| /** |
| * 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.fs.shell; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Parse the args of a command and check the format of args. |
| */ |
| public class CommandFormat { |
| final String name; |
| final int minPar, maxPar; |
| final Map<String, Boolean> options = new HashMap<String, Boolean>(); |
| |
| /** constructor */ |
| public CommandFormat(String n, int min, int max, String ... possibleOpt) { |
| name = n; |
| minPar = min; |
| maxPar = max; |
| for(String opt : possibleOpt) |
| options.put(opt, Boolean.FALSE); |
| } |
| |
| /** Parse parameters starting from the given position |
| * |
| * @param args an array of input arguments |
| * @param pos the position at which starts to parse |
| * @return a list of parameters |
| */ |
| public List<String> parse(String[] args, int pos) { |
| List<String> parameters = new ArrayList<String>(); |
| for(; pos < args.length; pos++) { |
| if (args[pos].charAt(0) == '-' && args[pos].length() > 1) { |
| String opt = args[pos].substring(1); |
| if (options.containsKey(opt)) |
| options.put(opt, Boolean.TRUE); |
| else |
| throw new IllegalArgumentException("Illegal option " + args[pos]); |
| } |
| else |
| parameters.add(args[pos]); |
| } |
| int psize = parameters.size(); |
| if (psize < minPar || psize > maxPar) |
| throw new IllegalArgumentException("Illegal number of arguments"); |
| return parameters; |
| } |
| |
| /** Return if the option is set or not |
| * |
| * @param option String representation of an option |
| * @return true is the option is set; false otherwise |
| */ |
| public boolean getOpt(String option) { |
| return options.get(option); |
| } |
| } |