add reverse

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/src/algorithms/arrays/Reverse.java b/src/algorithms/arrays/Reverse.java
new file mode 100644
index 0000000..df24716
--- /dev/null
+++ b/src/algorithms/arrays/Reverse.java
@@ -0,0 +1,78 @@
+/**
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package algorithms.arrays;
+
+import java.util.*;
+
+
+/**
+ * Class for reversing arrays
+ */
+public class Reverse
+{
+£>for T in boolean char byte short int long; do
+    /**
+     * Reverses an array
+     *
+     * @param  items  The array to reverse
+     */
+    public static void reverse(£{T}[] items)
+    {
+        for (int i = 0, j = items.length - 1; i < j; i++, j--)
+	{
+	    items[j] ^= items[i];
+	    items[i] ^= items[j];
+	    items[j] ^= items[i];
+	}
+    }
+£>done
+
+£>for T in float double Object; do
+    /**
+     * Reverses an array
+     *
+     * @param  items  The array to reverse
+     */
+    public static void reverse(£{T}[] items)
+    {
+        £{T} temp;
+        for (int i = 0, j = items.length - 1; i < j; i++, j--)
+	{
+	    temp = items[i];
+	    items[i] = items[j];
+	    items[j] = temp;
+	}
+    }
+£>done
+
+£>for T in boolean char byte short int long float double Object; do
+    /**
+     * Make a clone of an array, but make it reversed
+     *
+     * @param   items  The array to reverse
+     * @return         The array reversed
+     */
+    public static £{T}[] reverseClone(£{T}[] items)
+    {
+        £{T}[] rc = new £{T}[items.length];
+        for (int i = 0, n = items.length - 1; i <= n; i++)
+            rc[i] = items[n - i];
+        return rc;
+    }
+£>done
+}
+