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lupyne / examples / queries.py

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"""
Convenient Query creation.

Operator overloading is used for combining boolean clauses.
"""

import lucene
lucene.initVM()
try:
    from org.apache.lucene import index, search
    from org.apache.lucene.search import spans
except ImportError:
    index = search = spans = lucene
from lupyne.engine import Query

### lucene ###

q1 = search.TermQuery(index.Term('text', 'lucene'))
q2 = search.PhraseQuery()
q2.add(index.Term('text', 'search'))
q2.add(index.Term('text', 'engine'))
q3 = search.BooleanQuery()
q3.add(q1, search.BooleanClause.Occur.MUST)
q3.add(q2, search.BooleanClause.Occur.MUST)
assert str(q3) == '+text:lucene +text:"search engine"'

q1 = spans.SpanTermQuery(index.Term('text', 'hello'))
q2 = spans.SpanTermQuery(index.Term('text', 'world'))
q3 = spans.SpanPositionRangeQuery(q1, 0, 10)
q4 = spans.SpanNearQuery([q1, q2], 0, True)
q5 = spans.SpanNotQuery(q3, q4)
assert str(q5) == 'spanNot(spanPosRange(text:hello, 0, 10), spanNear([text:hello, text:world], 0, true))'

### lupyne ###

q = Query.term('text', 'lucene') & Query.phrase('text', 'search', 'engine')
assert isinstance(q, search.BooleanQuery)
assert str(q) == '+text:lucene +text:"search engine"'

q = Query.span('text', 'hello')[:10] - Query.near('text', 'hello', 'world')
assert isinstance(q, spans.SpanQuery)
assert str(q) == 'spanNot(spanPosRange(text:hello, 0, 10), spanNear([text:hello, text:world], 0, true))'