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Merge pull request #1982 from lvitaly/feature/lift-mapper-scala-2.13
Lift-mapper with Scala 2.13 support
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107
persistence/mapper/src/main/scala-2.11/net/liftweb/mapper/FieldFinder.scala
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| /* | ||
| * Copyright 2006-2011 WorldWide Conferencing, LLC | ||
| * | ||
| * 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. | ||
| */ | ||
|
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| package net.liftweb | ||
| package mapper | ||
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| import scala.reflect.{ClassTag, classTag} | ||
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| class FieldFinder[T: ClassTag](metaMapper: AnyRef, logger: common.Logger) { | ||
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| import java.lang.reflect._ | ||
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| logger.debug("Created FieldFinder for " + classTag[T].runtimeClass) | ||
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| def isMagicObject(m: Method): Boolean = m.getReturnType.getName.endsWith("$" + m.getName + "$") && m.getParameterTypes.length == 0 | ||
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| def typeFilter: Class[_] => Boolean = classTag[T].runtimeClass.isAssignableFrom | ||
|
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| /** | ||
| * Find the magic mapper fields on the superclass | ||
| */ | ||
| def findMagicFields(onMagic: AnyRef, startingClass: Class[_]): List[Method] = { | ||
| // If a class name ends in $module, it's a subclass created for scala object instances | ||
| def deMod(in: String): String = | ||
| if (in.endsWith("$module")) in.substring(0, in.length - 7) | ||
| else in | ||
|
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| // find the magic fields for the given superclass | ||
| def findForClass(clz: Class[_]): List[Method] = clz match { | ||
| case null => Nil | ||
| case c => | ||
| // get the names of fields that represent the type we want | ||
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| val fields = Map(c.getDeclaredFields | ||
| .filter { f => | ||
| val ret = typeFilter(f.getType) | ||
| logger.trace("typeFilter(" + f.getType + "); T=" + classTag[T].runtimeClass) | ||
| ret | ||
| } | ||
| .map(f => (deMod(f.getName), f)): _*) | ||
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| logger.trace("fields: " + fields) | ||
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| // this method will find all the super classes and super-interfaces | ||
| def getAllSupers(clz: Class[_]): List[Class[_]] = clz match { | ||
| case null => Nil | ||
| case c => | ||
| c :: c.getInterfaces.toList.flatMap(getAllSupers) ::: | ||
| getAllSupers(c.getSuperclass) | ||
| } | ||
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| // does the method return an actual instance of an actual class that's | ||
| // associated with this Mapper class | ||
| def validActualType(meth: Method): Boolean = { | ||
| try { | ||
| // invoke the method | ||
| meth.invoke(onMagic) match { | ||
| case null => | ||
| logger.debug("Not a valid mapped field: %s".format(meth.getName)) | ||
| false | ||
| case inst => | ||
| // do we get a T of some sort back? | ||
| if (!typeFilter(inst.getClass)) false | ||
| else { | ||
| // find out if the class name of the actual thing starts | ||
| // with the name of this class or some superclass... | ||
| // basically, is an inner class of this class | ||
| getAllSupers(clz).exists(c => inst.getClass.getName.startsWith(c.getName)) | ||
| } | ||
| } | ||
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| } catch { | ||
| case e: Exception => | ||
| logger.debug("Not a valid mapped field: %s, got exception: %s".format(meth.getName, e)) | ||
| false | ||
| } | ||
| } | ||
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| // find all the declared methods | ||
| val meths = c.getDeclaredMethods.toList. | ||
| filter(_.getParameterTypes.length == 0). // that take no parameters | ||
| filter(m => Modifier.isPublic(m.getModifiers)). // that are public | ||
| filter(m => fields.contains(m.getName) && // that are associated with private fields | ||
| fields(m.getName).getType == m.getReturnType). | ||
| filter(validActualType) // and have a validated type | ||
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| meths ::: findForClass(clz.getSuperclass) | ||
| } | ||
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| findForClass(startingClass).distinct | ||
| } | ||
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| lazy val accessorMethods = findMagicFields(metaMapper, metaMapper.getClass.getSuperclass) | ||
| } |
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