.Collection;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.regex.Pattern;
@@ -83,7 +84,7 @@ public class Vocabulary_p {
                     final boolean discoverFromAuthor = post.get("discovermethod", "").equals("author");
                     final boolean discoverFromCSV = post.get("discovermethod", "").equals("csv");
                     final String discoverFromCSVPath = post.get("discoverpath", "").replaceAll("%20", " ");
-                    final String discoverFromCSVCharset = post.get("charset", StandardCharsets.UTF_8.name());
+                    String discoverFromCSVCharset = post.get("charset", StandardCharsets.UTF_8.name());
                     final int discovercolumnliteral = post.getInt("discovercolumnliteral", 0);
                     final int discovercolumnsynonyms = post.getInt("discovercolumnsynonyms", -1);
                     final int discovercolumnobjectlink = post.getInt("discovercolumnobjectlink", -1);
@@ -95,7 +96,11 @@ public class Vocabulary_p {
                     if (!discoverNot) {
                         if (discoverFromCSV && discoverFromCSVFile != null && discoverFromCSVFile.exists()) {
                             // auto-detect charset, used code from http://jchardet.sourceforge.net/; see also: http://www-archive.mozilla.org/projects/intl/chardet.html
-                            FileUtils.checkCharset(discoverFromCSVFile, discoverFromCSVCharset, true);
+                            if (discoverFromCSVCharset.equals("autodetect")) {
+                                List<String> charsets = FileUtils.detectCharset(discoverFromCSVFile);
+                                discoverFromCSVCharset = charsets.get(0);
+                                ConcurrentLog.info("FileUtils", "detected charset: " + discoverFromCSVCharset + " used to read " + discoverFromCSVFile.toString());
+                            }
                             // read file
                             BufferedReader r = new BufferedReader(new InputStreamReader(new FileInputStream(discoverFromCSVFile), discoverFromCSVCharset));
                             String line = null;
@@ -304,10 +309,12 @@ public class Vocabulary_p {
         }
 
         // make charset list for import method selector
-        int c = 0;
+        prop.putHTML("create_charset_" + 0 + "_name", "autodetect");
+        prop.put("create_charset_" + 0 + "_selected", 1);
+        int c = 1;
         for (String cs: Charset.availableCharsets().keySet()) {
             prop.putHTML("create_charset_" + c + "_name", cs);
-            prop.put("create_charset_" + c + "_selected", cs.equals("windows-1252") ? 1 : 0);
+            prop.put("create_charset_" + c + "_selected", 0);
             c++;
         }
         prop.put("create_charset", c);

source/net/yacy/kelondro/util/FileUtils.java

@@ -53,7 +53,6 @@ import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.regex.Pattern;
 import java.util.zip.GZIPInputStream;
@@ -935,10 +934,10 @@ public final class FileUtils {
      * used code from http://jchardet.sourceforge.net/;
      * see also: http://www-archive.mozilla.org/projects/intl/chardet.html
      * @param file
-     * @return a set of probable charsets
+     * @return a list of probable charsets
      * @throws IOException
      */
-    public static Set<String> detectCharset(File file) throws IOException {
+    public static List<String> detectCharset(File file) throws IOException {
         // auto-detect charset, used code from http://jchardet.sourceforge.net/; see also: http://www-archive.mozilla.org/projects/intl/chardet.html
         nsDetector det = new nsDetector(nsPSMDetector.ALL);
         BufferedInputStream imp = new BufferedInputStream(new FileInputStream(file));
@@ -953,11 +952,11 @@ public final class FileUtils {
             if (!isAscii && !done) done = det.DoIt(buf,len, false);
         }
         det.DataEnd();
-        Set<String> result = new HashSet<>();
+        List<String> result = new ArrayList<>();
         if (isAscii) {
-            result.add("ASCII");
+            result.add(StandardCharsets.US_ASCII.name());
         } else {
-            for (String c: det.getProbableCharsets()) result.add(c);
+            for (String c: det.getProbableCharsets()) result.add(c); // worst case this returns "nomatch"
         }
 
         return result;
@@ -976,7 +975,7 @@ public final class FileUtils {
             @Override
             public void run() {
                 try {
-                    Set<String> charsets = FileUtils.detectCharset(file);
+                    List<String> charsets = FileUtils.detectCharset(file);
                     if (charsets.contains(givenCharset)) {
                         ConcurrentLog.info("checkCharset", "appropriate charset '" + givenCharset + "' for import of " + file + ", is part one detected " + charsets);
                     } else {