CheckoutCommand: Add method to add multiple paths

The new method addPaths(List<String>) allows callers to add multiple
paths without having to iterate over several calls to addPath(String).

Change-Id: I2c3746a97ead7118fb0ed5543a2c843224719031
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Checkout.java

@@ -95,9 +95,7 @@ class Checkout extends TextBuiltin {
 				if (paths.size() == 1 && paths.get(0).equals(".")) { //$NON-NLS-1$
 					command.setAllPaths(true);
 				} else {
-					for (String path : paths) {
+					command.addPaths(paths);
-						command.addPath(path);
-					}
 				}
 			} else {
 				command.setCreateBranch(createBranch);

org.eclipse.jgit/src/org/eclipse/jgit/api/CheckoutCommand.java

@@ -366,6 +366,26 @@ public class CheckoutCommand extends GitCommand<Ref> {
 		return this;
 	}
 
+	/**
+	 * Add multiple slash-separated paths to the list of paths to check out. To
+	 * check out all paths, use {@link #setAllPaths(boolean)}.
+	 * <p>
+	 * If this option is set, neither the {@link #setCreateBranch(boolean)} nor
+	 * {@link #setName(String)} option is considered. In other words, these
+	 * options are exclusive.
+	 *
+	 * @param p
+	 *            paths to update in the working tree and index (with
+	 *            <code>/</code> as separator)
+	 * @return {@code this}
+	 * @since 4.6
+	 */
+	public CheckoutCommand addPaths(List<String> p) {
+		checkCallable();
+		this.paths.addAll(p);
+		return this;
+	}
+
 	/**
 	 * Set whether to checkout all paths.
 	 * <p>