Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Policy / FirstMatchCodeGroup.cs / 1 / 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.Util; using System.Security; 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"); if (this.MembershipCondition.Check( evidence )) { PolicyStatement childPolicy = null; IEnumerator enumerator = this.Children.GetEnumerator(); while (enumerator.MoveNext()) { childPolicy = ((CodeGroup)enumerator.Current).Resolve( evidence ); // If the child has a policy, we are done. if (childPolicy != null) break; } PolicyStatement thisPolicy = this.PolicyStatement; if (thisPolicy == null) { return childPolicy; } else if (childPolicy != null) { // Combine the child and this policy and return it. PolicyStatement combined = new PolicyStatement(); combined.SetPermissionSetNoCopy( thisPolicy.GetPermissionSetNoCopy().Union( childPolicy.GetPermissionSetNoCopy() ) ); // if both this group and matching child group are exclusive we need to throw an exception if (((thisPolicy.Attributes & childPolicy.Attributes) & PolicyStatementAttribute.Exclusive) == PolicyStatementAttribute.Exclusive) throw new PolicyException( Environment.GetResourceString( "Policy_MultipleExclusive" ) ); combined.Attributes = thisPolicy.Attributes | childPolicy.Attributes; return combined; } else { // Otherwise we just copy the this policy. 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 ); 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"; } } }
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