src/main/kotlin/net/pterodactylus/sone/template/LinkedElementRenderFilter.kt

   1 package net.pterodactylus.sone.template
   2
   3 import net.pterodactylus.sone.core.LinkedElement
   4 import net.pterodactylus.sone.utils.asTemplate
   5 import net.pterodactylus.util.template.Filter
   6 import net.pterodactylus.util.template.TemplateContext
   7 import net.pterodactylus.util.template.TemplateContextFactory
   8 import java.io.StringWriter
   9 import javax.inject.Inject
  10
  11 /**
  12  * Renders all kinds of [LinkedElement]s.
  13  */
  14 class LinkedElementRenderFilter @Inject constructor(private val templateContextFactory: TemplateContextFactory): Filter {
  15
  16         companion object {
  17                 private val loadedImageTemplate = """<%include linked/image.html>""".asTemplate()
  18                 private val loadedHtmlPageTemplate = """<%include linked/html-page.html>""".asTemplate()
  19                 private val notLoadedImageTemplate = """<%include linked/notLoaded.html>""".asTemplate()
  20         }
  21
  22         override fun format(templateContext: TemplateContext?, data: Any?, parameters: Map<String, Any?>?) =
  23                         when {
  24                                 data is LinkedElement && data.loading -> renderNotLoadedLinkedElement(data)
  25                                 data is LinkedElement && data.properties["type"] == "image" -> renderLinkedImage(data)
  26                                 data is LinkedElement && data.properties["type"] == "html" -> renderHtmlPage(data)
  27                                 else -> null
  28                         }
  29
  30         private fun renderLinkedImage(linkedElement: LinkedElement) =
  31                         StringWriter().use {
  32                                 val templateContext = templateContextFactory.createTemplateContext()
  33                                 templateContext["link"] = linkedElement.link
  34                                 it.also { loadedImageTemplate.render(templateContext, it) }
  35                         }.toString()
  36
  37         private fun renderHtmlPage(linkedElement: LinkedElement) =
  38                         StringWriter().use {
  39                                 val templateContext = templateContextFactory.createTemplateContext()
  40                                 templateContext["link"] = linkedElement.link
  41                                 templateContext["title"] = linkedElement.properties["title"] ?: "No title"
  42                                 templateContext["description"] = linkedElement.properties["description"] ?: "No description"
  43                                 it.also { loadedHtmlPageTemplate.render(templateContext, it) }
  44                         }.toString()
  45
  46         private fun renderNotLoadedLinkedElement(linkedElement: LinkedElement) =
  47                         StringWriter().use {
  48                                 val templateContext = templateContextFactory.createTemplateContext()
  49                                 templateContext["link"] = linkedElement.link
  50                                 it.also { notLoadedImageTemplate.render(templateContext, it) }
  51                         }.toString()
  52
  53 }