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FunctionReference.cs
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197 lines (172 loc) · 8.13 KB
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using System.Collections.Generic;
namespace Simple.Data
{
using System;
using System.Linq;
using Commands;
public class FunctionReference : SimpleReference, IEquatable<FunctionReference>
{
private static readonly HashSet<string> KnownFunctionNames = new HashSet<string>
{
"min", "max", "average", "length", "sum", "count",
};
private static readonly HashSet<string> AggregateFunctionNames = new HashSet<string>
{
"min", "max", "average", "sum", "count",
};
private readonly string _name;
private readonly SimpleReference _argument;
private readonly object[] _additionalArguments;
private readonly bool _isAggregate;
internal FunctionReference(string name, SimpleReference argument, params object[] additionalArguments)
{
_name = name;
_argument = argument;
_additionalArguments = additionalArguments;
_isAggregate = AggregateFunctionNames.Contains(name.ToLowerInvariant());
}
private FunctionReference(string name, SimpleReference argument, bool isAggregate, string alias, params object[] additionalArguments) : base(alias)
{
_name = name;
_argument = argument;
_isAggregate = isAggregate;
_additionalArguments = additionalArguments;
}
public IEnumerable<object> AdditionalArguments
{
get { return _additionalArguments.AsEnumerable(); }
}
public FunctionReference As(string alias)
{
return new FunctionReference(_name, _argument, _isAggregate, alias, _additionalArguments);
}
public override string GetAliasOrName()
{
return GetAlias() ?? _name + "_" + _argument.GetAliasOrName();
}
public bool IsAggregate
{
get { return _isAggregate; }
}
public string Name
{
get { return _name; }
}
public SimpleReference Argument
{
get { return _argument; }
}
public static bool TryCreate(string name, SimpleReference argument, out object functionReference)
{
if (!KnownFunctionNames.Contains(name.ToLowerInvariant()))
{
functionReference = null;
return false;
}
functionReference = new FunctionReference(name, argument);
return true;
}
/// <summary>
/// Implements the operator == to create a <see cref="SimpleExpression"/> with the type <see cref="SimpleExpressionType.Equal"/>.
/// </summary>
/// <param name="column">The column.</param>
/// <param name="value">The value.</param>
/// <returns>The expression.</returns>
public static SimpleExpression operator ==(FunctionReference column, object value)
{
return new SimpleExpression(column, value, SimpleExpressionType.Equal);
}
/// <summary>
/// Implements the operator != to create a <see cref="SimpleExpression"/> with the type <see cref="SimpleExpressionType.NotEqual"/>.
/// </summary>
/// <param name="column">The column.</param>
/// <param name="value">The value.</param>
/// <returns>The expression.</returns>
public static SimpleExpression operator !=(FunctionReference column, object value)
{
return new SimpleExpression(column, value, SimpleExpressionType.NotEqual);
}
/// <summary>
/// Implements the operator < to create a <see cref="SimpleExpression"/> with the type <see cref="SimpleExpressionType.LessThan"/>.
/// </summary>
/// <param name="column">The column.</param>
/// <param name="value">The value.</param>
/// <returns>The expression.</returns>
public static SimpleExpression operator <(FunctionReference column, object value)
{
return new SimpleExpression(column, value, SimpleExpressionType.LessThan);
}
/// <summary>
/// Implements the operator > to create a <see cref="SimpleExpression"/> with the type <see cref="SimpleExpressionType.GreaterThan"/>.
/// </summary>
/// <param name="column">The column.</param>
/// <param name="value">The value.</param>
/// <returns>The expression.</returns>
public static SimpleExpression operator >(FunctionReference column, object value)
{
return new SimpleExpression(column, value, SimpleExpressionType.GreaterThan);
}
/// <summary>
/// Implements the operator <= to create a <see cref="SimpleExpression"/> with the type <see cref="SimpleExpressionType.LessThanOrEqual"/>.
/// </summary>
/// <param name="column">The column.</param>
/// <param name="value">The value.</param>
/// <returns>The expression.</returns>
public static SimpleExpression operator <=(FunctionReference column, object value)
{
return new SimpleExpression(column, value, SimpleExpressionType.LessThanOrEqual);
}
/// <summary>
/// Implements the operator >= to create a <see cref="SimpleExpression"/> with the type <see cref="SimpleExpressionType.GreaterThanOrEqual"/>.
/// </summary>
/// <param name="column">The column.</param>
/// <param name="value">The value.</param>
/// <returns>The expression.</returns>
public static SimpleExpression operator >=(FunctionReference column, object value)
{
return new SimpleExpression(column, value, SimpleExpressionType.GreaterThanOrEqual);
}
public bool Equals(FunctionReference other)
{
if (ReferenceEquals(null, other)) return false;
if (ReferenceEquals(this, other)) return true;
return Equals(other._name, _name) && Equals(other._argument, _argument) && other._isAggregate.Equals(_isAggregate) && Equals(other.GetAlias(), GetAlias());
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
if (ReferenceEquals(this, obj)) return true;
if (obj.GetType() != typeof (FunctionReference)) return false;
return Equals((FunctionReference) obj);
}
public override int GetHashCode()
{
unchecked
{
int result = (_name != null ? _name.GetHashCode() : 0);
result = (result*397) ^ (_argument != null ? _argument.GetHashCode() : 0);
result = (result*397) ^ _isAggregate.GetHashCode();
result = (result*397) ^ (GetAlias() != null ? GetAlias().GetHashCode() : 0);
return result;
}
}
public override bool TryInvokeMember(System.Dynamic.InvokeMemberBinder binder, object[] args, out object result)
{
if (base.TryInvokeMember(binder, args, out result)) return true;
var dataStrategy = _argument.FindDataStrategyInHierarchy();
if (dataStrategy != null)
{
if (dataStrategy.IsExpressionFunction(binder.Name, args))
{
result = new SimpleExpression(this, new SimpleFunction(binder.Name, args), SimpleExpressionType.Function);
}
else
{
result = new FunctionReference(binder.Name, this, args);
}
return true;
}
return false;
}
}
}