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/*******************************************************************************
* Copyright 2010 Maxime Lévesque
*
* 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 org.squeryl.internals
import java.lang.annotation.Annotation
import net.sf.cglib.proxy.{Factory, Callback, CallbackFilter, Enhancer, NoOp}
import java.lang.reflect.{Member, Constructor, Method, Field, Modifier}
import collection.mutable.{HashSet, ArrayBuffer}
import org.squeryl.annotations._
import org.squeryl._
class PosoMetaData[T](val clasz: Class[T], val schema: Schema, val viewOrTable: View[T]) {
override def toString =
"'PosoMetaData[" + clasz.getSimpleName + "]" + fieldsMetaData.mkString("(",",",")")
def findFieldMetaDataForProperty(name: String) =
_fieldsMetaData.find(fmd => fmd.nameOfProperty == name)
val isOptimistic = viewOrTable.ked.map(_.isOptimistic).getOrElse(false)
val constructor =
_const.headOption.orElse(org.squeryl.internals.Utils.throwError(clasz.getName +
" must have a 0 param constructor or a constructor with only primitive types")).get
def fieldsMetaData =
_fieldsMetaData.filter(! _.isTransient)
/**
* fieldsMetaData the metadata of the persistent fields of this Poso
* primaryKey None if this Poso is not a KeyedEntity[], Either[a persistedField, a composite key]
*/
val (_fieldsMetaData, primaryKey): (Iterable[FieldMetaData], Option[Either[FieldMetaData,Method]]) = {
val isImplicitMode = _isImplicitMode
val sampleInstance4OptionTypeDeduction =
try {
constructor._1.newInstance(constructor._2 :_*).asInstanceOf[AnyRef];
}
catch {
case e:IllegalArgumentException =>
throw new RuntimeException("invalid constructor choice " + constructor._1, e)
case e:Exception =>
throw new RuntimeException("exception occurred while invoking constructor : " + constructor._1, e)
}
val members = new ArrayBuffer[(Member,HashSet[Annotation])]
_fillWithMembers(clasz, members)
val name2MembersMap =
members.groupBy(m => {
val n = m._1.getName
val idx = n.indexOf("_$eq")
if(idx != -1)
n.substring(0, idx)
else
n
})
val fmds = new ArrayBuffer[FieldMetaData];
for(e <- name2MembersMap) {
val name = e._1
val v = e._2
var a:Set[Annotation] = Set.empty
for(memberWithAnnotationTuple <- v)
a = a.union(memberWithAnnotationTuple._2)
val members = v.map(t => t._1)
// here we do a filter and not a find, because there can be more than one setter/getter/field
// with the same name, we want one that is not an erased type, excluding return and input type
// of java.lang.Object does it.
val o = classOf[java.lang.Object]
val field =
members.collectFirst{case f: Field if f.getType != o => f}
val getter =
members.collectFirst{case m: Method if (m.getName == name) && (m.getReturnType != o) => m}
val setter =
members.collectFirst{case m: Method if m.getName.endsWith("_$eq") && (m.getParameterTypes.apply(0) != o) => m}
val property = (field, getter, setter, a)
if(isImplicitMode && _groupOfMembersIsProperty(property)) {
val isOptimisitcCounter =
(for(k <- viewOrTable.ked;
counterProp <- k.optimisticCounterPropertyName if counterProp == name) yield true).isDefined
try {
val r = FieldMetaData.factory.build(this, name, property, sampleInstance4OptionTypeDeduction, isOptimisitcCounter)
fmds.append(r)
}
catch {
case e:Exception =>
println(">>>" + clasz.getCanonicalName)
println(">>>" + name)
throw new RuntimeException(
Utils.failSafeString(
"error while reflecting on metadata for " + property +
" of class " + this.clasz.getCanonicalName), e)
}
}
}
val k = fmds.find(fmd => fmd.isIdFieldOfKeyedEntity)
val compositePrimaryKeyGetter: Option[Method] =
if(k != None) // can't have both PK Field and CompositePK
None
else {
// verify if we have an 'id' method that is a composite key, in this case we need to construct a
// FieldMetaData that will become the 'primaryKey' field of this PosoMetaData
viewOrTable.ked.map { ked =>
val pkMethod = clasz.getMethod(ked.idPropertyName)
assert(pkMethod != null, "Could not get getter for " + ked.idPropertyName + " in " + clasz.getCanonicalName())
pkMethod
}
}
val metaDataForPk: Option[Either[FieldMetaData,Method]] =
if(k != None)
Some(Left(k.get))
else if(compositePrimaryKeyGetter != None)
Some(Right(compositePrimaryKeyGetter.get))
else
None
(fmds, metaDataForPk) //: (Iterable[FieldMetaData], Option[Either[FieldMetaData,Method]])
}
def optimisticCounter =
fieldsMetaData.find(fmd => fmd.isOptimisticCounter)
if(isOptimistic)
assert(optimisticCounter != None)
def _const = {
val r = new ArrayBuffer[(Constructor[_],Array[Object])]
// for(ct <- clasz.getConstructors)
// println("CT: " + ct.getParameterTypes.map(c=>c.getName).mkString(","))
for(ct <- clasz.getConstructors)
_tryToCreateParamArray(r, ct)
r.sortWith(
(a:(Constructor[_],Array[Object]),
b:(Constructor[_],Array[Object])) => a._2.length < b._2.length
)
}
def _tryToCreateParamArray(
r: ArrayBuffer[(Constructor[_],Array[Object])],
c: Constructor[_]): Unit = {
val params: Array[Class[_]] = c.getParameterTypes
if(params.length >= 1) {
val cn = clasz.getName
val test = params(0).getName + "$" + clasz.getSimpleName
if(cn == test)
org.squeryl.internals.Utils.throwError("inner classes are not supported, except when outer class is a singleton (object)\ninner class is : " + cn)
}
val res = new Array[Object](params.length)
for(i <- 0 to params.length -1) {
val v = FieldMetaData.createDefaultValue(schema.fieldMapper, c, params(i), None, None)
res(i) = v
}
r.append((c, res))
}
//def createSamplePoso[T](vxn: ViewExpressionNode[T], classOfT: Class[T]): T = {
//Enhancer.create(classOfT, new PosoPropertyAccessInterceptor(vxn)).asInstanceOf[T]
//}
def createSample(cb: Callback) =
FieldReferenceLinker.executeAndRestoreLastAccessedFieldReference(_builder(cb))
private[this] val _builder: (Callback) => T = {
val e = new Enhancer
e.setSuperclass(clasz)
val pc: Array[Class[_]] = constructor._1.getParameterTypes
e.setUseFactory(true)
(callB:Callback) => {
val cb = Array[Callback](callB, NoOp.INSTANCE)
e.setCallbacks(cb)
e.setCallbackFilter(PosoMetaData.finalizeFilter)
//TODO : are we creating am unnecessary instance ?
val fac = e.create(pc , constructor._2).asInstanceOf[Factory]
fac.newInstance(pc, constructor._2, cb).asInstanceOf[T]
}
}
private def _isImplicitMode = {
val rowAnnotation = clasz.getAnnotation(classOf[Row])
rowAnnotation == null ||
rowAnnotation.fieldToColumnCorrespondanceMode == FieldToColumnCorrespondanceMode.IMPLICIT
}
private def _groupOfMembersIsProperty(property: (Option[Field], Option[Method], Option[Method], Set[Annotation])): Boolean = {
if(property._4.find(an => an.isInstanceOf[Transient]) != None)
return false
val hasAField = property._1.exists { field =>
!Modifier.isStatic(field.getModifiers)
}
val hasGetter = property._2.exists { getter =>
!Modifier.isStatic(getter.getModifiers) &&
!classOf[java.lang.Void].isAssignableFrom(getter.getReturnType) &&
getter.getParameterTypes.length == 0
}
val hasSetter = property._3.exists { setter =>
!Modifier.isStatic(setter.getModifiers) &&
property._3.get.getParameterTypes.length == 1
}
val memberTypes = new ArrayBuffer[Class[_]]
if(hasAField)
memberTypes.append(property._1.get.getType)
if(hasGetter)
memberTypes.append(property._2.get.getReturnType)
if(hasSetter)
memberTypes.append(property._3.get.getParameterTypes.apply(0))
//not a property if it has no getter, setter or field
if(memberTypes.isEmpty)
return false
//verify that all types are compatible :
val c = memberTypes.remove(0)
for(c0 <- memberTypes) {
if((!c0.isAssignableFrom(c)) && (!c.isAssignableFrom(c0)))
return false
}
(hasAField, hasGetter, hasSetter) match {
case (true, false, false) => true
case (false, true, true) => true
case (true, true, true) => true
case (true, true, false) => true
case _ => false
}
}
private def _includeAnnotation(a: Annotation) =
a.isInstanceOf[ColumnBase] || a.isInstanceOf[Transient] || a.isInstanceOf[OptionType]
private def _addAnnotations(m: Field, s: HashSet[Annotation]) =
for(a <- m.getAnnotations if _includeAnnotation(a))
s.add(a)
private def _addAnnotations(m: Method, s: HashSet[Annotation]) =
for(a <- m.getAnnotations if _includeAnnotation(a))
s.add(a)
private def _includeFieldOrMethodType(c: Class[_]) =
schema.fieldMapper.isSupported(c)
//! classOf[Query[_]].isAssignableFrom(c)
private def _fillWithMembers(clasz: Class[_], members: ArrayBuffer[(Member,HashSet[Annotation])]): Unit = {
for(m <-clasz.getMethods if(m.getDeclaringClass != classOf[Object]) && _includeFieldOrMethodType(m.getReturnType)) {
m.setAccessible(true)
val t = (m, new HashSet[Annotation])
_addAnnotations(m, t._2)
members.append(t)
}
for(m <- clasz.getDeclaredFields if (m.getName.indexOf("$") == -1) && _includeFieldOrMethodType(m.getType)) {
m.setAccessible(true)
val t = (m, new HashSet[Annotation])
_addAnnotations(m, t._2)
members.append(t)
}
val c = clasz.getSuperclass
if(c != null)
_fillWithMembers(c, members)
}
}
object PosoMetaData {
val finalizeFilter = new CallbackFilter {
def accept(method: Method): Int =
if (method.getName == "finalize") 1 else 0
}
}
