Hi, I would like to write my own filter. I try to use the following class:
public class MyFilter extends TokenFilter {
private String myField
public SemanticQueryExpansionFilter(TokenStream input, myFiled)
{
super(input);
this.myField = myField;
}
@SuppressWarnings("deprecation")
public Token next() throws IOException
{
return parseToken(this.input.next());
}
@SuppressWarnings("deprecation")
public Token next(Token result) throws IOException
{
return parseToken(this.input.next());
}
protected Token parseToken(Token input)
{
/* do magic stuff with in.termBuffer() here (a char[] which can be
manipulated) */
/* set the changed length of the new term with in.setTermLength();
before returning it */
}
}
The factory and deploying is no problem, but I have a different question.
I want to trigger my filter at the last position after I have a clear set of
Tokens. This I can configure in my analyser XML-configuration.
My object from type MyFilter becomes in the constructor a input TokenStream.
I assume that this is a "list" of Tokens. The methods "next" use the
"parseToken" method. This is ok, the next Token from the input will be get
an a modified Token will be returned.
But this is a problem for me. The one-to-one mapping. I want to map a given
Token, for example "a" to three Tokens "a1", "a2", "a3". I want to do a
one-to-one mapping to "b" -> "c" too, and I want to have the possibility to
remove a Token "d" -> "".
How can I do this, when the "next" methods returns only one Token, not a
collection?
Thanks!
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