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/*
* =========================================================================================
* Copyright © 2013-2015 the kamon project <http://kamon.io/>
*
* 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 kamon.annotation.el
import javax.el.ELProcessor
import kamon.Kamon
import kamon.annotation.Annotation
import scala.util.{ Failure, Success, Try }
/**
* Pimp ELProcessor injecting some useful methods.
*/
object EnhancedELProcessor {
private val Pattern = """[#|$]\{(.*)\}""".r
implicit class Syntax(val processor: ELProcessor) extends AnyVal {
import scala.collection.JavaConverters._
def evalToString(expression: String): String = extract(expression).map { str ⇒
eval[String](str) match {
case Success(value) ⇒ value
case Failure(cause) ⇒
Kamon(Annotation).log.error(s"${cause.getMessage} -> we will complete the operation with 'unknown' string")
"unknown"
}
} getOrElse expression
def evalToMap(expression: String): Map[String, String] = extract(expression).map { str ⇒
eval[Map[String, String]](s"{$str}") match {
case Success(value) ⇒ value.asInstanceOf[java.util.HashMap[String, String]].asScala.toMap
case Failure(cause) ⇒
Kamon(Annotation).log.error(s"${cause.getMessage} -> we will complete the operation with an empty map")
Map.empty[String, String]
}
} getOrElse Map.empty[String, String]
private def eval[A](str: String): Try[A] = Try(processor.eval(str).asInstanceOf[A])
private def extract(expression: String): Option[String] = expression match {
case Pattern(ex) ⇒ Some(ex)
case _ ⇒ None
}
}
}
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