Home » lucene-2.3.2-src » org.apache » lucene » analysis » [javadoc | source]

org.apache.lucene.analysis
public class: ISOLatin1AccentFilter [javadoc | source]

java.lang.Object
   org.apache.lucene.analysis.TokenStream
      org.apache.lucene.analysis.TokenFilter
         org.apache.lucene.analysis.ISOLatin1AccentFilter

A filter that replaces accented characters in the ISO Latin 1 character set (ISO-8859-1) by their unaccented equivalent. The case will not be altered.

For instance, 'à' will be replaced by 'a'.

Fields inherited from org.apache.lucene.analysis.TokenFilter:
input

Constructor:
public ISOLatin1AccentFilter(TokenStream input) { super(input); }

Method from org.apache.lucene.analysis.ISOLatin1AccentFilter Summary:
next,   removeAccents

Methods from org.apache.lucene.analysis.TokenFilter:
close

Methods from org.apache.lucene.analysis.TokenStream:
close,   next,   next,   reset

Methods from java.lang.Object:
equals,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait

Method from org.apache.lucene.analysis.ISOLatin1AccentFilter Detail:
public final Token next(Token result) throws IOException { result = input.next(result); if (result != null) { final char[] buffer = result.termBuffer(); final int length = result.termLength(); // If no characters actually require rewriting then we // just return token as-is: for(int i=0;i< length;i++) { final char c = buffer[i]; if (c >= '\u00c0" && c < = '\u0178") { removeAccents(buffer, length); result.setTermBuffer(output, 0, outputPos); break; } } return result; } else return null; }
public final void removeAccents(char[] input, int length) { // Worst-case length required: final int maxSizeNeeded = 2*length; int size = output.length; while (size < maxSizeNeeded) size *= 2; if (size != output.length) output = new char[size]; outputPos = 0; int pos = 0; for (int i=0; i< length; i++, pos++) { final char c = input[pos]; // Quick test: if it's not in range then just keep // current character if (c < '\u00c0") output[outputPos++] = c; else { switch (c) { case '\u00C0" : // À case '\u00C1" : // Á case '\u00C2" : //  case '\u00C3" : // à case '\u00C4" : // Ä case '\u00C5" : // Å output[outputPos++] = 'A"; break; case '\u00C6" : // Æ output[outputPos++] = 'A"; output[outputPos++] = 'E"; break; case '\u00C7" : // Ç output[outputPos++] = 'C"; break; case '\u00C8" : // È case '\u00C9" : // É case '\u00CA" : // Ê case '\u00CB" : // Ë output[outputPos++] = 'E"; break; case '\u00CC" : // Ì case '\u00CD" : // Í case '\u00CE" : // Î case '\u00CF" : // Ï output[outputPos++] = 'I"; break; case '\u00D0" : // Ð output[outputPos++] = 'D"; break; case '\u00D1" : // Ñ output[outputPos++] = 'N"; break; case '\u00D2" : // Ò case '\u00D3" : // Ó case '\u00D4" : // Ô case '\u00D5" : // Õ case '\u00D6" : // Ö case '\u00D8" : // Ø output[outputPos++] = 'O"; break; case '\u0152" : // Œ output[outputPos++] = 'O"; output[outputPos++] = 'E"; break; case '\u00DE" : // Þ output[outputPos++] = 'T"; output[outputPos++] = 'H"; break; case '\u00D9" : // Ù case '\u00DA" : // Ú case '\u00DB" : // Û case '\u00DC" : // Ü output[outputPos++] = 'U"; break; case '\u00DD" : // Ý case '\u0178" : // Ÿ output[outputPos++] = 'Y"; break; case '\u00E0" : // à case '\u00E1" : // á case '\u00E2" : // â case '\u00E3" : // ã case '\u00E4" : // ä case '\u00E5" : // å output[outputPos++] = 'a"; break; case '\u00E6" : // æ output[outputPos++] = 'a"; output[outputPos++] = 'e"; break; case '\u00E7" : // ç output[outputPos++] = 'c"; break; case '\u00E8" : // è case '\u00E9" : // é case '\u00EA" : // ê case '\u00EB" : // ë output[outputPos++] = 'e"; break; case '\u00EC" : // ì case '\u00ED" : // í case '\u00EE" : // î case '\u00EF" : // ï output[outputPos++] = 'i"; break; case '\u00F0" : // ð output[outputPos++] = 'd"; break; case '\u00F1" : // ñ output[outputPos++] = 'n"; break; case '\u00F2" : // ò case '\u00F3" : // ó case '\u00F4" : // ô case '\u00F5" : // õ case '\u00F6" : // ö case '\u00F8" : // ø output[outputPos++] = 'o"; break; case '\u0153" : // œ output[outputPos++] = 'o"; output[outputPos++] = 'e"; break; case '\u00DF" : // ß output[outputPos++] = 's"; output[outputPos++] = 's"; break; case '\u00FE" : // þ output[outputPos++] = 't"; output[outputPos++] = 'h"; break; case '\u00F9" : // ù case '\u00FA" : // ú case '\u00FB" : // û case '\u00FC" : // ü output[outputPos++] = 'u"; break; case '\u00FD" : // ý case '\u00FF" : // ÿ output[outputPos++] = 'y"; break; default : output[outputPos++] = c; break; } } } } To replace accented characters in a String by unaccented equivalents.