| /* |
| * Copyright (C) 2016, Matthias Sohn <matthias.sohn@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.attributes; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.eclipse.jgit.lib.Repository; |
| |
| /** |
| * Registry for built-in filters |
| * |
| * @since 4.6 |
| */ |
| public class FilterCommandRegistry { |
| private static ConcurrentHashMap<String, FilterCommandFactory> filterCommandRegistry = new ConcurrentHashMap<>(); |
| |
| /** |
| * Register a {@link org.eclipse.jgit.attributes.FilterCommandFactory} |
| * responsible for creating |
| * {@link org.eclipse.jgit.attributes.FilterCommand}s for a certain command |
| * name. If the factory f1 is registered for the name "jgit://builtin/x" |
| * then a call to <code>getCommand("jgit://builtin/x", ...)</code> will call |
| * <code>f1(...)</code> to create a new instance of |
| * {@link org.eclipse.jgit.attributes.FilterCommand} |
| * |
| * @param filterCommandName |
| * the command name for which this factory is registered |
| * @param factory |
| * the factory responsible for creating |
| * {@link org.eclipse.jgit.attributes.FilterCommand}s for the |
| * specified name |
| * @return the previous factory associated with <tt>commandName</tt>, or |
| * <tt>null</tt> if there was no mapping for <tt>commandName</tt> |
| */ |
| public static FilterCommandFactory register(String filterCommandName, |
| FilterCommandFactory factory) { |
| return filterCommandRegistry.put(filterCommandName, factory); |
| } |
| |
| /** |
| * Unregister the {@link org.eclipse.jgit.attributes.FilterCommandFactory} |
| * registered for the given command name |
| * |
| * @param filterCommandName |
| * the FilterCommandFactory's filter command name |
| * @return the previous factory associated with <tt>filterCommandName</tt>, |
| * or <tt>null</tt> if there was no mapping for <tt>commandName</tt> |
| */ |
| public static FilterCommandFactory unregister(String filterCommandName) { |
| return filterCommandRegistry.remove(filterCommandName); |
| } |
| |
| /** |
| * Check whether any |
| * {@link org.eclipse.jgit.attributes.FilterCommandFactory} is registered |
| * for a given command name |
| * |
| * @param filterCommandName |
| * the name for which the registry should be checked |
| * @return <code>true</code> if any factory was registered for the name |
| */ |
| public static boolean isRegistered(String filterCommandName) { |
| return filterCommandRegistry.containsKey(filterCommandName); |
| } |
| |
| /** |
| * Get registered filter commands |
| * |
| * @return Set of commandNames for which a |
| * {@link org.eclipse.jgit.attributes.FilterCommandFactory} is |
| * registered |
| */ |
| public static Set<String> getRegisteredFilterCommands() { |
| return filterCommandRegistry.keySet(); |
| } |
| |
| /** |
| * Create a new {@link org.eclipse.jgit.attributes.FilterCommand} for the |
| * given name. A factory must be registered for the name in advance. |
| * |
| * @param filterCommandName |
| * The name for which a new |
| * {@link org.eclipse.jgit.attributes.FilterCommand} should be |
| * created |
| * @param db |
| * the repository this command should work on |
| * @param in |
| * the {@link java.io.InputStream} this |
| * {@link org.eclipse.jgit.attributes.FilterCommand} should read |
| * from |
| * @param out |
| * the {@link java.io.OutputStream} this |
| * {@link org.eclipse.jgit.attributes.FilterCommand} should write |
| * to |
| * @return the command if a command could be created or <code>null</code> if |
| * there was no factory registered for that name |
| * @throws java.io.IOException |
| */ |
| public static FilterCommand createFilterCommand(String filterCommandName, |
| Repository db, InputStream in, OutputStream out) |
| throws IOException { |
| FilterCommandFactory cf = filterCommandRegistry.get(filterCommandName); |
| return (cf == null) ? null : cf.create(db, in, out); |
| } |
| |
| } |