Scala Field类代码示例

//设置package包名称以及导入依赖的类
package be.mygod.preference

import java.lang.reflect.Field
import java.util.List

import android.os.Build
import android.support.v4.content.ContextCompat
import android.support.v4.view.ViewCompat
import android.support.v7.preference.{PreferenceGroup, PreferenceViewHolder, PreferenceGroupAdapter => Old}
import android.view.{LayoutInflater, View, ViewGroup}
import com.github.shadowsocks.R


object PreferenceGroupAdapter {
  private var preferenceLayoutsField: Field = _
  private var fieldResId: Field = _
  private var fieldWidgetResId: Field = _
  private val preferenceViewHolderConstructor = classOf[PreferenceViewHolder].getDeclaredConstructor(classOf[View])

  {
    val oldClass = classOf[Old]
    preferenceLayoutsField = oldClass.getDeclaredField("mPreferenceLayouts")
    preferenceLayoutsField.setAccessible(true)
    val c = oldClass.getDeclaredClasses.filter(c => c.getSimpleName == "PreferenceLayout").head
    fieldResId = c.getDeclaredField("resId")
    fieldResId.setAccessible(true)
    fieldWidgetResId = c.getDeclaredField("widgetResId")
    fieldWidgetResId.setAccessible(true)
    preferenceViewHolderConstructor.setAccessible(true)
  }
}

class PreferenceGroupAdapter(group: PreferenceGroup) extends Old(group) {
  import PreferenceGroupAdapter._

  protected lazy val preferenceLayouts = preferenceLayoutsField.get(this).asInstanceOf[List[AnyRef]]

  override def onCreateViewHolder(parent: ViewGroup, viewType: Int) = if (Build.VERSION.SDK_INT < 21) {
    val context = parent.getContext
    val inflater = LayoutInflater.from(context)
    val pl = preferenceLayouts.get(viewType)
    val view = inflater.inflate(fieldResId.get(pl).asInstanceOf[Int], parent, false)
    if (view.getBackground == null) {
      val array = context.obtainStyledAttributes(null, R.styleable.BackgroundStyle)
      var background = array.getDrawable(R.styleable.BackgroundStyle_android_selectableItemBackground)
      if (background == null)
        background = ContextCompat.getDrawable(context, android.R.drawable.list_selector_background)
      array.recycle
      val (s, t, e, b) = (ViewCompat.getPaddingStart(view), view.getPaddingTop,
        ViewCompat.getPaddingEnd(view), view.getPaddingBottom)
      view.setBackground(background)
      ViewCompat.setPaddingRelative(view, s, t, e, b)
    }
    val widgetFrame = view.findViewById(android.R.id.widget_frame).asInstanceOf[ViewGroup]
    if (widgetFrame != null) {
      val widgetResId = fieldWidgetResId.get(pl).asInstanceOf[Int]
      if (widgetResId != 0) inflater.inflate(widgetResId, widgetFrame) else widgetFrame.setVisibility(View.GONE)
    }
    preferenceViewHolderConstructor.newInstance(view)
  } else super.onCreateViewHolder(parent, viewType)
} 

//设置package包名称以及导入依赖的类
package io.skysail.core.model

import java.lang.reflect.Field
import java.lang.reflect.Type
import java.util.Collection
import io.skysail.core.restlet.utils.ScalaReflectionUtils

case class FieldModel(val f: java.lang.reflect.Field) {
  
  require(f != null, "you must provide a non-null field to construct a FieldModel")

  val name = f.getName
  
  //def getInputType(): String = f.getAnnotation(classOf[io.skysail.core.html.Field]).inputType().name();

  def isMandatory(): Boolean = {
    val notNullAnnotation = f.getAnnotation(classOf[javax.validation.constraints.NotNull]);
    if (notNullAnnotation != null) {
      return true;
    }
    val sizeAnnotation = f.getAnnotation(classOf[javax.validation.constraints.Size]);
    if (sizeAnnotation != null) {
      if (sizeAnnotation.min() > 0) {
        return true;
      }
    }
    return false;
  }
  
  //override def toString() = s"""${this.getClass.getSimpleName}(inputType: $getInputType, mandatory: $isMandatory)"""

  private def getEntityType() = {
    if (classOf[Collection[_]].isAssignableFrom(f.getType())) 
      ScalaReflectionUtils.getParameterizedType(f);
    else
      null
  }
} 

//设置package包名称以及导入依赖的类
package de.randombyte.nightmare_ai.config

import java.lang.reflect.Field

import com.google.gson.{ExclusionStrategy, FieldAttributes}


  def isFieldInSuperclass(superclass: Class[_], fieldName: String): Boolean = {
    if (superclass != null) {
      if (getField(superclass, fieldName) != null) true
      else isFieldInSuperclass(superclass.getSuperclass, fieldName)
    } else false
  }

  def getField(clazz: Class[_], fieldName: String): Field = {
    try {
      clazz.getDeclaredField(fieldName)
    } catch {
      case nsfError: NoSuchFieldException => null
    }
  }
} 

//设置package包名称以及导入依赖的类
package pub.ayada.scala.utils

import java.lang.reflect.Field

object ObjectUtils {

    def prettyPrint(a: Any): String = {
        // Recursively get all the fields; this will grab vals declared in parents of case classes.
        def getFields(cls: Class[_]): List[Field] =
            Option(cls.getSuperclass).map(getFields).getOrElse(Nil) ++
                cls.getDeclaredFields.toList.filterNot(f =>
                    f.isSynthetic || java.lang.reflect.Modifier.isStatic(f.getModifiers))
        a match {
            // Make Strings look similar to their literal form.
            case s: String =>
                '"' + Seq("\n" -> "\\n", "\r" -> "\\r", "\t" -> "\\t", "\"" -> "\\\"", "\\" -> "\\\\").foldLeft(s) {
                    case (acc, (c, r)) => acc.replace(c, r)
                } + '"'
            case xs: Seq[_] =>
                xs.map(prettyPrint).toString
            case xs: Array[_] =>
                s"Array(${xs.map(prettyPrint) mkString ", "})"
            // This covers case classes.
            case p: Product =>
                s"${p.productPrefix}(${
                    (getFields(p.getClass) map { f =>
                        f setAccessible true
                        s"${f.getName} = ${prettyPrint(f.get(p))}"
                    }) mkString ", "
                })"
            // General objects and primitives end up here.
            case q =>
                Option(q).map(_.toString).getOrElse("¡null!")
        }
    }
} 

//设置package包名称以及导入依赖的类
package com.kakao.mango.reflect

import java.lang.reflect.{Constructor, Method, Field}
import java.lang.reflect.Modifier._

import scala.reflect._


object Accessible {

  val modifiers: Field = {
    val field = classOf[Field].getDeclaredField("modifiers")
    field.setAccessible(true)
    field
  }

  def field[T: ClassTag](name: String): Field = {
    field(classTag[T].runtimeClass, name)
  }

  def field(clazz: Class[_], name: String): Field = {
    val field = clazz.getDeclaredField(name)
    field.setAccessible(true)
    modifiers.setInt(field, field.getModifiers & ~FINAL)
    field
  }

  def method[T: ClassTag](name: String, parameterTypes: Class[_]*): Method = {
    method(classTag[T].runtimeClass, name, parameterTypes: _*)
  }

  def method(clazz: Class[_], name: String, parameterTypes: Class[_]*): Method = {
    val method = clazz.getDeclaredMethod(name, parameterTypes: _*)
    method.setAccessible(true)
    method
  }

  def constructor[T](clazz: Class[T], parameterTypes: Class[_]*): Constructor[T] = {
    val constructor = clazz.getDeclaredConstructor(parameterTypes: _*)
    constructor.setAccessible(true)
    constructor
  }

  def firstConstructor[T: ClassTag]: Constructor[T] = {
    firstConstructor(classTag[T].runtimeClass.asInstanceOf[Class[T]])
  }

  def firstConstructor[T](clazz: Class[T]): Constructor[T] = {
    val constructor = clazz.getDeclaredConstructors()(0).asInstanceOf[Constructor[T]]
    constructor.setAccessible(true)
    constructor
  }

} 

//设置package包名称以及导入依赖的类
package org.quicli.model

import java.lang.reflect.Field

import org.quicli.QuicliException
import org.quicli.utils.reflect._

import scala.reflect.runtime.universe._


class IllegalArityException private(message: String) extends QuicliException(message)

object IllegalArityException {
  def throwIllegalBoolean(f: Field, a: Arity): Nothing = {
    throw new IllegalArityException(s"${commonMessage(f, a)}! A Boolean can take only 0 (default) or 1 arg.")
  }

  def throwIllegalTuple(f: Field, a: Arity): Nothing = {
    throw new IllegalArityException(s"${commonMessage(f, a)}! A TupleN can take only N args which is set by default.")
  }

  def throwIllegalSingleType(f: Field, a: Arity, typ: Type): Nothing = {
    val name: String = typ.simpleName
    throw new IllegalArityException(s"${commonMessage(f, a)}! A $name can take only 1 arg. " +
      s"You can use collections or arrays (e.g. List[$name], Array[$name]) to support multiple args.")
  }

  private def commonMessage(f: Field, arity: Arity): String = {
    s"Illegal arity of ${arity.value} for ${f.getDeclaringClass.getSimpleName}.${f.getName}"
  }
} 

//设置package包名称以及导入依赖的类
package org.quicli.executor

import java.lang.reflect.{Field, Method}

import org.quicli.converters.ConvertOpts
import org.quicli.model.CommandDesc.ReflectInfo
import org.quicli.model._
import org.quicli.parser.LineParser
import org.quicli.parser.impl.DefaultLineParser
import org.quicli.{QuicliApp, _}


class DefaultCommandLineExecutor extends CommandLineExecutor {

  private val lineParser: LineParser = new DefaultLineParser

  override def execute(line: Seq[String])(implicit app: QuicliApp): Any = {
    val cl: CommandLine = lineParser.parse(line)
    invokeCommand(cl.command, cl.args)
  }

  private def invokeCommand(cmd: CommandDesc, args: Args): Any = {
    val refInfo: ReflectInfo = cmd.reflectInfo
    val execMethod: Method = refInfo.execMethod
    val cmdInstance: Any = refInfo.clazz.newInstance()

    if (args.nonEmpty) {
      setCommandArgs(cmd, args, cmdInstance)
    }

    execMethod.invoke(cmdInstance)
  }

  private def setCommandArgs(cmd: CommandDesc, args: Args, cmdInstance: Any): Unit = {
    val params: Parameters = cmd.parameters

    params.maybeDefaultParam.foreach { defaultParam =>
      setParamValue(defaultParam, args.positionalArg, cmdInstance)
    }
  }

  private def setParamValue(param: ParameterDesc,
                            arg: Arg,
                            cmdInstance: Any): Unit = {
    if (arg.isEmpty) return

    val convertedValue: Any = param.arity match {
      case Arity.Single =>
        param.converter.convert(arg.headValue, ConvertOpts.Empty)
      case Arity.Variable =>
        param.converter.convert(arg.values, ConvertOpts.Empty)
      case Arity.Zero => !!!
    }

    val field: Field = param.reflectInfo.field
    field.setAccessible(true)
    field.set(cmdInstance, convertedValue)
  }

} 

//设置package包名称以及导入依赖的类
package org.quicli.extractors

import java.lang.reflect.{Field, Method}

import org.quicli.QuicliException
import org.quicli.model.Args


class IllegalCommandClassException private(message: String, cause: Throwable = null)
  extends QuicliException(message, cause)

object IllegalCommandClassException {
  def throwAbstractClass(c: Class[_]): Nothing = {
    throwIt(s"Abstract classes or interfaces can not be command types: ${c.getSimpleName}")
  }

  def throwMissingAnnotation(c: Class[_]): Nothing = {
    throwIt(s"@command is missing on ${c.getSimpleName}")
  }

  def throwCommandObject(c: Class[_]): Nothing = {
    throwIt(s"Scala objects cannot be commands: ${c.getSimpleName}")
  }

  def throwMissingConstructor(c: Class[_]): Nothing = {
    throwIt(s"Public no-arg constructor is missing in ${c.getSimpleName}")
  }

  def throwMissingExecMethod(c: Class[_]): Nothing = {
    throwIt(s"Command execution method is missing in ${c.getSimpleName}")
  }

  def throwMultipleExecMethods(c: Class[_], methods: Seq[Method]): Nothing = {
    val methodNames: Seq[String] = methods.map { m =>
      val paramTypes: String = m.getParameterTypes.map(_.getSimpleName).mkString(", ")
      s"${m.getName}($paramTypes)"
    }

    val methodsStr: String = s"${methodNames.init.mkString(", ")} and ${methodNames.last}"

    throwIt(s"Multiple execution methods in ${c.getSimpleName}: $methodsStr")
  }

  def throwInvalidExecMethod(m: Method): Nothing = {
    val paramTypes: String = m.getParameterTypes.map(_.getSimpleName).mkString(", ")
    val methodSign: String = s"${m.getDeclaringClass.getSimpleName}.${m.getName}($paramTypes)"
    val argsClass: String = classOf[Args].getName

    throwIt(s"$methodSign is not a valid execution method! " +
      s"It can be either parameterless or can only take a parameter of type $argsClass.")
  }

  def throwMultipleDefaultParamFields(c: Class[_], fields: Iterable[Field]): Nothing = {
    val fieldNames: String = fields.map(_.getName).mkString(", ")
    throwIt(s"More than one default (nameless) parameters in ${c.getSimpleName}: $fieldNames")
  }

  private def throwIt(message: String, cause: Throwable = null): Nothing = {
    throw new IllegalCommandClassException(message, cause)
  }
}