xerial.lens.MethodCallBuilder.scala Maven / Gradle / Ivy
/*
* Copyright 2012 Taro L. Saito
*
* 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 xerial.lens
import collection.mutable
import mutable.ArrayBuffer
import xerial.core.log.Logger
import xerial.core.util.CName
//--------------------------------------
//
// MethodCallBuilder.scala
// Since: 2012/03/27 16:43
//
//--------------------------------------
/**
* Builds method call arguments
* @author leo
*/
class MethodCallBuilder(m:ObjectMethod, owner:AnyRef) extends StandardBuilder[MethodParameter] with Logger {
// Find the default arguments of the method
protected def defaultValues = (for(p <- m.params; v <- findDefaultValue(p.name)) yield p.name -> v).toMap
protected def findParameter(name:String) : Option[MethodParameter] = {
val cname = CName(name)
m.params.find(p => CName(p.name) == cname)
}
private def findDefaultValue(name:String) : Option[Any] = {
findParameter(name).flatMap{ p =>
try {
val methodName = "%s$default$%d".format(m.name, p.index + 1)
val dm = owner.getClass.getMethod(methodName)
Some(dm.invoke(owner))
}
catch {
case _ : Throwable => None
}
}
}
def execute : Any = {
trace(s"holder: $holder")
val args = for(p <- m.params) yield {
(get(p.name) getOrElse TypeUtil.zero(p.rawType, p.valueType)).asInstanceOf[AnyRef]
}
trace { "args: " + args.mkString(", ") }
if(args.isEmpty)
m.jMethod.invoke(owner)
else
m.jMethod.invoke(owner, args:_*)
}
}