alexandrepiveteau / epfl-datalog-kotlin Goto Github PK
View Code? Open in Web Editor NEWDatalog evaluation engine for Kotlin.
License: MIT License
Datalog evaluation engine for Kotlin.
License: MIT License
A Domain
for String
could define aggregates for columns that only contain String
s that can be converted to Int
using the toInt()
method.
package io.github.alexandrepiveteau.datalog.dsl.domains
import io.github.alexandrepiveteau.datalog.core.rule.Value
import io.github.alexandrepiveteau.datalog.dsl.Domain
/** An implementation of [Domain] for [String] values. */
private object StringDomain : Domain<String> {
private val one = Value("1")
override fun unit(): Value<String> = one
override fun min(
a: Value<String>,
b: Value<String>,
) = if (a.value.toInt() < b.value.toInt()) a else b
override fun max(
a: Value<String>,
b: Value<String>,
) = if (a.value.toInt() > b.value.toInt()) a else b
override fun sum(
a: Value<String>,
b: Value<String>,
) = Value((a.value.toInt() + b.value.toInt()).toString())
}
// Domains.
/** Returns the [Domain] for [String] values. */
fun String.Companion.domain(): Domain<String> = StringDomain
Currently, the EDB for all predicates is computed for all queries. Instead, the rule dependency graph could be inspected and used to only use rules which precede the predicate of interest.
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