UnionCodeGroup.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Policy / UnionCodeGroup.cs / 1 / UnionCodeGroup.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//  UnionCodeGroup.cs
// 
//  Representation for code groups used for the policy mechanism 
//
 
namespace System.Security.Policy {

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

        public UnionCodeGroup( IMembershipCondition membershipCondition, PolicyStatement policy ) 
            : base( membershipCondition, policy )
        { 
        } 

 
        public override PolicyStatement Resolve( Evidence evidence )
        {
            if (evidence == null)
                throw new ArgumentNullException("evidence"); 

            if (this.MembershipCondition.Check( evidence )) 
            { 
                PolicyStatement thisPolicy = this.PolicyStatement;
 
                IEnumerator enumerator = this.Children.GetEnumerator();

                while (enumerator.MoveNext())
                { 
                    PolicyStatement childPolicy = ((CodeGroup)enumerator.Current).Resolve( evidence );
 
                    if (childPolicy != null) 
                    {
                        if (((thisPolicy.Attributes & childPolicy.Attributes) & PolicyStatementAttribute.Exclusive) == PolicyStatementAttribute.Exclusive) 
                        {
                            throw new PolicyException( Environment.GetResourceString( "Policy_MultipleExclusive" ) );
                        }
 
                        thisPolicy.GetPermissionSetNoCopy().InplaceUnion( childPolicy.GetPermissionSetNoCopy() );
                        thisPolicy.Attributes = thisPolicy.Attributes | childPolicy.Attributes; 
                    } 
                }
 
                return thisPolicy;
            }
            else
            { 
                return null;
            } 
        } 

        ///  
        PolicyStatement IUnionSemanticCodeGroup.InternalResolve( Evidence evidence )
        {
            if (evidence == null)
                throw new ArgumentNullException("evidence"); 

            if (this.MembershipCondition.Check( evidence )) 
            { 
                return this.PolicyStatement;
            } 
            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 );
                    }
                }
 
                return retGroup;
 
            } 
            else
            { 
                return null;
            }
        }
 

        public override CodeGroup Copy() 
        { 
            UnionCodeGroup group = new UnionCodeGroup();
 
            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_Union" );
            } 
        }
 
        internal override String GetTypeName() 
        {
            return "System.Security.Policy.UnionCodeGroup"; 
        }
 	
    }
 
}

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