create poll in model

app/src/main/java/gr/thmmy/mthmmy/model/Poll.java

@@ -0,0 +1,85 @@
+package gr.thmmy.mthmmy.model;
+
+import java.text.DecimalFormat;
+
+public class Poll {
+    private final String question;
+    private Entry[] entries;
+    private int availableVoteCount;
+    private String pollFormUrl, sc;
+
+    public Poll(String question, Entry[] entries, int availableVoteCount, String pollFormUrl, String sc) {
+        this.question = question;
+        this.entries = entries;
+        this.availableVoteCount = availableVoteCount;
+        this.pollFormUrl = pollFormUrl;
+        this.sc = sc;
+    }
+
+    public String getQuestion() {
+        return question;
+    }
+
+    public Entry[] getEntries() {
+        return entries;
+    }
+
+    public int getAvailableVoteCount() {
+        return availableVoteCount;
+    }
+
+    public String getPollFormUrl() {
+        return pollFormUrl;
+    }
+
+    public String getSc() {
+        return sc;
+    }
+
+    public int totalVotes() {
+        int sum = 0;
+        for (Entry entry : entries) {
+            sum += entry.votes;
+        }
+        return sum;
+    }
+
+    public String getVotePercentage(int index) {
+        DecimalFormat format = new DecimalFormat(".#");
+        double percentage = 100 * ((double) entries[index].votes / (double) totalVotes());
+        return format.format(percentage);
+    }
+
+    static class Entry {
+        private final String entryName;
+        private int votes;
+
+        public Entry(String entryName, int votes) {
+            this.entryName = entryName;
+            this.votes = votes;
+        }
+
+        /**
+         * Constructor for entry with unknown number of votes
+         *
+         * @param entryName
+         * The name of the entry
+         */
+        public Entry(String entryName) {
+            this.entryName = entryName;
+            votes = -1;
+        }
+
+        public String getEntryName() {
+            return entryName;
+        }
+
+        public int getVotes() {
+            return votes;
+        }
+
+        public void setVotes(int votes) {
+            this.votes = votes;
+        }
+    }
+}

app/src/main/java/gr/thmmy/mthmmy/model/Post.java

@@ -15,7 +15,7 @@ import java.util.Objects;
  * gender, number of posts, personal text and number of start to be described <b>in addition to
  * previous fields</b>.</p>
  */
-public class Post {
+public class Post extends TopicItem {
     public static final int TYPE_POST = 0;
     public static final int TYPE_QUICK_REPLY = 1;
     public static final int TYPE_EDIT = 2;

app/src/main/java/gr/thmmy/mthmmy/model/TopicItem.java

@@ -0,0 +1,4 @@
+package gr.thmmy.mthmmy.model;
+
+public class TopicItem {
+}