svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.expressionevaluator / org.gvsig.expressionevaluator.lib / org.gvsig.expressionevaluator.lib.impl / src / main / java / org / gvsig / expressionevaluator / impl / EncodingUtils.java @ 45789
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1 | 44851 | jjdelcerro | package org.gvsig.expressionevaluator.impl; |
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2 | |||
3 | import java.io.BufferedReader; |
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4 | import java.io.File; |
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5 | import java.io.FileInputStream; |
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6 | import java.io.IOException; |
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7 | import java.io.InputStream; |
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8 | import java.io.InputStreamReader; |
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9 | import java.util.regex.Matcher; |
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10 | import java.util.regex.Pattern; |
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11 | import org.apache.commons.lang3.StringUtils; |
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12 | |||
13 | /**
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14 | *
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15 | * @author jjdelcerro
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16 | */
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17 | public class EncodingUtils { |
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18 | |||
19 | private static final Pattern RE_ENCODING = Pattern.compile(".*encoding[:]\\s*\"?([a-zA-Z_][a-zA-Z0-9_-]*)\"?.*"); |
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20 | |||
21 | public static String getEncoding(File f) { |
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22 | String line = getFirstLine(f);
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23 | String encoding = getEncoding(line);
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24 | return encoding;
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25 | } |
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26 | |||
27 | public static String getEncoding(InputStream is) { |
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28 | String line = getFirstLine(is);
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29 | String encoding = getEncoding(line);
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30 | return encoding;
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31 | } |
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32 | |||
33 | public static String getEncoding(String line) { |
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34 | if( StringUtils.isBlank(line) ) {
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35 | return null; |
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36 | } |
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37 | String encoding = null; |
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38 | Matcher m = RE_ENCODING.matcher(line);
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39 | if (m != null && m.matches() && m.groupCount() == 1) { |
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40 | String s = m.group(1); |
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41 | if (!StringUtils.isBlank(s)) {
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42 | encoding = s; |
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43 | } |
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44 | } |
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45 | return encoding;
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46 | } |
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47 | |||
48 | public static String getFirstLine(File f) { |
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49 | String line;
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50 | try (FileInputStream is = new FileInputStream(f)) { |
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51 | line = getFirstLine(is); |
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52 | } catch (Exception ex) { |
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53 | return null; |
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54 | } |
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55 | return line;
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56 | } |
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57 | |||
58 | public static String getFirstLine(InputStream is) { |
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59 | String line;
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60 | try (InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr)) { |
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61 | line = br.readLine(); |
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62 | while (line != null) { |
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63 | if (!StringUtils.isBlank(line)) {
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64 | break;
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65 | } |
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66 | line = br.readLine(); |
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67 | } |
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68 | } catch (IOException ex) { |
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69 | return null; |
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70 | } |
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71 | return line;
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72 | } |
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73 | } |