Can anyone help me with code to get the topterms of a given field for a
query resultset?
Here is code modified from Luke to get the topterms for a field:
public TermInfo[] mostCommonTerms( String fieldName, int numberOfTerms )
{
//make sure min will get a positive number
if ( numberOfTerms < 1 )
{
numberOfTerms = Integer.MAX_VALUE;
}
numberOfTerms = Math.min( numberOfTerms, 50 );
//String[] commonTerms = new String[numberOfTerms];
try
{
IndexReader reader = IndexReader.open( indexPath );
TermInfoQueue tiq = new TermInfoQueue( numberOfTerms );
TermEnum terms = reader.terms();
int minFreq = 0;
while ( terms.next() )
{
if ( fieldName.equalsIgnoreCase( terms.term().field() ) )
{
if ( terms.docFreq() > minFreq )
{
tiq.put( new TermInfo( terms.term(), terms.docFreq()
) );
if ( tiq.size() >= numberOfTerms ) // if tiq
overfull
{
tiq.pop(); // remove lowest in tiq
minFreq = ( (TermInfo) tiq.top() ).docFreq; //
reset
// minFreq
}
}
}
}
TermInfo[] res = new TermInfo[ tiq.size() ];
for ( int i = 0; i < res.length; i++ )
{
res[ res.length - i - 1 ] = (TermInfo) tiq.pop();
}
reader.close();
return res;
}
catch ( IOException ioe )
{
logger.error( "IOException: " + ioe.getMessage() );
}
return null;
}
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