Add processor for updated Sones

[Sone.git] / src / main / kotlin / net / pterodactylus / sone / core / UpdatedSoneProcessor.kt

diff --git a/src/main/kotlin/net/pterodactylus/sone/core/UpdatedSoneProcessor.kt b/src/main/kotlin/net/pterodactylus/sone/core/UpdatedSoneProcessor.kt
new file mode 100644 (file)
index 0000000..17948c5
--- /dev/null
+++ b/src/main/kotlin/net/pterodactylus/sone/core/UpdatedSoneProcessor.kt
@@ -0,0 +1,68 @@
+package net.pterodactylus.sone.core
+
+import com.google.common.eventbus.EventBus
+import com.google.inject.ImplementedBy
+import net.pterodactylus.sone.core.event.NewPostFoundEvent
+import net.pterodactylus.sone.core.event.NewPostReplyFoundEvent
+import net.pterodactylus.sone.core.event.PostRemovedEvent
+import net.pterodactylus.sone.core.event.PostReplyRemovedEvent
+import net.pterodactylus.sone.data.Sone
+import net.pterodactylus.sone.data.Sone.SoneStatus
+import net.pterodactylus.sone.database.Database
+import net.pterodactylus.sone.utils.ifFalse
+import net.pterodactylus.util.logging.Logging
+import javax.inject.Inject
+
+/**
+ * An `UpdatedSoneProcessor` is called to process a [Sone] after it has been
+ * downloaded from Freenet.
+ */
+@ImplementedBy(DefaultUpdateSoneProcessor::class)
+interface UpdatedSoneProcessor {
+
+       fun updateSone(sone: Sone)
+
+}
+
+abstract class BasicUpdateSoneProcessor(private val database: Database, private val eventBus: EventBus) :
+               UpdatedSoneProcessor {
+
+       private val logger = Logging.getLogger(UpdatedSoneProcessor::javaClass.name)!!
+
+       override fun updateSone(sone: Sone) {
+               val storedSone = database.getSone(sone.id) ?: return
+               if (!soneCanBeUpdated(storedSone, sone)) {
+                       logger.fine { "Downloaded Sone $sone can not update stored Sone $storedSone." }
+                       return
+               }
+               collectEventsForChanges(storedSone, sone)
+                               .also { database.storeSone(sone) }
+                               .forEach(eventBus::post)
+               sone.options = storedSone.options
+               sone.isKnown = storedSone.isKnown
+               sone.status = if (sone.time != 0L) SoneStatus.idle else SoneStatus.unknown
+       }
+
+       protected abstract fun soneCanBeUpdated(storedSone: Sone, newSone: Sone): Boolean
+
+       private val Sone.followingTime get() = database.getFollowingTime(id) ?: 0
+
+       private fun collectEventsForChanges(oldSone: Sone, newSone: Sone): List<Any> =
+                       SoneChangeCollector(oldSone)
+                                       .onNewPost { post -> if (post.time <= newSone.followingTime) post.isKnown = true }
+                                       .newPostEvent { post -> post.isKnown.ifFalse { NewPostFoundEvent(post) } }
+                                       .removedPostEvent { PostRemovedEvent(it) }
+                                       .onNewPostReply { postReply -> if (postReply.time <= newSone.followingTime) postReply.isKnown = true }
+                                       .newPostReplyEvent { postReply -> postReply.isKnown.ifFalse { NewPostReplyFoundEvent(postReply) } }
+                                       .onRemovedPostReply { PostReplyRemovedEvent(it) }
+                                       .detectChanges(newSone)
+
+}
+
+class DefaultUpdateSoneProcessor @Inject constructor(database: Database, eventBus: EventBus) :
+               BasicUpdateSoneProcessor(database, eventBus) {
+
+       override fun soneCanBeUpdated(storedSone: Sone, newSone: Sone) =
+                       newSone.time > storedSone.time
+
+}