Added the step of parsing SpEL expressions delimited by ${ } in StringN1qlBasedQuery, then the actual evaluation of each expression.
Refactored StringN1qlBasedQuery to use SpEL across the board, including for N1QL specific placeholders (SELECT-FROM, WHERE filter, etc...).
Refactored StringN1qlBasedQuery to use local methods rather than static methods, and amended the unit tests accordingly (using mocks).
Refactored getStatement and getCountStatement so they can see the parameters passed in at runtime.
Added unit tests + integration test.
Added SpEL support example in documentation.
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