Add voting on rants

Author: LucaScorpion

src/main/java/com/scorpiac/javarant/DevRant.java

@@ -240,6 +240,30 @@ public User getUser(int id) {
         return new User(this, id);
     }
 
+    /**
+     * Vote on a rant.
+     *
+     * @param rant The rant to vote on.
+     * @param vote The vote.
+     * @return Whether the vote was successful.
+     */
+    public boolean vote(Rant rant, Vote vote) {
+        return voteRant(rant.getId(), vote);
+    }
+
+    /**
+     * Vote on a rant.
+     *
+     * @param id   The id of the rant.
+     * @param vote The vote.
+     * @return Whether the vote was successful.
+     */
+    public boolean voteRant(int id, Vote vote) {
+        // Rants url, id, vote.
+        String url = String.format("%1$s/%2$d%3$s", API_RANTS, id, API_VOTE);
+        return Util.jsonSuccess(post(url, new BasicNameValuePair("vote", String.valueOf(vote.getValue()))));
+    }
+
     /**
      * Make a POST-request to the devRant server.
      *

src/main/java/com/scorpiac/javarant/Vote.java

@@ -0,0 +1,17 @@
+package com.scorpiac.javarant;
+
+public enum Vote {
+    UP(1),
+    NONE(0),
+    DOWN(-1);
+
+    private final int value;
+
+    private Vote(int value) {
+        this.value = value;
+    }
+
+    public int getValue() {
+        return value;
+    }
+}