/// <inheritdoc />
/// <exception cref="ArgumentException">Thrown when <paramref name="template" /> is null, empty string or whitespace</exception>
/// <exception cref="InvalidTemplateException"></exception>
/// <exception cref="InvalidOperationException"></exception>
public virtual object GetValue(string template, HierarchicalDataItem dataItem = null)
{
if (string.IsNullOrWhiteSpace(template))
{
throw new ArgumentException(ArgumentHelper.EmptyStringParamMessage, nameof(template));
}
string unwrappedTemplate = this.UnwrapTemplate(template.Trim()).Trim();
int separatorIndex = unwrappedTemplate.IndexOf(MemberLabelSeparator, StringComparison.CurrentCultureIgnoreCase);
if (separatorIndex == -1)
{
throw new InvalidTemplateException($"Invalid template \"{template}\". Cannot find separator \"{MemberLabelSeparator}\" between member label and member template");
}
string memberLabel = unwrappedTemplate.Substring(0, separatorIndex).ToLower().Trim();
string memberTemplate = unwrappedTemplate.Substring(separatorIndex + MemberLabelSeparator.Length).Trim();
if (memberLabel == PropertyMemberLabel)
{
return(PropertyValueProvider.GetValue(memberTemplate));
}
if (memberLabel == DataItemMemberLabel)
{
if (dataItem == null)
{
throw new InvalidOperationException($"Template \"{template}\" contains data reference but dataItem is null");
}
if (DataItemValueProvider == null)
{
throw new InvalidOperationException($"Template \"{template}\" contains data reference but dataItemValueProvider is null");
}
return(DataItemValueProvider.GetValue(memberTemplate, dataItem));
}
if (memberLabel == MethodCallMemberLabel)
{
if (MethodCallValueProvider == null)
{
throw new InvalidOperationException($"Template \"{template}\" contains method call but methodCallValueProvider is null");
}
return(MethodCallValueProvider.CallMethod(memberTemplate, this, dataItem));
}
if (memberLabel == SystemVariableMemberLabel)
{
return(SystemVariableProvider.GetVariable(memberTemplate));
}
if (memberLabel == SystemFunctionMemberLabel)
{
if (SystemFunctionsType == null)
{
throw new InvalidOperationException($"Template \"{template}\" contains system function call but property SystemFunctionsType is null");
}
if (MethodCallValueProvider == null)
{
throw new InvalidOperationException($"Template \"{template}\" contains system function call but methodCallValueProvider is null");
}
return(MethodCallValueProvider.CallMethod(memberTemplate, SystemFunctionsType, this, dataItem));
}
throw new InvalidTemplateException($"Invalid template \"{template}\". Unknown member label \"{memberLabel}\"");
}
public CustomTemplateProcessor(IPropertyValueProvider propertyValueProvider, SystemVariableProvider systemVariableProvider, IMethodCallValueProvider methodCallValueProvider = null, IGenericDataItemValueProvider <HierarchicalDataItem> dataItemValueProvider = null) : base(propertyValueProvider, systemVariableProvider, methodCallValueProvider, dataItemValueProvider)
{
}
/// <param name="propertyValueProvider">See <see cref="IPropertyValueProvider" /></param>
/// <param name="systemVariableProvider">See <see cref="Providers.VariableProviders.SystemVariableProvider" /></param>
/// <param name="methodCallValueProvider">See <see cref="IMethodCallValueProvider" /></param>
/// <param name="dataItemValueProvider">See <see cref="IGenericDataItemValueProvider{T}" /></param>
public DefaultTemplateProcessor(IPropertyValueProvider propertyValueProvider, SystemVariableProvider systemVariableProvider,
IMethodCallValueProvider methodCallValueProvider = null, IGenericDataItemValueProvider <HierarchicalDataItem> dataItemValueProvider = null)
{
PropertyValueProvider = propertyValueProvider ?? throw new ArgumentNullException(nameof(propertyValueProvider), ArgumentHelper.NullParamMessage);
SystemVariableProvider = systemVariableProvider ?? throw new ArgumentNullException(nameof(systemVariableProvider), ArgumentHelper.NullParamMessage);
MethodCallValueProvider = methodCallValueProvider;
DataItemValueProvider = dataItemValueProvider;
}
