/// <summary>
/// Initializes a new instance of the <see cref="XacmlAttributeAssignmentExpression"/> class.
/// </summary>
/// <param name="attributeId">The attribute identifier.</param>
/// <param name="expressionElement">The expression element.</param>
public XacmlAttributeAssignmentExpression(Uri attributeId, IXacmlApply expressionElement) {
Contract.Requires<ArgumentNullException>(attributeId != null);
Contract.Requires<ArgumentNullException>(expressionElement != null);
this.attributeId = attributeId;
this.Property = expressionElement;
}
/// <summary>
/// Initializes a new instance of the <see cref="XacmlAttributeAssignmentExpression"/> class.
/// </summary>
/// <param name="attributeId">The attribute identifier.</param>
/// <param name="expressionElement">The expression element.</param>
public XacmlAttributeAssignmentExpression(Uri attributeId, IXacmlApply expressionElement)
{
if (attributeId == null)
{
throw new ArgumentNullException(nameof(attributeId));
}
if (expressionElement == null)
{
throw new ArgumentNullException(nameof(expressionElement));
}
this.attributeId = attributeId;
this.Property = expressionElement;
}
protected virtual object ExpressionEvaluate(IXacmlApply expression) {
Contract.Requires<ArgumentNullException>(expression != null);
object result = null;
Type applyElemType = expression.GetType();
if (applyElemType == typeof(XacmlVariableReference)) {
XacmlVariableReference reference = expression as XacmlVariableReference;
XacmlVariableDefinition definition = this.currentEvaluatingPolicy.VariableDefinitions.Where(o => o.VariableId == reference.VariableReference).SingleOrDefault();
if (definition == null) {
throw Diagnostic.DiagnosticTools.ExceptionUtil.ThrowHelperError(new XacmlInvalidSyntaxException("Missing Variable definition " + reference.VariableReference));
}
// Cache value
if (definition.CalculatedValue != null) {
result = definition.CalculatedValue;
}
else {
result = this.ExpressionEvaluate(definition.Property);
definition.CalculatedValue = result;
}
}
else if (applyElemType == typeof(XacmlAttributeSelector)) {
result = this.GetAttributeSelector(expression as XacmlAttributeSelector);
}
else if (applyElemType == typeof(XacmlResourceAttributeDesignator)) {
XacmlResourceAttributeDesignator design = expression as XacmlResourceAttributeDesignator;
IEnumerable<string> designatorsNames = this.GetResourceAttributeDesignator(design);
if (designatorsNames == null) {
throw new XacmlIndeterminateException("XacmlResourceAttributeDesignator indeterminate");
}
TypeConverterWrapper typeConverter = this.types[design.DataType.ToString()];
result = typeConverter.ConvertEnumerable(designatorsNames.Select(o => typeConverter.ConvertFromString(o, design)));
}
else if (applyElemType == typeof(XacmlActionAttributeDesignator)) {
XacmlActionAttributeDesignator design = expression as XacmlActionAttributeDesignator;
IEnumerable<string> designatorsNames = this.GetActionAttributeDesignator(design);
if (designatorsNames == null) {
throw Diagnostic.DiagnosticTools.ExceptionUtil.ThrowHelperError(new XacmlIndeterminateException("XacmlActionAttributeDesignator indeterminate"));
}
TypeConverterWrapper typeConverter = this.types[design.DataType.ToString()];
result = typeConverter.ConvertEnumerable(designatorsNames.Select(o => typeConverter.ConvertFromString(o, design)));
}
else if (applyElemType == typeof(XacmlEnvironmentAttributeDesignator)) {
XacmlEnvironmentAttributeDesignator design = expression as XacmlEnvironmentAttributeDesignator;
IEnumerable<string> designatorsNames = this.GetEnvironmentAttributeDesignator(design);
if (designatorsNames == null) {
throw new XacmlIndeterminateException("XacmlEnvironmentAttributeDesignator indeterminate");
}
TypeConverterWrapper typeConverter = this.types[design.DataType.ToString()];
result = typeConverter.ConvertEnumerable(designatorsNames.Select(o => typeConverter.ConvertFromString(o, design)));
}
else if (applyElemType == typeof(XacmlSubjectAttributeDesignator)) {
XacmlSubjectAttributeDesignator design = expression as XacmlSubjectAttributeDesignator;
IEnumerable<string> designatorsNames = this.GetSubjectAttributeDesignator(design);
if (designatorsNames == null) {
throw new XacmlIndeterminateException("XacmlSubjectAttributeDesignator indeterminate");
}
TypeConverterWrapper typeConverter = this.types[design.DataType.ToString()];
result = typeConverter.ConvertEnumerable(designatorsNames.Select(o => typeConverter.ConvertFromString(o, design)));
}
else if (applyElemType == typeof(XacmlAttributeValue)) {
XacmlAttributeValue attributeValue = expression as XacmlAttributeValue;
result = this.types[attributeValue.DataType.ToString()].ConvertFromString(attributeValue.Value, attributeValue);
}
else if (applyElemType == typeof(XacmlFunction)) {
XacmlFunction functionDelegate = expression as XacmlFunction;
result = this.functions[functionDelegate.FunctionId.ToString()];
}
else if (applyElemType == typeof(XacmlApply)) {
result = this.ApplyEvaluate(expression as XacmlApply);
}
return result;
}