Refactor existing adapters into a generic superclass

This commit also moves various blog classes into their own packages and
makes the required visibility changes.

briar-android/src/org/briarproject/android/blogs/BlogItem.java

@@ -1,40 +1,14 @@
 package org.briarproject.android.blogs;
 
 import org.briarproject.api.blogs.Blog;
-import org.briarproject.api.blogs.BlogPostHeader;
-
-import java.util.Collection;
 
 class BlogItem {
 
 	private final Blog blog;
-	private final int postCount;
-	private final long timestamp;
-	private final int unread;
 	private final boolean ours, removable;
 
-	BlogItem(Blog blog, Collection<BlogPostHeader> headers, boolean ours,
-			boolean removable) {
+	BlogItem(Blog blog, boolean ours, boolean removable) {
 		this.blog = blog;
-		if (headers.isEmpty()) {
-			postCount = 0;
-			timestamp = 0;
-			unread = 0;
-		} else {
-			BlogPostHeader newest = null;
-			long timestamp = -1;
-			int unread = 0;
-			for (BlogPostHeader h : headers) {
-				if (h.getTimestamp() > timestamp) {
-					timestamp = h.getTimestamp();
-					newest = h;
-				}
-				if (!h.isRead()) unread++;
-			}
-			this.postCount = headers.size();
-			this.timestamp = newest.getTimestamp();
-			this.unread = unread;
-		}
 		this.ours = ours;
 		this.removable = removable;
 	}
@@ -47,22 +21,6 @@ class BlogItem {
 		return blog.getName();
 	}
 
-	boolean isEmpty() {
-		return postCount == 0;
-	}
-
-	int getPostCount() {
-		return postCount;
-	}
-
-	long getTimestamp() {
-		return timestamp;
-	}
-
-	int getUnreadCount() {
-		return unread;
-	}
-
 	boolean isOurs() {
 		return ours;
 	}