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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.dsl.fsm
import org.squeryl.dsl.{BinaryAMSOp, NonNumericalCoalesce, NonNumericalExpression, NumericalExpression}
import org.squeryl.dsl.ast.TypedExpressionNode
class CaseOfNonNumericalExpressionMatchStart[A](toMatch: NonNumericalExpression[A]) {
def when[B,C,D](m: NonNumericalExpression[B], r: NumericalExpression[D])
(implicit ev1: NonNumericalCoalesce[A,B] => NonNumericalExpression[C]) =
new CaseOfNonNumericalExpressionMatchYieldingNumerical[C,D](m.asInstanceOf[NonNumericalExpression[C]], r, None, Some(toMatch))
def when[B,C,D](m: NonNumericalExpression[B], r: NonNumericalExpression[D])
(implicit ev1: NonNumericalCoalesce[A,B] => NonNumericalExpression[C]) =
new CaseOfNonNumericalExpressionMatchYieldingNonNumerical[C,D](m.asInstanceOf[NonNumericalExpression[C]], r, None, Some(toMatch))
}
class CaseOfNonNumericalExpressionMatchYieldingNumerical[A,T](
val whenArg: TypedExpressionNode[A],
val thenArg: NumericalExpression[T],
val previous: Option[CaseOfChain],
val expressionToMatch: Option[TypedExpressionNode[_]] = None)
extends CaseOfChain {
def when[B,C,U,V](m: NonNumericalExpression[B], r: NumericalExpression[U])
(implicit ev1: NonNumericalCoalesce[A,B] => NonNumericalExpression[C],
ev2: BinaryAMSOp[T,U] => NumericalExpression[V]) =
new CaseOfNonNumericalExpressionMatchYieldingNumerical[C,V](m.asInstanceOf[NonNumericalExpression[C]], r.asInstanceOf[NumericalExpression[V]], Some(this))
def otherwise[U,V](r: NumericalExpression[U])
(implicit ev1: BinaryAMSOp[T,U] => NumericalExpression[V]) = {
val o = new BinaryAMSOp(thenArg, r, "!CaseOfNonNumericalExpressionMatchYieldingNumerical") : NumericalExpression[V]
new CaseOfChainNumericalTermination[V](o.mapper, r, this)
}
}
class CaseOfNonNumericalExpressionMatchYieldingNonNumerical[A,T](
val whenArg: TypedExpressionNode[A],
val thenArg: NonNumericalExpression[T],
val previous: Option[CaseOfChain],
val expressionToMatch: Option[TypedExpressionNode[_]] = None)
extends CaseOfChain {
def when[B,C,U,V](m: NonNumericalExpression[B], r: NonNumericalExpression[U])
(implicit ev1: NonNumericalCoalesce[A,B] => NonNumericalExpression[C],
ev2: NonNumericalCoalesce[T,U] => NonNumericalExpression[V]) =
new CaseOfNonNumericalExpressionMatchYieldingNonNumerical[C,V](m.asInstanceOf[NonNumericalExpression[C]], r.asInstanceOf[NonNumericalExpression[V]], Some(this), None)
def otherwise[U,V](r: NonNumericalExpression[U])
(implicit ev2: NonNumericalCoalesce[T,U] => NonNumericalExpression[V]) = {
val c = new NonNumericalCoalesce[T,U](thenArg, r, "!CaseOfNonNumericalExpressionMatchYieldingNonNumerical") : NonNumericalExpression[V]
new CaseOfChainNonNumericalTermination[V](c.mapper, r, this)
}
}
