CommandLine.java

/*
 * Copyright (c) 2016 Vivid Solutions.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v. 1.0 which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 *
 * http://www.eclipse.org/org/documents/edl-v10.php.
 */
package org.locationtech.jtstest.command;

import java.io.*;
import java.util.*;

/**
 * A class to parse Unix (and DOS/Win)-style application command-lines
 * @version 1.7
 */
public class CommandLine {

  Hashtable optSpecs  = new Hashtable();
  Vector optVec = new Vector();     // used to store options in order of entry
  char optionChar;      // the char that indicates an option.  Default is '/', which is
                        // NT Standard, but this causes problems on Unix systems, so '-' should
                        // be used for cross-platform apps

  public CommandLine()
  {
    this('/');
  }

  public CommandLine(char optionCh)
  {
    optionChar = optionCh;
  }

  public void addOptionSpec(OptionSpec optSpec)
  {
    String name = optSpec.getName();
    // should check for duplicate option names here
    optSpecs.put(name.toLowerCase(), optSpec);
    optVec.add(optSpec);
  }

  OptionSpec getOptionSpec(String name)
  {
    if (optSpecs.containsKey(name.toLowerCase()))
      return (OptionSpec) optSpecs.get(name.toLowerCase());
    return null;
  }

  public Option getOption(String name)
  {
    OptionSpec spec = getOptionSpec(name);
    if (spec == null) return null;
    return spec.getOption(0);
  }

  public Iterator getOptions(String name)
  {
    OptionSpec spec = getOptionSpec(name);
    return spec.getOptions();
  }

  public boolean hasOption(String name)
  {
    OptionSpec spec = getOptionSpec(name);
    if (spec == null) return false;
    return spec.hasOption();
  }
  /**
   *  adds an option for an <B>existing</B> option spec
   */
  void addOption(Option opt)
  {
    String name = opt.getName();
    ((OptionSpec) optSpecs.get(name.toLowerCase())).addOption(opt);
  }

  public void printDoc(PrintStream out)
  {
    OptionSpec os = null;
    out.println("Options:");
    for (Iterator i = optVec.iterator(); i.hasNext(); )
    {
      os = (OptionSpec) i.next();
      String name = optionChar + os.getName();
      if (os.getName() == OptionSpec.OPTION_FREE_ARGS) name = "(free)";
      out.println("  " + name + " " + os.getArgDesc() + " - " + os.getDocDesc());
    }
  }

  public void parse(String[] args)
    throws ParseException
  {
    String noOptMsg;
    String optName;
    Vector params = new Vector();
    int i = 0;
    int paramStart;
    while (i < args.length) {
      if (args[i].charAt(0) == optionChar) {
        optName = args[i].substring(1);
        noOptMsg = "Invalid option: " + args[i];
        paramStart = i + 1;
      }
      else {
        optName = OptionSpec.OPTION_FREE_ARGS;
        noOptMsg = "Invalid option: " + args[i];
        paramStart = i;
      }
      OptionSpec optSpec = getOptionSpec(optName);
      if (optSpec == null)
        throw new ParseException(noOptMsg);

      int expectedArgCount = optSpec.getAllowedArgs();
      // parse option args
      parseParams(args, params, paramStart, expectedArgCount);
      Option opt = optSpec.parse((String[]) params.toArray(new String[0]));
      // check for number of allowed instances here
      addOption(opt);
      i++;
      i += params.size();
    }

  }

  void parseParams(String[] args, Vector params, int i, int expectedArgCount)
  {
    params.clear();
    int count = 0;
    int expected = expectedArgCount;
    if (expectedArgCount == OptionSpec.NARGS_ZERO_OR_ONE) expected = 1;
    if (expectedArgCount == OptionSpec.NARGS_ZERO_OR_MORE) expected = 999999999;
    if (expectedArgCount == OptionSpec.NARGS_ONE_OR_MORE) expected = 999999999;
    while (i < args.length
            && count < expected
            && args[i].charAt(0) != optionChar) {
      params.addElement(args[i++]);
      count++;
    }
  }

}