FirstMatchCodeGroup.cs source code in C# .NET

                        Code:
                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / clr / src / BCL / System / Security / Policy / FirstMatchCodeGroup.cs / 2 / FirstMatchCodeGroup.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//  FirstMatchCodeGroup.cs
// 
//  Representation for code groups used for the policy mechanism 
//
 
namespace System.Security.Policy {

    using System;
    using System.Security; 
    using System.Security.Util;
    using System.Collections; 
 
    [Serializable]
[System.Runtime.InteropServices.ComVisible(true)] 
    sealed public class FirstMatchCodeGroup : CodeGroup
    {
        internal FirstMatchCodeGroup()
            : base() 
        {
        } 
 
        public FirstMatchCodeGroup( IMembershipCondition membershipCondition, PolicyStatement policy )
            : base( membershipCondition, policy ) 
        {
        }

 
        public override PolicyStatement Resolve( Evidence evidence )
        { 
            if (evidence == null) 
                throw new ArgumentNullException("evidence");
 
            object usedEvidence = null;
            if (PolicyManager.CheckMembershipCondition(MembershipCondition,
                                                       evidence,
                                                       out usedEvidence)) 
            {
                PolicyStatement childPolicy = null; 
 
                IEnumerator enumerator = this.Children.GetEnumerator();
 
                while (enumerator.MoveNext())
                {
                    childPolicy = PolicyManager.ResolveCodeGroup(enumerator.Current as CodeGroup,
                                                                 evidence); 

                    // If the child has a policy, we are done. 
                    if (childPolicy != null) 
                    {
                        break; 
                    }
                }

                // If any delay-evidence was used to generate this grant set, then we need to keep track of 
                // that for potentially later forcing it to be verified.
                IDelayEvaluatedEvidence delayEvidence = usedEvidence as IDelayEvaluatedEvidence; 
                bool delayEvidenceNeedsVerification = delayEvidence != null && !delayEvidence.IsVerified; 

                PolicyStatement thisPolicy = this.PolicyStatement; // PolicyStatement getter makes a copy for us 

                if (thisPolicy == null)
                {
                    // We didn't add any permissions, but we enabled our children to be evaluated, and 
                    // therefore its grant set is dependent on any of our delay evidence.
                    if (delayEvidenceNeedsVerification) 
                    { 
                        childPolicy = childPolicy.Copy();
                        childPolicy.AddDependentEvidence(delayEvidence); 
                    }

                    return childPolicy;
                } 
                else if (childPolicy != null)
                { 
                    // Combine the child and this policy and return it. 

                    PolicyStatement combined = thisPolicy.Copy(); 

                    if (delayEvidenceNeedsVerification)
                    {
                        combined.AddDependentEvidence(delayEvidence); 
                    }
 
                    combined.InplaceUnion(childPolicy); 
                    return combined;
                } 
                else
                {
                    // Otherwise we just copy the this policy.
                    if (delayEvidenceNeedsVerification) 
                    {
                        thisPolicy.AddDependentEvidence(delayEvidence); 
                    } 

                    return thisPolicy; 
                }
            }
            else
            { 
                return null;
            } 
        } 

        public override CodeGroup ResolveMatchingCodeGroups( Evidence evidence ) 
        {
            if (evidence == null)
                throw new ArgumentNullException("evidence");
 
            if (this.MembershipCondition.Check( evidence ))
            { 
                CodeGroup retGroup = this.Copy(); 

                retGroup.Children = new ArrayList(); 

                IEnumerator enumerator = this.Children.GetEnumerator();

                while (enumerator.MoveNext()) 
                {
                    CodeGroup matchingGroups = ((CodeGroup)enumerator.Current).ResolveMatchingCodeGroups( evidence ); 
 
                    // If the child has a policy, we are done.
 
                    if (matchingGroups != null)
                    {
                        retGroup.AddChild( matchingGroups );
                        break; 
                    }
                } 
 
                return retGroup;
 
            }
            else
            {
                return null; 
            }
        } 
 
        public override CodeGroup Copy()
        { 
            FirstMatchCodeGroup group = new FirstMatchCodeGroup();

            group.MembershipCondition = this.MembershipCondition;
            group.PolicyStatement = this.PolicyStatement; 
            group.Name = this.Name;
            group.Description = this.Description; 
 
            IEnumerator enumerator = this.Children.GetEnumerator();
 
            while (enumerator.MoveNext())
            {
                group.AddChild( (CodeGroup)enumerator.Current );
            } 

            return group; 
        } 

 
        public override String MergeLogic
        {
            get
            { 
                return Environment.GetResourceString( "MergeLogic_FirstMatch" );
            } 
        } 
 
        internal override String GetTypeName() 
        {
            return "System.Security.Policy.FirstMatchCodeGroup";
        }
 
    }
 
 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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FirstMatchCodeGroup.cs source code in C# .NET

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