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persistence/mapper/src/main/scala/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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class FieldFinder[A <: Mapper[A], T: ClassManifest](metaMapper: Mapper[A], logger: net.liftweb.common.Logger) { | ||
import java.lang.reflect._ | ||
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logger.debug("Created FieldFinder for " + classManifest[T].erasure) | ||
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def isMagicObject(m: Method) = m.getReturnType.getName.endsWith("$"+m.getName+"$") && m.getParameterTypes.length == 0 | ||
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def typeFilter: Class[_]=>Boolean = classManifest[T].erasure.isAssignableFrom | ||
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/** | ||
* Find the magic mapper fields on the superclass | ||
*/ | ||
def findMagicFields(onMagic: Mapper[A], staringClass: 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.debug("typeFilter(" + f.getType + "); T=" + classManifest[T].erasure) | ||
ret | ||
}. | ||
map(f => (deMod(f.getName), f)) :_*) | ||
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logger.debug("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).find{ | ||
c => | ||
inst.getClass.getName.startsWith(c.getName)}.isDefined | ||
} | ||
} | ||
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} catch { | ||
case e => | ||
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(staringClass).distinct | ||
} | ||
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lazy val accessorMethods = findMagicFields(metaMapper, metaMapper.getClass.getSuperclass) | ||
} | ||
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67
persistence/mapper/src/test/scala/net/liftweb/mapper/OneToManySpecs.scala
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/* | ||
* Copyright 2009-2010 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 org.specs._ | ||
import _root_.org.specs.runner.{JUnit3, ConsoleRunner} | ||
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class OneToManySpecsAsTest extends JUnit3(OneToManySpecs) | ||
object OneToManySpecsRunner extends ConsoleRunner(OneToManySpecs) | ||
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object OneToManySpecs extends Specification { | ||
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val provider = DbProviders.H2MemoryProvider | ||
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private def ignoreLogger(f: => AnyRef): Unit = () | ||
def setupDB { | ||
MapperRules.createForeignKeys_? = c => false | ||
provider.setupDB | ||
Schemifier.destroyTables_!!(ignoreLogger _, Contact, Phone) | ||
Schemifier.schemify(true, ignoreLogger _, Contact, Phone) | ||
} | ||
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"OneToMany" should { | ||
"detect all MappedOneToMany fields" in { | ||
setupDB | ||
val contact = Contact.create | ||
val fields = contact.oneToManyFields | ||
fields.length must_== 1 | ||
fields(0).asInstanceOf[Any] must_== contact.phones | ||
} | ||
} | ||
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} | ||
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class Contact extends LongKeyedMapper[Contact] with IdPK with OneToMany[Long, Contact] { | ||
def getSingleton = Contact | ||
object phones extends MappedOneToMany(Phone, Phone.contact) | ||
} | ||
object Contact extends Contact with LongKeyedMetaMapper[Contact] | ||
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class Phone extends LongKeyedMapper[Phone] with IdPK { | ||
def getSingleton = Phone | ||
object contact extends LongMappedMapper(this, Contact) | ||
object number extends MappedString(this, 10) | ||
} | ||
object Phone extends Phone with LongKeyedMetaMapper[Phone] | ||
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} | ||
} |