datomisca.query.scala Maven / Gradle / Ivy
/*
* Copyright 2012 Pellucid and Zenexity
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package datomisca
/** A wrapper for a Datalog query represented as a Clojure map.
*
* @param query the query as Clojure data.
*/
abstract class AbstractQuery(val query: clojure.lang.IPersistentMap) {
override def equals(that: Any): Boolean = that match {
case thatQuery: AbstractQuery => this.query.equals(thatQuery.query)
case _ => false
}
override def hashCode: Int = query.hashCode
override def toString: String = query.toString
}
/** A wrapper for Datalog rules represented as a Clojure vector.
*
* @param query the rules as Clojure data.
*/
final class QueryRules(val edn: clojure.lang.PersistentVector) extends AnyVal {
override def toString: String = edn.toString
def ++(that: QueryRules): QueryRules = {
var t: clojure.lang.ITransientCollection = this.edn.asTransient()
val i = that.edn.iterator()
while (i.hasNext) {
t = t.conj(i.next())
}
new QueryRules(t.persistent().asInstanceOf[clojure.lang.PersistentVector])
}
}
/** Provides methods for parsing Datalog queries and rules. */
object Query extends macros.QueryMacros