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/*
* 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 other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
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(final 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;
}
@Override
public AbstractTreeIterator createSubtreeIterator(final ObjectReader reader)
throws IncorrectObjectTypeException, IOException {
return new EmptyTreeIterator(this);
}
@Override
public boolean hasId() {
return false;
}
@Override
public ObjectId getEntryObjectId() {
return ObjectId.zeroId();
}
@Override
public byte[] idBuffer() {
return zeroid;
}
@Override
public int idOffset() {
return 0;
}
@Override
public void reset() {
// Do nothing.
}
@Override
public boolean first() {
return true;
}
@Override
public boolean eof() {
return true;
}
@Override
public void next(final int delta) throws CorruptObjectException {
// Do nothing.
}
@Override
public void back(final int delta) throws CorruptObjectException {
// Do nothing.
}
@Override
public void stopWalk() {
if (parent != null)
parent.stopWalk();
}
@Override
protected boolean needsStopWalk() {
return parent != null && parent.needsStopWalk();
}
}
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