annotate backend/src/main/java/org/dive4elements/river/importer/parsers/LineParser.java @ 6328:53d08f33d094

Backend: Moved guessing of main values and there time intervals out of the STA parser. Same come will be useful to extend the WST parser to better handle official lines.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 13 Jun 2013 17:15:34 +0200
parents cc11780b3491
children c894b7b45c4c
rev   line source
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.importer.parsers;
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10
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11 import java.io.File;
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12
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13 import java.text.DateFormat;
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14 import java.text.NumberFormat;
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15 import java.text.ParseException;
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16 import java.text.SimpleDateFormat;
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17 import java.util.Calendar;
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18 import java.util.Date;
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19 import java.util.Locale;
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20
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21 import java.io.IOException;
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22 import java.io.LineNumberReader;
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23 import java.io.FileInputStream;
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24 import java.io.InputStreamReader;
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25
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26 import org.apache.log4j.Logger;
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27
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28
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29 /**
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30 * Base-Class for parsers for line-based file formats.
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31 * Calls reset(), then read line by line, calling handleLine() for each,
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32 * then calls finish().
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33 */
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34 public abstract class LineParser {
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35
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36 /** Private logger. */
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37 private static final Logger log = Logger.getLogger(LineParser.class);
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38
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39 public static final String ENCODING = "ISO-8859-1";
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40
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41 public static final Locale DEFAULT_LOCALE = Locale.GERMAN;
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42
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43 public static final String START_META_CHAR = "#";
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44 public static final String SEPERATOR_CHAR = ";";
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45
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46
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47 protected abstract void handleLine(int lineNum, String line);
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48
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49 protected abstract void reset();
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50
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51 protected abstract void finish();
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52
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53 /** Name of file parsed. */
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54 protected String fileName;
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55
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56 protected File inputFile;
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57
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58
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59 /**
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60 * This method reads each line of <i>file</i>. At the beginning,
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61 * <i>reset()</i> is called; afterwards for each line <i>handleLine()</i> is
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62 * called; at the end <i>finish</i> is called.
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63 *
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64 * @param file The file which should be parsed.
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65 */
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66 public void parse(File file) throws IOException {
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67 log.info("Parsing file '" + file + "'");
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68
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69 inputFile = file;
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70
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71 fileName = file.getName();
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72
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73 reset();
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75 LineNumberReader in = null;
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76 try {
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77 in =
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78 new LineNumberReader(
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79 new InputStreamReader(
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80 new FileInputStream(file), ENCODING));
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81
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82 String line = null;
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83 int lineNum = 1;
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84 while ((line = in.readLine()) != null) {
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85 if ((line = line.trim()).length() == 0) {
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86 lineNum++;
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87 continue;
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88 }
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90 handleLine(lineNum++, line);
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91 }
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92 }
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93 finally {
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94 if (in != null) {
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95 in.close();
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96 }
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97 }
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98
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99 finish();
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100 }
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101
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102
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103 /** Returns the name of the file parsed. */
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104 protected String getFileName() {
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105 return fileName;
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106 }
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107
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108 /** Returns the file currently parsed. */
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109 protected File getInputFile() {
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110 return inputFile;
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111 }
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112
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113
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114 protected static String stripMetaLine(String line) {
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115 String tmp = line.substring(1, line.length());
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116
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117 if (tmp.startsWith(" ")) {
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118 return tmp.substring(1, tmp.length());
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119 }
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120 else {
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121 return tmp;
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122 }
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123 }
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124
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125 public static double getDouble(String doubleString) throws ParseException {
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126 NumberFormat nf = NumberFormat.getInstance(DEFAULT_LOCALE);
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127 Number value = nf.parse(doubleString);
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128
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129 return value.doubleValue();
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130 }
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131
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132 public static Date getDate(String dateString) throws ParseException {
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133 DateFormat df = SimpleDateFormat.getDateInstance(
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134 SimpleDateFormat.MEDIUM, DEFAULT_LOCALE);
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135
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136 return df.parse(dateString);
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137 }
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138
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139
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140 /** Create Date on first moment (1st jan) of given year. */
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141 public static Date getStartDateFromYear(int year) {
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142 Calendar cal = Calendar.getInstance();
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143 cal.clear();
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144 cal.set(year, 0, 1, 0, 0, 0);
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145
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146 return cal.getTime();
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147 }
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148
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149
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150 /** Create Date on last moment (31st dec) of given year. */
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151 public static Date getEndDateFromYear(int year) {
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152 Calendar cal = Calendar.getInstance();
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153 cal.clear();
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154 cal.set(year, 11, 31, 23, 59, 59);
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155
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156 return cal.getTime();
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157 }
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158 }
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159 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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