| /* |
| * Copyright (C) 2013, Google Inc. 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.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"); //$NON-NLS-1$ |
| |
| /** |
| * Get all of the PackExt values. |
| * |
| * @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 static synchronized 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; |
| } |
| |
| /** |
| * Get the file extension. |
| * |
| * @return the file extension. |
| */ |
| public String getExtension() { |
| return ext; |
| } |
| |
| /** |
| * Get the position of the extension in the values array. |
| * |
| * @return the position of the extension in the values array. |
| */ |
| public int getPosition() { |
| return pos; |
| } |
| |
| /** |
| * Get the bit mask of the extension e.g {@code 1 << getPosition()}. |
| * |
| * @return the bit mask of the extension e.g {@code 1 << getPosition()}. |
| */ |
| public int getBit() { |
| return 1 << getPosition(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public String toString() { |
| return String.format("PackExt[%s, bit=0x%s]", getExtension(), //$NON-NLS-1$ |
| Integer.toHexString(getBit())); |
| } |
| } |