Re: custom token filter generates empty tokens
Thanks Ahmet and Jose for you help :)
Regards,
Le 09/10/2014 18:29, Jose Fernandez a écrit :
When you return true from incrementToken() you tell Lucene to add your token to
the token stream. At the end of incrementToken() check for an empty token. If
it's empty then return incrementToken() to process the next token. This will
affect your positions so if you're doing phrase search you will need to adjust
the position attribute to account for the now-empty token.
-Original Message-
From: G.Long [mailto:jde...@gmail.com]
Sent: Thursday, October 09, 2014 7:54 AM
To: java-user@lucene.apache.org
Subject: custom token filter generates empty tokens
Hi :)
I wrote a custom token filter which removes special characters.
Sometimes, all characters of the token are removed so the filter procudes an
empty token. I would like to remove this token from the tokenstream but i'm not
sure how to do that.
Is there something missing in my custom token filter or do I need to chain
another custom token filter to remove empty tokens?
Regards :)
ps:
this is the code of my custom filter :
public class SpecialCharFilter extends TokenFilter {
private final CharTermAttribute termAtt =
addAttribute(CharTermAttribute.class);
protected SpecialCharFilter(TokenStream input) {
super(input);
}
@Override
public boolean incrementToken() throws IOException {
if (!input.incrementToken()) {
return false;
}
final char[] buffer = termAtt.buffer();
final int length = termAtt.length();
final char[] newBuffer = new char[length];
int newIndex = 0;
for (int i = 0; i length; i++) {
if (!isFilteredChar(buffer[i])) {
newBuffer[newIndex] = buffer[i];
newIndex++;
}
}
String term = new String(newBuffer);
term = term.trim();
char[] characters = term.toCharArray();
termAtt.setEmpty();
termAtt.copyBuffer(characters, 0, characters.length);
return true;
}
}
-
To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-user-h...@lucene.apache.org
SDL PLC confidential, all rights reserved.
If you are not the intended recipient of this mail SDL requests and requires
that you delete it without acting upon or copying any of its contents, and we
further request that you advise us.
SDL PLC is a public limited company registered in England and Wales.
Registered number: 02675207.
Registered address: Globe House, Clivemont Road, Maidenhead, Berkshire SL6 7DY,
UK.
This message has been scanned for malware by Websense. www.websense.com
-
To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-user-h...@lucene.apache.org
-
To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-user-h...@lucene.apache.org
custom token filter generates empty tokens
Hi :)
I wrote a custom token filter which removes special characters.
Sometimes, all characters of the token are removed so the filter
procudes an empty token. I would like to remove this token from the
tokenstream but i'm not sure how to do that.
Is there something missing in my custom token filter or do I need to
chain another custom token filter to remove empty tokens?
Regards :)
ps:
this is the code of my custom filter :
public class SpecialCharFilter extends TokenFilter {
private final CharTermAttribute termAtt =
addAttribute(CharTermAttribute.class);
protected SpecialCharFilter(TokenStream input) {
super(input);
}
@Override
public boolean incrementToken() throws IOException {
if (!input.incrementToken()) {
return false;
}
final char[] buffer = termAtt.buffer();
final int length = termAtt.length();
final char[] newBuffer = new char[length];
int newIndex = 0;
for (int i = 0; i length; i++) {
if (!isFilteredChar(buffer[i])) {
newBuffer[newIndex] = buffer[i];
newIndex++;
}
}
String term = new String(newBuffer);
term = term.trim();
char[] characters = term.toCharArray();
termAtt.setEmpty();
termAtt.copyBuffer(characters, 0, characters.length);
return true;
}
}
-
To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-user-h...@lucene.apache.org
RE: custom token filter generates empty tokens
When you return true from incrementToken() you tell Lucene to add your token to
the token stream. At the end of incrementToken() check for an empty token. If
it's empty then return incrementToken() to process the next token. This will
affect your positions so if you're doing phrase search you will need to adjust
the position attribute to account for the now-empty token.
-Original Message-
From: G.Long [mailto:jde...@gmail.com]
Sent: Thursday, October 09, 2014 7:54 AM
To: java-user@lucene.apache.org
Subject: custom token filter generates empty tokens
Hi :)
I wrote a custom token filter which removes special characters.
Sometimes, all characters of the token are removed so the filter procudes an
empty token. I would like to remove this token from the tokenstream but i'm not
sure how to do that.
Is there something missing in my custom token filter or do I need to chain
another custom token filter to remove empty tokens?
Regards :)
ps:
this is the code of my custom filter :
public class SpecialCharFilter extends TokenFilter {
private final CharTermAttribute termAtt =
addAttribute(CharTermAttribute.class);
protected SpecialCharFilter(TokenStream input) {
super(input);
}
@Override
public boolean incrementToken() throws IOException {
if (!input.incrementToken()) {
return false;
}
final char[] buffer = termAtt.buffer();
final int length = termAtt.length();
final char[] newBuffer = new char[length];
int newIndex = 0;
for (int i = 0; i length; i++) {
if (!isFilteredChar(buffer[i])) {
newBuffer[newIndex] = buffer[i];
newIndex++;
}
}
String term = new String(newBuffer);
term = term.trim();
char[] characters = term.toCharArray();
termAtt.setEmpty();
termAtt.copyBuffer(characters, 0, characters.length);
return true;
}
}
-
To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-user-h...@lucene.apache.org
SDL PLC confidential, all rights reserved.
If you are not the intended recipient of this mail SDL requests and requires
that you delete it without acting upon or copying any of its contents, and we
further request that you advise us.
SDL PLC is a public limited company registered in England and Wales.
Registered number: 02675207.
Registered address: Globe House, Clivemont Road, Maidenhead, Berkshire SL6 7DY,
UK.
This message has been scanned for malware by Websense. www.websense.com
-
To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-user-h...@lucene.apache.org
Re: custom token filter generates empty tokens
Hi G.Long,
You can use TrimFilter+LengthFilter to remove empty/whitespace tokens.
Ahmet
On Thursday, October 9, 2014 5:54 PM, G.Long jde...@gmail.com wrote:
Hi :)
I wrote a custom token filter which removes special characters.
Sometimes, all characters of the token are removed so the filter
procudes an empty token. I would like to remove this token from the
tokenstream but i'm not sure how to do that.
Is there something missing in my custom token filter or do I need to
chain another custom token filter to remove empty tokens?
Regards :)
ps:
this is the code of my custom filter :
public class SpecialCharFilter extends TokenFilter {
private final CharTermAttribute termAtt =
addAttribute(CharTermAttribute.class);
protected SpecialCharFilter(TokenStream input) {
super(input);
}
@Override
public boolean incrementToken() throws IOException {
if (!input.incrementToken()) {
return false;
}
final char[] buffer = termAtt.buffer();
final int length = termAtt.length();
final char[] newBuffer = new char[length];
int newIndex = 0;
for (int i = 0; i length; i++) {
if (!isFilteredChar(buffer[i])) {
newBuffer[newIndex] = buffer[i];
newIndex++;
}
}
String term = new String(newBuffer);
term = term.trim();
char[] characters = term.toCharArray();
termAtt.setEmpty();
termAtt.copyBuffer(characters, 0, characters.length);
return true;
}
}
-
To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-user-h...@lucene.apache.org
-
To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-user-h...@lucene.apache.org
