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// Copyright (C) 2009 The Android Open Source Project
//
// 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 com.google.gimd
import java.lang.reflect.{Type, ParameterizedType}
object ClassUtils {
def beanTypeOf[B,T,R](base: Class[B], target: Class[T]): Class[R] =
beanTypeOf(base, base, target)
private def beanTypeOf[B,C,T,R](base: Class[B], current: Class[C], target: Class[T]): Class[R] =
if (current.getSuperclass == target)
beanTypeOf(base, current.getGenericSuperclass)
else if (current.getSuperclass != null)
beanTypeOf(base, current.getSuperclass, target)
else
throw cannotGuessType(base)
private def beanTypeOf[Q,R](base: Class[Q], t: Type): Class[R] = {
val c = t match {
case t: ParameterizedType =>
t.getActualTypeArguments()(0) match {
case c: Class[_] => c
case wrongType => throw cannotGuessType(base)
}
case wrongType => throw cannotGuessType(base)
}
c.asInstanceOf[Class[R]]
}
private def cannotGuessType[Q](base: Class[Q]): IllegalStateException =
new IllegalStateException("Cannot guess bean type wanted by " + base.getName)
}
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