example of encoding parameters in the methodname using the Dynamic trait

ParameterInMethodNameExample.scala

package com.log4.methodmissing

import java.lang.Integer

class ParameterInMethodNameExample extends Dynamic {
  def find(by:String, value:String) = "select from users where %s = '%s'".format(by, value)
  def find(by:String, value:Integer) = "select from users where %s = %s".format(by, value)
  def delete(by:String, value:String) = "delete from users where %s = '%s'".format(by, value)
  def delete(by:String, value:Integer) = "delete from users where %s = %s".format(by, value)

  def applyDynamic(methodName: String)(args: Any*) = {
    WordUtils.decamelize(methodName) match {
      case x :: xs if xs.contains("by") => {
        val invokeArgs = List(xs.last, args.head)
        val result = getClass.getMethod(x, invokeArgs.map(_.asInstanceOf[AnyRef].getClass): _*) // self-reflection
                             .invoke(this, invokeArgs.map(_.asInstanceOf[AnyRef]) : _*)

        println(result)
      }
      case _ => throw new UnsupportedOperationException
    }
  }
}

object ParameterInMethodNameExample {
  def main(args: Array[String]) {
    val inMethodNameExample = new ParameterInMethodNameExample

    inMethodNameExample.findByName("peter") // <-- calls find("name", "peter") 
    inMethodNameExample.findById(1234)      // <-- calls find("id", 1234) 

    inMethodNameExample.deleteById(123345)  // <-- calls delete("id", 123345)
    inMethodNameExample.deleteWhereId(123)  // <-- doesn't match pattern, throw USOE
  }
}

object WordUtils {
  def decamelize(s: String) = { // from http://stackoverflow.com/questions/2559759
    s.replaceAll("%s|%s|%s".format("(?<=[A-Z])(?=[A-Z][a-z])", "(?<=[^A-Z])(?=[A-Z])", "(?<=[A-Za-z])(?=[^A-Za-z])"), ",").toLowerCase.split(",").toList
  }
}