scalabeaninfo.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 48 行

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2002-2008, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

// $Id: ScalaBeanInfo.scala 14532 2008-04-07 12:23:22Z washburn $

package scala.reflect

/** Provides some simple runtime processing necessary to create
 *  JavaBean descriptors for Scala entities. The compiler creates
 *  subclasses of this class automatically when the BeanInfo annotation is
 *  attached to a class. 
 *
 *  @author Ross Judson ([e-mail])
 */
abstract class ScalaBeanInfo(clazz: java.lang.Class[_], 
                             props: Array[String], 
                             methods: Array[String]) extends java.beans.SimpleBeanInfo {

  import java.beans._
  
  private val pd = new Array[PropertyDescriptor](props.length / 3)
  private val md = 
    for (m <- clazz.getMethods if methods.exists(_ == m.getName))
      yield new MethodDescriptor(m)

  init
  
  override def getPropertyDescriptors() = pd
  override def getMethodDescriptors() = md

  // override def getAdditionalBeanInfo() = Array(Introspector getBeanInfo clazz.getSuperclass)

  private def init {
    var i = 0;
    while (i < props.length) {
      pd(i/3) = new PropertyDescriptor(props(i), clazz, props(i+1), props(i+2))
      i = i + 3;
    }
  }
  
}