On Jun 30, 2008, at 8:08 PM, Paul J. Lucas wrote:
On Jun 30, 2008, at 8:55 PM, Paul J. Lucas wrote:
If I have a SortField with a type of STRING, is there any way to
sort in a case-insensitive manner?
Couldn't I also use a custom SortComparator?
OK, so I tried that by doing:
SortField sortField = new SortField(
sortFieldName,
new CaseInsensitiveStringSortComparator(), descending
);
where CaseInsensitiveStringSortComparator is:
class CaseInsensitiveStringSortComparator extends SortComparator {
public Comparable getComparable( String termText ) {
return new CaseInsensitiveStringComparable( termText );
}
}
and CaseInsensitiveStringComparable is:
public class CaseInsensitiveStringComparable implements Comparable {
public CaseInsensitiveStringComparable( String s ) {
m_string = s.toLowerCase();
}
public int compareTo( Object o ) {
final String s;
if ( o instanceof CaseInsensitiveStringComparable )
s = ((CaseInsensitiveStringComparable)o).m_string;
else if ( o instanceof String )
s = ((String)o).toLowerCase();
else
throw new ClassCastException();
return m_string.compareTo( s );
}
public boolean equals( Object o ) {
if ( !(o instanceof CaseInsensitiveStringComparable ) )
return false;
final CaseInsensitiveStringComparable c =
(CaseInsensitiveStringComparable)o;
return m_string.equals( c.m_string );
}
public int hashCode() {
return m_string.hashCode();
}
private final String m_string;
}
But when my code runs, I get a NullPointerException in Lucene's
SortComparator,
line 54 which reads:
return cachedValues[i.doc].compareTo (cachedValues[j.doc]);
because cachedCalues[i.doc] is null. But why is it null?
- Paul
P.S.: Im using Lucene 2.3.2.
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
