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hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/cli/ExtensibleParentCommand.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.apache.hadoop.hdds.cli; | ||
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|
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| import picocli.CommandLine; | ||
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| import java.util.ServiceLoader; | ||
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| /** | ||
| * Interface for parent commands that accept subcommands to be dynamically registered. | ||
| * Subcommands should: | ||
| * <li>implement the interface returned by {@link #subcommandType()}</li> | ||
| * <li>be annotated with {@code MetaInfServices} parameterized with the same type</li> | ||
| */ | ||
| public interface ExtensibleParentCommand { | ||
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| /** @return The class of the marker interface for subcommands. */ | ||
| Class<?> subcommandType(); | ||
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| /** Recursively find and add subcommands to {@code cli}. */ | ||
| static void addSubcommands(CommandLine cli) { | ||
| Object command = cli.getCommand(); | ||
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| // find and add subcommands | ||
| if (command instanceof ExtensibleParentCommand) { | ||
| ExtensibleParentCommand parentCommand = (ExtensibleParentCommand) command; | ||
| ServiceLoader<?> subcommands = ServiceLoader.load(parentCommand.subcommandType()); | ||
| for (Object subcommand : subcommands) { | ||
| final CommandLine.Command commandAnnotation = subcommand.getClass().getAnnotation(CommandLine.Command.class); | ||
| CommandLine subcommandCommandLine = new CommandLine(subcommand, cli.getFactory()); | ||
| cli.addSubcommand(commandAnnotation.name(), subcommandCommandLine); | ||
| } | ||
| } | ||
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| // process subcommands recursively | ||
| for (CommandLine subcommand : cli.getSubcommands().values()) { | ||
| addSubcommands(subcommand); | ||
| } | ||
| } | ||
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| } |
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