/// <summary>
/// Gets the textual representation of the <paramref name="aggregateFunctionExpressionType"/>
/// </summary>
/// <param name="aggregateFunctionExpressionType">The <see cref="DbAggregateFunctionExpressionType"/> for which to return the textual representation.</param>
/// <returns><see cref="string"/></returns>
protected virtual string GetAggregateFunctionBody(DbAggregateFunctionExpressionType aggregateFunctionExpressionType)
{
switch (aggregateFunctionExpressionType)
{
case DbAggregateFunctionExpressionType.Avg:
return "AVG({0})";
case DbAggregateFunctionExpressionType.Count:
return "COUNT({0})";
case DbAggregateFunctionExpressionType.Max:
return "MAX({0})";
case DbAggregateFunctionExpressionType.Min:
return "MIN({0})";
case DbAggregateFunctionExpressionType.Sum:
return "SUM({0})";
default:
throw new ArgumentOutOfRangeException("aggregateFunctionExpressionType", aggregateFunctionExpressionType, " is not supported");
}
}
/// <summary>
/// Gets the textual representation of the <paramref name="aggregateFunctionExpressionType"/>
/// </summary>
/// <param name="aggregateFunctionExpressionType">The <see cref="DbAggregateFunctionExpressionType"/> for which to return the textual representation.</param>
/// <returns><see cref="string"/></returns>
protected virtual string GetAggregateFunctionBody(DbAggregateFunctionExpressionType aggregateFunctionExpressionType)
{
switch (aggregateFunctionExpressionType)
{
case DbAggregateFunctionExpressionType.Avg:
return("AVG({0})");
case DbAggregateFunctionExpressionType.Count:
return("COUNT({0})");
case DbAggregateFunctionExpressionType.Max:
return("MAX({0})");
case DbAggregateFunctionExpressionType.Min:
return("MIN({0})");
case DbAggregateFunctionExpressionType.Sum:
return("SUM({0})");
default:
throw new ArgumentOutOfRangeException("aggregateFunctionExpressionType", aggregateFunctionExpressionType, " is not supported");
}
}
private void ValidateAggregateExpression(DbAggregateFunctionExpression aggregateFunctionExpression, DbAggregateFunctionExpressionType aggregateFunctionExpressionType)
{
Assert.IsTrue(aggregateFunctionExpression.ExpressionType == DbExpressionType.Function);
Assert.IsTrue(aggregateFunctionExpression.FunctionExpressionType == DbFunctionExpressionType.Aggregate);
Assert.IsNotNull(aggregateFunctionExpression.Arguments);
Assert.IsTrue(aggregateFunctionExpression.Arguments.Length > 0);
}
private void ValidateAggregateExpression(DbAggregateFunctionExpression aggregateFunctionExpression, DbAggregateFunctionExpressionType aggregateFunctionExpressionType)
{
Assert.IsTrue(aggregateFunctionExpression.ExpressionType == DbExpressionType.Function);
Assert.IsTrue(aggregateFunctionExpression.FunctionExpressionType == DbFunctionExpressionType.Aggregate);
Assert.IsNotNull(aggregateFunctionExpression.Arguments);
Assert.IsTrue(aggregateFunctionExpression.Arguments.Length > 0);
}
/// <summary>
/// Creates a <see cref="DbAggregateFunctionExpression"/>.
/// </summary>
/// <param name="aggregateFunctionExpressionType">The <see cref="DbAggregateFunctionExpressionType"/> that specifies the type of aggregate expression to create.</param>
/// <param name="target">The <see cref="DbExpression"/> that the aggregate function operates on.</param>
/// <returns>A <see cref="DbAggregateFunctionExpression"/> instance.</returns>
public DbAggregateFunctionExpression MakeAggregateFunction(DbAggregateFunctionExpressionType aggregateFunctionExpressionType, DbExpression target)
{
var aggregateExpression = new DbAggregateFunctionExpression(aggregateFunctionExpressionType, new[] { target });
return aggregateExpression;
}
/// <summary>
/// Initializes a new instance of the <see cref="DbAggregateFunctionExpression"/> class.
/// </summary>
/// <param name="aggregateFunctionExpressionType">The <see cref="DbAggregateFunctionExpressionType"/> of the <see cref="DbAggregateFunctionExpression"/>.</param>
/// <param name="arguments">The arguments used when calling the function.</param>
internal DbAggregateFunctionExpression(DbAggregateFunctionExpressionType aggregateFunctionExpressionType, DbExpression[] arguments)
: base(DbFunctionExpressionType.Aggregate, arguments)
{
AggregateFunctionExpressionType = aggregateFunctionExpressionType;
}
/// <summary>
/// Initializes a new instance of the <see cref="DbAggregateFunctionExpression"/> class.
/// </summary>
/// <param name="aggregateFunctionExpressionType">The <see cref="DbAggregateFunctionExpressionType"/> of the <see cref="DbAggregateFunctionExpression"/>.</param>
/// <param name="arguments">The arguments used when calling the function.</param>
internal DbAggregateFunctionExpression(DbAggregateFunctionExpressionType aggregateFunctionExpressionType, DbExpression[] arguments)
: base(DbFunctionExpressionType.Aggregate, arguments)
{
AggregateFunctionExpressionType = aggregateFunctionExpressionType;
}
