Class PalindromeFunction
java.lang.Object
org.eclipse.rdf4j.examples.function.PalindromeFunction
- All Implemented Interfaces:
Function
An example custom SPARQL function that detects palindromes
- Author:
- Jeen Broekstra
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Field Summary
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionevaluate(ValueFactory valueFactory, Value... args) Evaluate the function over the supplied input arguments, using the suppliedValueFactoryto produce the result.evaluate(TripleSource tripleSource, Value... args) Executes the palindrome function.getURI()return the URI 'http://example.org/custom-function/palindrome' as a StringMethods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitMethods inherited from interface org.eclipse.rdf4j.query.algebra.evaluation.function.Function
mustReturnDifferentResult
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Field Details
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NAMESPACE
- See Also:
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Constructor Details
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PalindromeFunction
public PalindromeFunction()
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Method Details
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getURI
return the URI 'http://example.org/custom-function/palindrome' as a String -
evaluate
Executes the palindrome function.- Specified by:
evaluatein interfaceFunction- Parameters:
tripleSource- theTripleSourceused in the query evaluation. This can be used to access the current state of the store.args- the function input arguments.- Returns:
- A boolean literal representing true if the input argument is a palindrome, false otherwise.
- Throws:
ValueExprEvaluationException- if more than one argument is supplied or if the supplied argument is not a literal.
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evaluate
Description copied from interface:FunctionEvaluate the function over the supplied input arguments, using the suppliedValueFactoryto produce the result.- Specified by:
evaluatein interfaceFunction- Parameters:
valueFactory- aValueFactoryto use for producing the function result.args- the function input arguments.- Returns:
- the function result value.
- Throws:
ValueExprEvaluationException
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