#631 - Partial Response : Add java doc

partial-response/src/main/java/com/iluwatar/partialresponse/FieldJsonMapper.java

@@ -24,7 +24,16 @@
 
 package com.iluwatar.partialresponse;
 
+/**
+ * Map a video to json
+ */
 public class FieldJsonMapper {
+
+  /**
+   * @param video  object containing video information
+   * @param fields fields information to get
+   * @return json of required fields from video
+   */
   public String toJson(Video video, String[] fields) {
     return null;
   }

partial-response/src/main/java/com/iluwatar/partialresponse/Video.java

@@ -53,15 +53,18 @@ public class Video {
     this.language = language;
   }
 
+  /**
+   * @return json representaion of video
+   */
   @Override
   public String toString() {
-    return "{" +
-        "\"id\": \"" + id + "\"," +
-        "\"title\": \"" + title + "\"," +
-        "\"length\": " + length + "," +
-        "\"description\": \"" + description + "\"," +
-        "\"director\": \"" + director + "\"," +
-        "\"language\": \"" + language + "\"," +
-        "}";
+    return "{"
+        + "\"id\": \"" + id + "\","
+        + "\"title\": \"" + title + "\","
+        + "\"length\": " + length + ","
+        + "\"description\": \"" + description + "\","
+        + "\"director\": \"" + director + "\","
+        + "\"language\": \"" + language + "\","
+        + "}";
   }
 }

partial-response/src/main/java/com/iluwatar/partialresponse/VideoResource.java

@@ -26,15 +26,28 @@ package com.iluwatar.partialresponse;
 
 import java.util.Map;
 
+/**
+ * The resource class which serves video information.
+ * This class act as server in the demo. Which has all video details.
+ */
 public class VideoResource {
   private FieldJsonMapper fieldJsonMapper;
   private Map<Integer, Video> videos;
 
+  /**
+   * @param fieldJsonMapper map object to json.
+   * @param videos          initialize resource with existing videos. Act as database.
+   */
   public VideoResource(FieldJsonMapper fieldJsonMapper, Map<Integer, Video> videos) {
     this.fieldJsonMapper = fieldJsonMapper;
     this.videos = videos;
   }
 
+  /**
+   * @param id     video id
+   * @param fields fields to get information about
+   * @return json of specified fields of particular video by id
+   */
   public String getDetails(Integer id, String... fields) {
     if (fields.length == 0) {
       return videos.get(id).toString();