org.apache.velocity
Class Template

java.lang.Object
  org.apache.velocity.runtime.resource.Resource
      org.apache.velocity.Template

public class Template
extends Resource

This class is used for controlling all template operations. This class uses a parser created by JavaCC to create an AST that is subsequently traversed by a Visitor.

 // set up and initialize Velocity before this code block

 Template template = Velocity.getTemplate("test.wm");
 Context context = new VelocityContext();

 context.put("foo", "bar");
 context.put("customer", new Customer());

 template.merge(context, writer);
 

Version:

$Id: Template.java 490011 2006-12-24 12:19:09Z henning $

Author:

Jason van Zyl, Geir Magnusson Jr.

Field Summary

Fields inherited from class org.apache.velocity.runtime.resource.Resource

data, encoding, lastModified, MILLIS_PER_SECOND, modificationCheckInterval, name, nextCheck, resourceLoader, rsvc

Constructor Summary

Template()
Default constructor

Method Summary

void	initDocument() initializes the document.
void	merge(Context context, Writer writer) The AST node structure is merged with the context to produce the final output.
boolean	process() gets the named resource as a stream, parses and inits

Methods inherited from class org.apache.velocity.runtime.resource.Resource

getData, getEncoding, getLastModified, getName, getResourceLoader, isSourceModified, requiresChecking, setData, setEncoding, setLastModified, setModificationCheckInterval, setName, setResourceLoader, setRuntimeServices, touch

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Template

public Template()

Default constructor

Method Detail

process

public boolean process()
                throws ResourceNotFoundException,
                       ParseErrorException,
                       IOException

gets the named resource as a stream, parses and inits

Specified by:

process in class Resource

Returns:

true if successful

Throws:

ResourceNotFoundException - if template not found from any available source.

ParseErrorException - if template cannot be parsed due to syntax (or other) error.

IOException - problem reading input stream

initDocument

public void initDocument()
                  throws TemplateInitException

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

Throws:

TemplateInitException - When a problem occurs during the document initialization.

merge

public void merge(Context context,
                  Writer writer)
           throws ResourceNotFoundException,
                  ParseErrorException,
                  MethodInvocationException,
                  IOException

The AST node structure is merged with the context to produce the final output.

Parameters:

context - Conext with data elements accessed by template

writer - output writer for rendered template

Throws:

ResourceNotFoundException - if template not found from any available source.

ParseErrorException - if template cannot be parsed due to syntax (or other) error.

MethodInvocationException - When a method on a referenced object in the context could not invoked.

IOException - Might be thrown while rendering.