QueryResultColumn.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    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.
//

using System;
using System.IO;

using Deveel.Data.Sql;
using Deveel.Data.Sql.Tables;
using Deveel.Data.Types;

namespace Deveel.Data.Protocol {
    public class QueryResultColumn {
        private QueryResultColumn(string name, SqlType type, bool notNull) {
            Name = name;
            Type = type;
            IsNotNull = notNull;
            IsUnique = false;
            UniqueGroup = -1;
        }

        internal QueryResultColumn(string name, ColumnInfo columnInfo)
            : this(name, columnInfo.ColumnType, columnInfo.IsNotNull) {

        }

        public void SetUnique() {
            IsUnique = true;
        }

        public string Name { get; private set; }

        public SqlType Type { get; private set; }

        public bool IsNumericType {
            get { return (Type is NumericType); }
        }


        public int Size {
            get { return (Type is ISizeableType) ? ((ISizeableType)Type).Size : -1; }
        }

        public int Scale {
            get { return (Type is NumericType) ? ((NumericType) Type).Scale : -1; }
        }

        public bool IsNotNull { get; private set; }

        public bool IsUnique { get; private set; }

        public int UniqueGroup { get; set; }

        public bool IsAliased {
            get { return Name.StartsWith("@a"); }
        }

        public Type RuntimeType {
            get { return Type.GetRuntimeType(); }
        }

        public Type ValueType {
            get { return Type.GetObjectType(); }
        }

        public override bool Equals(Object ob) {
            var cd = (QueryResultColumn)ob;
            return (Name.Equals(cd.Name) &&
                    Type == cd.Type &&
                    Size == cd.Size &&
                    IsNotNull == cd.IsNotNull &&
                    IsUnique == cd.IsUnique &&
                    UniqueGroup == cd.UniqueGroup);
        }

        public override int GetHashCode() {
            return base.GetHashCode();
        }
    }
}