--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-backend/src/main/java/org/dive4elements/river/importer/parsers/AtFileParser.java	Thu Apr 25 11:53:11 2013 +0200
@@ -0,0 +1,222 @@
+package de.intevation.flys.importer.parsers;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.InputStreamReader;
+import java.io.IOException;
+import java.math.BigDecimal;
+
+import org.apache.log4j.Logger;
+
+import de.intevation.flys.importer.ImportDischargeTable;
+import de.intevation.flys.importer.ImportDischargeTableValue;
+
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
+
+import java.util.Date;
+import java.util.Calendar;
+
+import de.intevation.flys.importer.ImportTimeInterval;
+
+/** Parse *.at (Abflusstafeln?) files. */
+public class AtFileParser {
+
+    public static final String ENCODING = "ISO-8859-1";
+
+    private static Logger logger = Logger.getLogger(AtFileParser.class);
+
+    // regular expression from hell to find out time range
+    public static final Pattern DATE_LINE = Pattern.compile(
+        "^\\*\\s*Abflu[^t]+tafel?\\s*([^\\d]+)"  +
+        "(\\d{1,2})?\\.?(\\d{1,2})?\\.?(\\d{2,4})\\s*(?:(?:bis)|-)?\\s*" +
+        "(?:(\\d{1,2})?\\.?(\\d{1,2})?\\.?(\\d{2,4}))?\\s*.*$");
+
+    public AtFileParser() {
+    }
+
+
+    public ImportDischargeTable parse(File file) throws IOException {
+        return parse(file, "", 0);
+    }
+
+    public ImportDischargeTable parse(
+        File   file,
+        String prefix,
+        int    kind
+    )
+    throws IOException {
+
+        logger.info("parsing AT file: " + file);
+
+        BufferedReader br = null;
+
+        String line       = null;
+
+        boolean beginning = true;
+
+        ImportDischargeTable dischargeTable =
+            new ImportDischargeTable(kind, prefix + file.getName());
+
+        Date from = null;
+        Date to   = null;
+
+        try {
+            br = new BufferedReader(
+                 new InputStreamReader(
+                 new FileInputStream(file), ENCODING));
+
+            while ((line = br.readLine()) != null) {
+
+                String tmp = line.trim();
+
+                if (tmp.length() == 0) {
+                    continue;
+                }
+
+                Matcher m = DATE_LINE.matcher(tmp);
+                if (m.matches()) {
+                    from = guessDate(m.group(2), m.group(3), m.group(4));
+                    to   = guessDate(m.group(5), m.group(6), m.group(7));
+                    if (from == null) {
+                        Date t = from; from = to; to = t;
+                    }
+                    continue;
+                }
+
+                if (tmp.startsWith("#! name=")) {
+                    // XXX Skip the name,  because we don't know where to save
+                    // it at the moment
+
+                    //String name = tmp.substring(8);
+                    continue;
+                }
+
+                if (tmp.startsWith("#") || tmp.startsWith("*")) {
+                    continue;
+                }
+
+                String[] splits = tmp.replace(',', '.').split("\\s+");
+
+                if ((splits.length < 2) || (splits.length > 11)) {
+                    logger.warn("Found an invalid row in the AT file.");
+                    continue;
+                }
+
+                String strW = splits[0].trim();
+                double W    = Double.parseDouble(strW);
+
+                /* shift is used to differenciate between lines with
+                 * exactly 10 Qs and lines with less than 10 Qs. The shift
+                 * is only modified when it is the first line.
+                 */
+                int shift = -1;
+
+                if (splits.length != 11 && beginning) {
+                    shift = 10 - splits.length;
+                }
+
+
+                for (int i = 1; i < splits.length; i++) {
+                    double iW = W + shift + i;
+                    double iQ = Double.parseDouble(splits[i].trim());
+
+                    dischargeTable.addDischargeTableValue(
+                        new ImportDischargeTableValue(
+                            new BigDecimal(iQ/100.0),
+                            new BigDecimal(iW/100.0)));
+                }
+
+                beginning = false;
+            }
+        }
+        catch (NumberFormatException pe) {
+            logger.warn("AT: invalid number " + pe.getMessage());
+        }
+        finally {
+            if (br != null) {
+                br.close();
+            }
+        }
+
+        if (from != null) {
+            if (to != null && from.compareTo(to) > 0) {
+                Date t = from; from = to; to = t;
+            }
+            logger.info("from: " + from + " to: " + to);
+            ImportTimeInterval interval = new ImportTimeInterval(from, to);
+            dischargeTable.setTimeInterval(interval);
+        }
+
+        logger.info("Finished parsing AT file: " + file);
+
+        return dischargeTable;
+    }
+
+    public static Date guessDate(String day, String month, String year) {
+        // TODO evaluate whether DateGuesser class can do that.
+        if (day == null && month == null && year == null) {
+            return null;
+        }
+
+        logger.debug("day: " + day + " month: " + month + " year: " + year);
+
+        int dayI = 15;
+        if (day != null) {
+            try {
+                dayI = Integer.parseInt(day.trim());
+            }
+            catch (NumberFormatException nfe) {
+            }
+        }
+
+        int monthI = 6;
+        if (month != null) {
+            try {
+                monthI = Integer.parseInt(month.trim());
+            }
+            catch (NumberFormatException nfe) {
+            }
+        }
+
+        int yearI = 1900;
+        if (year != null) {
+            try {
+                yearI = Integer.parseInt(year.trim());
+                if (yearI < 100) {
+                    if (yearI < 20) {
+                        yearI += 2000;
+                    }
+                    else {
+                        yearI += 1900;
+                    }
+                }
+            }
+            catch (NumberFormatException nfe) {
+            }
+        }
+
+        Calendar cal = Calendar.getInstance();
+        cal.set(yearI, monthI-1, dayI, 12, 0, 0);
+        long ms = cal.getTimeInMillis();
+        cal.setTimeInMillis(ms - ms%1000);
+        return cal.getTime();
+    }
+
+
+    /** Parse one or more files, (useful for debugging), */
+    public static void main(String [] args) {
+
+        AtFileParser parser = new AtFileParser();
+
+        try {
+            for (String arg: args) {
+                parser.parse(new File(arg));
+            }
+        } catch(Exception e) {
+            logger.error("Exception caught " + e);
+        }
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :