/// <summary> initializes the document. init() is not longer
/// dependant upon context, but we need to let the
/// init() carry the template name down throught for VM
/// namespace features
/// </summary>
public virtual void InitDocument()
{
/*
* send an empty InternalContextAdapter down into the AST to initialize it
*/
InternalContextAdapterImpl ica = new InternalContextAdapterImpl(new VelocityContext());
try {
/*
* put the current template name on the stack
*/
ica.PushCurrentTemplateName(name);
/*
* init the AST
*/
((SimpleNode) data).init(ica, rsvc);
} finally {
/*
* in case something blows up...
* pull it off for completeness
*/
ica.PopCurrentTemplateName();
}
}
/// <summary> initializes the document. init() is not longer
/// dependant upon context, but we need to let the
/// init() carry the template name down throught for VM
/// namespace features
/// </summary>
public virtual void InitDocument()
{
/*
* send an empty InternalContextAdapter down into the AST to initialize it
*/
InternalContextAdapterImpl ica = new InternalContextAdapterImpl(new VelocityContext());
try {
/*
* put the current template name on the stack
*/
ica.PushCurrentTemplateName(name);
/*
* init the AST
*/
((SimpleNode)data).init(ica, rsvc);
} finally {
/*
* in case something blows up...
* pull it off for completeness
*/
ica.PopCurrentTemplateName();
}
}
/// <summary> The AST node structure is merged with the
/// context to produce the final output.
/// *
/// Throws IOException if failure is due to a file related
/// issue, and Exception otherwise
/// *
/// </summary>
/// <param name="context">Conext with data elements accessed by template
/// </param>
/// <param name="writer">output writer for rendered template
/// @throws ResourceNotFoundException if template not found
/// from any available source.
/// @throws ParseErrorException if template cannot be parsed due
/// to syntax (or other) error.
/// @throws Exception anything else.
///
/// </param>
public virtual void Merge(IContext context, System.IO.TextWriter writer)
{
/*
* we shouldn't have to do this, as if there is an error condition,
* the application code should never get a reference to the
* Template
*/
if (errorCondition != null)
{
throw errorCondition;
}
if (data != null)
{
/*
* create an InternalContextAdapter to carry the user Context down
* into the rendering engine. Set the template name and render()
*/
InternalContextAdapterImpl ica = new InternalContextAdapterImpl(context);
try {
ica.PushCurrentTemplateName(name);
ica.CurrentResource = this;
((SimpleNode)data).render(ica, writer);
} finally {
/*
* lets make sure that we always clean up the context
*/
ica.PopCurrentTemplateName();
ica.CurrentResource = null;
}
}
else
{
/*
* this shouldn't happen either, but just in case.
*/
System.String msg = "Template.merge() failure. The document is null, " + "most likely due to parsing error.";
rsvc.error(msg);
throw new System.Exception(msg);
}
}
/// <summary>
/// Renders the input reader using the context into the output writer.
/// To be used when a template is dynamically constructed, or want to
/// use Velocity as a token replacer.
/// </summary>
/// <param name="context">context to use in rendering input string</param>
/// <param name="out"> Writer in which to render the output</param>
/// <param name="logTag"> string to be used as the template name for log messages in case of error</param>
/// <param name="reader">Reader containing the VTL to be rendered</param>
/// <returns>true if successful, false otherwise. If false, see Velocity runtime log</returns>
public static bool Evaluate(IContext context, TextWriter writer, System.String logTag, TextReader reader)
{
SimpleNode nodeTree = null;
try {
nodeTree = RuntimeSingleton.parse(reader, logTag);
} catch (ParseException pex) {
throw new ParseErrorException(pex.Message);
}
/*
* now we want to init and render
*/
if (nodeTree != null)
{
InternalContextAdapterImpl ica = new InternalContextAdapterImpl(context);
ica.PushCurrentTemplateName(logTag);
try {
try {
nodeTree.init(ica, RuntimeSingleton.RuntimeServices);
} catch (System.Exception e) {
RuntimeSingleton.error("Velocity.evaluate() : init exception for tag = " + logTag + " : " + e);
}
/*
* now render, and let any exceptions fly
*/
nodeTree.render(ica, writer);
} finally {
ica.PopCurrentTemplateName();
}
return(true);
}
return(false);
}
internal virtual bool Render(DvslNode node, IContext context, TextWriter writer) {
/*
* find if we have an AST where the xpath expression mathes
* for this node
*/
XmlNode dom4jnode = (XmlNode) node.NodeImpl;
XPathNavigator nav = dom4jnode.CreateNavigator();
SimpleNode sn = null;
for (int i = 0; i < xpathList.Count; i++) {
Hashtable m = (Hashtable) xpathList[i];
XPathExpression expr = nav.Compile((String)m["xpath"]);
if (nav.Matches((String)m["xpath"])) {
sn = (SimpleNode) m["ast"];
break;
}
}
// if we found something, render
if (sn != null) {
InternalContextAdapterImpl ica = new InternalContextAdapterImpl(context);
ica.PushCurrentTemplateName(node.Name);
try {
sn.render(ica, writer);
} finally {
ica.PopCurrentTemplateName();
}
return true;
}
return false;
}
/// <summary>
/// Renders the input reader using the context into the output writer.
/// To be used when a template is dynamically constructed, or want to
/// use Velocity as a token replacer.
/// </summary>
/// <param name="context">context to use in rendering input string</param>
/// <param name="out"> Writer in which to render the output</param>
/// <param name="logTag"> string to be used as the template name for log messages in case of error</param>
/// <param name="reader">Reader containing the VTL to be rendered</param>
/// <returns>true if successful, false otherwise. If false, see Velocity runtime log</returns>
public static bool Evaluate(IContext context, TextWriter writer, System.String logTag, TextReader reader) {
SimpleNode nodeTree = null;
try {
nodeTree = RuntimeSingleton.parse(reader, logTag);
} catch (ParseException pex) {
throw new ParseErrorException(pex.Message);
}
/*
* now we want to init and render
*/
if (nodeTree != null) {
InternalContextAdapterImpl ica = new InternalContextAdapterImpl(context);
ica.PushCurrentTemplateName(logTag);
try {
try {
nodeTree.init(ica, RuntimeSingleton.RuntimeServices);
} catch (System.Exception e) {
RuntimeSingleton.error("Velocity.evaluate() : init exception for tag = " + logTag + " : " + e);
}
/*
* now render, and let any exceptions fly
*/
nodeTree.render(ica, writer);
} finally {
ica.PopCurrentTemplateName();
}
return true;
}
return false;
}
/// <summary> The AST node structure is merged with the
/// context to produce the final output.
/// *
/// Throws IOException if failure is due to a file related
/// issue, and Exception otherwise
/// *
/// </summary>
/// <param name="context">Conext with data elements accessed by template
/// </param>
/// <param name="writer">output writer for rendered template
/// @throws ResourceNotFoundException if template not found
/// from any available source.
/// @throws ParseErrorException if template cannot be parsed due
/// to syntax (or other) error.
/// @throws Exception anything else.
///
/// </param>
public virtual void Merge(IContext context, System.IO.TextWriter writer)
{
/*
* we shouldn't have to do this, as if there is an error condition,
* the application code should never get a reference to the
* Template
*/
if (errorCondition != null) {
throw errorCondition;
}
if (data != null) {
/*
* create an InternalContextAdapter to carry the user Context down
* into the rendering engine. Set the template name and render()
*/
InternalContextAdapterImpl ica = new InternalContextAdapterImpl(context);
try {
ica.PushCurrentTemplateName(name);
ica.CurrentResource = this;
((SimpleNode) data).render(ica, writer);
} finally {
/*
* lets make sure that we always clean up the context
*/
ica.PopCurrentTemplateName();
ica.CurrentResource = null;
}
} else {
/*
* this shouldn't happen either, but just in case.
*/
System.String msg = "Template.merge() failure. The document is null, " + "most likely due to parsing error.";
rsvc.error(msg);
throw new System.Exception(msg);
}
}
