VersionedTableIndexList.cs

Go to the documentation of this file.

// 
//  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.Linq;

using Deveel.Data.Sql;

namespace Deveel.Data.Sql.Tables {
    class VersionedTableIndexList {
        private readonly List<TableEventRegistry> eventRegistries;
 
        public VersionedTableIndexList(TableSource tableSource) {
            TableSource = tableSource;

            eventRegistries = new List<TableEventRegistry>();
        }

        public IDatabaseContext DatabaseContext {
            get { return TableSource.DatabaseContext; }
        }

        public TableSource TableSource { get; private set; }

        public bool HasChangesPending {
            get { return eventRegistries.Any(); }
        }

        public void AddRegistry(TableEventRegistry registry) {
            eventRegistries.Add(registry);
        }

        public bool MergeChanges(long commitId) {
            // TODO: report the stat to the system

            while (eventRegistries.Count > 0) {
                var registry = eventRegistries[0];

                if (commitId > registry.CommitId) {
                    // Remove the top registry from the list.
                    eventRegistries.RemoveAt(0);
                } else {
                    return false;
                }
            }

            return true;
        }

        public IEnumerable<TableEventRegistry> FindSinceCommit(long commitId) {
            return eventRegistries.Where(x => x.CommitId >= commitId);
        }
    }
}