Add page implementation that delivers a JSON object.

diff --git a/src/main/java/net/pterodactylus/sone/web/ajax/JsonPage.java b/src/main/java/net/pterodactylus/sone/web/ajax/JsonPage.java
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+++ b/src/main/java/net/pterodactylus/sone/web/ajax/JsonPage.java
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+/*
+ * Sone - JsonPage.java - Copyright © 2010 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.web.ajax;
+
+import net.pterodactylus.sone.web.page.Page;
+import net.pterodactylus.util.json.JsonObject;
+import net.pterodactylus.util.json.JsonUtils;
+
+/**
+ * A JSON page is a specialized {@link Page} that will always return a JSON
+ * object to the browser, e.g. for use with AJAX or other scripting frameworks.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public abstract class JsonPage implements Page {
+
+       /** The path of the page. */
+       private final String path;
+
+       /**
+        * Creates a new JSON page at the given path.
+        *
+        * @param path
+        *            The path of the page
+        */
+       public JsonPage(String path) {
+               this.path = path;
+       }
+
+       //
+       // METHODS FOR SUBCLASSES TO OVERRIDE
+       //
+
+       /**
+        * This method is called to create the JSON object that is returned back to
+        * the browser.
+        *
+        * @param request
+        *            The request to handle
+        * @return The created JSON object
+        */
+       protected abstract JsonObject createJsonObject(Request request);
+
+       //
+       // PAGE METHODS
+       //
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public String getPath() {
+               return path;
+       }
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public Response handleRequest(Request request) {
+               JsonObject jsonObject = createJsonObject(request);
+               return new Response(200, "OK", "application/json", JsonUtils.format(jsonObject));
+       }
+
+}