| /* |
| * Copyright (C) 2008-2009, Google Inc. |
| * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com> |
| * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.treewalk; |
| |
| import java.io.IOException; |
| |
| import org.eclipse.jgit.errors.CorruptObjectException; |
| import org.eclipse.jgit.errors.IncorrectObjectTypeException; |
| import org.eclipse.jgit.lib.ObjectId; |
| import org.eclipse.jgit.lib.ObjectReader; |
| |
| /** |
| * Iterator over an empty tree (a directory with no files). |
| */ |
| public class EmptyTreeIterator extends AbstractTreeIterator { |
| /** |
| * Create a new iterator with no parent. |
| */ |
| public EmptyTreeIterator() { |
| // Create a root empty tree. |
| } |
| |
| EmptyTreeIterator(AbstractTreeIterator p) { |
| super(p); |
| pathLen = pathOffset; |
| } |
| |
| /** |
| * Create an iterator for a subtree of an existing iterator. |
| * <p> |
| * The caller is responsible for setting up the path of the child iterator. |
| * |
| * @param p |
| * parent tree iterator. |
| * @param childPath |
| * path array to be used by the child iterator. This path must |
| * contain the path from the top of the walk to the first child |
| * and must end with a '/'. |
| * @param childPathOffset |
| * position within <code>childPath</code> where the child can |
| * insert its data. The value at |
| * <code>childPath[childPathOffset-1]</code> must be '/'. |
| */ |
| public EmptyTreeIterator(final AbstractTreeIterator p, |
| final byte[] childPath, final int childPathOffset) { |
| super(p, childPath, childPathOffset); |
| pathLen = childPathOffset - 1; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public AbstractTreeIterator createSubtreeIterator(ObjectReader reader) |
| throws IncorrectObjectTypeException, IOException { |
| return new EmptyTreeIterator(this); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean hasId() { |
| return false; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public ObjectId getEntryObjectId() { |
| return ObjectId.zeroId(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public byte[] idBuffer() { |
| return zeroid; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int idOffset() { |
| return 0; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void reset() { |
| // Do nothing. |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean first() { |
| return true; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean eof() { |
| return true; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void next(int delta) throws CorruptObjectException { |
| // Do nothing. |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void back(int delta) throws CorruptObjectException { |
| // Do nothing. |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void stopWalk() { |
| if (parent != null) |
| parent.stopWalk(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected boolean needsStopWalk() { |
| return parent != null && parent.needsStopWalk(); |
| } |
| } |