| /** |
| * 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.metron.common.utils.cli; |
| |
| import com.google.common.base.Function; |
| import com.google.common.base.Joiner; |
| import org.apache.commons.cli.*; |
| |
| import java.util.EnumMap; |
| import java.util.Optional; |
| |
| public abstract class OptionHandler<OPT_T extends Enum<OPT_T> & CLIOptions<OPT_T>> implements Function<String, Option> |
| { |
| public Optional<Object> getValue(OPT_T option, CommandLine cli) { |
| return Optional.empty(); |
| } |
| |
| public abstract String getShortCode(); |
| |
| public static Options getOptions(CLIOptions[] values) { |
| Options ret = new Options(); |
| for(CLIOptions o : values) { |
| ret.addOption(o.getOption()); |
| } |
| return ret; |
| } |
| |
| public static void printHelp(String name, CLIOptions[] values) { |
| HelpFormatter formatter = new HelpFormatter(); |
| formatter.printHelp( name, getOptions(values)); |
| } |
| |
| public static <OPT_T extends Enum<OPT_T> & CLIOptions<OPT_T>> |
| EnumMap<OPT_T, Optional<Object> > createConfig(CommandLine cli, OPT_T[] values, Class<OPT_T> clazz) { |
| EnumMap<OPT_T, Optional<Object> > ret = new EnumMap<>(clazz); |
| for(OPT_T option : values) { |
| ret.put(option, option.getHandler().getValue(option, cli)); |
| } |
| return ret; |
| } |
| |
| public static CommandLine parse(String name, CommandLineParser parser, String[] args, CLIOptions[] values, CLIOptions helpOption) { |
| try { |
| CommandLine cli = parser.parse(getOptions(values), args); |
| if(helpOption.has(cli)) { |
| printHelp(name, values); |
| System.exit(0); |
| } |
| return cli; |
| } catch (ParseException e) { |
| System.err.println("Unable to parse args: " + Joiner.on(' ').join(args)); |
| e.printStackTrace(System.err); |
| printHelp(name, values); |
| System.exit(-1); |
| return null; |
| } |
| } |
| } |