/
QueryPlanEqualsWithIndex.cs
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/
QueryPlanEqualsWithIndex.cs
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/*
* sones GraphDB - Community Edition - http://www.sones.com
* Copyright (C) 2007-2011 sones GmbH
*
* This file is part of sones GraphDB Community Edition.
*
* sones GraphDB is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, version 3 of the License.
*
* sones GraphDB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with sones GraphDB. If not, see <http://www.gnu.org/licenses/>.
*
*/
using System.Collections.Generic;
using sones.Library.PropertyHyperGraph;
using System;
using sones.Library.Commons.VertexStore;
using sones.GraphDB.TypeSystem;
using sones.GraphDB.Manager.Index;
using sones.Library.Commons.Security;
using sones.Library.Commons.Transaction;
using sones.Plugins.Index.Interfaces;
using System.Linq;
using sones.GraphDB.Expression.Tree.Literals;
namespace sones.GraphDB.Expression.QueryPlan
{
/// <summary>
/// An equals operation using indices
/// </summary>
public sealed class QueryPlanEqualsWithIndex : AComparativeIndexOperator, IQueryPlan
{
#region constructor
/// <summary>
/// Creates a new queryplan that processes an equals operation using indices
/// </summary>
/// <param name="mySecurityToken">The current security token</param>
/// <param name="myTransactionToken">The current transaction token</param>
/// <param name="myProperty">The interesting property</param>
/// <param name="myConstant">The constant value</param>
/// <param name="myVertexStore">The vertex store that is needed to load the vertices</param>
/// <param name="myIsLongrunning">Determines whether it is anticipated that the request could take longer</param>
public QueryPlanEqualsWithIndex(SecurityToken mySecurityToken, TransactionToken myTransactionToken, QueryPlanProperty myProperty, ILiteralExpression myConstant, IVertexStore myVertexStore, Boolean myIsLongrunning, IIndexManager myIndexManager)
:base(myProperty, myConstant, myIsLongrunning, mySecurityToken, myTransactionToken, myIndexManager, myVertexStore)
{
}
#endregion
#region IQueryPlan Members
public IEnumerable<IVertex> Execute()
{
return Execute_protected(_property.VertexType);
}
#endregion
#region overrides
public override IIndex<IComparable, long> GetBestMatchingIdx(IEnumerable<IIndex<IComparable, long>> myIndexCollection)
{
return myIndexCollection.First();
}
public override IEnumerable<long> GetSingleIndexValues(ISingleValueIndex<IComparable, long> mySingleValueIndex, IComparable myIComparable)
{
if (mySingleValueIndex.ContainsKey(myIComparable))
{
yield return mySingleValueIndex[myIComparable];
}
yield break;
}
public override IEnumerable<long> GetMultipleIndexValues(IMultipleValueIndex<IComparable, long> myMultipleValueIndex, IComparable myIComparable)
{
if (myMultipleValueIndex.ContainsKey(myIComparable))
{
return myMultipleValueIndex[myIComparable];
}
return Enumerable.Empty<long>();
}
#endregion
}
}