[a5a9f1]: System.Data.SQLite.Linq / SQL Generation / SqlChecker.cs Maximize Restore History

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/********************************************************
* ADO.NET 2.0 Data Provider for SQLite Version 3.X
* Written by Robert Simpson (robert@blackcastlesoft.com)
*
* Released to the public domain, use at your own risk!
********************************************************/
namespace System.Data.SQLite
{
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common.CommandTrees;
using System.Data.Entity;
using System.Runtime.CompilerServices;
internal class SqlChecker : DbExpressionVisitor<bool>
{
private static Type sql8rewriter;
static SqlChecker()
{
sql8rewriter = Type.GetType("System.Data.SqlClient.SqlGen.Sql8ExpressionRewriter, System.Data.Entity, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089", false);
}
private SqlChecker()
{
}
/// <summary>
/// SQLite doesn't support things like SKIP and a few other things. So determine if the query has to be rewritten
/// </summary>
/// <remarks>
/// Microsoft went to all the trouble of making things like SKIP work on Sql Server 2000 by doing a rewrite of the commandtree.
/// However, all that fancy stuff is hidden from us. Thanks to reflection however, we can go ahead and use the Sql 2000 rewriter code
/// they made.
/// </remarks>
/// <param name="tree">The tree to inspect for a rewrite</param>
/// <returns>Returns a new query tree if it needs rewriting</returns>
internal static DbQueryCommandTree Rewrite(DbQueryCommandTree tree)
{
SqlChecker visitor = new SqlChecker();
if (tree.Query.Accept<bool>(visitor))
{
tree = sql8rewriter.InvokeMember("Rewrite", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Static, null, null, new object[] { tree }) as DbQueryCommandTree;
}
return tree;
}
public override bool Visit(DbAndExpression expression)
{
return VisitBinaryExpression(expression);
}
public override bool Visit(DbApplyExpression expression)
{
throw new NotSupportedException("apply expression");
}
public override bool Visit(DbArithmeticExpression expression)
{
return VisitExpressionList(expression.Arguments);
}
public override bool Visit(DbCaseExpression expression)
{
bool flag1 = VisitExpressionList(expression.When);
bool flag2 = VisitExpressionList(expression.Then);
bool flag3 = VisitExpression(expression.Else);
return (flag1 || flag2 || flag3);
}
public override bool Visit(DbCastExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbComparisonExpression expression)
{
return VisitBinaryExpression(expression);
}
public override bool Visit(DbConstantExpression expression)
{
return false;
}
public override bool Visit(DbCrossJoinExpression expression)
{
return VisitExpressionBindingList(expression.Inputs);
}
public override bool Visit(DbDerefExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbDistinctExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbElementExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbEntityRefExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbExceptExpression expression)
{
VisitExpression(expression.Left);
VisitExpression(expression.Right);
return true;
}
public override bool Visit(DbExpression expression)
{
throw new NotSupportedException(expression.GetType().FullName);
}
public override bool Visit(DbFilterExpression expression)
{
bool flag1 = VisitExpressionBinding(expression.Input);
bool flag2 = VisitExpression(expression.Predicate);
return (flag1 || flag2);
}
public override bool Visit(DbFunctionExpression expression)
{
return VisitExpressionList(expression.Arguments);
}
public override bool Visit(DbGroupByExpression expression)
{
bool flag1 = VisitExpression(expression.Input.Expression);
bool flag2 = VisitExpressionList(expression.Keys);
bool flag3 = VisitAggregateList(expression.Aggregates);
return (flag1 || flag2 || flag3);
}
public override bool Visit(DbIntersectExpression expression)
{
VisitExpression(expression.Left);
VisitExpression(expression.Right);
return true;
}
public override bool Visit(DbIsEmptyExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbIsNullExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbIsOfExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbJoinExpression expression)
{
bool flag1 = VisitExpressionBinding(expression.Left);
bool flag2 = VisitExpressionBinding(expression.Right);
bool flag3 = VisitExpression(expression.JoinCondition);
return (flag1 || flag2 || flag3);
}
public override bool Visit(DbLikeExpression expression)
{
bool flag1 = VisitExpression(expression.Argument);
bool flag2 = VisitExpression(expression.Pattern);
bool flag3 = VisitExpression(expression.Escape);
return (flag1 || flag2 || flag3);
}
public override bool Visit(DbLimitExpression expression)
{
return VisitExpression(expression.Argument);
}
public override bool Visit(DbNewInstanceExpression expression)
{
return VisitExpressionList(expression.Arguments);
}
public override bool Visit(DbNotExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbNullExpression expression)
{
return false;
}
public override bool Visit(DbOfTypeExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbOrExpression expression)
{
return VisitBinaryExpression(expression);
}
public override bool Visit(DbParameterReferenceExpression expression)
{
return false;
}
public override bool Visit(DbProjectExpression expression)
{
bool flag1 = VisitExpressionBinding(expression.Input);
bool flag2 = VisitExpression(expression.Projection);
return (flag1 || flag2);
}
public override bool Visit(DbPropertyExpression expression)
{
return VisitExpression(expression.Instance);
}
public override bool Visit(DbQuantifierExpression expression)
{
bool flag1 = VisitExpressionBinding(expression.Input);
bool flag2 = VisitExpression(expression.Predicate);
return (flag1 || flag2);
}
public override bool Visit(DbRefExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbRefKeyExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbRelationshipNavigationExpression expression)
{
return VisitExpression(expression.NavigationSource);
}
public override bool Visit(DbScanExpression expression)
{
return false;
}
public override bool Visit(DbSkipExpression expression)
{
VisitExpressionBinding(expression.Input);
VisitSortClauseList(expression.SortOrder);
VisitExpression(expression.Count);
return true;
}
public override bool Visit(DbSortExpression expression)
{
bool flag1 = VisitExpressionBinding(expression.Input);
bool flag2 = VisitSortClauseList(expression.SortOrder);
return (flag1 || flag2);
}
public override bool Visit(DbTreatExpression expression)
{
return VisitUnaryExpression(expression);
}
public override bool Visit(DbUnionAllExpression expression)
{
return VisitBinaryExpression(expression);
}
public override bool Visit(DbVariableReferenceExpression expression)
{
return false;
}
private bool VisitAggregate(DbAggregate aggregate)
{
return VisitExpressionList(aggregate.Arguments);
}
private bool VisitAggregateList(IList<DbAggregate> list)
{
return VisitList<DbAggregate>(new ListElementHandler<DbAggregate>(VisitAggregate), list);
}
private bool VisitBinaryExpression(DbBinaryExpression expr)
{
bool flag1 = VisitExpression(expr.Left);
bool flag2 = VisitExpression(expr.Right);
return (flag1 || flag2);
}
private bool VisitExpression(DbExpression expression)
{
if (expression == null)
{
return false;
}
return expression.Accept<bool>(this);
}
private bool VisitExpressionBinding(DbExpressionBinding expressionBinding)
{
return VisitExpression(expressionBinding.Expression);
}
private bool VisitExpressionBindingList(IList<DbExpressionBinding> list)
{
return VisitList<DbExpressionBinding>(new ListElementHandler<DbExpressionBinding>(VisitExpressionBinding), list);
}
private bool VisitExpressionList(IList<DbExpression> list)
{
return VisitList<DbExpression>(new ListElementHandler<DbExpression>(VisitExpression), list);
}
private static bool VisitList<TElementType>(ListElementHandler<TElementType> handler, IList<TElementType> list)
{
bool flag = false;
foreach (TElementType local in list)
{
bool flag2 = handler(local);
flag = flag || flag2;
}
return flag;
}
private bool VisitSortClause(DbSortClause sortClause)
{
return VisitExpression(sortClause.Expression);
}
private bool VisitSortClauseList(IList<DbSortClause> list)
{
return VisitList<DbSortClause>(new ListElementHandler<DbSortClause>(VisitSortClause), list);
}
private bool VisitUnaryExpression(DbUnaryExpression expr)
{
return VisitExpression(expr.Argument);
}
private delegate bool ListElementHandler<TElementType>(TElementType element);
}
}