groovy.text
Class XmlTemplateEngine

java.lang.Object
  groovy.text.TemplateEngine
      groovy.text.XmlTemplateEngine

public class XmlTemplateEngine
extends TemplateEngine

Template engine for use in templating scenarios where both the template source and the expected output are intended to be XML.

Templates may use the normal '${expression}' and '$variable' notations to insert an arbitrary expression into the template. In addition, support is also provided for special tags: <gsp:scriptlet> (for inserting code fragments) and <gsp:expression> (for code fragments which produce output).

Comments and processing instructions will be removed as part of processing and special XML characters such as <, >, " and ' will be escaped using the respective XML notation. The output will also be indented using standard XML pretty printing.

The xmlns namespace definition for gsp: tags will be removed but other namespace definitions will be preserved (but may change to an equivalent position within the XML tree).

Normally, the template source will be in a file but here is a simple example providing the XML template as a string:

 def binding = [firstname:"Jochen", lastname:"Theodorou",
                nickname:"blackdrag", salutation:"Dear"]
 def engine = new groovy.text.XmlTemplateEngine()
 def text = '''\
 <?xml version="1.0" encoding="UTF-8"?>
 <document xmlns:gsp='http://groovy.codehaus.org/2005/gsp' xmlns:foo='baz' type='letter'>
   <gsp:scriptlet>def greeting = "${salutation}est"</gsp:scriptlet>
   <gsp:expression>greeting</gsp:expression>
   <foo:to>$firstname "$nickname" $lastname</foo:to>
   How are you today?
 </document>
 '''
 def template = engine.createTemplate(text).make(binding)
 println template.toString()
 

This example will produce this output:

 <document type='letter'>
 Dearest
 <foo:to xmlns:foo='baz'>
   Jochen &quot;blackdrag&quot; Theodorou
 </foo:to>
 How are you today?
 </document>
 

The XML template engine can also be used as the engine for TemplateServlet by placing the following in your web.xml file (plus a corresponding servlet-mapping element):

 <servlet>
   <servlet-name>XmlTemplate</servlet-name>
   <servlet-class>groovy.servlet.TemplateServlet</servlet-class>
   <init-param>
     <param-name>template.engine</param-name>
     <param-value>groovy.text.XmlTemplateEngine</param-value>
   </init-param>
 </servlet>
 

Author:

Christian Stein, Paul King

Field Summary

static String

DEFAULT_INDENTATION

Constructor Summary

XmlTemplateEngine()

XmlTemplateEngine(String indentation, boolean validating)

XmlTemplateEngine(XmlParser xmlParser, ClassLoader parentLoader)

XmlTemplateEngine(XmlParser xmlParser, GroovyShell groovyShell)

Method Summary

Template	createTemplate(Reader reader)
String	getIndentation()
void	setIndentation(String indentation)
String	toString()

Methods inherited from class groovy.text.TemplateEngine

createTemplate, createTemplate, createTemplate

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_INDENTATION

public static final String DEFAULT_INDENTATION

See Also:

Constant Field Values

Constructor Detail

XmlTemplateEngine

public XmlTemplateEngine()
                  throws SAXException,
                         ParserConfigurationException

Throws:

SAXException

ParserConfigurationException

XmlTemplateEngine

public XmlTemplateEngine(String indentation,
                         boolean validating)
                  throws SAXException,
                         ParserConfigurationException

Throws:

SAXException

ParserConfigurationException

XmlTemplateEngine

public XmlTemplateEngine(XmlParser xmlParser,
                         ClassLoader parentLoader)

XmlTemplateEngine

public XmlTemplateEngine(XmlParser xmlParser,
                         GroovyShell groovyShell)

Method Detail

createTemplate

public Template createTemplate(Reader reader)
                        throws CompilationFailedException,
                               ClassNotFoundException,
                               IOException

Specified by:

createTemplate in class TemplateEngine

Throws:

CompilationFailedException

ClassNotFoundException

IOException

getIndentation

public String getIndentation()

setIndentation

public void setIndentation(String indentation)

toString

public String toString()

Overrides:

toString in class Object