code changes needed without Camel Scala DSL

This is only for documentation purposes.

"transform" is more cumbersome than "process"
due to the extra tyep parameter.

Implementing process or evaluate as part of "this" class
via "with Processor" or "with Expression" leads to a
stack overflow in RouteBuilder.toString

src/main/scala/SearchDB.scala

@@ -2,11 +2,11 @@ package info.kwarc.mmt.errorview
 
 import java.util
 
-import org.apache.camel.Exchange
+import org.apache.camel.builder.RouteBuilder
 import org.apache.camel.component.jackson.JacksonDataFormat
 import org.apache.camel.model.DataFormatDefinition
-import org.apache.camel.scala.dsl.builder.RouteBuilder
 import org.apache.camel.util.jndi.JndiContext
+import org.apache.camel.{Exchange, Expression}
 import org.eclipse.jetty.server.handler.ResourceHandler
 
 import scala.collection.JavaConverters._
@@ -28,22 +28,25 @@ class SearchDB(inPrefix: String, addStaticRoute: Boolean) extends RouteBuilder {
     })
     hm
   }
+  def asExpression = new Expression {
+    override def evaluate[T](ex: Exchange, _c: Class[T]): T = query2HashMap2(ex).asInstanceOf[T]
+  }
 
+  override def configure() = {
     var prefix = inPrefix
     if (addStaticRoute) {
-    (prefix +
-      "static?matchOnUriPrefix=true&handlers=#staticHandler") -->
-      ("log:lll" + this.getClass + "?showHeaders=true")
+      from(prefix +
+        "static?matchOnUriPrefix=true&handlers=#staticHandler").to("log:lll" +
+        this.getClass + "?showHeaders=true")
       prefix = inPrefix + "sally/error/"
     }
-  ((prefix + "search2") transform query2HashMap2) -->
-    ("db:SELECT * FROM errors WHERE " +
+    from(prefix + "search2").transform(asExpression).to("db:SELECT * FROM errors WHERE " +
         Table.columns.map(col => col + " LIKE :#" + col).mkString(" AND ") +
-      " LIMIT :#limit") marshal new DataFormatDefinition(new JacksonDataFormat())
-  ((prefix + "count2") transform query2HashMap2) -->
-    ("db:SELECT COUNT(*) as count FROM errors WHERE " +
-      Table.columns.map(col => col + " LIKE :#" + col).mkString(" AND ")) marshal
-    new DataFormatDefinition(new JacksonDataFormat())
+        " LIMIT :#limit").marshal(new DataFormatDefinition(new JacksonDataFormat()))
+    from(prefix + "count2").transform(asExpression).to("db:SELECT COUNT(*) as count FROM errors WHERE " +
+        Table.columns.map(col => col + " LIKE :#" + col).mkString(" AND ")).marshal(
+        new DataFormatDefinition(new JacksonDataFormat()))
+  }
 }
 
 object SearchDB {