ConditionalFragment.cs

using NHibernate.Util;

namespace NHibernate.SqlCommand
{
	/// <summary></summary>
	public class ConditionalFragment
	{
		private string tableAlias;
		private string[] lhs;
		private object[] rhs;
		private string op = "=";

		/// <summary>
		/// Sets the op
		/// </summary>
		/// <param name="op">The op to set</param>
		public ConditionalFragment SetOp(string op)
		{
			this.op = op;
			return this;
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="tableAlias"></param>
		/// <returns></returns>
		public ConditionalFragment SetTableAlias(string tableAlias)
		{
			this.tableAlias = tableAlias;
			return this;
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="lhs"></param>
		/// <param name="rhs"></param>
		/// <returns></returns>
		public ConditionalFragment SetCondition(string[] lhs, string[] rhs)
		{
			this.lhs = lhs;
			this.rhs = rhs;
			return this;
		}

		public ConditionalFragment SetCondition(string[] lhs, Parameter[] rhs)
		{
			this.lhs = lhs;
			this.rhs = rhs;
			return this;
		}

		/// <summary>
		/// 
		/// </summary>
		/// <param name="lhs"></param>
		/// <param name="rhs"></param>
		/// <returns></returns>
		public ConditionalFragment SetCondition(string[] lhs, string rhs)
		{
			this.lhs = lhs;
			this.rhs = ArrayHelper.Fill(rhs, lhs.Length);
			return this;
		}

		/// <summary></summary>
		public SqlString ToSqlStringFragment()
		{
			SqlStringBuilder buf = new SqlStringBuilder(lhs.Length * 4);
			string prefix = tableAlias + StringHelper.Dot;
			for (int i = 0; i < lhs.Length; i++)
			{
				buf.Add(prefix)
					.Add(lhs[i] + op);

				buf.AddObject(rhs[i]);

				if (i < lhs.Length - 1)
				{
					buf.Add(" and ");
				}
			}
			return buf.ToSqlString();
		}
	}
}