Add FCP command interface.

diff --git a/src/main/java/net/pterodactylus/sone/freenet/fcp/Command.java b/src/main/java/net/pterodactylus/sone/freenet/fcp/Command.java
new file mode 100644 (file)
index 0000000..a4284aa
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sone/freenet/fcp/Command.java
@@ -0,0 +1,179 @@
+/*
+ * Sone - Command.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.support.SimpleFieldSet;
+import freenet.support.api.Bucket;
+
+/**
+ * Implementation of an FCP interface for other clients or plugins to
+ * communicate with Sone.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public interface Command {
+
+       /**
+        * Executes the command, returning a reply that will be sent back to the
+        * requesting plugin.
+        *
+        * @param parameters
+        *            The parameters of the comand
+        * @param data
+        *            The data of the command (may be {@code null})
+        * @param accessType
+        *            The access type
+        * @return A reply to send back to the plugin
+        */
+       public Reply execute(SimpleFieldSet parameters, Bucket data, AccessType accessType);
+
+       /**
+        * The access type of the request.
+        *
+        * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+        */
+       public static enum AccessType {
+
+               /** Access from another plugin. */
+               DIRECT,
+
+               /** Access via restricted FCP. */
+               RESTRICTED_FCP,
+
+               /** Access via FCP with full access. */
+               FULL_FCP,
+
+       }
+
+       /**
+        * Interface for command replies.
+        *
+        * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+        */
+       public static class Reply {
+
+               /** The reply parameters. */
+               private final SimpleFieldSet replyParameters;
+
+               /** The reply data, may be {@code null}. */
+               private final byte[] data;
+
+               /** The data bucket, may be {@code null}. */
+               private final Bucket bucket;
+
+               /**
+                * Creates a new reply with the given parameters.
+                *
+                * @param replyParameters
+                *            The reply parameters
+                */
+               public Reply(SimpleFieldSet replyParameters) {
+                       this(replyParameters, null, null);
+               }
+
+               /**
+                * Creates a new reply with the given parameters.
+                *
+                * @param replyParameters
+                *            The reply parameters
+                * @param data
+                *            The data of the reply (may be {@code null})
+                */
+               public Reply(SimpleFieldSet replyParameters, byte[] data) {
+                       this(replyParameters, data, null);
+               }
+
+               /**
+                * Creates a new reply with the given parameters.
+                *
+                * @param replyParameters
+                *            The reply parameters
+                * @param bucket
+                *            The bucket of the reply (may be {@code null})
+                */
+               public Reply(SimpleFieldSet replyParameters, Bucket bucket) {
+                       this(replyParameters, null, bucket);
+               }
+
+               /**
+                * Creates a new reply with the given parameters.
+                *
+                * @param replyParameters
+                *            The reply parameters
+                * @param data
+                *            The data of the reply (may be {@code null})
+                * @param bucket
+                *            The bucket of the reply (may be {@code null})
+                */
+               private Reply(SimpleFieldSet replyParameters, byte[] data, Bucket bucket) {
+                       this.replyParameters = replyParameters;
+                       this.data = data;
+                       this.bucket = bucket;
+               }
+
+               /**
+                * Returns the reply parameters.
+                *
+                * @return The reply parameters
+                */
+               public SimpleFieldSet getReplyParameters() {
+                       return replyParameters;
+               }
+
+               /**
+                * Returns whether the reply has reply data.
+                *
+                * @see #getData()
+                * @return {@code true} if this reply has data, {@code false} otherwise
+                */
+               public boolean hasData() {
+                       return data != null;
+               }
+
+               /**
+                * Returns the data of the reply.
+                *
+                * @return The data of the reply
+                */
+               public byte[] getData() {
+                       return data;
+               }
+
+               /**
+                * Returns whether the reply has a data bucket.
+                *
+                * @see #getBucket()
+                * @return {@code true} if the reply has a data bucket, {@code false}
+                *         otherwise
+                */
+               public boolean hasBucket() {
+                       return bucket != null;
+               }
+
+               /**
+                * Returns the data bucket of the reply.
+                *
+                * @return The data bucket of the reply
+                */
+               public Bucket getBucket() {
+                       return bucket;
+               }
+
+       }
+
+}