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//---------------------------------------------------------------------
// <copyright file="ExternalCalls.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
using System.Data.Mapping.ViewGeneration.Structures;
using System.Data.Common;
using System.Data.Common.CommandTrees;
using System.Data.Common.CommandTrees.ExpressionBuilder;
using System.Data.Common.EntitySql;
using System.Data.Common.Utils;
using System.Data.Metadata.Edm;
using System.Diagnostics;
using System.Collections.Generic;
using System.Linq;
namespace System.Data.Mapping.ViewGeneration.Utils
{
/// <summary>
/// This class encapsulates "external" calls from view/MDF generation to other System.Data.Entity features.
/// </summary>
internal static class ExternalCalls
{
static internal bool IsReservedKeyword(string name)
{
return CqlLexer.IsReservedKeyword(name);
}
static internal DbCommandTree CompileView(
string viewDef,
StorageMappingItemCollection mappingItemCollection,
ParserOptions.CompilationMode compilationMode)
{
Debug.Assert(!String.IsNullOrEmpty(viewDef), "!String.IsNullOrEmpty(viewDef)");
Debug.Assert(mappingItemCollection != null, "mappingItemCollection != null");
Perspective perspective = new TargetPerspective(mappingItemCollection.Workspace);
ParserOptions parserOptions = new ParserOptions();
parserOptions.ParserCompilationMode = compilationMode;
DbCommandTree expr = CqlQuery.Compile(viewDef, perspective, parserOptions, null).CommandTree;
Debug.Assert(expr != null, "Compile returned empty tree?");
return expr;
}
static internal DbExpression CompileFunctionView(
string viewDef,
StorageMappingItemCollection mappingItemCollection,
ParserOptions.CompilationMode compilationMode,
IEnumerable<DbParameterReferenceExpression> parameters)
{
Debug.Assert(!String.IsNullOrEmpty(viewDef), "!String.IsNullOrEmpty(viewDef)");
Debug.Assert(mappingItemCollection != null, "mappingItemCollection != null");
Perspective perspective = new TargetPerspective(mappingItemCollection.Workspace);
ParserOptions parserOptions = new ParserOptions();
parserOptions.ParserCompilationMode = compilationMode;
// Parameters have to be accessible in the body as regular scope variables, not as command parameters.
// Hence compile view as lambda with parameters as lambda vars, then invoke the lambda specifying
// command parameters as values of the lambda vars.
DbLambda functionBody = CqlQuery.CompileQueryCommandLambda(
viewDef,
perspective,
parserOptions,
null /* parameters */,
parameters.Select(pInfo => pInfo.ResultType.Variable(pInfo.ParameterName)));
Debug.Assert(functionBody != null, "functionBody != null");
DbExpression expr = functionBody.Invoke(parameters);
return expr;
}
/// <summary>
/// Compiles eSQL <paramref name="functionDefinition"/> and returns <see cref="DbLambda"/>.
/// Guarantees type match of lambda variables and <paramref name="functionParameters"/>.
/// Passes thru all excepions coming from <see cref="CqlQuery"/>.
/// </summary>
static internal DbLambda CompileFunctionDefinition(
string functionFullName,
string functionDefinition,
IList<FunctionParameter> functionParameters,
EdmItemCollection edmItemCollection)
{
Debug.Assert(!String.IsNullOrEmpty(functionFullName), "!String.IsNullOrEmpty(functionFullName)");
Debug.Assert(!String.IsNullOrEmpty(functionDefinition), "!String.IsNullOrEmpty(functionDefinition)");
Debug.Assert(functionParameters != null, "functionParameters != null");
Debug.Assert(edmItemCollection != null, "edmItemCollection != null");
MetadataWorkspace workspace = new MetadataWorkspace();
workspace.RegisterItemCollection(edmItemCollection);
Perspective perspective = new ModelPerspective(workspace);
// Since we compile lambda expression and generate variables from the function parameter definitions,
// the returned DbLambda will contain variable types that match function parameter types.
DbLambda functionBody = CqlQuery.CompileQueryCommandLambda(
functionDefinition,
perspective,
null /* use default parser options */,
null /* parameters */,
functionParameters.Select(pInfo => pInfo.TypeUsage.Variable(pInfo.Name)));
Debug.Assert(functionBody != null, "functionBody != null");
return functionBody;
}
}
}
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