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...nce-common/src/main/scala/net/sansa_stack/inference/utils/JenaTripleToNTripleString.scala
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package net.sansa_stack.inference.utils | ||
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import org.apache.jena.graph.Triple | ||
import org.apache.jena.shared.PrefixMapping | ||
import org.apache.jena.sparql.util.FmtUtils | ||
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/** | ||
* Convert a Jena Triple to an N-Triples string. | ||
* | ||
* @note it turns out, that it might be more efficient to use the Jena stream based writer API per partition. | ||
* | ||
* @author Lorenz Buehmann | ||
*/ | ||
class JenaTripleToNTripleString | ||
extends Function[Triple, String] | ||
with java.io.Serializable { | ||
override def apply(t: Triple): String = { | ||
val subStr = | ||
if (t.getSubject.isBlank) { | ||
s"_:${t.getSubject.getBlankNodeLabel}" | ||
} else { | ||
s"<${t.getSubject.getURI}>" | ||
} | ||
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val objStr = | ||
if (t.getObject.isLiteral) { | ||
t.getObject | ||
} else if (t.getObject.isBlank) { | ||
s"_:${t.getObject}" | ||
} else { | ||
s"<${t.getObject}>" | ||
} | ||
s"$subStr <${t.getPredicate}> $objStr ." | ||
} | ||
override def apply(t: Triple): String = s"${FmtUtils.stringForTriple(t, null.asInstanceOf[PrefixMapping])} ." | ||
} | ||
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package net.sansa_stack.inference.utils | ||
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/** | ||
* Some utils for logical combinations of boolean functions. | ||
*/ | ||
object PredicateUtils { | ||
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implicit class RichPredicate[A](f: A => Boolean) extends (A => Boolean) { | ||
def apply(v: A): Boolean = f(v) | ||
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/** | ||
* Logical 'and'. | ||
* | ||
* @param g | ||
* @return | ||
*/ | ||
def &&(g: A => Boolean): A => Boolean = { x: A => | ||
f(x) && g(x) | ||
} | ||
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/** | ||
* Logical 'or'. | ||
* | ||
* @param g | ||
* @return | ||
*/ | ||
def ||(g: A => Boolean): A => Boolean = { x: A => | ||
f(x) || g(x) | ||
} | ||
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/** | ||
* Logical 'not' | ||
* | ||
* @return | ||
*/ | ||
def unary_! : A => Boolean = { x: A => | ||
!f(x) | ||
} | ||
} | ||
} |