Enumerable.Repeat(xxx, 1) replaced with .Append/EnumerableUtils.One

Author: alex-kulakov

Orm/Xtensive.Orm/Orm/Providers/MultidatabaseMappingResolver.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2014 Xtensive LLC.
+// Copyright (C) 2014 Xtensive LLC.
 // All rights reserved.
 // For conditions of distribution and use, see license.
 // Created by: Denis Krjuchkov
@@ -87,8 +87,7 @@ from rule in configuration.MappingRules
         where db==database
         select string.IsNullOrEmpty(rule.Schema) ? configuration.DefaultSchema : rule.Schema;
 
-      return userSchemas
-        .Concat(Enumerable.Repeat(configuration.DefaultSchema, 1))
+      return userSchemas.Append(configuration.DefaultSchema)
         .Distinct();
     }
 
@@ -97,7 +96,7 @@ private static IEnumerable<string> GetDatabases(DomainConfiguration configuratio
       return configuration.MappingRules
         .Select(r => r.Database)
         .Where(db => !string.IsNullOrEmpty(db))
-        .Concat(Enumerable.Repeat(configuration.DefaultDatabase, 1))
+        .Append(configuration.DefaultDatabase)
         .Distinct();
     }
 

Orm/Xtensive.Orm/Orm/Providers/MultischemaMappingResolver.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2014 Xtensive LLC.
+// Copyright (C) 2014 Xtensive LLC.
 // All rights reserved.
 // For conditions of distribution and use, see license.
 // Created by: Denis Krjuchkov
@@ -7,6 +7,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Xtensive.Collections;
 using Xtensive.Orm.Configuration;
 using Xtensive.Orm.Upgrade;
 using Xtensive.Sql;
@@ -54,7 +55,7 @@ public override IEnumerable<SqlExtractionTask> GetSchemaTasks()
 
     public override IEnumerable<SqlExtractionTask> GetMetadataTasks()
     {
-      return Enumerable.Repeat(metadataTask, 1);
+      return EnumerableUtils.One(metadataTask);
     }
 
     private string FormatNodeName(string mappingSchema, string mappingName)
@@ -74,7 +75,7 @@ public MultischemaMappingResolver(DomainConfiguration configuration, NodeConfigu
       extractionTasks = configuration.MappingRules
         .Select(r => r.Schema)
         .Where(s => !string.IsNullOrEmpty(s))
-        .Concat(Enumerable.Repeat(configuration.DefaultSchema, 1))
+        .Append(configuration.DefaultSchema)
         .Distinct()
         .Select(s => new SqlExtractionTask(defaultSchemaInfo.Database, schemaMapping.Apply(s)))
         .ToList();

Orm/Xtensive.Orm/Orm/Providers/SimpleMappingResolver.cs

@@ -1,11 +1,12 @@
-// Copyright (C) 2014 Xtensive LLC.
+// Copyright (C) 2014 Xtensive LLC.
 // All rights reserved.
 // For conditions of distribution and use, see license.
 // Created by: Denis Krjuchkov
 // Created:    2014.03.13
 
 using System.Collections.Generic;
 using System.Linq;
+using Xtensive.Collections;
 using Xtensive.Orm.Upgrade;
 using Xtensive.Sql;
 using Xtensive.Sql.Info;
@@ -40,12 +41,12 @@ public override MappingResolveResult Resolve(SchemaExtractionResult model, strin
 
     public override IEnumerable<SqlExtractionTask> GetSchemaTasks()
     {
-      return Enumerable.Repeat(extractionTask, 1);
+      return EnumerableUtils.One(extractionTask);
     }
 
     public override IEnumerable<SqlExtractionTask> GetMetadataTasks()
     {
-      return Enumerable.Repeat(extractionTask, 1);
+      return EnumerableUtils.One(extractionTask);
     }
 
     // Constructors

Orm/Xtensive.Orm/Orm/Providers/SqlCompiler.Helpers.cs

@@ -16,6 +16,7 @@
 using Xtensive.Sql;
 using Xtensive.Sql.Dml;
 using Xtensive.Tuples;
+using Xtensive.Collections;
 
 namespace Xtensive.Orm.Providers
 {
@@ -28,7 +29,7 @@ protected SqlProvider CreateProvider(SqlSelect statement,
     protected SqlProvider CreateProvider(SqlSelect statement, QueryParameterBinding extraBinding,
       CompilableProvider origin, params ExecutableProvider[] sources)
     {
-      var extraBindings = extraBinding!=null ? Enumerable.Repeat(extraBinding, 1) : null;
+      var extraBindings = extraBinding!=null ? EnumerableUtils.One(extraBinding) : null;
       return CreateProvider(statement, extraBindings, origin, sources);
     }
 

Orm/Xtensive.Orm/Orm/Providers/StorageSequenceAccessor.cs

@@ -7,6 +7,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Xtensive.Collections;
 using Xtensive.Core;
 using Xtensive.IoC;
 using Xtensive.Orm.Configuration;
@@ -36,7 +37,7 @@ public Segment<long> NextBulk(SequenceInfo sequenceInfo, Session session)
 
       long hiValue = Execute(query, session);
       if (executionFromUpgrade && !hasAISettingsInMemory)
-        CleanUp(Enumerable.Repeat(sequenceInfo, 1), session);
+        CleanUp(EnumerableUtils.One(sequenceInfo), session);
 
       var increment = sequenceInfo.Increment;
       var current = hasArbitaryIncrement ? hiValue - increment : (hiValue - 1) * increment;