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When multiple terms are being searched on, the first term is a spanWildcardQuery on the reverse property with a trailing wildcard. The middle property values are searched for as property values. The last term is a spanWildcardQuery on the propertyValue with a tailing wildcard.
Algorithm:
The contains Substring search has the following characteristics:
- This search is case in-sensitive.
- Only It searches on the property value and literal property value.
- The literal property part of the query is boosted by 50. This gives a literal match priority.
- Performs a wildcardQuery
- Lowercase and special characters removed during query parser parse.
Parsing is done with the following analyzers:
propertyValue - Uses our custom standard analyzer that has no stop words.
literal_propertyValue - Uses our custom literal analyzer. This literal analyzer uses Lucene's WhitespaceTokenizer with Lucene's
LowerCaseFilter.
Example of use:
The following examples are based on the Automobiles coding scheme.
...
Search string: graph
Lucene query: +propertyValue:*graph* literal_propertyValue:graph^50.0Complete query:
...
:
...
+
...
propertyValue:*graph* literal_propertyValue:graph^50.0
...
Result: 1 result
- entity code: NoRelationsConcept
- entity description: A concept for testing Graph Building on Concepts with no relations
...
Lucene query: +spanNear([mask(spanWildcardQuery(reverse_propertyValue:hparg*)) as propertyValue, mask(propertyValue:building) as propertyValue, mask(spanWildcardQuery(propertyValue:on*)) as propertyValue], 0, true) ((+literal_propertyValue:graph +literal_propertyValue:building +literal_propertyValue:on)^50.0)
Complete query:
...
)
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as propertyValue,
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mask(spanWildcardQuery(propertyValue:on*)) as propertyValue], 0, true) ((+literal_propertyValue:graph +literal_propertyValue:building +literal_propertyValue:on)^50.0
...
)
Result: 1 result
- entity code: NoRelationsConcept
- entity description: A concept for testing Graph Building on Concepts with no relations
...
Example 3:
Search string: ncept for testing graph
Lucene query: +spanNear([mask(spanWildcardQuery(reverse_propertyValue:tpecn*)) as propertyValue, mask(propertyValue:for) as propertyValue, mask(propertyValue:testing) as propertyValue, mask(spanWildcardQuery(propertyValue:graph*)) as propertyValue], 0, true) ((+literal_propertyValue:ncept +literal_propertyValue:for +literal_propertyValue:testing +literal_propertyValue:graph)^50.0)
Complete query:
...
mask(propertyValue:
...
testing) as propertyValue, mask(spanWildcardQuery(propertyValue:graph*)) as propertyValue], 0, true) ((+literal_propertyValue:ncept +literal_propertyValue:for +literal_propertyValue:testing +literal_propertyValue:graph)^50.0
...
)
Result: 1 result
- entity code: NoRelationsConcept
- entity description: A concept for testing Graph Building on Concepts with no relations
Associated JUnits:
Junits for contains Junit tests can be found here: https://github.com/lexevs/lexevs/blob/master/lbTest/src/test/java/org/LexGrid/LexBIG/Impl/function/query/lucene/searchAlgorithms/TestSubString.java
