Added new objects to furnish the client

Author: bhermann

client/build.sbt

@@ -1,6 +1,11 @@
 name := "delphi-client"
 
-libraryDependencies += "io.spray" %% "spray-json" % "1.3.5"
 libraryDependencies += "joda-time" % "joda-time" % "2.10.5"
 
+/*
+libraryDependencies ++= Seq(
+  "com.softwaremill.sttp" %% "core" % "1.5.4",
+  "com.softwaremill.sttp" %% "spray-json" % "1.5.4"
+)*/
+
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.8" % "test"

client/src/main/scala/de/upb/cs/swt/delphi/client/DelphiClient.scala

@@ -0,0 +1,29 @@
+package de.upb.cs.swt.delphi.client
+
+import scala.util.Try
+import de.upb.cs.swt.delphi.client.QueryJson._
+import de.upb.cs.swt.delphi.core.model.Artifact
+
+abstract class DelphiClient(baseUri : String) {
+  def search(query : Query, prettyPrint : Boolean = false) : Try[Seq[SearchResult]]
+  /* = {
+    val queryParams = prettyPrint match {
+      case true => Map("pretty" -> "")
+      case false => Map()
+    }
+    val searchUri = uri"${baseUri}/search?$queryParams"
+
+    val request = sttp.body(query.toJson).post(searchUri)
+
+    //val (res, time) = processRequest(request)
+    //res.foreach(processResults(_, time))
+  }
+  */
+  def features() : Try[Seq[FieldDefinition]]
+
+  def retrieve(identifier : String) : Try[Artifact]
+
+  def version() : Try[String]
+
+  def statistics() : Try[Statistics]
+}

client/src/main/scala/de/upb/cs/swt/delphi/client/FieldDefinition.scala

@@ -0,0 +1,25 @@
+// Copyright (C) 2018 The Delphi Team.
+// See the LICENCE file distributed with this work for additional
+// information regarding copyright ownership.
+//
+// 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 de.upb.cs.swt.delphi.client
+
+import spray.json.DefaultJsonProtocol
+
+case class FieldDefinition(name : String, description : String)
+
+object FieldDefinitionJson extends DefaultJsonProtocol {
+  implicit val transform = jsonFormat2(FieldDefinition)
+}

client/src/main/scala/de/upb/cs/swt/delphi/client/Query.scala

@@ -0,0 +1,9 @@
+package de.upb.cs.swt.delphi.client
+
+import spray.json.DefaultJsonProtocol
+
+case class Query(query : String, limit : Option[Int] = Some(50))
+
+object QueryJson extends DefaultJsonProtocol {
+  implicit val queryRequestFormat = jsonFormat2(Query)
+}

client/src/main/scala/de/upb/cs/swt/delphi/client/Statistics.scala

@@ -0,0 +1,3 @@
+package de.upb.cs.swt.delphi.client
+
+case class Statistics(total : Long, hermesEnabled : Long)

client/src/main/scala/de/upb/cs/swt/delphi/client/StatisticsJson.scala

@@ -0,0 +1,7 @@
+package de.upb.cs.swt.delphi.client
+
+import spray.json.DefaultJsonProtocol
+
+object StatisticsJson extends DefaultJsonProtocol {
+  implicit val statisticsFormat = jsonFormat2(Statistics)
+}