using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Simple.Data

{

/// <summary>

/// Represents an explicit join in a <see cref="SimpleQuery"/>.

/// There may be zero, one or multiple instances of this type in <see cref="SimpleQuery.Clauses"/>.

/// </summary>

public class JoinClause : SimpleQueryClauseBase

{

private readonly ObjectReference _table;

private readonly JoinType _joinType;

private readonly SimpleExpression _joinExpression;

public JoinClause(ObjectReference table, JoinType joinType) : this(table, joinType, null)

{

}

public JoinClause(ObjectReference table, SimpleExpression joinExpression) : this(table, JoinType.Inner, joinExpression)

{

}

public JoinClause(ObjectReference table, JoinType joinType, SimpleExpression joinExpression)

{

if (table == null) throw new ArgumentNullException("table");

_table = table;

_joinType = joinType;

_joinExpression = joinExpression;

}

public JoinType JoinType

{

get { return _joinType; }

}

public SimpleExpression JoinExpression

{

get { return _joinExpression; }

}

public ObjectReference Table

{

get { return _table; }

}

public string Name

{

get { return _table.GetAlias() ?? _table.GetName(); }

}

}

}