Refactored TrainingResource to use the Provider interface.

Playlists are now generated from a default playlist and regularly
merged with the default playlist to get updates.

Also adding the Question tests that got left out of a previous commit.

1 files changed, 171 insertions, 0 deletions

diff --git a/src/com/p4square/grow/model/Playlist.java b/src/com/p4square/grow/model/Playlist.java
new file mode 100644
index 0000000..79ce68e
--- /dev/null
+++ b/src/com/p4square/grow/model/Playlist.java
@@ -0,0 +1,171 @@
+/*
+ * Copyright 2013 Jesse Morgan
+ */
+
+package com.p4square.grow.model;
+
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Map;
+
+import com.fasterxml.jackson.annotation.JsonAnyGetter;
+import com.fasterxml.jackson.annotation.JsonAnySetter;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+/**
+ * Representation of a user's playlist.
+ *
+ * @author Jesse Morgan <jesse@jesterpm.net>
+ */
+public class Playlist {
+    /**
+     * Map of Chapter ID to map of Video ID to VideoRecord.
+     */
+    private Map<String, Chapter> mPlaylist;
+
+    private Date mLastUpdated;
+
+    /**
+     * Construct an empty playlist.
+     */
+    public Playlist() {
+        mPlaylist = new HashMap<String, Chapter>();
+        mLastUpdated = new Date(0); // Default to a prehistoric date if we don't have one.
+    }
+
+    /**
+     * Find the VideoRecord for a video id.
+     */
+    public VideoRecord find(String videoId) {
+        for (Chapter chapter : mPlaylist.values()) {
+            VideoRecord r = chapter.getVideoRecord(videoId);
+
+            if (r != null) {
+                return r;
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * @return The last modified date of the source playlist.
+     */
+    public Date getLastUpdated() {
+        return mLastUpdated;
+    }
+
+    /**
+     * Set the last updated date.
+     * @param date the new last updated date.
+     */
+    public void setLastUpdated(Date date) {
+        mLastUpdated = date;
+    }
+
+    /**
+     * Add a video to the playlist.
+     */
+    public VideoRecord add(String chapterId, String videoId) {
+        Chapter chapter = mPlaylist.get(chapterId);
+
+        if (chapter == null) {
+            chapter = new Chapter();
+            mPlaylist.put(chapterId, chapter);
+        }
+
+        VideoRecord r = new VideoRecord();
+        chapter.setVideoRecord(videoId, r);
+        return r;
+    }
+
+    /**
+     * Add a Chapter to the Playlist.
+     * @param chapterId The name of the chapter.
+     * @param chapter The Chapter object to add.
+     */
+    @JsonAnySetter
+    public void addChapter(String chapterId, Chapter chapter) {
+        mPlaylist.put(chapterId, chapter);
+    }
+
+    /**
+     * @return a map of chapter id to chapter.
+     */
+    @JsonAnyGetter
+    public Map<String, Chapter> getChaptersMap() {
+        return mPlaylist;
+    }
+
+    /**
+     * @return The last chapter to be completed.
+     */
+    @JsonIgnore
+    public Map<String, Boolean> getChapterStatuses() {
+        Map<String, Boolean> completed = new HashMap<String, Boolean>();
+
+        for (Map.Entry<String, Chapter> entry : mPlaylist.entrySet()) {
+            completed.put(entry.getKey(), entry.getValue().isComplete());
+        }
+
+        return completed;
+    }
+
+    /**
+     * @return true if all required videos in the chapter have been watched.
+     */
+    public boolean isChapterComplete(String chapterId) {
+        Chapter chapter = mPlaylist.get(chapterId);
+        if (chapter != null) {
+            return chapter.isComplete();
+        }
+
+        return false;
+    }
+
+    /**
+     * Merge a playlist into this playlist.
+     *
+     * Merge is accomplished by adding all missing Chapters and VideoRecords to
+     * this playlist.
+     */
+    public void merge(Playlist source) {
+        if (source.getLastUpdated().before(mLastUpdated)) {
+            // Already up to date.
+            return;
+        }
+
+        for (Map.Entry<String, Chapter> entry : source.getChaptersMap().entrySet()) {
+            String chapterName = entry.getKey();
+            Chapter theirChapter = entry.getValue();
+            Chapter myChapter = mPlaylist.get(entry.getKey());
+
+            if (myChapter == null) {
+                // Add entire chapter
+                try {
+                    mPlaylist.put(chapterName, theirChapter.clone());
+                } catch (CloneNotSupportedException e) {
+                    throw new RuntimeException(e); // Unexpected...
+                }
+
+            } else {
+                // Check chapter for missing videos
+                for (Map.Entry<String, VideoRecord> videoEntry : theirChapter.getVideos().entrySet()) {
+                    String videoId = videoEntry.getKey();
+                    VideoRecord myVideo = myChapter.getVideoRecord(videoId);
+
+                    if (myVideo == null) {
+                        try {
+                            myVideo = videoEntry.getValue().clone();
+                            myChapter.setVideoRecord(videoId, myVideo);
+                        } catch (CloneNotSupportedException e) {
+                            throw new RuntimeException(e); // Unexpected...
+                        }
+                    }
+                }
+            }
+        }
+
+        mLastUpdated = source.getLastUpdated();
+    }
+}