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17 package org.apache.commons.text.translate;
18
19 import java.io.IOException;
20 import java.io.Writer;
21
22 import org.apache.commons.lang3.CharUtils;
23 import org.apache.commons.lang3.StringUtils;
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34 public final class CsvTranslators {
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39 public static class CsvEscaper extends SinglePassTranslator {
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41 @Override
42 void translateWhole(final CharSequence input, final Writer writer) throws IOException {
43 final String inputSting = input.toString();
44 if (StringUtils.containsNone(inputSting, CSV_SEARCH_CHARS)) {
45 writer.write(inputSting);
46 } else {
47
48 writer.write(CSV_QUOTE);
49 writer.write(StringUtils.replace(inputSting, CSV_QUOTE_STR, CSV_ESCAPED_QUOTE_STR));
50 writer.write(CSV_QUOTE);
51 }
52 }
53 }
54
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56
57 public static class CsvUnescaper extends SinglePassTranslator {
58
59 @Override
60 void translateWhole(final CharSequence input, final Writer writer) throws IOException {
61
62 if (input.charAt(0) != CSV_QUOTE || input.charAt(input.length() - 1) != CSV_QUOTE) {
63 writer.write(input.toString());
64 return;
65 }
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68 final String quoteless = input.subSequence(1, input.length() - 1).toString();
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70 if (StringUtils.containsAny(quoteless, CSV_SEARCH_CHARS)) {
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72 writer.write(StringUtils.replace(quoteless, CSV_ESCAPED_QUOTE_STR, CSV_QUOTE_STR));
73 } else {
74 writer.write(quoteless);
75 }
76 }
77 }
78
79 private static final char CSV_DELIMITER = ',';
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81 private static final char CSV_QUOTE = '"';
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83 private static final String CSV_QUOTE_STR = String.valueOf(CSV_QUOTE);
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86 private static final String CSV_ESCAPED_QUOTE_STR = CSV_QUOTE_STR + CSV_QUOTE_STR;
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89 private static final char[] CSV_SEARCH_CHARS = { CSV_DELIMITER, CSV_QUOTE, CharUtils.CR, CharUtils.LF };
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91
92 private CsvTranslators() { }
93 }