Add template plugin that extracts the page number from the request.

diff --git a/src/main/java/net/pterodactylus/sone/template/GetPagePlugin.java b/src/main/java/net/pterodactylus/sone/template/GetPagePlugin.java
new file mode 100644 (file)
index 0000000..c57932e
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+++ b/src/main/java/net/pterodactylus/sone/template/GetPagePlugin.java
@@ -0,0 +1,64 @@
+/*
+ * Sone - GetPagePlugin.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.template;
+
+import java.util.Map;
+
+import net.pterodactylus.sone.web.page.Page.Request;
+import net.pterodactylus.util.template.DataProvider;
+import net.pterodactylus.util.template.Plugin;
+
+/**
+ * Extracts a page number from a {@link Request}’s parameters and stores it in a
+ * {@link DataProvider}.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class GetPagePlugin implements Plugin {
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public void execute(DataProvider dataProvider, Map<String, String> parameters) {
+               String requestKey = parameters.get("request");
+               String parameter = parameters.get("parameter");
+               String pageKey = parameters.get("key");
+
+               if (requestKey == null) {
+                       requestKey = "request";
+               }
+               if (parameter == null) {
+                       parameter = "page";
+               }
+               if (pageKey == null) {
+                       pageKey = "page";
+               }
+
+               Request request = (Request) dataProvider.getData(requestKey);
+               String pageString = request.getHttpRequest().getParam(parameter);
+               int page = 0;
+               try {
+                       page = Integer.parseInt(pageString);
+               } catch (NumberFormatException nfe1) {
+                       /* ignore. */
+               }
+               dataProvider.setData(pageKey, page);
+       }
+
+}