Good. Well, I can see you are really looking for efficiency. Then, why don't you try fuzzy-logic? It should be even more efficient (and, frankly, even simpler).
The key is in the 6th less-relevant bit. Do a bit-by-bit XAND and the result should be '1...011111'. HTH, Freddy. -----Mensaje original----- De: Guillermo Meyer [mailto:[EMAIL PROTECTED] Enviado el: viernes, 13 de febrero de 2004 14:38 Para: 'Struts Users Mailing List' Asunto: RE: [OT] Case insensitive Map keys I'm trying the following: public class KeyGeneratedMap extends HashMap { public Object put(Object key, Object value) { return super.put(this.generateKey(key.toString()), value); } public Object get(Object key) { return super.get(this.generateKey(key.toString())); } /** * This generates an integer object for Strings and are case insensitive, that is * Hello and heLLO generate the same Integer object value */ private Object generateKey(String str) { int len = str.length(); int h=0; char val[] = str.toCharArray(); char c; for (int i = 0; i < len; i++) { c=val[i++]; if(c>=97 && c <=122) c-=32; h = 31*h + c; } return new Integer(h); } } This by now is three times faster than using toUpperCase for storing and retrievinig items from the hash. What do you think? -----Original Message----- From: Navjot Singh [mailto:[EMAIL PROTECTED] Sent: Viernes, 13 de Febrero de 2004 02:53 a.m. To: Struts Users Mailing List Subject: RE: [OT] Case insensitive Map keys oops!! thanks for correcting me freddy. well in that case, if you map is not modified frequently, try the FastHashMap from the Apache Commons. either you override and read and write your own. >-----Original Message----- >From: Villalba Arias, Fredy [BILBOMATICA] >[mailto:[EMAIL PROTECTED] >Sent: Thursday, February 12, 2004 5:50 PM >To: Struts Users Mailing List >Subject: RE: [OT] Case insensitive Map keys > > >Navjot, > >I believe this is exactly what Guillermo CLEARLY stated he had already >tried (and is not efficient enough for him). > >If you had taken a little bit longer and read carefully, then maybe >you'd have noticed. > >Regards, >Freddy. > >-----Mensaje original----- >De: Navjot Singh [mailto:[EMAIL PROTECTED] >Enviado el: jueves, 12 de febrero de 2004 13:14 >Para: Struts Users Mailing List; [EMAIL PROTECTED] >Asunto: RE: [OT] Case insensitive Map keys > >yes. here it is. > >public CIMap extends HashMap >{ > > public Object get(String key) > { > return super.get(key.toLowerCase()); > } > > public Object put(String key, Object value) > { > super.put(key.toLowerCase(),value); > } >} > >This was simple implementation. By the time you ask the Q and wait for >reply. you could have written on your own. > >Navjot Singh > > >>-----Original Message----- >>From: Guillermo Meyer [mailto:[EMAIL PROTECTED] >>Sent: Thursday, February 12, 2004 5:24 PM >>To: 'Struts Users Mailing List' >>Subject: [OT] Case insensitive Map keys >> >> >>Hi: >>Does anyone know an implementation of Map where keys are String and >>case insensitive? I want to do this: >> >>map.put("propertyName", "DATA"); >> >>And then, I should be able to get the value like this: >>Object obj = map.get("PROPERTYNAME"); >> >>Or like this: >>Object obj = map.get("propertyname"); //or whatever. case insensitive. >> >>We tried using toUppercase when putting and toUppercase when getting, >>and using equalsIgnoreCase but this is not as efficient as we need. >>May there be a way to calculate a hash for strings in upper or lower >>case to result in the same value? >> >>Thanks in advance. >> >>Guillermo. >> >> >>NOTA DE CONFIDENCIALIDAD >>Este mensaje (y sus anexos) es confidencial, esta dirigido >>exclusivamente a las personas direccionadas en el mail y puede >>contener informacion (i)de propiedad exclusiva de Interbanking S.A. o >>(ii) amparada por el secreto profesional. Cualquier opinion en el >>contenido, es exclusiva de su autor y no representa necesariamente la >>opinion de Interbanking S.A. 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