/*
 * Copyright (C) 2010, Jens Baumgart <jens.baumgart@sap.com> 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.filter;

import java.io.IOException;

import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.treewalk.TreeWalk;
import org.eclipse.jgit.treewalk.WorkingTreeIterator;

/**
 * Skip {@link org.eclipse.jgit.treewalk.WorkingTreeIterator} entries that
 * appear in gitignore files.
 */
public class NotIgnoredFilter extends TreeFilter {
	private final int index;

	/**
	 * Construct a filter to ignore paths known to a particular iterator.
	 *
	 * @param workdirTreeIndex
	 *            index of the workdir tree in the tree walk
	 */
	public NotIgnoredFilter(int workdirTreeIndex) {
		this.index = workdirTreeIndex;
	}

	/** {@inheritDoc} */
	@Override
	public boolean include(TreeWalk tw) throws MissingObjectException,
			IncorrectObjectTypeException, IOException {
		WorkingTreeIterator i = tw.getTree(index, WorkingTreeIterator.class);
		return i == null || !i.isEntryIgnored();
	}

	/** {@inheritDoc} */
	@Override
	public boolean shouldBeRecursive() {
		return false;
	}

	/** {@inheritDoc} */
	@Override
	public TreeFilter clone() {
		// immutable
		return this;
	}

	/** {@inheritDoc} */
	@SuppressWarnings("nls")
	@Override
	public String toString() {
		return "NotIgnored(" + index + ")";
	}
}