On Jun 30, 2005, at 4:12 PM, Bohl, David wrote:
FYI, I made an update to this (I'm the author) to handle span
queries. I
uploaded the updated code to the same bugzilla link. The code
doesn't treat
span queries like phrases - it just highlights the terms
individually (if
someone can find a way to highlight it as a phrase, feel free to
update it).
I'm not sure, at the moment, how this could integrate with the
Highlighter, but I wrote some code for Lucene in Action that displays
spans like this:
spanOr([f:quick, f:fox]):
the <quick> brown fox jumps over the lazy dog (0.37158427)
the quick brown <fox> jumps over the lazy dog (0.37158427)
the <quick> red fox jumps over the sleepy cat (0.37158427)
the quick red <fox> jumps over the sleepy cat (0.37158427)
spanFirst(spanNear([f:quick, f:fox], 1, true), 4):
the <quick brown fox> jumps over the lazy dog (0.18579213)
the <quick red fox> jumps over the sleepy cat (0.18579213)
f:the:
<the> quick brown fox jumps over the lazy dog (0.18579213)
the quick brown fox jumps over <the> lazy dog (0.18579213)
<the> quick red fox jumps over the sleepy cat (0.18579213)
the quick red fox jumps over <the> sleepy cat (0.18579213)
spanNear([f:quick, f:brown], 0, false):
the <quick brown> fox jumps over the lazy dog (0.2876891)
The relevant code is pasted below (and found in SpanQueryTest.java in
the Lucene in Action code):
private void dumpSpans(SpanQuery query) throws IOException {
Spans spans = query.getSpans(reader);
System.out.println(query + ":");
int numSpans = 0;
Hits hits = searcher.search(query);
float[] scores = new float[2];
for (int i = 0; i < hits.length(); i++) {
scores[hits.id(i)] = hits.score(i);
}
while (spans.next()) {
numSpans++;
int id = spans.doc();
Document doc = reader.document(id);
// for simplicity - assume tokens are in sequential,
// positions, starting from 0
Token[] tokens = AnalyzerUtils.tokensFromAnalysis(
analyzer, doc.get("f"));
StringBuffer buffer = new StringBuffer();
buffer.append(" ");
for (int i = 0; i < tokens.length; i++) {
if (i == spans.start()) {
buffer.append("<");
}
buffer.append(tokens[i].termText());
if (i + 1 == spans.end()) {
buffer.append(">");
}
buffer.append(" ");
}
buffer.append("(" + scores[id] + ") ");
System.out.println(buffer);
}
if (numSpans == 0) {
System.out.println(" No spans");
}
System.out.println();
}
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