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

Fields
`static String` `DEFAULT_INDENTATION`

### Constructor Summary

Constructors
Constructor and Description
`XmlTemplateEngine()`
`XmlTemplateEngine(String indentation, boolean validating)`
`XmlTemplateEngine(XmlParser xmlParser, ClassLoader parentLoader)`
`XmlTemplateEngine(XmlParser xmlParser, GroovyShell groovyShell)`

### Method Summary

Methods
`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`