Add abstract basic Command implementation with helper methods.

diff --git a/src/main/java/net/pterodactylus/sone/freenet/fcp/AbstractCommand.java b/src/main/java/net/pterodactylus/sone/freenet/fcp/AbstractCommand.java
new file mode 100644 (file)
index 0000000..8c155e5
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sone/freenet/fcp/AbstractCommand.java
@@ -0,0 +1,55 @@
+/*
+ * Sone - AbstractCommand.java - Copyright © 2011 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.freenet.fcp;
+
+import freenet.node.FSParseException;
+import freenet.support.SimpleFieldSet;
+
+/**
+ * Basic implementation of a {@link Command} with various helper methods to
+ * simplify processing of input parameters.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public abstract class AbstractCommand implements Command {
+
+       //
+       // PROTECTED METHODS
+       //
+
+       /**
+        * Returns a String value from the given simple field set.
+        *
+        * @param simpleFieldSet
+        *            The simple field set to get the value from
+        * @param key
+        *            The key of the value
+        * @return The String value
+        * @throws FcpException
+        *             if there is no value for the given key in the simple field
+        *             set, or the value can not be converted to a String
+        */
+       protected String getString(SimpleFieldSet simpleFieldSet, String key) throws FcpException {
+               try {
+                       return simpleFieldSet.getString(key);
+               } catch (FSParseException fspe1) {
+                       throw new FcpException("Could not get parameter “" + key + "” as String.", fspe1);
+               }
+       }
+
+}