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A Scala ORM and DSL for talking with Databases using minimum verbosity and maximum type safety
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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.boilerplate

import org.squeryl.dsl.fsm.{GroupQueryYield, QueryElements, GroupByState}
import org.squeryl.dsl.TypedExpression

trait GroupBySignatures {
  self: QueryElements[_] =>

  def groupBy[T1](e1: =>TypedExpression[T1,_]): GroupByState[T1] =
    new GroupQueryYield[T1](this,
      ()=>List(e1)
    )

  def groupBy[T1,T2](e1: =>TypedExpression[T1,_], e2: =>TypedExpression[T2,_]): GroupByState[Product2[T1,T2]] =
    new GroupQueryYield[Product2[T1,T2]](this,
      ()=>List(e1, e2)
    )

  def groupBy[T1,T2,T3](e1: =>TypedExpression[T1,_], e2: =>TypedExpression[T2,_], e3: =>TypedExpression[T3,_]): GroupByState[Product3[T1,T2,T3]] =
    new GroupQueryYield[Product3[T1,T2,T3]](this,
      ()=>List(e1, e2, e3)
    )

  def groupBy[T1,T2,T3,T4](e1: =>TypedExpression[T1,_], e2: =>TypedExpression[T2,_], e3: =>TypedExpression[T3,_], e4: =>TypedExpression[T4,_]): GroupByState[Product4[T1,T2,T3,T4]] =
    new GroupQueryYield[Product4[T1,T2,T3,T4]](this,
      ()=>List(e1, e2, e3, e4)
    )

  def groupBy[T1,T2,T3,T4,T5](e1: =>TypedExpression[T1,_], e2: =>TypedExpression[T2,_], e3: =>TypedExpression[T3,_], e4: =>TypedExpression[T4,_], e5: =>TypedExpression[T5,_]): GroupByState[Product5[T1,T2,T3,T4,T5]] =
    new GroupQueryYield[Product5[T1,T2,T3,T4,T5]](this,
      ()=>List(e1, e2, e3, e4, e5)
    )

  def groupBy[T1,T2,T3,T4,T5,T6]
    (e1: =>TypedExpression[T1,_], e2: =>TypedExpression[T2,_], e3: =>TypedExpression[T3,_], e4: =>TypedExpression[T4,_],
     e5: =>TypedExpression[T5,_], e6: =>TypedExpression[T6,_]):
     GroupByState[Product6[T1,T2,T3,T4,T5,T6]] =
    new GroupQueryYield[Product6[T1,T2,T3,T4,T5,T6]](this,
      ()=>List(e1, e2, e3, e4, e5, e6)
    )

  def groupBy[T1,T2,T3,T4,T5,T6,T7]
    (e1: =>TypedExpression[T1,_], e2: =>TypedExpression[T2,_], e3: =>TypedExpression[T3,_], e4: =>TypedExpression[T4,_],
     e5: =>TypedExpression[T5,_], e6: =>TypedExpression[T6,_], e7: =>TypedExpression[T7,_]):
     GroupByState[Product7[T1,T2,T3,T4,T5,T6,T7]] =
    new GroupQueryYield[Product7[T1,T2,T3,T4,T5,T6,T7]](this,
      ()=>List(e1, e2, e3, e4, e5, e6, e7)
    )

  def groupBy[T1,T2,T3,T4,T5,T6,T7,T8]
    (e1: =>TypedExpression[T1,_], e2: =>TypedExpression[T2,_], e3: =>TypedExpression[T3,_], e4: =>TypedExpression[T4,_],
     e5: =>TypedExpression[T5,_], e6: =>TypedExpression[T6,_], e7: =>TypedExpression[T7,_], e8: =>TypedExpression[T8,_]):
     GroupByState[Product8[T1,T2,T3,T4,T5,T6,T7,T8]] =
    new GroupQueryYield[Product8[T1,T2,T3,T4,T5,T6,T7,T8]](this,
      ()=>List(e1, e2, e3, e4, e5, e6, e7, e8)
    )
}