Allow client of Add command to set a WorkingTreeIterator

This is e.g. useful when a client of the AddCommand has
additional rules to ignore files. In Eclipse a resource can
be set to derived or be excluded by preferences.

Change-Id: I6c47e54a1ce26315faf5ed0723298ad2c2db197c
Signed-off-by: Stefan Lay <stefan.lay@sap.com>

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

@@ -58,6 +58,7 @@ import org.eclipse.jgit.lib.ObjectWriter;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.treewalk.FileTreeIterator;
 import org.eclipse.jgit.treewalk.TreeWalk;
+import org.eclipse.jgit.treewalk.WorkingTreeIterator;
 import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
 
 /**
@@ -73,6 +74,8 @@ public class AddCommand extends GitCommand<DirCache> {
 
 	private Collection<String> filepatterns;
 
+	private WorkingTreeIterator workingTreeIterator;
+
 	/**
 	 *
 	 * @param repo
@@ -96,6 +99,16 @@ public class AddCommand extends GitCommand<DirCache> {
 		return this;
 	}
 
+	/**
+	 * Allow clients to provide their own implementation of a FileTreeIterator
+	 * @param f
+	 * @return {@code this}
+	 */
+	public AddCommand setWorkingTreeIterator(WorkingTreeIterator f) {
+		workingTreeIterator = f;
+		return this;
+	}
+
 	/**
 	 * Executes the {@code Add} command. Each instance of this class should only
 	 * be used for one invocation of the command. Don't call this method twice
@@ -122,8 +135,9 @@ public class AddCommand extends GitCommand<DirCache> {
 			final TreeWalk tw = new TreeWalk(repo);
 			tw.reset();
 			tw.addTree(new DirCacheBuildIterator(builder));
-			FileTreeIterator fileTreeIterator = new FileTreeIterator(repo);
+			if (workingTreeIterator == null)
-			tw.addTree(fileTreeIterator);
+				workingTreeIterator = new FileTreeIterator(repo);
+			tw.addTree(workingTreeIterator);
 			tw.setRecursive(true);
 			if (!addAll)
 				tw.setFilter(PathFilterGroup.createFromStrings(filepatterns));
@@ -134,7 +148,7 @@ public class AddCommand extends GitCommand<DirCache> {
 				String path = tw.getPathString();
 
 				final File file = new File(repo.getWorkDir(), path);
-				FileTreeIterator f = tw.getTree(1, FileTreeIterator.class);
+				WorkingTreeIterator f = tw.getTree(1, WorkingTreeIterator.class);
 				if (tw.getTree(0, DirCacheIterator.class) == null &&
 						f != null && f.isEntryIgnored()) {
 					// file is not in index but is ignored, do nothing