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/*
*
* 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.qpid.qmf2.util;
// Misc Imports
import java.util.List;
import java.util.ArrayList;
/**
* Basic Java port of the python getopt function.
*
* Takes a standard args String array plus short form and long form options lists.
* Searches the args for options and any option arguments and stores these in optList
* any remaining args are stored in encArgs.
*
* <p>
* Example usage (paraphrased from QpidConfig):
* <pre>
* String[] longOpts = {"help", "durable", "bindings", "broker-addr=", "file-count=",
* "file-size=", "max-queue-size=", "max-queue-count=", "limit-policy=",
* "order=", "sequence", "ive", "generate-queue-events=", "force", "force-if-not-empty",
* "force-if-used", "alternate-exchange=", "passive", "timeout=", "file=", "flow-stop-size=",
* "flow-resume-size=", "flow-stop-count=", "flow-resume-count=", "argument="};
*
* try
* {
* GetOpt getopt = new GetOpt(args, "ha:bf:", longOpts);
* List<String[]> optList = getopt.getOptList();
* String[] cargs = {};
* cargs = getopt.getEncArgs().toArray(cargs);
*
* for (String[] opt : optList)
* {
* //System.out.println(opt[0] + ":" + opt[1]);
* if (opt[0].equals("-a") || opt[0].equals("--broker-addr"))
* {
* _host = opt[1];
* }
* // Just a sample - more parsing would follow....
* }
*
* int nargs = cargs.length;
* if (nargs == 0)
* {
* overview();
* }
* else
* {
* String cmd = cargs[0];
* String modifier = "";
*
* if (nargs > 1)
* {
* modifier = cargs[1];
* }
*
* if (cmd.equals("exchanges"))
* {
* if (_recursive)
* {
* exchangeListRecurse(modifier);
* }
* else
* {
* exchangeList(modifier);
* }
* }
* // Just a sample - more parsing would follow....
* }
* }
* catch (IllegalArgumentException e)
* {
* System.err.println(e.toString());
* usage();
* }
* </pre>
*
* @author Fraser Adams
*/
public final class GetOpt
{
private List<String[]> _optList = new ArrayList<String[]>();
private List<String> _encArgs = new ArrayList<String>();
/**
* Returns the options and option arguments as a list containing a String array. The first element of the array
* contains the option and the second contains any arguments if present.
*
* @return the options and option arguments
*/
public List<String[]> getOptList()
{
return _optList;
}
/**
* Returns any remaining arguments. This is any argument from a command line that doesn't begin "--" or "-".
*
* @return any remaining arguments not made available by getOptList().
*/
public List<String> getEncArgs()
{
return _encArgs;
}
/**
* Takes a standard args String array plus short form and long form options lists.
* Searches the args for options and any option arguments and stores these in optList
* any remaining args are stored in encArgs.
*
* @param args standard arg String array
* @param opts short form option list of the form "ab:cd:" where b and d are options with arguments.
* @param longOpts long form option list as an array of strings. "option=" signifies an options with arguments.
*/
public GetOpt(String[] args, String opts, String[] longOpts) throws IllegalArgumentException
{
int argslength = args.length;
for (int i = 0; i < argslength; i++)
{
String arg = args[i];
if (arg.startsWith("--"))
{
String extractedOption = arg.substring(2);
int nargs = _optList.size();
for (String j : longOpts)
{
String k = j.substring(0, j.length() - 1);
if (j.equals(extractedOption) || k.equals(extractedOption))
{ // Handle where option and value are space separated
String arg0 = arg;
String arg1 = "";
if (i < argslength - 1 && k.equals(extractedOption))
{
i++;
arg1 = args[i];
}
String[] option = {arg0, arg1};
_optList.add(option);
}
else
{ // Handle where option and value are separated by '='
String[] split = arg.split("=", 2); // Split on the first occurrence of '='
String arg0 = split[0];
String arg1 = "";
if (split.length == 2)
{
j = j.substring(0, j.length() - 1);
arg1 = split[1];
}
if (arg0.substring(2).equals(j))
{
String[] option = {arg0, arg1};
_optList.add(option);
}
}
}
if (nargs == _optList.size())
{
throw new IllegalArgumentException("Unknown Option " + arg);
}
}
else if (arg.startsWith("-"))
{
String extractedOption = arg.substring(1);
int index = opts.indexOf(extractedOption);
if (index++ != -1)
{
String arg1 = "";
if (i < argslength - 1 && index < opts.length() && opts.charAt(index) == ':')
{
i++;
arg1 = args[i];
}
String[] option = {arg, arg1};
_optList.add(option);
}
else
{
throw new IllegalArgumentException("Unknown Option " + arg);
}
}
else
{
_encArgs.add(arg);
}
}
}
}
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