/// <summary>
/// A Function which attempts to reduce a Uri to a QName
/// </summary>
/// <param name="uri">The Uri to attempt to reduce</param>
/// <param name="qname">The value to output the QName to if possible</param>
/// <returns></returns>
/// <remarks>This function will return a Boolean indicated whether it succeeded in reducing the Uri to a QName. If it did then the out parameter qname will contain the reduction, otherwise it will be the empty string.</remarks>
public override bool ReduceToQName(string uri, out string qname)
{
// See if we've cached this mapping
QNameMapping mapping;
if (_mapping.TryGetValue(uri, out mapping))
{
qname = mapping.QName;
return(true);
}
mapping = new QNameMapping(uri);
foreach (Uri u in _uris.Values)
{
String baseuri = u.AbsoluteUri;
// Does the Uri start with the Base Uri
if (uri.StartsWith(baseuri))
{
// Remove the Base Uri from the front of the Uri
qname = uri.Substring(baseuri.Length);
// Add the Prefix back onto the front plus the colon to give a QName
if (_prefixes.ContainsKey(u.GetEnhancedHashCode()))
{
qname = _prefixes[u.GetEnhancedHashCode()] + ":" + qname;
if (qname.Equals(":"))
{
continue;
}
if (qname.Contains("/") || qname.Contains("#"))
{
continue;
}
// Cache the Mapping
mapping.QName = qname;
AddToCache(uri, mapping);
return(true);
}
}
}
// Failed to find a Reduction
qname = String.Empty;
return(false);
}
/// <summary>
/// Adds a QName mapping to the cache
/// </summary>
/// <param name="uri">URI</param>
/// <param name="mapping">Mapping</param>
protected virtual void AddToCache(String uri, QNameMapping mapping)
{
this._mapping.Add(uri, mapping);
}
/// <summary>
/// A Function which attempts to reduce a Uri to a QName and issues a Temporary Namespace if required
/// </summary>
/// <param name="uri">The Uri to attempt to reduce</param>
/// <param name="qname">The value to output the QName to if possible</param>
/// <param name="tempNamespace">The Temporary Namespace issued (if any)</param>
/// <returns></returns>
/// <remarks>
/// <para>
/// This function will always returns a possible QName for the URI if the format of the URI permits it. It doesn't guarentee that the QName will be valid for the syntax it is being written to - it is up to implementers of writers to validate the QNames returned.
/// </para>
/// <para>
/// Where necessary a Temporary Namespace will be issued and the <paramref name="tempNamespace">tempNamespace</paramref> parameter will be set to the prefix of the new temporary namespace
/// </para>
/// </remarks>
public bool ReduceToQName(String uri, out String qname, out String tempNamespace)
{
tempNamespace = String.Empty;
//See if we've cached this mapping
QNameMapping mapping;
if (this._mapping.TryGetValue(uri, out mapping))
{
qname = mapping.QName;
return(true);
}
mapping = new QNameMapping(uri);
//Try and find a Namespace URI that is the prefix of the URI
foreach (Uri u in this._uris.Values)
{
String baseuri = u.AbsoluteUri;
//Does the Uri start with the Base Uri
if (uri.StartsWith(baseuri))
{
//Remove the Base Uri from the front of the Uri
qname = uri.Substring(baseuri.Length);
//Add the Prefix back onto the front plus the colon to give a QName
if (this._prefixes.ContainsKey(u.GetEnhancedHashCode()))
{
qname = this._prefixes[u.GetEnhancedHashCode()] + ":" + qname;
if (qname.Equals(":"))
{
continue;
}
if (qname.Contains("/") || qname.Contains("#"))
{
continue;
}
//Cache the Mapping
mapping.QName = qname;
this.AddToCache(uri, mapping);
return(true);
}
}
}
//Try and issue a Temporary Namespace
String nsUri, nsPrefix;
if (uri.Contains('#'))
{
nsUri = uri.Substring(0, uri.LastIndexOf('#') + 1);
nsPrefix = this.GetNextTemporaryNamespacePrefix();
}
else if (uri.LastIndexOf('/') > 8)
{
nsUri = uri.Substring(0, uri.LastIndexOf('/') + 1);
nsPrefix = this.GetNextTemporaryNamespacePrefix();
}
else
{
//Failed to find a Reduction and unable to issue a Temporary Namespace
qname = String.Empty;
return(false);
}
//Add to Namespace Map
this.AddNamespace(nsPrefix, UriFactory.Create(nsUri));
//Cache mapping and return
mapping.QName = nsPrefix + ":" + uri.Replace(nsUri, String.Empty);
this.AddToCache(uri, mapping);
qname = mapping.QName;
tempNamespace = nsPrefix;
return(true);
}
/// <summary>
/// Adds a QName Mapping to the Cache in a Thread Safe way
/// </summary>
/// <param name="key">Key</param>
/// <param name="value">Value</param>
protected override void AddToCache(int key, QNameMapping value)
{
try
{
Monitor.Enter(this._mapping);
base.AddToCache(key, value);
}
finally
{
Monitor.Exit(this._mapping);
}
}
/// <summary>
/// Adds a URI to QName Mapping to the Cache
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
protected virtual void AddToCache(int key, QNameMapping value)
{
this._mapping.Add(key, value);
}
/// <summary>
/// A Function which attempts to reduce a Uri to a QName and issues a Temporary Namespace if required
/// </summary>
/// <param name="uri">The Uri to attempt to reduce</param>
/// <param name="qname">The value to output the QName to if possible</param>
/// <param name="tempNamespace">The Temporary Namespace issued (if any)</param>
/// <returns></returns>
/// <remarks>
/// <para>
/// This function will always returns a possible QName for the URI if the format of the URI permits it. It doesn't guarentee that the QName will be valid for the syntax it is being written to - it is up to implementers of writers to validate the QNames returned.
/// </para>
/// <para>
/// Where necessary a Temporary Namespace will be issued and the <paramref name="tempNamespace">tempNamespace</paramref> parameter will be set to the prefix of the new temporary namespace
/// </para>
/// </remarks>
public bool ReduceToQName(String uri, out String qname, out String tempNamespace)
{
tempNamespace = String.Empty;
//See if we've cached this mapping
QNameMapping mapping = new QNameMapping(uri);
if (this._mapping.Contains(uri.GetHashCode(), mapping))
{
qname = this._mapping[uri.GetHashCode()].QName;
return true;
}
//Try and find a Namespace URI that is the prefix of the URI
foreach (Uri u in this._uris.Values)
{
String baseuri = u.ToString();
//Does the Uri start with the Base Uri
if (uri.StartsWith(baseuri))
{
//Remove the Base Uri from the front of the Uri
qname = uri.Substring(baseuri.Length);
//Add the Prefix back onto the front plus the colon to give a QName
if (this._prefixes.ContainsKey(u.GetEnhancedHashCode()))
{
qname = this._prefixes[u.GetEnhancedHashCode()] + ":" + qname;
if (qname.Equals(":")) continue;
if (qname.Contains("/") || qname.Contains("#")) continue;
//Cache the Mapping
mapping.QName = qname;
this.AddToCache(uri.GetHashCode(), mapping);
return true;
}
}
}
//Try and issue a Temporary Namespace
String nsUri, nsPrefix;
if (uri.Contains('#'))
{
nsUri = uri.Substring(0, uri.LastIndexOf('#') + 1);
nsPrefix = this.GetNextTemporaryNamespacePrefix();
}
else if (uri.LastIndexOf('/') > 8)
{
nsUri = uri.Substring(0, uri.LastIndexOf('/') + 1);
nsPrefix = this.GetNextTemporaryNamespacePrefix();
}
else
{
//Failed to find a Reduction and unable to issue a Temporary Namespace
qname = String.Empty;
return false;
}
//Add to Namespace Map
this.AddNamespace(nsPrefix, UriFactory.Create(nsUri));
//Cache mapping and return
mapping.QName = nsPrefix + ":" + uri.Replace(nsUri, String.Empty);
this.AddToCache(uri.GetHashCode(), mapping);
qname = mapping.QName;
tempNamespace = nsPrefix;
return true;
}
/// <summary>
/// A Function which attempts to reduce a Uri to a QName
/// </summary>
/// <param name="uri">The Uri to attempt to reduce</param>
/// <param name="qname">The value to output the QName to if possible</param>
/// <returns></returns>
/// <remarks>This function will return a Boolean indicated whether it succeeded in reducing the Uri to a QName. If it did then the out parameter qname will contain the reduction, otherwise it will be the empty string.</remarks>
public override bool ReduceToQName(string uri, out string qname)
{
//See if we've cached this mapping
QNameMapping mapping = new QNameMapping(uri);
if (this._mapping.Contains(uri.GetHashCode(), mapping))
{
qname = this._mapping[uri.GetHashCode()].QName;
return true;
}
foreach (Uri u in this._uris.Values)
{
String baseuri = u.ToString();
//Does the Uri start with the Base Uri
if (uri.StartsWith(baseuri))
{
//Remove the Base Uri from the front of the Uri
qname = uri.Substring(baseuri.Length);
//Add the Prefix back onto the front plus the colon to give a QName
if (this._prefixes.ContainsKey(u.GetEnhancedHashCode()))
{
qname = this._prefixes[u.GetEnhancedHashCode()] + ":" + qname;
if (qname.Equals(":")) continue;
if (qname.Contains("/") || qname.Contains("#")) continue;
//Cache the Mapping
mapping.QName = qname;
this.AddToCache(uri.GetHashCode(), mapping);
return true;
}
}
}
//Failed to find a Reduction
qname = String.Empty;
return false;
}
/// <summary>
/// Adds a URI to QName Mapping to the Cache
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
protected virtual void AddToCache(int key, QNameMapping value)
{
this._mapping.Add(key, value);
}
