/// <summary>
/// Attempts to retrieve any stored data from the document cache.
/// </summary>
/// <param name="type"></param>
/// <param name="key"></param>
/// <param name="nav"></param>
/// <returns></returns>
protected virtual bool TryGetCachedData(string type, string key, out XPathDataCacheItem item)
{
object value;
Document doc = this.Document;
if (null == doc)
{
throw new NullReferenceException("This data source is not part of the document heirarchy and cannot use the caching capabilities available");
}
IPDFCacheProvider cacheProv = doc.CacheProvider;
if (null != cacheProv)
{
if (cacheProv.TryRetrieveFromCache(type, key, out value))
{
if (!(value is XPathDataCacheItem))
{
throw new InvalidCastException("The data returned from the cache for this XPath datasource '" + this.ID + "' was not an XPathNavigator.");
}
item = (XPathDataCacheItem)value;
return(true);
}
}
item = null;
return(false);
}
/// <summary>
/// Adds the XPath document to the documents cache provider.
/// </summary>
/// <param name="type"></param>
/// <param name="key"></param>
/// <param name="nav"></param>
protected virtual void AddToCache(string type, string key, XPathDataCacheItem item)
{
Document doc = this.Document;
if (null == doc)
{
throw new NullReferenceException("This data source is not part of the document heirarchy and cannot use the caching capabilities available");
}
IPDFCacheProvider cacheProv = doc.CacheProvider;
if (null != cacheProv)
{
DateTime expires = DateTime.Now.AddMinutes(this.CacheDuration);
cacheProv.AddToCache(type, key, item, expires);
}
}
protected virtual System.Xml.Xsl.XslCompiledTransform DoGetTransformer(int cacheduration, IPDFDataSource source, PDFDataContext context)
{
if (null == _transformer)
{
string path = this.XSLTPath;
if (string.IsNullOrEmpty(path))
{
throw new NullReferenceException(string.Format(Errors.XSLTPathOrTransformerNotSetOnInstance, source.ID));
}
path = source.MapPath(path);
IPDFCacheProvider cache = ((Scryber.Components.Document)source.Document).CacheProvider;
System.Xml.Xsl.XslCompiledTransform transformer;
object found;
if (cacheduration > 0 && cache.TryRetrieveFromCache(XSLTCacheType, path, out found))
{
transformer = (System.Xml.Xsl.XslCompiledTransform)found;
}
else
{
transformer = new System.Xml.Xsl.XslCompiledTransform(XSLTUseDebug);
try
{
transformer.Load(path);
}
catch (Exception ex)
{
throw new PDFDataException(string.Format(Errors.XSLTCouldNotBeLoadedFromPath, path), ex);
}
if (cacheduration > 0)
{
cache.AddToCache(XSLTCacheType, path, transformer, new TimeSpan(0, cacheduration, 0));
}
}
_transformer = transformer;
}
return(_transformer);
}
