## org.codehaus.groovy.grails.web.pages
Class GroovyPagesTemplateEngine

    java.lang.Object
      groovy.text.TemplateEngine
          org.codehaus.groovy.grails.support.ResourceAwareTemplateEngine
              org.codehaus.groovy.grails.web.pages.GroovyPagesTemplateEngine

All Implemented Interfaces:
  ApplicationContextAware, ServletContextAware

    public class GroovyPagesTemplateEngine

extends ResourceAwareTemplateEngine
implements ApplicationContextAware, ServletContextAware

A GroovyPagesTemplateEngine based on (but not extending) the existing TemplateEngine implementations within Groovy. It allows GSP pages to be re-used in different context using code like the below: `Template t = new GroovyPagesTemplateEngine() .createTemplate(context,request,response); t.make() .writeTo(out);`

Since:
  0.1 Created: 12-Jan-2006
Author:
  Graeme Rocher

Field Summary
`static String` `BEAN_ID`
`static String` `RESOURCE_LOADER_BEAN_ID`

Constructor Summary
`GroovyPagesTemplateEngine()`
`GroovyPagesTemplateEngine(ServletContext servletContext)`

Method Summary
`protected GroovyPageMetaInfo` `buildPageMetaInfo(InputStream inputStream, Resource res, String pageName)` Constructs a GroovyPageMetaInfo instance which holds the script class, modified date and so on
`int[]` `calculateLineNumbersForPage(ServletContext context, String url)` Retrieves a line number matrix for the specified page that can be used to retrieve the actual line number within the GSP page if the line number within the compiled GSP is known
`void` `clearPageCache()` Clears the page cache.
`groovy.text.Template` `createTemplate()` Creates a Template for the currently executing Request
`groovy.text.Template` `createTemplate(File file)` Creates a Template for the given file
`groovy.text.Template` `createTemplate(InputStream inputStream)` Create a Template for the given InputStream
`protected groovy.text.Template` `createTemplate(InputStream inputStream, Resource resource, String pageName)` Constructs a Groovy Template from the given InputStream and Spring Resource object
`groovy.text.Template` `createTemplate(Resource resource)` Creates a Template for the given Spring Resource instance
`groovy.text.Template` `createTemplate(String uri)` Creates a Template using the given URI.
`groovy.text.Template` `createTemplate(String txt, String pageName)` Creates a Template using the given text for the Template and the given name.
`groovy.text.Template` `createTemplate(URL url)` Creates a Template for the given URL
`protected String` `establishPageName(Resource res, String pageName)` Establishes the name to use for the given resource
`protected String` `getCurrentRequestUri(HttpServletRequest request)` Return the page identifier.
`Resource` `getResourceForUri(String uri)` Attempts to retrieve a reference to a GSP as a Spring Resource instance for the given URI.
`protected String` `getUriWithinGrailsViews(String relativeUri)` Returns the path to the view of the relative URI within the Grails views directory
`boolean` `isReloadEnabled()` Return whether reload is enabled for the GroovyPagesTemplateEngine
`void` `setApplicationContext(ApplicationContext applicationContext)` Sets the ResourceLoader from the ApplicationContext
`void` `setClassLoader(groovy.lang.GroovyClassLoader classLoader)` Sets the ClassLoader that the TemplateEngine should use to
`void` `setJspTagLibraryResolver(org.codehaus.groovy.grails.web.pages.ext.jsp.TagLibraryResolver jspTagLibraryResolver)`
`void` `setReloadEnabled(boolean b)` Sets whether reloading is enabled
`void` `setResourceLoader(ResourceLoader resourceLoader)` Sets a custom ResourceLoader that will be used to load GSPs for URIs
`void` `setServletContext(ServletContext servletContext)`
`void` `setTagLibraryLookup(TagLibraryLookup tagLibraryLookup)`

Methods inherited from class org.codehaus.groovy.grails.support.ResourceAwareTemplateEngine
`createTemplate`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### BEAN_ID

    public static final String BEAN_ID

See Also:
  Constant Field Values

### RESOURCE_LOADER_BEAN_ID

    public static final String RESOURCE_LOADER_BEAN_ID

See Also:
  Constant Field Values

Constructor Detail

### GroovyPagesTemplateEngine

    public GroovyPagesTemplateEngine()

### GroovyPagesTemplateEngine

    public GroovyPagesTemplateEngine(ServletContext servletContext)

Method Detail

### setTagLibraryLookup

    public void setTagLibraryLookup(TagLibraryLookup tagLibraryLookup)

### setJspTagLibraryResolver

    public void setJspTagLibraryResolver(org.codehaus.groovy.grails.web.pages.ext.jsp.TagLibraryResolver jspTagLibraryResolver)

### setClassLoader

    public void setClassLoader(groovy.lang.GroovyClassLoader classLoader)

  Sets the ClassLoader that the TemplateEngine should use to

  Parameters:
    `classLoader` - The ClassLoader to use when compilation of Groovy Pages occurs

### setResourceLoader

    public void setResourceLoader(ResourceLoader resourceLoader)

  Sets a custom ResourceLoader that will be used to load GSPs for URIs

  Parameters:
    `resourceLoader` - The ResourceLoader instance

### calculateLineNumbersForPage

    public int[] calculateLineNumbersForPage(ServletContext context,
                                             String url)

  Retrieves a line number matrix for the specified page that can be used to retrieve the actual line number within the GSP page if the line number within the compiled GSP is known

  Parameters:
    `context` - The ServletContext instance
    `url` - The URL of the page
  Returns:
    An array where the index is the line number witin the compiled GSP and the value is the line number within the source

### createTemplate

    public groovy.text.Template createTemplate(Resource resource)

  Creates a Template for the given Spring Resource instance

  Overrides:
    `createTemplate` in class `ResourceAwareTemplateEngine`
  Parameters:
    `resource` - The Resource to create the Template for
  Returns:
    The Template instance

### createTemplate

    public groovy.text.Template createTemplate(String uri)

  Creates a Template using the given URI.

  Overrides:
    `createTemplate` in class `groovy.text.TemplateEngine`
  Parameters:
    `uri` - The URI of the page to create the template for
  Returns:
    The Template instance
  Throws:
    `org.codehaus.groovy.control.CompilationFailedException`

### createTemplate

    public groovy.text.Template createTemplate(String txt,
                                               String pageName)
                                        throws IOException

  Creates a Template using the given text for the Template and the given name. The name of the template is required

  Parameters:
    `txt` - The URI of the page to create the template for
    `pageName` - The name of the page being parsed
  Returns:
    The Template instance
  Throws:
    `org.codehaus.groovy.control.CompilationFailedException`
    `IOException` - Thrown if an IO exception occurs creating the Template

### createTemplate

    public groovy.text.Template createTemplate()
                                        throws IOException,
                                               ClassNotFoundException

  Creates a Template for the currently executing Request

  Returns:
    The Template for the currently executing request
  Throws:
    `IOException` - Thrown when an exception occurs Reading the Template
    `ClassNotFoundException` - Thrown when the class of the template was not found

### createTemplate

    public groovy.text.Template createTemplate(File file)
                                        throws org.codehaus.groovy.control.CompilationFailedException,
                                               ClassNotFoundException,
                                               IOException

  Creates a Template for the given file

  Overrides:
    `createTemplate` in class `groovy.text.TemplateEngine`
  Parameters:
    `file` - The File to use to construct the template with
  Returns:
    A Groovy Template instance
  Throws:
    `org.codehaus.groovy.control.CompilationFailedException` - When an error occured compiling the Template
    `ClassNotFoundException` - When a Class cannot be found within the given Template
    `IOException` - When a I/O Exception occurs reading the Template

### createTemplate

    public groovy.text.Template createTemplate(URL url)
                                        throws org.codehaus.groovy.control.CompilationFailedException,
                                               ClassNotFoundException,
                                               IOException

  Creates a Template for the given URL

  Overrides:
    `createTemplate` in class `groovy.text.TemplateEngine`
  Parameters:
    `url` - The URL to use to construct the template with
  Returns:
    A Groovy Template instance
  Throws:
    `org.codehaus.groovy.control.CompilationFailedException` - When an error occured compiling the Template
    `ClassNotFoundException` - When a Class cannot be found within the given Template
    `IOException` - When a I/O Exception occurs reading the Template

### createTemplate

    public groovy.text.Template createTemplate(InputStream inputStream)

  Create a Template for the given InputStream

  Specified by:
    `createTemplate` in class `ResourceAwareTemplateEngine`
  Parameters:
    `inputStream` - The InputStream to create the Template for
  Returns:
    The Template instance

### createTemplate

    protected groovy.text.Template createTemplate(InputStream inputStream,
                                                  Resource resource,
                                                  String pageName)

  Constructs a Groovy Template from the given InputStream and Spring Resource object

  Parameters:
    `inputStream` - The InputStream to use
    `resource` - The Resource to use
    `pageName` - The name of the page
  Returns:
    The Groovy Template

### isReloadEnabled

    public boolean isReloadEnabled()

  Return whether reload is enabled for the GroovyPagesTemplateEngine

  Returns:
    True if it is

### setReloadEnabled

    public void setReloadEnabled(boolean b)

  Sets whether reloading is enabled

  Parameters:
    `b` - True if it is enabled

### getResourceForUri

    public Resource getResourceForUri(String uri)

  Attempts to retrieve a reference to a GSP as a Spring Resource instance for the given URI.

  Parameters:
    `uri` - The URI to check
  Returns:
    A Resource instance

### buildPageMetaInfo

    protected GroovyPageMetaInfo buildPageMetaInfo(InputStream inputStream,
                                                   Resource res,
                                                   String pageName)

  Constructs a GroovyPageMetaInfo instance which holds the script class, modified date and so on

  Parameters:
    `inputStream` - The InputStream to construct the GroovyPageMetaInfo instance from
    `res` - The Spring Resource to construct the MetaInfo from
    `pageName` - The name of the page (can be null, in which case method responsible for calculating appropriate alternative)
  Returns:
    The GroovyPageMetaInfo instance

### establishPageName

    protected String establishPageName(Resource res,
                                       String pageName)

  Establishes the name to use for the given resource

  Parameters:
    `res` - The Resource to calculate the name for
    `pageName` - The name of the page, can be null, in which case method responsible for calculation
  Returns:
    The name as a String

### setApplicationContext

    public void setApplicationContext(ApplicationContext applicationContext)
                               throws BeansException

  Sets the ResourceLoader from the ApplicationContext

  Specified by:
    `setApplicationContext` in interface `ApplicationContextAware`
  Parameters:
    `applicationContext` - The ApplicationContext
  Throws:
    `BeansException` - Thrown when an error occurs with the ApplicationContext

### getCurrentRequestUri

    protected String getCurrentRequestUri(HttpServletRequest request)

  Return the page identifier.

  Parameters:
    `request` - The HttpServletRequest instance
  Returns:
    The page id

### getUriWithinGrailsViews

    protected String getUriWithinGrailsViews(String relativeUri)

  Returns the path to the view of the relative URI within the Grails views directory

  Parameters:
    `relativeUri` - The relative URI
  Returns:
    The path of the URI within the Grails view directory

### setServletContext

    public void setServletContext(ServletContext servletContext)

  Specified by:
    `setServletContext` in interface `ServletContextAware`

### clearPageCache

    public void clearPageCache()

  Clears the page cache. Views will be re-compiled.

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