How to make Highlighter return more pre and post text of a fragment?

[Ron Grabowski <ro...@yahoo.com>]

Is there a way to configure Highlighter to return more pre and post text? For example suppose I'm searching text for "bank" from Alice in Wonderland:

 her sister
on the *bank*, and of having nothing

I would like to get more post and pre text from my result:

 Alice was beginning to get very tired of sitting by her sister
on the *bank*, and of having nothing to do:  once or twice she had
peeped into the book her sister was reading, but it had

I've tried various calls to GetBestFragments:

 string[] highlightedFragments = highlighter.GetBestFragments(new StandardAnalyzer(), aliceInWonderland, 1);

including bumping the 1 parameter to a larger number but the returned array only has one item in it. I'm not looking for other matches in the text; I want to expand the best matched fragment to give the user more context about the match.

Thanks,
Ron

Re: How to make Highlighter return more pre and post text of a fragment?

[Michael Mitiaguin <mi...@gmail.com>]

Ron,

Have a look at
http://www.archivum.info/java-dev@lucene.apache.org/2008-01/msg00111.html
Probably you need to do similar changes if you want greater control of
fragments or at least instantiate Fragmenter with a parameter ( fragment
size)  which should call a respective constructor.

  public class SimpleFragmenter : Fragmenter

	{
		private const int DEFAULT_FRAGMENT_SIZE = 100;
		private int currentNumFrags;
		private int fragmentSize;
		
		
		public SimpleFragmenter():this(DEFAULT_FRAGMENT_SIZE)
		{
		}
		
		
		/// <summary> </summary>
		/// <param name="fragmentSize">size in bytes of each fragment
		/// </param>
		public SimpleFragmenter(int fragmentSize)
		{
			this.fragmentSize = fragmentSize;
		}


Regards
Michael
On Mon, Oct 6, 2008 at 4:40 PM, Ron Grabowski <ro...@yahoo.com>wrote:

> Is there a way to configure Highlighter to return more pre and post text?
> For example suppose I'm searching text for "bank" from Alice in Wonderland:
>
>  her sister
> on the *bank*, and of having nothing
>
> I would like to get more post and pre text from my result:
>
>  Alice was beginning to get very tired of sitting by her sister
> on the *bank*, and of having nothing to do:  once or twice she had
> peeped into the book her sister was reading, but it had
>
> I've tried various calls to GetBestFragments:
>
>  string[] highlightedFragments = highlighter.GetBestFragments(new
> StandardAnalyzer(), aliceInWonderland, 1);
>
> including bumping the 1 parameter to a larger number but the returned array
> only has one item in it. I'm not looking for other matches in the text; I
> want to expand the best matched fragment to give the user more context about
> the match.
>
> Thanks,
> Ron
>
>