Java tutorial
/** * Copyright 2017 Goldman Sachs. * Licensed 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 com.gs.obevo.util; import java.util.List; import com.sampullara.cli.Args; import org.apache.commons.lang.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Notes on using cli pos: * -if you want to use subclasses for args, then make the variables public * Note that if you set the variables as private, then it would read it on that class, but * not on subclasses due to implementation * personally, i prefer using the field + annotation directly over setters (that is too cumbersome) */ public class ArgsParser { private static final Logger LOG = LoggerFactory.getLogger(ArgsParser.class); public <T> T parse(String[] args, T inputArgs) { try { List<String> extraArgs = Args.parse(inputArgs, args); if (extraArgs.size() > 0) { Args.usage(inputArgs); System.err.println("Passed in unnecessary args: " + StringUtils.join(extraArgs, "; ")); System.exit(-1); } } catch (IllegalArgumentException exc) { Args.usage(inputArgs); exc.printStackTrace(); System.exit(-1); } LOG.info("Arguments parsed: " + inputArgs.toString()); return inputArgs; } }