001/*
002 * Copyright 2012-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.boot.cli;
018
019import java.io.File;
020import java.net.MalformedURLException;
021import java.net.URL;
022import java.net.URLClassLoader;
023import java.util.ArrayList;
024import java.util.List;
025import java.util.ServiceLoader;
026
027import org.springframework.boot.cli.command.CommandFactory;
028import org.springframework.boot.cli.command.CommandRunner;
029import org.springframework.boot.cli.command.core.HelpCommand;
030import org.springframework.boot.cli.command.core.HintCommand;
031import org.springframework.boot.cli.command.core.VersionCommand;
032import org.springframework.boot.cli.command.shell.ShellCommand;
033import org.springframework.boot.loader.tools.LogbackInitializer;
034import org.springframework.util.ClassUtils;
035import org.springframework.util.SystemPropertyUtils;
036
037/**
038 * Spring Command Line Interface. This is the main entry-point for the Spring command line
039 * application.
040 *
041 * @author Phillip Webb
042 * @see #main(String...)
043 * @see CommandRunner
044 */
045public final class SpringCli {
046
047        private SpringCli() {
048        }
049
050        public static void main(String... args) {
051                System.setProperty("java.awt.headless", Boolean.toString(true));
052                LogbackInitializer.initialize();
053
054                CommandRunner runner = new CommandRunner("spring");
055                ClassUtils.overrideThreadContextClassLoader(createExtendedClassLoader(runner));
056                runner.addCommand(new HelpCommand(runner));
057                addServiceLoaderCommands(runner);
058                runner.addCommand(new ShellCommand());
059                runner.addCommand(new HintCommand(runner));
060                runner.setOptionCommands(HelpCommand.class, VersionCommand.class);
061                runner.setHiddenCommands(HintCommand.class);
062
063                int exitCode = runner.runAndHandleErrors(args);
064                if (exitCode != 0) {
065                        // If successful, leave it to run in case it's a server app
066                        System.exit(exitCode);
067                }
068        }
069
070        private static void addServiceLoaderCommands(CommandRunner runner) {
071                ServiceLoader<CommandFactory> factories = ServiceLoader
072                                .load(CommandFactory.class);
073                for (CommandFactory factory : factories) {
074                        runner.addCommands(factory.getCommands());
075                }
076        }
077
078        private static URLClassLoader createExtendedClassLoader(CommandRunner runner) {
079                return new URLClassLoader(getExtensionURLs(), runner.getClass().getClassLoader());
080        }
081
082        private static URL[] getExtensionURLs() {
083                List<URL> urls = new ArrayList<>();
084                String home = SystemPropertyUtils
085                                .resolvePlaceholders("${spring.home:${SPRING_HOME:.}}");
086                File extDirectory = new File(new File(home, "lib"), "ext");
087                if (extDirectory.isDirectory()) {
088                        for (File file : extDirectory.listFiles()) {
089                                if (file.getName().endsWith(".jar")) {
090                                        try {
091                                                urls.add(file.toURI().toURL());
092                                        }
093                                        catch (MalformedURLException ex) {
094                                                throw new IllegalStateException(ex);
095                                        }
096                                }
097                        }
098                }
099                return urls.toArray(new URL[0]);
100        }
101
102}