/*
 * Copyright (C) 2009, Christian Halstrick <christian.halstrick@sap.com>
 * Copyright (C) 2009, Google Inc.
 * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
 * Copyright (C) 2006-2008, 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.lib;

import static java.util.zip.Deflater.DEFAULT_COMPRESSION;
import static org.eclipse.jgit.lib.ObjectLoader.STREAM_THRESHOLD;

import org.eclipse.jgit.lib.Config.SectionParser;

/**
 * This class keeps git repository core parameters.
 */
public class CoreConfig {
	/** Key for {@link Config#get(SectionParser)}. */
	public static final Config.SectionParser<CoreConfig> KEY = new SectionParser<CoreConfig>() {
		public CoreConfig parse(final Config cfg) {
			return new CoreConfig(cfg);
		}
	};

	private final int compression;

	private final int packIndexVersion;

	private final boolean logAllRefUpdates;

	private final int streamFileThreshold;

	private CoreConfig(final Config rc) {
		compression = rc.getInt("core", "compression", DEFAULT_COMPRESSION);
		packIndexVersion = rc.getInt("pack", "indexversion", 2);
		logAllRefUpdates = rc.getBoolean("core", "logallrefupdates", true);

		long maxMem = Runtime.getRuntime().maxMemory();
		long sft = rc.getLong("core", null, "streamfilethreshold", STREAM_THRESHOLD);
		sft = Math.min(sft, maxMem / 4); // don't use more than 1/4 of the heap
		sft = Math.min(sft, Integer.MAX_VALUE); // cannot exceed array length
		streamFileThreshold = (int) sft;
	}

	/**
	 * @return The compression level to use when storing loose objects
	 */
	public int getCompression() {
		return compression;
	}

	/**
	 * @return the preferred pack index file format; 0 for oldest possible.
	 * @see org.eclipse.jgit.transport.IndexPack
	 */
	public int getPackIndexVersion() {
		return packIndexVersion;
	}

	/**
	 * @return whether to log all refUpdates
	 */
	public boolean isLogAllRefUpdates() {
		return logAllRefUpdates;
	}

	/** @return the size threshold beyond which objects must be streamed. */
	public int getStreamFileThreshold() {
		return streamFileThreshold;
	}
}
