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Preliminary support for isTriple, Triple, Subject, Predicate, and Obj…
…ect builtin operators.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| module SPARQL; module Algebra | ||
| class Operator | ||
| ## | ||
| # The SPARQL `isTriple` operator. | ||
| # | ||
| # @see xxx | ||
| class IsTriple < Operator::Unary | ||
| include Evaluatable | ||
|
|
||
| NAME = :isTriple | ||
|
|
||
| ## | ||
| # Returns `true` if the operand is an `RDF::Statement`, `false` otherwise. | ||
| # | ||
| # @param [RDF::Term] term | ||
| # an RDF term | ||
| # @return [RDF::Literal::Boolean] `true` or `false` | ||
| # @raise [TypeError] if the operand is not an RDF term | ||
| def apply(term) | ||
| case term | ||
| when RDF::Statement then RDF::Literal::TRUE | ||
| when RDF::Term then RDF::Literal::FALSE | ||
| else raise TypeError, "expected an RDF::Term, but got #{term.inspect}" | ||
| end | ||
| end | ||
| end # IsTriple | ||
| end # Operator | ||
| end; end # SPARQL::Algebra |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| module SPARQL; module Algebra | ||
| class Operator | ||
| ## | ||
| # The SPARQL logical `object` operator. | ||
| # | ||
| # Returns the object part of `arg` as a term. | ||
| # | ||
| # @see xxx | ||
| class Object < Operator::Unary | ||
| include Evaluatable | ||
|
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| NAME = :object | ||
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| ## | ||
| # Returns the object part of arg. | ||
| # | ||
| # @param [RDF::Statement] operand | ||
| # the operand | ||
| # @return [RDF::Literal] | ||
| # @raise [TypeError] if the operand is not a statement | ||
| def apply(operand) | ||
| raise TypeError, "expected an RDF::Statement, but got #{operand.inspect}" unless operand.is_a?(RDF::Statement) | ||
| operand.object | ||
| end | ||
| end # Object | ||
| end # Operator | ||
| end; end # SPARQL::Algebra |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| module SPARQL; module Algebra | ||
| class Operator | ||
| ## | ||
| # The SPARQL logical `predicate` operator. | ||
| # | ||
| # Returns the predicate part of `arg` as a term. | ||
| # | ||
| # @see xxx | ||
| class Predicate < Operator::Unary | ||
| include Evaluatable | ||
|
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| NAME = :predicate | ||
|
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| ## | ||
| # Returns the predicate part of arg. | ||
| # | ||
| # @param [RDF::Statement] operand | ||
| # the operand | ||
| # @return [RDF::Literal] | ||
| # @raise [TypeError] if the operand is not a statement | ||
| def apply(operand) | ||
| raise TypeError, "expected an RDF::Statement, but got #{operand.inspect}" unless operand.is_a?(RDF::Statement) | ||
| operand.predicate | ||
| end | ||
| end # Predicate | ||
| end # Operator | ||
| end; end # SPARQL::Algebra |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| module SPARQL; module Algebra | ||
| class Operator | ||
| ## | ||
| # The SPARQL logical `subject` operator. | ||
| # | ||
| # Returns the subject part of `arg` as a term. | ||
| # | ||
| # @see xxx | ||
| class Subject < Operator::Unary | ||
| include Evaluatable | ||
|
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| NAME = :subject | ||
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| ## | ||
| # Returns the subject part of arg. | ||
| # | ||
| # @param [RDF::Statement] operand | ||
| # the operand | ||
| # @return [RDF::Literal] | ||
| # @raise [TypeError] if the operand is not a statement | ||
| def apply(operand) | ||
| raise TypeError, "expected an RDF::Statement, but got #{operand.inspect}" unless operand.is_a?(RDF::Statement) | ||
| operand.subject | ||
| end | ||
| end # Subject | ||
| end # Operator | ||
| end; end # SPARQL::Algebra |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| module SPARQL; module Algebra | ||
| class Operator | ||
| ## | ||
| # The SPARQL `triple` operator. | ||
| # | ||
| # @see xxx | ||
| class Triple < Operator::Ternary | ||
| include Evaluatable | ||
|
|
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| NAME = :triple | ||
|
|
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| ## | ||
| # @param [RDF::Term] subject | ||
| # @param [RDF::Term] predicate | ||
| # @param [RDF::Term] object | ||
| # @return [RDF::URI] | ||
| # @raise [TypeError] if the operand is not a simple literal | ||
| def apply(subject, predicate, object) | ||
| triple = RDF::Statement(subject, predicate, object) | ||
| raise TypeError, "valid components, but got #{triple.inspect}" unless triple.valid? | ||
| triple | ||
| end | ||
| end # Triple | ||
| end # Operator | ||
| end; end # SPARQL::Algebra |
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