ViewgenGatekeeper.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Map / ViewGeneration / ViewgenGatekeeper.cs / 1305376 / ViewgenGatekeeper.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System.Data.Common.Utils; 
using System.Data.Common.Utils.Boolean;
using System.Data.Mapping.ViewGeneration.Structures;
using System.Data.Mapping.ViewGeneration.Validation;
using System.Data.Mapping.ViewGeneration.QueryRewriting; 
using System.Collections.Generic;
using System.Text; 
using System.Diagnostics; 
using System.Data.Mapping.ViewGeneration.Utils;
using System.Data.Metadata.Edm; 
using System.Linq;

namespace System.Data.Mapping.ViewGeneration
{ 

    using ViewSet = KeyToListMap; 
    using CellGroup = Set; 
    using WrapperBoolExpr = BoolExpr;
    using WrapperTrueExpr = TrueExpr; 
    using WrapperFalseExpr = FalseExpr;
    using WrapperNotExpr = NotExpr;
    using WrapperOrExpr = OrExpr;
 
    abstract internal class ViewgenGatekeeper : InternalBase
    { 
 
        /// 
        /// Entry point for View Generation 
        /// 
        /// 
        /// 
        ///  
        /// Generated Views for EntitySets
        internal static ViewGenResults GenerateViewsFromMapping(StorageEntityContainerMapping containerMapping, ConfigViewGenerator config) 
        { 

            EntityUtil.CheckArgumentNull(containerMapping, "containerMapping"); 
            EntityUtil.CheckArgumentNull(config, "config");
            Debug.Assert(!containerMapping.IsEmpty, "Precondition Violated: No mapping exists to generate viws for!");

            //Create Cells from StorageEntityContainerMapping 
            CellCreator cellCreator = new CellCreator(containerMapping);
            List cells = cellCreator.GenerateCells(config); 
            CqlIdentifiers identifiers = cellCreator.Identifiers; 

            return GenerateViewsFromCells(cells, config, identifiers, containerMapping); 
        }

        /// 
        /// Entry point for Type specific generation of Query Views 
        /// 
        internal static ViewGenResults GenerateTypeSpecificQueryView(StorageEntityContainerMapping containerMapping, 
                                                              ConfigViewGenerator config, 
                                                              EntitySetBase entity,
                                                              EntityTypeBase type, 
                                                              bool includeSubtypes,
                                                              out bool success)
        {
            EntityUtil.CheckArgumentNull(containerMapping, "containerMapping"); 
            EntityUtil.CheckArgumentNull(config, "config");
            EntityUtil.CheckArgumentNull(entity, "entity"); 
            EntityUtil.CheckArgumentNull(type, "type"); 
            Debug.Assert(!type.Abstract, "Can not generate OfType/OfTypeOnly query view for and abstract type");
 
            if (config.IsNormalTracing)
            {
                Helpers.StringTraceLine("");
                Helpers.StringTraceLine("<<<<<<<< Generating Query View for Entity [" + entity.Name + "] OfType" + (includeSubtypes ? "" : "Only") + "(" + type.Name + ") >>>>>>>"); 
            }
 
            if (containerMapping.GetEntitySetMapping(entity.Name).QueryView != null) 
            {
                //Type-specific QV does not exist in the cache, but 
                // there is a EntitySet QV. So we can't generate the view (no mapping exists for this EntitySet)
                // and we rely on Query to call us again to get the EntitySet View.
                success = false;
                return null; 
            }
 
            //Compute Cell Groups or get it from Memoizer 
            InputForComputingCellGroups args = new InputForComputingCellGroups(containerMapping, config);
            OutputFromComputeCellGroups result = containerMapping.GetCellgroups(args); 
            success = result.Success;

            if (!success)
            { 
                return null;
            } 
 
            List foreignKeyConstraints = result.ForeignKeyConstraints;
            // Get a Clone of cell groups from cache since cells are modified during viewgen, and we dont want the cached copy to change 
            List cellGroups = cellGroups = result.CellGroups.Select(setOfcells => new CellGroup(setOfcells.Select(cell => new Cell(cell)))).ToList();
            List cells = result.Cells;
            CqlIdentifiers identifiers = result.Identifiers;
 

            ViewGenResults viewGenResults = new ViewGenResults(); 
            ErrorLog tmpLog = EnsureAllCSpaceContainerSetsAreMapped(cells, config, containerMapping); 
            if (tmpLog.Count > 0)
            { 
                viewGenResults.AddErrors(tmpLog);
                Helpers.StringTraceLine(viewGenResults.ErrorsToString());
                success = true; //atleast we tried successfully
                return viewGenResults; 
            }
 
            foreach (CellGroup cellGroup in cellGroups) 
            {
                if (!DoesCellGroupContainEntitySet(cellGroup, entity)) 
                {
                    continue;
                }
 
                ViewGenerator viewGenerator = null;
                ErrorLog groupErrorLog = new ErrorLog(); 
                try 
                {
                    viewGenerator = new ViewGenerator(cellGroup, config, foreignKeyConstraints, containerMapping); 
                }
                catch (InternalMappingException exception)
                {
                    // All exceptions have mapping errors in them 
                    Debug.Assert(exception.ErrorLog.Count > 0, "Incorrectly created mapping exception");
                    groupErrorLog = exception.ErrorLog; 
                } 

                if (groupErrorLog.Count > 0) 
                {
                    break;
                }
                Debug.Assert(viewGenerator != null); //make sure there is no exception thrown that does not add error to log 

                ViewGenerationMode mode = includeSubtypes ? ViewGenerationMode.OfTypeViews : ViewGenerationMode.OfTypeOnlyViews; 
 
                groupErrorLog = viewGenerator.GenerateQueryViewForSingleExtent(viewGenResults.Views, identifiers, entity, type, mode);
 
                if (groupErrorLog.Count != 0)
                {
                    viewGenResults.AddErrors(groupErrorLog);
                } 
            }
 
            success = true; 
            return viewGenResults;
        } 


        // effects: Given a list of cells in the schema, generates the query and
        // update mapping views for OFTYPE(Extent, Type) combinations in this schema 
        // container. Returns a list of generated query and update views.
        // If it is false and some columns in a table are unmapped, an 
        // exception is raised 
        private static ViewGenResults GenerateViewsFromCells(List cells, ConfigViewGenerator config,
                                                                   CqlIdentifiers identifiers, 
                                                                   StorageEntityContainerMapping containerMapping)
        {
            EntityUtil.CheckArgumentNull(cells, "cells");
            EntityUtil.CheckArgumentNull(config, "config"); 
            Debug.Assert(cells.Count > 0, "There must be at least one cell in the container mapping");
 
 
            // Go through each table and determine their foreign key constraints
            EntityContainer container = containerMapping.StorageEntityContainer; 
            Debug.Assert(container != null);

            ViewGenResults viewGenResults = new ViewGenResults();
            ErrorLog tmpLog = EnsureAllCSpaceContainerSetsAreMapped(cells, config, containerMapping); 
            if (tmpLog.Count > 0)
            { 
                viewGenResults.AddErrors(tmpLog); 
                Helpers.StringTraceLine(viewGenResults.ErrorsToString());
                return viewGenResults; 
            }

            List foreignKeyConstraints = ForeignConstraint.GetForeignConstraints(container);
 
            CellPartitioner partitioner = new CellPartitioner(cells, foreignKeyConstraints);
            List cellGroups = partitioner.GroupRelatedCells(); 
            foreach (CellGroup cellGroup in cellGroups) 
            {
                ViewGenerator viewGenerator = null; 
                ErrorLog groupErrorLog = new ErrorLog();
                try
                {
                    viewGenerator = new ViewGenerator(cellGroup, config, foreignKeyConstraints, containerMapping); 
                }
                catch (InternalMappingException exception) 
                { 
                    // All exceptions have mapping errors in them
                    Debug.Assert(exception.ErrorLog.Count > 0, "Incorrectly created mapping exception"); 
                    groupErrorLog = exception.ErrorLog;
                }

                if (groupErrorLog.Count == 0) 
                {
                    Debug.Assert(viewGenerator != null); 
                    groupErrorLog = viewGenerator.GenerateAllBidirectionalViews(viewGenResults.Views, identifiers); 
                }
 
                if (groupErrorLog.Count != 0)
                {
                    viewGenResults.AddErrors(groupErrorLog);
                } 
            }
            // We used to print the errors here. Now we trace them as they are being thrown 
            //if (viewGenResults.HasErrors && config.IsViewTracing) { 
            //    Helpers.StringTraceLine(viewGenResults.ErrorsToString());
            //} 
            return viewGenResults;
        }

 

        // effects: Given a container, ensures that all entity/association 
        // sets in container on the C-side have been mapped 
        private static ErrorLog EnsureAllCSpaceContainerSetsAreMapped(IEnumerable cells,
                                                                      ConfigViewGenerator config, 
                                                                      StorageEntityContainerMapping containerMapping)
        {

            Set mappedExtents = new Set(); 
            string mslFileLocation = null;
            EntityContainer container = null; 
            // Determine the container and name of the file while determining 
            // the set of mapped extents in the cells
            foreach (Cell cell in cells) 
            {
                mappedExtents.Add(cell.CQuery.Extent);
                mslFileLocation = cell.CellLabel.SourceLocation;
                // All cells are from the same container 
                container = cell.CQuery.Extent.EntityContainer;
            } 
            Debug.Assert(container != null); 

            List missingExtents = new List(); 
            // Go through all the extents in the container and determine
            // extents that are missing
            foreach (EntitySetBase extent in container.BaseEntitySets)
            { 
                if (mappedExtents.Contains(extent) == false
                    && !(containerMapping.HasQueryViewForSetMap(extent.Name))) 
                { 
                    AssociationSet associationSet = extent as AssociationSet;
                    if (associationSet==null || !associationSet.ElementType.IsForeignKey) 
                    {
                        missingExtents.Add(extent);
                    }
                } 
            }
            ErrorLog errorLog = new ErrorLog(); 
            // If any extent is not mapped, add an error 
            if (missingExtents.Count > 0)
            { 
                StringBuilder extentBuilder = new StringBuilder();
                bool isFirst = true;
                foreach (EntitySetBase extent in missingExtents)
                { 
                    if (isFirst == false)
                    { 
                        extentBuilder.Append(", "); 
                    }
                    isFirst = false; 
                    extentBuilder.Append(extent.Name);
                }
                string message = System.Data.Entity.Strings.ViewGen_Missing_Set_Mapping_0(extentBuilder);
                // Find the cell with smallest line number - so that we can 
                // point to the beginning of the file
                int lowestLineNum = -1; 
                Cell smallestCell = null; 
                foreach (Cell cell in cells)
                { 
                    if (lowestLineNum == -1 || cell.CellLabel.StartLineNumber < lowestLineNum)
                    {
                        smallestCell = cell;
                        lowestLineNum = cell.CellLabel.StartLineNumber; 
                    }
                } 
                Debug.Assert(smallestCell != null && lowestLineNum >= 0); 
                EdmSchemaError edmSchemaError = new EdmSchemaError(message, (int)ViewGenErrorCode.MissingExtentMapping,
                    EdmSchemaErrorSeverity.Error, containerMapping.SourceLocation, containerMapping.StartLineNumber, 
                    containerMapping.StartLinePosition, null);
                ErrorLog.Record record = new ErrorLog.Record(edmSchemaError);
                errorLog.AddEntry(record);
            } 
            return errorLog;
        } 
 

 



 
        #region Static Helpers
        private static bool DoesCellGroupContainEntitySet(CellGroup group, EntitySetBase entity) 
        { 
            foreach (Cell cell in group)
            { 
                if (cell.GetLeftQuery(ViewTarget.QueryView).Extent.Equals(entity))
                {
                    return true;
                } 
            }
 
            return false; 
        }
        #endregion 

        internal override void ToCompactString(StringBuilder builder)
        {
 
        }
 
 
    }
 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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