CommandFormat.java
上传用户:quxuerui
上传日期:2018-01-08
资源大小:41811k
文件大小:2k
- /**
- * 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);
- }
- }