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// Copyright (C) 2009 The Android Open Source Project
//
// 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 com.google.gimd
/**
* UserType[T] defines how to perform conversion between generic Message class and and type T.
*
* UserType[T] has children method used to define references to other UserTypes.
*/
abstract class UserType[T] {
def userTypeClass: Class[T] = ClassUtils.beanTypeOf(this.getClass, classOf[UserType[T]])
def toUserObject(itr: Message): T
def toMessage(obj: T) = toMessageBuffer(obj).readOnly
def toMessageBuffer(obj: T): MessageBuffer =
new MessageBuffer ++ fields.flatMap(fieldSpec2Field(obj, _).toList)
def fields: List[FieldSpec[T, _]]
def children: Seq[NestedMember[_]] = Seq()
protected final def FieldSpecOne[F](name: String, f1: (String, F) => Field, f2: T => F) =
new FieldSpecOne(name, f1, f2)
protected final def FieldSpecOption[F](name: String, f1: (String, F) => Field, f2: T => F,
default: F) = new FieldSpecOption(name, f1, f2, default)
private def fieldSpec2Field[F](obj: T, x: FieldSpec[T, F]) =
x.fieldFactoryOption(x.name, x.f2(obj))
}
object UserType {
implicit def fieldSpec2SingletonList[T,F](x: FieldSpec[T, F]) = List(x)
implicit def FieldSpecOne2Int[T](spec: FieldSpecOne[T, Int]) =
(m: Message) => m.one(spec.name).intField.value
implicit def FieldSpecOne2String[T](spec: FieldSpecOne[T, String]) =
(m: Message) => m.one(spec.name).stringField.value
implicit def FieldSpecOne2Timestamp[T](spec: FieldSpecOne[T, Timestamp]) =
(m: Message) => m.one(spec.name).timestampField.value
implicit def FieldSpecOne2Long[T](spec: FieldSpecOne[T, Long]) =
(m: Message) => m.one(spec.name).longField.value
implicit def FieldSpecOne2BigInt[T](spec: FieldSpecOne[T, BigInt]) =
(m: Message) => m.one(spec.name).bigIntField.value
implicit def FieldSpecOne2BigDecimalField[T](spec: FieldSpecOne[T, BigDecimal]) =
(m: Message) => m.one(spec.name).bigDecimalField.value
implicit def FieldSpecOption2Int[T](spec: FieldSpecOption[T, Int]) =
(m: Message) => m.oneOption(spec.name).map(_.intField.value).getOrElse(spec.defaultValue)
implicit def FieldSpecOption2String[T](spec: FieldSpecOption[T, String]) =
(m: Message) => m.oneOption(spec.name).map(_.stringField.value).getOrElse(spec.defaultValue)
implicit def FieldSpecOption2Timestamp[T](spec: FieldSpecOption[T, Timestamp]) =
(m: Message) => m.oneOption(spec.name).map(_.timestampField.value).getOrElse(spec.defaultValue)
implicit def FieldSpecOption2Long[T](spec: FieldSpecOption[T, Long]) =
(m: Message) => m.oneOption(spec.name).map(_.longField.value).getOrElse(spec.defaultValue)
implicit def FieldSpecOption2BigInt[T](spec: FieldSpecOption[T, BigInt]) =
(m: Message) => m.oneOption(spec.name).map(_.bigIntField.value).getOrElse(spec.defaultValue)
implicit def FieldSpecOption2BigDecimalField[T](spec: FieldSpecOption[T, BigDecimal]) =
(m: Message) => m.oneOption(spec.name).map(_.bigDecimalField.value).getOrElse(spec.defaultValue)
}
abstract sealed class FieldSpec[T, F](val name: String,
val fieldFactoryOption: (String, F) => Option[Field],
val f2: T => F)
final case class FieldSpecOne[T, F](override val name: String,
val fieldFactory: (String, F) => Field,
override val f2: T => F)
extends FieldSpec(name,
(name: String, value: F) => Some(fieldFactory(name, value)),
{ userObject: T =>
val result = f2(userObject)
if (result == null)
error("UserObject '1%s' returned null for field '%2s'.".format(userObject, name))
else
result
})
final case class FieldSpecOption[T, F](override val name: String,
val fieldFactory: (String, F) => Field,
override val f2: T => F,
val defaultValue: F)
extends FieldSpec(name,
(name: String, value: F) => if (value != defaultValue)
Some(fieldFactory(name, value))
else
None,
f2)
//TODO FieldSpecMany has to be implemented in a future
|
