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TransformerWriter.scala
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TransformerWriter.scala
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/**
* Copyright (C) 2009-2011 the original author or authors.
* See the notice.md file distributed with this work for additional
* information regarding copyright ownership.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.fusesource.scalate.rest
import java.io.OutputStream
import java.lang.annotation.Annotation
import java.lang.reflect.Type
import java.net.URL
import javax.ws.rs.ext.{ MessageBodyWriter, Provider }
import javax.servlet.ServletContext
import javax.ws.rs.core.{ Context, MultivaluedMap, MediaType }
import org.fusesource.scalate.scuery.Transformer
import org.fusesource.scalate.servlet.{ ServletHelper, TemplateEngineServlet }
import com.sun.jersey.api.core.ExtendedUriInfo
import com.sun.jersey.api.container.ContainerException
import scala.collection.JavaConverters._
import xml.{ XML, NodeSeq }
import javax.servlet.http.{ HttpServletResponse, HttpServletRequest }
import org.fusesource.scalate.util.{ Log, ResourceNotFoundException }
object TransformerWriter extends Log
/**
* Converts an Scuery [[org.fusesource.scalate.scuery.Transformer]] to output
*
* @version $Revision : 1.1 $
*/
@Provider
class TransformerWriter extends MessageBodyWriter[Transformer] {
import TransformerWriter._
@Context
protected var uriInfo: ExtendedUriInfo = _
@Context
protected var _servletContext: ServletContext = _
@Context
protected var request: HttpServletRequest = _
@Context
protected var response: HttpServletResponse = _
protected var errorUris: List[String] = ServletHelper.errorUris()
protected def templateDirectories = TemplateEngineServlet().templateEngine.templateDirectories
def isWriteable(
aClass: Class[_],
aType: Type,
annotations: Array[Annotation],
mediaType: MediaType) = {
classOf[Transformer].isAssignableFrom(aClass)
}
def getSize(
transformer: Transformer,
aClass: Class[_],
aType: Type,
annotations: Array[Annotation],
mediaType: MediaType) = -1L
def writeTo(
transformer: Transformer,
aClass: Class[_],
aType: Type,
annotations: Array[Annotation],
mediaType: MediaType,
httpHeaders: MultivaluedMap[String, Object],
out: OutputStream): Unit = {
/*
println("aClass: " + aClass.getName)
println("transformer: " + transformer)
println("uriInfo: " + uriInfo)
*/
if (uriInfo != null) {
var viewName = "index"
val matchedTemplates = uriInfo.getMatchedTemplates().asScala
if (!matchedTemplates.isEmpty) {
val lastTemplate = matchedTemplates.head
val pathVariables = lastTemplate.getTemplateVariables()
if (pathVariables.isEmpty) {
val segments = lastTemplate.getTemplate.split("/").filter(_.length > 0)
if (!segments.isEmpty) {
viewName = segments.last
}
}
}
val resources = uriInfo.getMatchedResources.asScala
if (!resources.isEmpty) {
val resource = resources.head
val className = resource.getClass.getName
debug("resource class: " + className)
debug("viewName: " + viewName)
try {
val templateName = "/" + className.replace('.', '/') + "." + viewName + ".html"
val answer = render(templateName, transformer).toString
// Ensure headers are committed
out.flush()
out.write(answer.getBytes)
} catch {
case e: Exception =>
// lets forward to the error handler
val servlet = TemplateEngineServlet()
var notFound = true
for (uri <- errorUris if notFound) {
if (servletContext.getResource(uri) != null) {
// we need to expose all the errors property here...
request.setAttribute("javax.servlet.error.exception", e)
request.setAttribute("javax.servlet.error.exception_type", e.getClass)
request.setAttribute("javax.servlet.error.message", e.getMessage)
request.setAttribute("javax.servlet.error.request_uri", request.getRequestURI)
request.setAttribute("javax.servlet.error.servlet_name", request.getServerName)
// TODO how to get the status code???
val status = 500
request.setAttribute("javax.servlet.error.status_code", status)
request.setAttribute("it", e)
servlet.render(uri, request, response)
notFound = false
}
}
if (notFound) {
throw new ContainerException(e)
}
}
}
/*
println("matchedURIs: " + uriInfo.getMatchedURIs)
println("getPath: " + uriInfo.getPath)
println("getPathSegments: " + uriInfo.getPathSegments().map(s => "" + s.getPath + " " + s.getMatrixParameters()))
println("getMatchedResults: " + uriInfo.getMatchedResults())
println("getMatchedTemplates: " + uriInfo.getMatchedTemplates())
println("getPathParameters: " + uriInfo.getPathParameters)
*/
}
}
/**
* Renders the given template URI using the given ScQuery transformer
*/
protected def render(template: String, transformer: Transformer): NodeSeq = {
// lets load the template as XML...
findResource(template) match {
case Some(u) =>
val xml = XML.load(u)
// TODO report nice errors here if we can't parse it!!!
transformer(xml)
case _ => throw new ResourceNotFoundException(template)
}
}
protected def findResource(path: String): Option[URL] = {
var answer: Option[URL] = None
for (dir <- templateDirectories if answer.isEmpty) {
val t = dir + path
debug("Trying to find template: " + t)
val u = servletContext.getResource(t)
debug("Found: " + u)
if (u != null) {
answer = Some(u)
}
}
answer
}
/**
* Returns the servlet context injected by JAXRS
*/
protected def servletContext: ServletContext = {
if (_servletContext == null) {
throw new IllegalArgumentException("servletContext not injected")
}
_servletContext
}
}