| /* |
| * Copyright (C) 2013, Google Inc. |
| * 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.internal.storage.pack; |
| |
| /** A pack file extension. */ |
| public class PackExt { |
| private static volatile PackExt[] VALUES = new PackExt[] {}; |
| |
| /** A pack file extension. */ |
| public static final PackExt PACK = newPackExt("pack"); //$NON-NLS-1$ |
| |
| /** A pack index file extension. */ |
| public static final PackExt INDEX = newPackExt("idx"); //$NON-NLS-1$ |
| |
| /** A keep pack file extension. */ |
| public static final PackExt KEEP = newPackExt("keep"); //$NON-NLS-1$ |
| |
| /** A pack bitmap index file extension. */ |
| public static final PackExt BITMAP_INDEX = newPackExt("bitmap"); //$NON-NLS-1$ |
| |
| /** A reftable file. */ |
| public static final PackExt REFTABLE = newPackExt("ref"); //$NON-NLS-1$ |
| |
| /** @return all of the PackExt values. */ |
| public static PackExt[] values() { |
| return VALUES; |
| } |
| |
| /** |
| * Returns a PackExt for the file extension and registers it in the values |
| * array. |
| * |
| * @param ext |
| * the file extension. |
| * @return the PackExt for the ext |
| */ |
| public synchronized static PackExt newPackExt(String ext) { |
| PackExt[] dst = new PackExt[VALUES.length + 1]; |
| for (int i = 0; i < VALUES.length; i++) { |
| PackExt packExt = VALUES[i]; |
| if (packExt.getExtension().equals(ext)) |
| return packExt; |
| dst[i] = packExt; |
| } |
| if (VALUES.length >= 32) |
| throw new IllegalStateException( |
| "maximum number of pack extensions exceeded"); //$NON-NLS-1$ |
| |
| PackExt value = new PackExt(ext, VALUES.length); |
| dst[VALUES.length] = value; |
| VALUES = dst; |
| return value; |
| } |
| |
| private final String ext; |
| |
| private final int pos; |
| |
| private PackExt(String ext, int pos) { |
| this.ext = ext; |
| this.pos = pos; |
| } |
| |
| /** @return the file extension. */ |
| public String getExtension() { |
| return ext; |
| } |
| |
| /** @return the position of the extension in the values array. */ |
| public int getPosition() { |
| return pos; |
| } |
| |
| /** @return the bit mask of the extension e.g {@code 1 << getPosition()}. */ |
| public int getBit() { |
| return 1 << getPosition(); |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("PackExt[%s, bit=0x%s]", getExtension(), //$NON-NLS-1$ |
| Integer.toHexString(getBit())); |
| } |
| } |