Added support for restoring from backups (snapshots). Added /listsnapshots, //use, and //restore.

src/com/sk89q/worldedit/snapshots/InvalidSnapshotException.java

@@ -0,0 +1,28 @@
+// $Id$
+/*
+ * WorldEdit
+ * Copyright (C) 2010 sk89q <http://www.sk89q.com>
+ *
+ * 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 com.sk89q.worldedit.snapshots;
+
+/**
+ *
+ * @author sk89q
+ */
+public class InvalidSnapshotException extends Exception {
+
+}

src/com/sk89q/worldedit/snapshots/Snapshot.java

@@ -0,0 +1,73 @@
+// $Id$
+/*
+ * WorldEdit
+ * Copyright (C) 2010 sk89q <http://www.sk89q.com>
+ *
+ * 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 com.sk89q.worldedit.snapshots;
+
+import com.sk89q.worldedit.data.*;
+import java.io.*;
+
+/**
+ *
+ * @author sk89q
+ */
+public class Snapshot {
+    /**
+     * Stores snapshot file.
+     */
+    private File file;
+    /**
+     * Name of the snapshot;
+     */
+    private String name;
+
+    /**
+     * Construct a snapshot restoration operation.
+     * 
+     * @param editSession
+     * @param dir
+     * @param snapshot
+     */
+    public Snapshot(SnapshotRepository repo, String snapshot) {
+        file = new File(repo.getDirectory(), snapshot);
+        name = snapshot;
+    }
+
+    /**
+     * Get a chunk store.
+     * 
+     * @return
+     * @throws IOException
+     */
+    public ChunkStore getChunkStore() throws IOException {
+        if (file.getName().toLowerCase().endsWith(".zip")) {
+            return new ZippedAlphaChunkStore(file);
+        } else {
+            return new AlphaChunkStore(file);
+        }
+    }
+
+    /**
+     * Get the snapshot's name.
+     * 
+     * @return
+     */
+    public String getName() {
+        return name;
+    }
+}

src/com/sk89q/worldedit/snapshots/SnapshotRepository.java

@@ -0,0 +1,144 @@
+// $Id$
+/*
+ * WorldEdit
+ * Copyright (C) 2010 sk89q <http://www.sk89q.com>
+ *
+ * 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 com.sk89q.worldedit.snapshots;
+
+import java.io.*;
+import java.util.Arrays;
+import java.util.Collections;
+
+/**
+ *
+ * @author sk89q
+ */
+public class SnapshotRepository {
+    /**
+     * Stores the directory the snapshots come from.
+     */
+    private File dir;
+
+    /**
+     * Create a new instance of a repository.
+     *
+     * @param dir
+     */
+    public SnapshotRepository(File dir) {
+        this.dir = dir;
+    }
+
+    /**
+     * Create a new instance of a repository.
+     *
+     * @param dir
+     */
+    public SnapshotRepository(String dir) {
+        this.dir = new File(dir);
+    }
+
+    /**
+     * Get a list of snapshots in a directory. The newest snapshot is
+     * near the top of the array.
+     *
+     * @return
+     */
+    public Snapshot[] getSnapshots() {
+        FilenameFilter filter = new FilenameFilter() {
+            public boolean accept(File dir, String name) {
+                File f = new File(dir, name);
+                return (name.toLowerCase().endsWith(".zip")
+                        && f.isFile())
+                        || f.isDirectory();
+            }
+        };
+
+        String[] snapshotNames = dir.list(filter);
+
+        if (snapshotNames == null || snapshotNames.length == 0) {
+            return new Snapshot[0];
+        }
+        
+        Snapshot[] snapshots = new Snapshot[snapshotNames.length];
+
+        Arrays.sort(snapshotNames, Collections.reverseOrder());
+
+        int i = 0;
+        for (String name : snapshotNames) {
+            snapshots[i] = new Snapshot(this, name);
+            i++;
+        }
+
+        return snapshots;
+    }
+
+    /**
+     * Get the default snapshot.
+     *
+     * @return
+     */
+    public Snapshot getDefaultSnapshot() {
+        Snapshot[] snapshots = getSnapshots();
+
+        if (snapshots.length == 0) {
+            return null;
+        }
+
+        return snapshots[0];
+    }
+
+    /**
+     * Check to see if a snapshot is valid.
+     *
+     * @param dir
+     * @param snapshot
+     * @return whether it is a valid snapshot
+     */
+    public boolean isValidSnapshotName(String snapshot) {
+        if (!snapshot.matches("[A-Za-z0-9_\\-,.\\[\\]\\(\\) ]{1,50}")) {
+            return false;
+        }
+
+        File f = new File(dir, snapshot);
+        return (f.isDirectory() && (new File(f, "level.dat")).exists())
+                || (f.isFile() && f.getName().toLowerCase().endsWith((".zip")));
+    }
+
+    /**
+     * Get a snapshot.
+     * 
+     * @param name
+     * @return
+     * @throws InvalidSnapshotException
+     */
+    public Snapshot getSnapshot(String name) throws InvalidSnapshotException {
+        if (!isValidSnapshotName(name)) {
+            throw new InvalidSnapshotException();
+        }
+
+        return new Snapshot(this, name);
+    }
+
+    /**
+     * Get the snapshot directory.
+     *
+     * @return
+     */
+    public File getDirectory() {
+        return dir;
+    }
+}