/// <summary>
/// Adds a literal to the Graph
/// </summary>
/// <param name="literalValue">A string representing the value of the literal.</param>
/// <returns>An object that implements the IOwlLiteral interface. This is a reference to the newly added literal.</returns>
/// <remarks>This method looks in the graph to determine whether a literal with the specified value (and a null datatype and langID) exists
/// in the Graph. If the literal exists a reference to the existing literal is returned. If it does not exist then a new literal (with the specified value, and null datatype and LangID)
/// is created, added to the graph and returned.</remarks>
public IOwlLiteral AddLiteral(string literalValue)
{
OwlLiteral literal = (OwlLiteral)_literals[literalValue];
if (literal == null)
{
literal = new OwlLiteral(literalValue);
_literals[literalValue] = literal;
}
return(literal);
}
/// <summary>
/// Implementation of the visit function to generate some output, used in the visitor pattern
/// </summary>
/// <param name="node">The actual node which needs to be generated</param>
/// <param name="parent">The parent object of the node</param>
public override void Visit(OwlLiteral node, Object parent)
{
XmlElement parentElement = parent as XmlElement;
_messages.Add("Writing " + node.ID);
if (parentElement != null)
{
// Set the datatype property on its parent
XmlAttribute nameAttribute = _owlDocument.CreateAttribute("rdf", "datatype", OwlNamespaceCollection.RdfNamespace);
nameAttribute.Value = node.Datatype;
parentElement.Attributes.Append(nameAttribute);
// Add the value of the literal
parentElement.InnerXml = node.Value;
_visited.Add(node);
return;
}
}
/// <summary>
/// Adds a literal to the Graph
/// </summary>
/// <param name="literalValue">A string representing the value of the literal.</param>
/// <param name="langID">A string representing the Language ID of the literal.</param>
/// <param name="datatypeUri">A string representing the datatype URI of the literal.</param>
/// <returns>An object that implements the IOwlLiteral interface. This is a reference to the newly added literal.</returns>
/// <exception cref="UriFormatException">The specified datatype URI is not null and is not a well formed URI.</exception>
/// <remarks>This method looks in the graph to determine whether a literal with the specified value, datatype and langID exists
/// in the Graph. If the literal exists a reference to the existing literal is returned. If it does not exist then a new literal with the specified value, datatype and LangID
/// is created, added to the graph and returned. Any parameter supplied to this method, except literalValue, can be null or empty and it will be ignored.</remarks>
public IOwlLiteral AddLiteral(string literalValue, string langID, string datatypeUri)
{
string literalID = literalValue;
if ((langID != null) && (langID.Length != 0))
{
literalID += "@" + langID;
}
if ((datatypeUri != null) && (datatypeUri.Length != 0))
{
literalID += "^^" + datatypeUri;
}
OwlLiteral literal = (OwlLiteral)_literals[literalID];
if (literal == null)
{
literal = new OwlLiteral(literalValue, langID, datatypeUri);
_literals[literalID] = literal;
}
return(literal);
}
/// <summary>
/// Adds a literal to the Graph
/// </summary>
/// <param name="literalValue">A string representing the value of the literal.</param>
/// <param name="langID">A string representing the Language ID of the literal.</param>
/// <param name="datatypeUri">A string representing the datatype URI of the literal.</param>
/// <returns>An object that implements the IOwlLiteral interface. This is a reference to the newly added literal.</returns>
/// <exception cref="UriFormatException">The specified datatype URI is not null and is not a well formed URI.</exception>
/// <remarks>This method looks in the graph to determine whether a literal with the specified value, datatype and langID exists
/// in the Graph. If the literal exists a reference to the existing literal is returned. If it does not exist then a new literal with the specified value, datatype and LangID
/// is created, added to the graph and returned. Any parameter supplied to this method, except literalValue, can be null or empty and it will be ignored.</remarks>
public IOwlLiteral AddLiteral(string literalValue, string langID, string datatypeUri)
{
string literalID = literalValue;
if((langID != null) && (langID.Length != 0))
literalID +="@"+langID;
if((datatypeUri != null) && (datatypeUri.Length != 0))
literalID +="^^"+datatypeUri;
OwlLiteral literal = (OwlLiteral)_literals[literalID];
if(literal == null)
{
literal = new OwlLiteral(literalValue,langID,datatypeUri);
_literals[literalID] = literal;
}
return literal;
}
/// <summary>
/// Adds a literal to the Graph
/// </summary>
/// <param name="literalValue">A string representing the value of the literal.</param>
/// <returns>An object that implements the IOwlLiteral interface. This is a reference to the newly added literal.</returns>
/// <remarks>This method looks in the graph to determine whether a literal with the specified value (and a null datatype and langID) exists
/// in the Graph. If the literal exists a reference to the existing literal is returned. If it does not exist then a new literal (with the specified value, and null datatype and LangID)
/// is created, added to the graph and returned.</remarks>
public IOwlLiteral AddLiteral(string literalValue)
{
OwlLiteral literal = (OwlLiteral)_literals[literalValue];
if(literal == null)
{
literal = new OwlLiteral(literalValue);
_literals[literalValue] = literal;
}
return literal;
}
/// <summary>
/// Implementation of the visit function to generate some output, used in the visitor pattern
/// </summary>
/// <param name="node">The actual node which needs to be generated</param>
/// <param name="parent">The parent object of the node</param>
public override void Visit(OwlLiteral node, Object parent)
{
XmlElement parentElement = parent as XmlElement;
_messages.Add("Writing " + node.ID);
if(parentElement != null)
{
// Set the datatype property on its parent
XmlAttribute nameAttribute = _owlDocument.CreateAttribute("rdf", "datatype", OwlNamespaceCollection.RdfNamespace);
nameAttribute.Value = node.Datatype;
parentElement.Attributes.Append(nameAttribute);
// Add the value of the literal
parentElement.InnerXml = node.Value;
node.Visited = true;
return;
}
}
/// <summary> /// Implementation of the visit function to generate some output, used in the visitor pattern /// </summary> /// <param name="node">The actual node which needs to be generated</param> /// <param name="parent">The parent object of the node</param> public abstract void Visit(OwlLiteral node, Object parent);
/// <summary> /// Implementation of the visit function to generate some output, used in the visitor pattern /// </summary> /// <param name="node">The actual node which needs to be generated</param> /// <param name="parent">The parent object of the node</param> public abstract void Visit(OwlLiteral node, Object parent);
