Re: How to get field contents

[Doug Cutting]

This can be done more efficiently if you only want to enumerate the 
terms of a particular field.  Term enumerations are ordered first by 
field, then by the term text.  You can also specify the initial position 
of a term enumeration.  Thus an efficient enumeration of the terms in 
"myField" can be done with something like:

  IndexReader reader = IndexReader.open("index");
  TermEnum te = reader.terms(new Term("myField", ""));
  while (te.term() != null && "myField".equals(te.term().field())) {
    ... do something silly ...
    te.next();
  }
Doug

Neil Couture wrote:
As far as I know you will have to go throught the index and verify the 
field field (that is not an error) of each term:

			IndexReader reader 	= IndexReader.open("index");
			TermEnum 	te 		= reader.terms(); 
			
			while ( te.next() ) {
				
				Term tt = te.term();
				
				String fieldOfTerm = tt.field();
				
				if ( fieldOfTerm.compareTo( "contents" ) ) {

                                        do_something_silly()...
                                
                                } else if ( fieldOfTerm.compareTo( "path" ) ) {
                                        do_something_silly2()...
                                }
                        }
-neil



-----Original Message-----
From: Ulrich Mayring [mailto:[EMAIL PROTECTED]
Sent: 13 juin, 2003 08:14
To: [EMAIL PROTECTED]
Subject: How to get field contents
Hello,

I'd like to build a list with all values from a certain field that occur 
in an index. Looking at the API, there's a method getFieldNames(), but I 
already know the field name, I want to get a list of all the values. 
Also, I can enumerate fields by giving Terms, but a Term means I have to 
have the field name and value.

Can this be done?

Kind regards,

Ulrich



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