/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
XmlDocument doc = context.ContextDocument.XmlDocument;
if( context.ContextDocument.XmlNamespaceManager == null )
{
context.ContextDocument.AddNamespaces( context.PolicyDocument.Namespaces );
}
string xPath = GetStringArgument( args, 0 );
XmlNodeList firstList = doc.DocumentElement.SelectNodes( xPath, context.ContextDocument.XmlNamespaceManager );
xPath = GetStringArgument( args, 1 );
XmlNodeList secondList = doc.DocumentElement.SelectNodes( xPath, context.ContextDocument.XmlNamespaceManager );
foreach( XmlNode firstNode in firstList )
{
foreach( XmlNode secondNode in secondList )
{
if( firstNode == secondNode )
{
return EvaluationValue.True;
}
}
}
return EvaluationValue.False;
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
inf.IDataType type = DataType;
BagValue retBag = new BagValue( type );
inf.IFunction function = type.EqualFunction;
inf.IFunction functionDup = type.IsInFunction;
foreach( object par1 in args[0].Elements )
{
foreach( object par2 in args[1].Elements )
{
EvaluationValue retVal = function.Evaluate(
context,
new EvaluationValue( par1, args[0].GetType( context ) ),
new EvaluationValue( par2, args[1].GetType( context ) ) );
if( retVal.BoolValue )
{
retVal = functionDup.Evaluate( context, new EvaluationValue( par2, args[1].GetType( context ) ), retBag );
if( !retVal.BoolValue )
{
retBag.Add( new EvaluationValue( par1, args[0].GetType( context ) ) );
}
}
}
}
return new EvaluationValue( retBag, type );
}
/// <summary>
/// Method called by the EvaluationEngine to evaluate the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The IFuctionParameters that will be used as arguments to the function.</param>
/// <returns></returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
inf.IFunction function = args[0].GetFunction( 0 );
foreach( object par1 in args[1].Elements )
{
bool hasFound = false;
foreach( object par2 in args[2].Elements )
{
EvaluationValue retVal = function.Evaluate(
context,
new EvaluationValue( par1, args[1].GetType( context ) ),
new EvaluationValue( par2, args[2].GetType( context ) ) );
if( retVal.BoolValue )
{
hasFound = true;
break;
}
}
if( !hasFound )
{
return EvaluationValue.False;
}
}
return EvaluationValue.True;
}
/// <summary>
/// The evaluation implementation in the pseudo-code described in the specification.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="policies">The policies that must be evaluated.</param>
/// <returns>The final decission for the combination of the policy evaluation.</returns>
public Decision Evaluate( EvaluationContext context, IMatchEvaluableCollection policies )
{
foreach( IMatchEvaluable policy in policies )
{
Decision decision = policy.Evaluate( context );
context.TraceContextValues();
if( decision == Decision.Deny )
{
context.ProcessingError = false;
context.IsMissingAttribute = false;
return Decision.Deny;
}
if( decision == Decision.Permit )
{
context.ProcessingError = false;
context.IsMissingAttribute = false;
return Decision.Permit;
}
if( decision == Decision.NotApplicable )
{
continue;
}
if( decision == Decision.Indeterminate )
{
return Decision.Indeterminate;
}
}
return Decision.NotApplicable;
}
/// <summary>
/// Method called by the EvaluationEngine when an attribute is not found.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="designator">The attribute designator.</param>
/// <returns>An instance of an Attribute with it's value.</returns>
public ctx.AttributeElement GetAttribute(rtm.EvaluationContext context, pol.AttributeDesignatorBase designator)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (designator == null)
{
throw new ArgumentNullException("designator");
}
foreach (ctx.AttributeElement attrib in _attributes)
{
if (attrib.AttributeId == designator.AttributeId)
{
if (designator.Issuer != null && designator.Issuer.Length != 0)
{
if (designator.Issuer == attrib.Issuer)
{
return(attrib);
}
}
else
{
return(attrib);
}
}
}
return(null);
}
/// <summary>
/// Method called by the EvaluationEngine to evaluate the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The IFuctionParameters that will be used as arguments to the function.</param>
/// <returns></returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
int argCount = GetIntegerArgument( args, 0 );
if( args.Length - 1 < argCount )
{
return EvaluationValue.Indeterminate;
}
else if( argCount == 0 )
{
return EvaluationValue.True;
}
else
{
int count = 0;
for( int i = 1; i < args.Length; i++ )
{
if( GetBooleanArgument( args, i ) )
{
count++;
}
if( count == argCount )
{
return EvaluationValue.True;
}
}
return EvaluationValue.False;
}
}
/// <summary>
/// Method called by the EvaluationEngine to evaluate the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The IFuctionParameters that will be used as arguments to the function.</param>
/// <returns></returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
inf.IFunction function = args[0].GetFunction( 0 );
if( function.Returns != DataTypeDescriptor.Boolean )
{
return EvaluationValue.Indeterminate;
}
foreach( object par1 in args[1].Elements )
{
foreach( object par2 in args[2].Elements )
{
EvaluationValue retVal = function.Evaluate(
context,
new EvaluationValue( par1, args[1].GetType( context ) ), new EvaluationValue( par2, args[2].GetType( context ) ) );
if( !retVal.BoolValue )
{
return EvaluationValue.False;
}
}
}
return EvaluationValue.True;
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
if( GetBase64BinaryArgument( args, 0 ).Equals( GetBase64BinaryArgument( args, 1 ) ) )
{
return EvaluationValue.True;
}
return EvaluationValue.False;
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
bool retVal = GetBooleanArgument( args, 0 );
for( int i = 1; i < args.Length; i++ )
{
retVal &= GetBooleanArgument( args, i );
}
return new EvaluationValue( retVal, DataTypeDescriptor.Boolean );
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
UriBuilder uri = new UriBuilder( GetAnyUriArgument( args, 0 ) );
for( int i = 1; i < args.Length; i++ )
{
uri.Path = Path.Combine( uri.Path, GetStringArgument( args, i ) );
}
return new EvaluationValue( uri.Uri, DataTypeDescriptor.AnyUri );
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
double add = 0;
for( int i = 0; i < args.Length; i++ )
{
add += GetDoubleArgument( args, i );
}
return new EvaluationValue( add, DataTypeDescriptor.Double );
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
StringBuilder concat = new StringBuilder();
for( int i = 0; i < args.Length; i++ )
{
concat.Append( GetStringArgument( args, i ) );
}
return new EvaluationValue( concat.ToString(), DataTypeDescriptor.String );
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
inf.IDataType type = DataType;
BagValue bag = new BagValue( type );
for( int i = 0; i < args.Length; i++ )
{
bag.Add( args[ i ].GetTypedValue( type, i ) );
}
return new EvaluationValue( bag, type );
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
DateTime baseDate = GetDateArgument( args, 0 );
typ.YearMonthDuration yearMonthDuration = (typ.YearMonthDuration)args[1].GetTypedValue( DataTypeDescriptor.YearMonthDuration, 1 );
baseDate = baseDate.AddYears( yearMonthDuration.Years*-1 );
baseDate = baseDate.AddMonths( yearMonthDuration.Months*-1 );
return new EvaluationValue( baseDate, DataTypeDescriptor.Date );
}
/// <summary>
/// The evaluation implementation in the pseudo-code described in the specification.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="policies">The policies that must be evaluated.</param>
/// <returns>The final decission for the combination of the policy evaluation.</returns>
public Decision Evaluate( EvaluationContext context, IMatchEvaluableCollection policies )
{
Boolean atLeastOne = false;
Policy selectedPolicy = null;
TargetEvaluationValue appResult;
for( int i = 0; i < policies.Count; i++ )
{
Policy tempPolicy = (Policy)policies[ i ];
appResult = appResult = tempPolicy.Match( context );
if( appResult == TargetEvaluationValue.Indeterminate )
{
context.ProcessingError = true;
context.TraceContextValues();
return Decision.Indeterminate;
}
if( appResult == TargetEvaluationValue.Match )
{
if ( atLeastOne )
{
context.ProcessingError = true;
context.TraceContextValues();
return Decision.Indeterminate;
}
else
{
atLeastOne = true;
selectedPolicy = (Policy)policies[i];
}
}
if ( appResult == TargetEvaluationValue.NoMatch )
{
continue;
}
}
if ( atLeastOne )
{
Decision retValue = selectedPolicy.Evaluate( context );
context.TraceContextValues();
if( retValue == Decision.Deny || retValue == Decision.Permit )
{
context.ProcessingError = false;
context.IsMissingAttribute = false;
}
return retValue;
}
else
{
return Decision.NotApplicable;
}
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
if( ((typ.Rfc822Name)args[1].GetTypedValue( DataTypeDescriptor.Rfc822Name, 1 )).Matches( GetStringArgument( args, 0 ) ) )
{
return EvaluationValue.True;
}
else
{
return EvaluationValue.False;
}
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
if(String.Compare( GetStringArgument( args, 0 ), GetStringArgument( args, 1 ) ) < 0 )
{
return EvaluationValue.True;
}
else
{
return EvaluationValue.False;
}
}
/// <summary>
/// Method called by the EvaluationEngine when the evaluation is executed without a policy document, this
/// method search in the policy repository and return the first policy that matches its target with the
/// context document specified.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <returns>The policy document ready to be used by the evaluation engine.</returns>
public pol.PolicyDocument Match(rtm.EvaluationContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
pol.PolicyDocument polEv = null;
//Search if there is a policySet which target matches the context document
foreach (pol.PolicyDocument policy in _policySets.Values)
{
rtm.PolicySet tempPolicy = new rtm.PolicySet(context.Engine, (pol.PolicySetElement)policy.PolicySet);
rtm.EvaluationContext tempContext = new rtm.EvaluationContext(context.Engine, policy, context.ContextDocument);
// Match the policy set target with the context document
if (tempPolicy.Match(tempContext) == rtm.TargetEvaluationValue.Match)
{
if (polEv == null)
{
polEv = policy;
}
else
{
throw new EvaluationException(Resource.ResourceManager[Resource.MessageKey.exc_duplicated_policy_in_repository]);
}
}
}
//Search if there is a policy which target matches the context document
foreach (pol.PolicyDocument policy in _policies.Values)
{
rtm.Policy tempPolicy = new rtm.Policy((pol.PolicyElement)policy.Policy);
rtm.EvaluationContext tempContext = new rtm.EvaluationContext(context.Engine, policy, context.ContextDocument);
// Match the policy target with the context document
if (tempPolicy.Match(tempContext) == rtm.TargetEvaluationValue.Match)
{
if (polEv == null)
{
polEv = policy;
}
else
{
throw new EvaluationException(Resource.ResourceManager[Resource.MessageKey.exc_duplicated_policy_in_repository]);
}
}
}
return(polEv);
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
if( args[0].IsBag && args[0].BagSize == 1 )
{
inf.IFunctionParameter attrib = (inf.IFunctionParameter)args[0].Elements[0];
return new EvaluationValue( GetTypedValue( attrib ), DataType );
}
else
{
return EvaluationValue.Indeterminate;
}
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
DateTime baseDate = GetDateTimeArgument( args, 0 );
typ.DaytimeDuration dayTimeDuration = GetDaytimeDurationArgument( args, 1 );
baseDate = baseDate.AddDays( dayTimeDuration.Days );
baseDate = baseDate.AddHours( dayTimeDuration.Hours );
baseDate = baseDate.AddMinutes( dayTimeDuration.Minutes );
baseDate = baseDate.AddSeconds( dayTimeDuration.Seconds );
return new EvaluationValue( baseDate, DataTypeDescriptor.DateTime );
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
XmlDocument doc = context.ContextDocument.XmlDocument;
if( context.ContextDocument.XmlNamespaceManager == null )
{
context.ContextDocument.AddNamespaces( context.PolicyDocument.Namespaces );
}
string xPath = GetStringArgument( args, 0 );
XmlNodeList list = doc.DocumentElement.SelectNodes( xPath, context.ContextDocument.XmlNamespaceManager );
return new EvaluationValue( list.Count, DataTypeDescriptor.Integer );
}
/// <summary>
/// Method called by the EvaluationEngine to evaluate the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The IFuctionParameters that will be used as arguments to the function.</param>
/// <returns></returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
inf.IFunction function = args[0].GetFunction( 0 );
EvaluationValue value = new EvaluationValue( args[1], args[1].GetType( context ) );
foreach( object par in args[2].Elements )
{
EvaluationValue retVal = function.Evaluate( context, value, new EvaluationValue( par, args[2].GetType( context ) ) );
if( !retVal.BoolValue )
{
return retVal;
}
}
return EvaluationValue.True;
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
string pattern = GetStringArgument( args, 0 );
string input = GetArgumentAsString( args, 1 );
Regex regEx = new Regex( pattern );
Match m = regEx.Match( input );
if( m.Success )
{
return EvaluationValue.True;
}
else
{
return EvaluationValue.False;
}
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
inf.IFunction function = DataType.SubsetFunction;
if( ( function.Evaluate(
context,
new EvaluationValue( args[0], args[0].GetType( context ) ), new EvaluationValue( args[1], args[1].GetType( context ) ) ) == EvaluationValue.True ) &&
( function.Evaluate(
context,
new EvaluationValue( args[1], args[1].GetType( context ) ), new EvaluationValue( args[0], args[0].GetType( context ) ) ) == EvaluationValue.True ) )
{
return EvaluationValue.True;
}
else
{
return EvaluationValue.False;
}
}
/// <summary>
/// Method called by the EvaluationEngine to evaluate the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The IFuctionParameters that will be used as arguments to the function.</param>
/// <returns></returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
inf.IFunction function = args[0].GetFunction( 0 );
if( !args[ 1 ].IsBag )
{
return EvaluationValue.False;
}
BagValue retVal = new BagValue( args[1].GetType( context ) );
foreach( object par in args[1].Elements )
{
retVal.Add(
function.Evaluate(
context,
new EvaluationValue( par, args[1].GetType( context ) ) ) );
}
return new EvaluationValue( retVal, args[1].GetType( context ) );
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
if( args[1].IsBag )
{
inf.IFunction function = DataType.EqualFunction;
foreach( object value in args[1].Elements )
{
if( function.Evaluate(
context,
new EvaluationValue( args[0], args[0].GetType( context ) ),
new EvaluationValue( value, args[1].GetType( context ) ) ) == EvaluationValue.True )
{
return EvaluationValue.True;
}
}
}
return EvaluationValue.False;
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
try
{
if( GetAnyUriArgument( args, 0 ).Equals( GetAnyUriArgument( args, 1 ) ) )
{
return EvaluationValue.True;
}
else
{
return EvaluationValue.False;
}
}
catch( EvaluationException e )
{
context.Trace( Resource.TRACE_ERROR, e.Message );
return EvaluationValue.False;
}
}
/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="args">The function arguments.</param>
/// <returns>The result value of the function evaluation.</returns>
public override EvaluationValue Evaluate( EvaluationContext context, params inf.IFunctionParameter[] args )
{
if (context == null) throw new ArgumentNullException("context");
if (args == null) throw new ArgumentNullException("args");
inf.IFunction function = DataType.EqualFunction;
foreach( object par1 in args[0].Elements )
{
foreach( object par2 in args[1].Elements )
{
EvaluationValue retVal = function.Evaluate(
context,
new EvaluationValue( par1, args[0].GetType( context ) ),
new EvaluationValue( par2, args[1].GetType( context ) ) );
if( retVal.BoolValue )
{
return EvaluationValue.True;
}
}
}
return EvaluationValue.False;
}
/// <summary>
/// The evaluation implementation in the pseudo-code described in the specification.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="rules">The policies that must be evaluated.</param>
/// <returns>The final decission for the combination of the rule evaluation.</returns>
public Decision Evaluate( EvaluationContext context, RuleCollection rules )
{
Decision decision = Decision.Indeterminate;
context.Trace( "Evaluating rules..." );
context.AddIndent();
try
{
foreach( Rule rule in rules )
{
decision = rule.Evaluate( context );
context.TraceContextValues();
if( decision == Decision.Deny )
{
decision = Decision.Deny;
return decision;
}
if( decision == Decision.Permit )
{
decision = Decision.Permit;
return decision;
}
if( decision == Decision.NotApplicable )
{
continue;
}
if( decision == Decision.Indeterminate )
{
decision = Decision.Indeterminate;
return decision;
}
}
return Decision.NotApplicable;
}
finally
{
context.Trace( "Rule combination algorithm: {0}", decision.ToString() );
context.RemoveIndent();
}
}
/// <summary>
/// The evaluation implementation in the pseudo-code described in the specification.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <param name="policies">The policies that must be evaluated.</param>
/// <returns>The final decission for the combination of the policy evaluation.</returns>
public Decision Evaluate( EvaluationContext context, IMatchEvaluableCollection policies )
{
if (context == null) throw new ArgumentNullException("context");
if (policies == null) throw new ArgumentNullException("policies");
bool atLeastOnePermit = false;
foreach( IMatchEvaluable policy in policies )
{
Decision decision = policy.Evaluate( context );
if( decision == Decision.Deny )
{
context.ProcessingError = false;
context.IsMissingAttribute = false;
return Decision.Deny;
}
if( decision == Decision.Permit )
{
atLeastOnePermit = true;
continue;
}
if( decision == Decision.NotApplicable )
{
continue;
}
if( decision == Decision.Indeterminate )
{
context.ProcessingError = false;
context.IsMissingAttribute = false;
return Decision.Deny;
}
}
if( atLeastOnePermit )
{
context.ProcessingError = false;
context.IsMissingAttribute = false;
return Decision.Permit;
}
return Decision.NotApplicable;
}
/// <summary>
/// Evaluates the rule contents.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <returns>A decission for this evalauation.</returns>
public Decision Evaluate( EvaluationContext context )
{
if (context == null) throw new ArgumentNullException("context");
context.Trace( "Evaluating rule: {0}", _rule.Description );
context.AddIndent();
context.CurrentRule = this;
try
{
// Validate the Target element
TargetEvaluationValue targetEvaluation = Match( context );
// If the target matches the conditions ar evaluated
EvaluationValue conditionEvaluation = EvaluationValue.True;
if( _rule.HasCondition )
{
// Evaluate the condition
conditionEvaluation = _condition.Evaluate( context );
}
else
{
context.Trace( "Rule does not have a condition" );
}
// Decite the final rule evaluation value
if( targetEvaluation == TargetEvaluationValue.Indeterminate || conditionEvaluation.IsIndeterminate )
{
_evaluationValue = Decision.Indeterminate;
}
else if( targetEvaluation == TargetEvaluationValue.Match && conditionEvaluation.BoolValue )
{
_evaluationValue = ((_rule.Effect == pol.Effect.Permit) ? Decision.Permit : Decision.Deny);
}
else if( ( targetEvaluation == TargetEvaluationValue.NoMatch ) ||
( targetEvaluation == TargetEvaluationValue.Match && !conditionEvaluation.BoolValue ) )
{
_evaluationValue = Decision.NotApplicable;
}
// Return the value
context.Trace( "Rule: {0}", _evaluationValue );
return _evaluationValue;
}
finally
{
context.RemoveIndent();
context.CurrentRule = null;
}
}
/// <summary>
/// Verifies if the rule target matches
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <returns>The result of the Match process.</returns>
public TargetEvaluationValue Match( EvaluationContext context )
{
if (context == null) throw new ArgumentNullException("context");
TargetEvaluationValue targetEvaluationValue = TargetEvaluationValue.Indeterminate;
context.Trace( "Evaluating rule target" );
context.AddIndent();
try
{
// Evaluate the policy target
targetEvaluationValue = TargetEvaluationValue.Match;
if( _target != null )
{
targetEvaluationValue = _target.Evaluate( context );
context.TraceContextValues();
}
return targetEvaluationValue;
}
finally
{
context.RemoveIndent();
context.Trace( "Target: {0}", targetEvaluationValue );
}
}
/// <summary>
/// Gets the data type of the value.
/// </summary>
/// <param name="context">The evaluation context.</param>
/// <returns>The data type descriptor.</returns>
public inf.IDataType GetType(rtm.EvaluationContext context)
{
return(rtm.EvaluationEngine.GetDataType(DataTypeValue));
}
