/*
 * Copyright (C) 2008, Florian Koeberle <florianskarten@web.de>
 * Copyright (C) 2008, Florian Köberle <florianskarten@web.de>
 * 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.fnmatch;

import java.util.List;

import org.eclipse.jgit.internal.JGitText;

abstract class AbstractHead implements Head {
	private List<Head> newHeads = null;

	private final boolean star;

	/**
	 * Whether the char matches
	 *
	 * @param c
	 *            a char.
	 * @return whether the char matches
	 */
	protected abstract boolean matches(char c);

	AbstractHead(boolean star) {
		this.star = star;
	}

	/**
	 * Set {@link org.eclipse.jgit.fnmatch.Head}s which will not be modified.
	 *
	 * @param newHeads
	 *            a list of {@link org.eclipse.jgit.fnmatch.Head}s which will
	 *            not be modified.
	 */
	public final void setNewHeads(List<Head> newHeads) {
		if (this.newHeads != null)
			throw new IllegalStateException(JGitText.get().propertyIsAlreadyNonNull);
		this.newHeads = newHeads;
	}

	/** {@inheritDoc} */
	@Override
	public List<Head> getNextHeads(char c) {
		if (matches(c)) {
			return newHeads;
		}
		return FileNameMatcher.EMPTY_HEAD_LIST;
	}

	boolean isStar() {
		return star;
	}
}