Mercurial > dive4elements > river

annotate flys-backend/src/main/java/de/intevation/flys/importer/parsers/LineParser.java @ 4721:b0b1008c07e9

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LineParser: Make file name available to subclasses.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Thu, 27 Dec 2012 13:19:34 +0100
parents 23392c25fc11
children 53fcc0d5a03e
rev   line source
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3febaed762b8 Added new parser (stub) to read MINFO sediment density files; prepared import process to handle those files.
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1 package de.intevation.flys.importer.parsers;
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2
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3 import java.io.File;
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4
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5 import java.text.DateFormat;
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6 import java.text.NumberFormat;
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7 import java.text.ParseException;
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8 import java.text.SimpleDateFormat;
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9 import java.util.Calendar;
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10 import java.util.Date;
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11 import java.util.Locale;
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12
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13 import java.io.IOException;
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14 import java.io.LineNumberReader;
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15 import java.io.FileInputStream;
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16 import java.io.InputStreamReader;
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18 import org.apache.log4j.Logger;
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20
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21 /**
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22 * Base-Class for prasers for line-based file formats.
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23 * Calls reset(), then read line by line, calling handleLine() for each,
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24 * then calls finish().
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25 */
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26 public abstract class LineParser {
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27
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28 /** Private logger. */
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29 private static final Logger log = Logger.getLogger(LineParser.class);
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31 public static final String ENCODING = "ISO-8859-1";
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33 public static final Locale DEFAULT_LOCALE = Locale.GERMAN;
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35 public static final String START_META_CHAR = "#";
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36 public static final String SEPERATOR_CHAR = ";";
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37
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39 protected abstract void handleLine(int lineNum, String line);
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41 protected abstract void reset();
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43 protected abstract void finish();
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45 /** Name of file parsed. */
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46 protected String fileName;
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47
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48
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49 /**
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50 * This method reads each line of <i>file</i>. At the beginning,
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51 * <i>reset()</i> is called; afterwards for each line <i>handleLine()</i> is
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52 * called; at the end <i>finish</i> is called.
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53 *
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54 * @param file The file which should be parsed.
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55 */
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56 public void parse(File file) throws IOException {
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57 log.info("Parsing file '" + file + "'");
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58
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59 fileName = file.getName();
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60
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61 reset();
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62
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63 LineNumberReader in = null;
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64 try {
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65 in =
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66 new LineNumberReader(
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67 new InputStreamReader(
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68 new FileInputStream(file), ENCODING));
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69
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70 String line = null;
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71 int lineNum = 1;
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72 while ((line = in.readLine()) != null) {
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73 if ((line = line.trim()).length() == 0) {
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74 lineNum++;
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75 continue;
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76 }
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78 handleLine(lineNum++, line);
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79 }
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80 }
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81 finally {
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82 if (in != null) {
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83 in.close();
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84 }
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85 }
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86
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87 finish();
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88 }
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90
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91 /** Returns the name of the file parsed. */
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92 protected String getFileName() {
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93 return fileName;
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94 }
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95
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96
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97 protected static String stripMetaLine(String line) {
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98 String tmp = line.substring(1, line.length());
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99
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100 if (tmp.startsWith(" ")) {
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101 return tmp.substring(1, tmp.length());
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102 }
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103 else {
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104 return tmp;
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105 }
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106 }
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107
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108 public static double getDouble(String doubleString) throws ParseException {
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109 NumberFormat nf = NumberFormat.getInstance(DEFAULT_LOCALE);
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110 Number value = nf.parse(doubleString);
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111
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112 return value.doubleValue();
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113 }
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114
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115 public static Date getDate(String dateString) throws ParseException {
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116 DateFormat df = SimpleDateFormat.getDateInstance(
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117 SimpleDateFormat.MEDIUM, DEFAULT_LOCALE);
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118
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119 return df.parse(dateString);
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120 }
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121
2815
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122
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123 public static Date getDateFromYear(int year) {
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124 Calendar cal = Calendar.getInstance();
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125 cal.set(year, 0, 1);
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126
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127 return cal.getTime();
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128 }
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129 }
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130 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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