CursorInfo.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.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;

using Deveel.Data.Sql.Expressions;
using Deveel.Data.Sql.Query;

namespace Deveel.Data.Sql.Cursors {
    public sealed class CursorInfo : IObjectInfo {
        public CursorInfo(string cursorName, SqlQueryExpression queryExpression) 
            : this(cursorName, CursorFlags.Insensitive, queryExpression) {
        }

        public CursorInfo(string cursorName, CursorFlags flags, SqlQueryExpression queryExpression) {
            if (cursorName == null)
                throw new ArgumentNullException("cursorName");
            if (queryExpression == null)
                throw new ArgumentNullException("queryExpression");

            CursorName = cursorName;
            QueryExpression = queryExpression;
            Parameters = new ParameterCollection();

            Flags = flags;
        }

        public string CursorName { get; private set; }

        public ICollection<CursorParameter> Parameters { get; private set; }

        public CursorFlags Flags { get; set; }

        public bool IsInsensitive {
            get { return (Flags & CursorFlags.Insensitive) != 0; }
        }


        public bool IsScroll {
            get { return (Flags & CursorFlags.Scroll) != 0; }
        }

        public SqlQueryExpression QueryExpression { get; private set; }

        DbObjectType IObjectInfo.ObjectType {
            get { return DbObjectType.Cursor; }
        }

        ObjectName IObjectInfo.FullName {
            get { return new ObjectName(CursorName); }
        }

        #region ParameterCollection

        class ParameterCollection : Collection<CursorParameter> {
            protected override void InsertItem(int index, CursorParameter item) {
                if (Items.Any(x => x.ParameterName == item.ParameterName))
                    throw new ArgumentException(String.Format("Argument '{0}' was already added to the collection.", item.ParameterName));

                if (item.Offset < 0) {
                    item.Offset = index;
                } else {
                    index = item.Offset;
                }

                base.InsertItem(index, item);
            }

            protected override void SetItem(int index, CursorParameter item) {
                item.Offset = index;
                base.SetItem(index, item);
            }
        }

        #endregion
    }
}