1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | package org.apache.hadoop.fs.shell; |
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19 | |
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20 | import java.util.ArrayList; |
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21 | import java.util.HashMap; |
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22 | import java.util.List; |
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23 | import java.util.Map; |
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24 | |
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25 | /** |
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26 | * Parse the args of a command and check the format of args. |
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27 | */ |
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28 | public class CommandFormat { |
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29 | final String name; |
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30 | final int minPar, maxPar; |
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31 | final Map<String, Boolean> options = new HashMap<String, Boolean>(); |
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32 | |
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33 | /** constructor */ |
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34 | public CommandFormat(String n, int min, int max, String ... possibleOpt) { |
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35 | name = n; |
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36 | minPar = min; |
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37 | maxPar = max; |
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38 | for(String opt : possibleOpt) |
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39 | options.put(opt, Boolean.FALSE); |
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40 | } |
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41 | |
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42 | /** Parse parameters starting from the given position |
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43 | * |
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44 | * @param args an array of input arguments |
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45 | * @param pos the position at which starts to parse |
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46 | * @return a list of parameters |
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47 | */ |
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48 | public List<String> parse(String[] args, int pos) { |
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49 | List<String> parameters = new ArrayList<String>(); |
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50 | for(; pos < args.length; pos++) { |
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51 | if (args[pos].charAt(0) == '-' && args[pos].length() > 1) { |
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52 | String opt = args[pos].substring(1); |
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53 | if (options.containsKey(opt)) |
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54 | options.put(opt, Boolean.TRUE); |
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55 | else |
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56 | throw new IllegalArgumentException("Illegal option " + args[pos]); |
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57 | } |
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58 | else |
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59 | parameters.add(args[pos]); |
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60 | } |
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61 | int psize = parameters.size(); |
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62 | if (psize < minPar || psize > maxPar) |
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63 | throw new IllegalArgumentException("Illegal number of arguments"); |
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64 | return parameters; |
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65 | } |
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66 | |
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67 | /** Return if the option is set or not |
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68 | * |
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69 | * @param option String representation of an option |
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70 | * @return true is the option is set; false otherwise |
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71 | */ |
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72 | public boolean getOpt(String option) { |
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73 | return options.get(option); |
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74 | } |
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75 | } |
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