Support Get And Touch (GATS) for ASCII Protocol

src/main/java/net/spy/memcached/protocol/ascii/AsciiOperationFactory.java

@@ -81,10 +81,12 @@ public FlushOperation flush(int delay, OperationCallback cb) {
     return new FlushOperationImpl(delay, cb);
   }
 
+  /**
+   * Get And Touch is only supported in memcached 1.5.3 and later.
+   */
   public GetAndTouchOperation getAndTouch(String key, int expiration,
       GetAndTouchOperation.Callback cb) {
-    throw new UnsupportedOperationException("Get and touch is not supported "
-        + "for ASCII protocol");
+    return new GetAndTouchOperationImpl(key, expiration, cb);
   }
 
   public GetOperation get(String key, GetOperation.Callback cb) {

src/main/java/net/spy/memcached/protocol/ascii/BaseGetOpImpl.java

@@ -203,11 +203,20 @@ public final void initialize() {
     size += afterKeyBytesSize();
     ByteBuffer b = ByteBuffer.allocate(size);
     b.put(cmd.getBytes());
-    for (byte[] k : keyBytes) {
-      b.put((byte) ' ');
-      b.put(k);
+    if (cmd.equals("gats")) {
+      afterKeyBytes(b);
+      for (byte[] k : keyBytes) {
+        b.put((byte) ' ');
+        b.put(k);
+      }
+    }
+    else {
+      for (byte[] k : keyBytes) {
+        b.put((byte) ' ');
+        b.put(k);
+      }
+      afterKeyBytes(b);
     }
-    afterKeyBytes(b);
     b.put(RN_BYTES);
     b.flip();
     setBuffer(b);

src/main/java/net/spy/memcached/protocol/ascii/GetAndTouchOperationImpl.java

@@ -30,11 +30,22 @@
 public class GetAndTouchOperationImpl extends BaseGetOpImpl implements
     GetAndTouchOperation {
 
+  private static final String CMD = "gats";
+
+  /**
+   * @deprecated use {@link #GetAndTouchOperationImpl(String, int,
+   *   net.spy.memcached.ops.GetAndTouchOperation.Callback)}
+   */
   public GetAndTouchOperationImpl(String c, int e,
       GetAndTouchOperation.Callback cb, String k) {
     super(c, e, cb, k);
   }
 
+  public GetAndTouchOperationImpl(String k, int e,
+      GetAndTouchOperation.Callback cb) {
+    super(CMD, e, cb, k);
+  }
+
   @Override
   public int getExpiration() {
     return exp;

src/test/java/net/spy/memcached/protocol/ascii/AsciiToStringTest.java

@@ -46,7 +46,7 @@ public void testFlush() {
   }
 
   public void testGetAndTouch() {
-    (new GetAndTouchOperationImpl("gat", 15, null, "key")).toString();
+    (new GetAndTouchOperationImpl("key", 15, null)).toString();
   }
 
   public void testTouch() {