added another file tool class to yacy-cora

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@7932 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/net/yacy/cora/storage/Files.java

@@ -0,0 +1,71 @@
+/**
+ *  ConfigurationSet
+ *  Copyright 2011 by Michael Peter Christen, mc@yacy.net, Frankfurt a. M., Germany
+ *  First released 29.06.2011 at http://yacy.net
+ *
+ *  $LastChangedDate: 2011-05-30 10:53:58 +0200 (Mo, 30 Mai 2011) $
+ *  $LastChangedRevision: 7759 $
+ *  $LastChangedBy: orbiter $
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program in the file lgpl21.txt
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.yacy.cora.storage;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class Files {
+
+    /**
+     * copy a file or a complete directory
+     * @param from the source file or directory
+     * @param to the destination file or directory
+     * @throws IOException
+     */
+    public static void copy(final File from, final File to) throws IOException {
+        if (!from.exists()) {
+            throw new IOException("Can not find source: " + from.getAbsolutePath()+".");
+        } else if (!from.canRead()) {
+            throw new IOException("No right to source: " + from.getAbsolutePath()+".");
+        }
+        if (from.isDirectory())  {
+            if (!to.exists() && !to.mkdirs()) {
+                throw new IOException("Could not create directory: " + to.getAbsolutePath() + ".");
+            }
+            for (final String f : from.list()) {
+                copy(new File(from, f) , new File(to, f));
+            }
+        } else {
+            if (to.isDirectory()) throw new IOException("Cannot copy a file to an existing directory");
+            if (to.exists()) to.delete();
+            final byte[] buffer = new byte[4096];
+            int bytesRead;
+            final InputStream in =  new BufferedInputStream(new FileInputStream(from));
+            final OutputStream out = new BufferedOutputStream(new FileOutputStream (to));
+            while ((bytesRead = in.read(buffer)) >= 0) {
+                out.write(buffer,0,bytesRead);
+            }
+            in.close();
+            out.close();
+        }
+    }
+}