org.springframework.web.servlet.view.xslt
Class AbstractXsltView

java.lang.Object
  org.springframework.context.support.ApplicationObjectSupport
      org.springframework.web.context.support.WebApplicationObjectSupport
          org.springframework.web.servlet.view.AbstractView
              org.springframework.web.servlet.view.xslt.AbstractXsltView

All Implemented Interfaces:

ApplicationContextAware, BeanNameAware, View

public abstract class AbstractXsltView

extends AbstractView

Convenient superclass for views rendered using an XSLT stylesheet. Subclasses must provide the XML W3C document to transform. They do not need to concern themselves with XSLT.

Properties:

• stylesheet: no transform is null
• root: name of the root element
• uriResolver: URIResolver used in the transform
• cache (optional, default=true): debug setting only

Setting cache to false will cause the templates object to be reloaded for each rendering. This is useful during development, but will seriously affect performance in production and isn't threadsafe.

Author:

Rod Johnson, Darren Davison

Field Summary

static java.lang.String

DEFAULT_ROOT

Fields inherited from class org.springframework.web.servlet.view.AbstractView

DEFAULT_CONTENT_TYPE

Fields inherited from class org.springframework.context.support.ApplicationObjectSupport

logger

Constructor Summary

AbstractXsltView()

Method Summary

protected abstract org.w3c.dom.Node	createDomNode(java.util.Map model, java.lang.String root, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Return the XML node to transform.
protected void	doTransform(java.util.Map model, org.w3c.dom.Node dom, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Perform the actual transformation, writing to the HTTP response.
protected void	doTransform(org.w3c.dom.Node dom, java.util.Map parameters, javax.xml.transform.Result result, java.lang.String encoding) Perform the actual transformation, writing to the given result.
protected java.util.Map	getParameters() Return a Map of parameters to be applied to the stylesheet.
protected java.util.Map	getParameters(javax.servlet.http.HttpServletRequest request) Return a Map of parameters to be applied to the stylesheet.
protected javax.xml.transform.Source	getStylesheetSource(Resource stylesheetLocation) Load the stylesheet.
protected void	initApplicationContext() Here we load our template, as we need the ApplicationContext to do it.
protected void	renderMergedOutputModel(java.util.Map model, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Subclasses must implement this method to actually render the view.
void	setCache(boolean cache) Set whether to activate the cache.
void	setRoot(java.lang.String root) Document root element name.
void	setStylesheetLocation(Resource stylesheetLocation) Set the location of the XSLT stylesheet.
void	setUriResolver(javax.xml.transform.URIResolver uriResolver) Set the URIResolver used in the transform.

Methods inherited from class org.springframework.web.servlet.view.AbstractView

addStaticAttribute, createRequestContext, getAttributesMap, getBeanName, getContentType, getRequestContextAttribute, getStaticAttributes, render, setAttributes, setAttributesCSV, setAttributesMap, setBeanName, setContentType, setRequestContextAttribute

Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport

getServletContext, getTempDir, getWebApplicationContext

Methods inherited from class org.springframework.context.support.ApplicationObjectSupport

getApplicationContext, getMessageSourceAccessor, requiredContextClass, setApplicationContext

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_ROOT

public static final java.lang.String DEFAULT_ROOT

See Also:

Constant Field Values

Constructor Detail

AbstractXsltView

public AbstractXsltView()

Method Detail

setStylesheetLocation

public void setStylesheetLocation(Resource stylesheetLocation)

Set the location of the XSLT stylesheet.

Parameters:

stylesheetLocation - the location of the XSLT stylesheet

See Also:

ResourceLoader.getResource(java.lang.String)

setRoot

public void setRoot(java.lang.String root)

Document root element name. Default is "DocRoot". Only used if we're not passed a single Node as model.

Parameters:

root - document root element name

See Also:

DEFAULT_ROOT

setUriResolver

public void setUriResolver(javax.xml.transform.URIResolver uriResolver)

Set the URIResolver used in the transform. The URIResolver handles calls to the XSLT document() function. This method can be used by subclasses or as a bean property.

Parameters:

uriResolver - URIResolver to set. No URIResolver will be set if this is null (this is the default).

setCache

public void setCache(boolean cache)

Set whether to activate the cache. Default is true.

initApplicationContext

protected final void initApplicationContext()
                                     throws ApplicationContextException

Here we load our template, as we need the ApplicationContext to do it.

Overrides:

initApplicationContext in class ApplicationObjectSupport

Throws:

ApplicationContextException - in case of initialization errors

getStylesheetSource

protected javax.xml.transform.Source getStylesheetSource(Resource stylesheetLocation)
                                                  throws ApplicationContextException

Load the stylesheet. Subclasses can override this.

Throws:

ApplicationContextException

renderMergedOutputModel

protected final void renderMergedOutputModel(java.util.Map model,
                                             javax.servlet.http.HttpServletRequest request,
                                             javax.servlet.http.HttpServletResponse response)
                                      throws java.lang.Exception

Description copied from class: AbstractView

Subclasses must implement this method to actually render the view.

The first step will be preparing the request: In the JSP case, this would mean setting model objects as request attributes. The second step will be the actual rendering of the view, for example including the JSP via a RequestDispatcher.

Specified by:

renderMergedOutputModel in class AbstractView

Parameters:

model - combined output Map, with dynamic values taking precedence over static attributes

request - current HTTP request

response - current HTTP response

Throws:

java.lang.Exception - if rendering failed

createDomNode

protected abstract org.w3c.dom.Node createDomNode(java.util.Map model,
                                                  java.lang.String root,
                                                  javax.servlet.http.HttpServletRequest request,
                                                  javax.servlet.http.HttpServletResponse response)
                                           throws java.lang.Exception

Return the XML node to transform. Subclasses must implement this method.

Parameters:

model - the model Map

root - name for root element. This can be supplied as a bean property to concrete subclasses within the view definition file, but will be overridden in the case of a single object in the model map to be the key for that object. If no root property is specified and multiple model objects exist, a default root tag name will be supplied.

request - HTTP request. Subclasses won't normally use this, as request processing should have been complete. However, we might to create a RequestContext to expose as part of the model.

response - HTTP response. Subclasses won't normally use this, however there may sometimes be a need to set cookies.

Returns:

the XML node to transform

Throws:

java.lang.Exception - we let this method throw any exception; the AbstractXlstView superclass will catch exceptions

doTransform

protected void doTransform(java.util.Map model,
                           org.w3c.dom.Node dom,
                           javax.servlet.http.HttpServletRequest request,
                           javax.servlet.http.HttpServletResponse response)
                    throws java.lang.Exception

Perform the actual transformation, writing to the HTTP response.

Default implementation delegates to the doTransform version that takes a Result argument, building a StreamResult for the ServletResponse OutputStream.

Parameters:

model - the model Map

dom - the XNL node to transform

request - current HTTP request

response - current HTTP response

Throws:

java.lang.Exception - we let this method throw any exception; the AbstractXlstView superclass will catch exceptions

See Also:

doTransform(Node, Map, Result, String), StreamResult, ServletResponse.getOutputStream()

doTransform

protected void doTransform(org.w3c.dom.Node dom,
                           java.util.Map parameters,
                           javax.xml.transform.Result result,
                           java.lang.String encoding)
                    throws java.lang.Exception

Perform the actual transformation, writing to the given result.

Parameters:

dom - the XML node to transform

parameters - a Map of parameters to be applied to the stylesheet

result - the result to write to

Throws:

java.lang.Exception - we let this method throw any exception; the AbstractXlstView superclass will catch exceptions

getParameters

protected java.util.Map getParameters(javax.servlet.http.HttpServletRequest request)

Return a Map of parameters to be applied to the stylesheet. Subclasses can override this method in order to apply one or more parameters to the transformation process.

Default implementation delegates to simple getParameter version.

Parameters:

request - current HTTP request

Returns:

a Map of parameters to apply to the transformation process

See Also:

getParameters(), Transformer.setParameter(java.lang.String, java.lang.Object)

getParameters

protected java.util.Map getParameters()

Return a Map of parameters to be applied to the stylesheet. Subclasses can override this method in order to apply one or more parameters to the transformation process.

Default implementation delegates simply returns null.

Returns:

a Map of parameters to apply to the transformation process

See Also:

getParameters(HttpServletRequest), Transformer.setParameter(java.lang.String, java.lang.Object)