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//---------------------------------------------------------------------
// <copyright file="FragmentQuery.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner [....]
// @backupOwner [....]
//---------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.Collections.Generic;
using System.Text;
using System.Data.Common.Utils;
using System.Data.Common.Utils.Boolean;
using System.Data.Mapping.ViewGeneration.Structures;
using System.Data.Metadata.Edm;
using System.Linq;
using System.Globalization;
namespace System.Data.Mapping.ViewGeneration.QueryRewriting
{
internal class FragmentQuery : ITileQuery
{
private BoolExpression m_fromVariable; // optional
private string m_label; // optional
private HashSet<MemberPath> m_attributes;
private BoolExpression m_condition;
public HashSet<MemberPath> Attributes
{
get { return m_attributes; }
}
public BoolExpression Condition
{
get { return m_condition; }
}
public static FragmentQuery Create(BoolExpression fromVariable, CellQuery cellQuery)
{
BoolExpression whereClause = cellQuery.WhereClause;
whereClause = whereClause.MakeCopy();
whereClause.ExpensiveSimplify();
return new FragmentQuery(null /*label*/, fromVariable, new HashSet<MemberPath>(cellQuery.GetProjectedMembers()), whereClause);
}
public static FragmentQuery Create(string label, RoleBoolean roleBoolean, CellQuery cellQuery)
{
BoolExpression whereClause = cellQuery.WhereClause.Create(roleBoolean);
whereClause = BoolExpression.CreateAnd(whereClause, cellQuery.WhereClause);
//return new FragmentQuery(label, null /* fromVariable */, new HashSet<MemberPath>(cellQuery.GetProjectedMembers()), whereClause);
// don't need any attributes
whereClause = whereClause.MakeCopy();
whereClause.ExpensiveSimplify();
return new FragmentQuery(label, null /* fromVariable */, new HashSet<MemberPath>(), whereClause);
}
public static FragmentQuery Create(IEnumerable<MemberPath> attrs, BoolExpression whereClause)
{
return new FragmentQuery(null /* no name */, null /* no fromVariable*/, attrs, whereClause);
}
public static FragmentQuery Create(BoolExpression whereClause)
{
return new FragmentQuery(null /* no name */, null /* no fromVariable*/, new MemberPath[] { }, whereClause);
}
internal FragmentQuery(string label, BoolExpression fromVariable, IEnumerable<MemberPath> attrs, BoolExpression condition)
{
m_label = label;
m_fromVariable = fromVariable;
m_condition = condition;
m_attributes = new HashSet<MemberPath>(attrs);
}
public BoolExpression FromVariable
{
get { return m_fromVariable; }
}
public string Description
{
get
{
string label = m_label;
if (label == null && m_fromVariable != null)
{
label = m_fromVariable.ToString();
}
return label;
}
}
public override string ToString()
{
// attributes
StringBuilder b = new StringBuilder();
foreach (MemberPath value in this.Attributes)
{
if (b.Length > 0) { b.Append(','); }
b.Append(value.ToString());
}
if (Description != null && Description != b.ToString())
{
return String.Format(CultureInfo.InvariantCulture, "{0}: [{1} where {2}]", Description, b, this.Condition);
}
else
{
return String.Format(CultureInfo.InvariantCulture, "[{0} where {1}]", b, this.Condition);
}
}
#region Static methods
// creates a condition member=value
internal static BoolExpression CreateMemberCondition(MemberPath path, Constant domainValue, MemberDomainMap domainMap)
{
if (domainValue is TypeConstant)
{
return BoolExpression.CreateLiteral(new TypeRestriction(new MemberProjectedSlot(path),
new Domain(domainValue, domainMap.GetDomain(path))), domainMap);
}
else
{
return BoolExpression.CreateLiteral(new ScalarRestriction(new MemberProjectedSlot(path),
new Domain(domainValue, domainMap.GetDomain(path))), domainMap);
}
}
internal static IEqualityComparer<FragmentQuery> GetEqualityComparer(FragmentQueryProcessor qp)
{
return new FragmentQueryEqualityComparer(qp);
}
#endregion
#region Equality Comparer
// Two queries are "equal" if they project the same set of attributes
// and their WHERE clauses are equivalent
private class FragmentQueryEqualityComparer : IEqualityComparer<FragmentQuery>
{
FragmentQueryProcessor _qp;
internal FragmentQueryEqualityComparer(FragmentQueryProcessor qp)
{
_qp = qp;
}
#region IEqualityComparer<FragmentQuery> Members
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2140:TransparentMethodsMustNotReferenceCriticalCode", Justification = "Based on Bug VSTS Pioneer #433188: IsVisibleOutsideAssembly is wrong on generic instantiations.")]
public bool Equals(FragmentQuery x, FragmentQuery y)
{
if (!x.Attributes.SetEquals(y.Attributes))
{
return false;
}
return _qp.IsEquivalentTo(x, y);
}
// Hashing a bit naive: it exploits syntactic properties,
// i.e., some semantically equivalent queries may produce different hash codes
// But that's fine for usage scenarios in QueryRewriter.cs
public int GetHashCode(FragmentQuery q)
{
int attrHashCode = 0;
foreach (MemberPath member in q.Attributes)
{
attrHashCode ^= MemberPath.EqualityComparer.GetHashCode(member);
}
int varHashCode = 0;
int constHashCode = 0;
foreach (MemberRestriction oneOf in q.Condition.MemberRestrictions)
{
varHashCode ^= MemberPath.EqualityComparer.GetHashCode(oneOf.RestrictedMemberSlot.MemberPath);
foreach (Constant constant in oneOf.Domain.Values)
{
constHashCode ^= Constant.EqualityComparer.GetHashCode(constant);
}
}
return attrHashCode * 13 + varHashCode * 7 + constHashCode;
}
#endregion
}
#endregion
}
}
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