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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.hadoop.fs.shell;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Parse the args of a command and check the format of args.
*/
public class CommandFormat {
final int minPar, maxPar;
final Map options = new HashMap();
final Map optionsWithValue = new HashMap();
boolean ignoreUnknownOpts = false;
/**
* @deprecated use replacement since name is an unused parameter
* @param name of command, but never used
* @param min see replacement
* @param max see replacement
* @param possibleOpt see replacement
* @see #CommandFormat(int, int, String...)
*/
@Deprecated
public CommandFormat(String name, int min, int max, String ... possibleOpt) {
this(min, max, possibleOpt);
}
/**
* Simple parsing of command line arguments
* @param min minimum arguments required
* @param max maximum arguments permitted
* @param possibleOpt list of the allowed switches
*/
public CommandFormat(int min, int max, String ... possibleOpt) {
minPar = min;
maxPar = max;
for (String opt : possibleOpt) {
if (opt == null) {
ignoreUnknownOpts = true;
} else {
options.put(opt, Boolean.FALSE);
}
}
}
/**
* add option with value
*
* @param option option name
*/
public void addOptionWithValue(String option) {
if (options.containsKey(option)) {
throw new DuplicatedOptionException(option);
}
optionsWithValue.put(option, null);
}
/** Parse parameters starting from the given position
* Consider using the variant that directly takes a List
*
* @param args an array of input arguments
* @param pos the position at which starts to parse
* @return a list of parameters
*/
public List parse(String[] args, int pos) {
List parameters = new ArrayList(Arrays.asList(args));
parameters.subList(0, pos).clear();
parse(parameters);
return parameters;
}
/** Parse parameters from the given list of args. The list is
* destructively modified to remove the options.
*
* @param args as a list of input arguments
*/
public void parse(List args) {
int pos = 0;
while (pos < args.size()) {
String arg = args.get(pos);
// stop if not an opt, or the stdin arg "-" is found
if (!arg.startsWith("-") || arg.equals("-")) {
break;
} else if (arg.equals("--")) { // force end of option processing
args.remove(pos);
break;
}
String opt = arg.substring(1);
if (options.containsKey(opt)) {
args.remove(pos);
options.put(opt, Boolean.TRUE);
} else if (optionsWithValue.containsKey(opt)) {
args.remove(pos);
if (pos < args.size() && (args.size() > minPar)
&& !args.get(pos).startsWith("-")) {
arg = args.get(pos);
args.remove(pos);
} else {
arg = "";
}
if (!arg.startsWith("-") || arg.equals("-")) {
optionsWithValue.put(opt, arg);
}
} else if (ignoreUnknownOpts) {
pos++;
} else {
throw new UnknownOptionException(arg);
}
}
int psize = args.size();
if (psize < minPar) {
throw new NotEnoughArgumentsException(minPar, psize);
}
if (psize > maxPar) {
throw new TooManyArgumentsException(maxPar, psize);
}
}
/** 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.containsKey(option) ? options.get(option) : false;
}
/**
* get the option's value
*
* @param option option name
* @return option value
* if option exists, but no value assigned, return ""
* if option not exists, return null
*/
public String getOptValue(String option) {
return optionsWithValue.get(option);
}
/** Returns all the options that are set
*
* @return Set{@literal <}String{@literal >} of the enabled options
*/
public Set getOpts() {
Set optSet = new HashSet();
for (Map.Entry entry : options.entrySet()) {
if (entry.getValue()) {
optSet.add(entry.getKey());
}
}
return optSet;
}
/** Used when the arguments exceed their bounds
*/
public static abstract class IllegalNumberOfArgumentsException
extends IllegalArgumentException {
private static final long serialVersionUID = 0L;
protected int expected;
protected int actual;
protected IllegalNumberOfArgumentsException(int want, int got) {
expected = want;
actual = got;
}
@Override
public String getMessage() {
return "expected " + expected + " but got " + actual;
}
}
/** Used when too many arguments are supplied to a command
*/
public static class TooManyArgumentsException
extends IllegalNumberOfArgumentsException {
private static final long serialVersionUID = 0L;
public TooManyArgumentsException(int expected, int actual) {
super(expected, actual);
}
@Override
public String getMessage() {
return "Too many arguments: " + super.getMessage();
}
}
/** Used when too few arguments are supplied to a command
*/
public static class NotEnoughArgumentsException
extends IllegalNumberOfArgumentsException {
private static final long serialVersionUID = 0L;
public NotEnoughArgumentsException(int expected, int actual) {
super(expected, actual);
}
@Override
public String getMessage() {
return "Not enough arguments: " + super.getMessage();
}
}
/** Used when an unsupported option is supplied to a command
*/
public static class UnknownOptionException extends IllegalArgumentException {
private static final long serialVersionUID = 0L;
protected String option = null;
public UnknownOptionException(String unknownOption) {
super("Illegal option " + unknownOption);
option = unknownOption;
}
public String getOption() {
return option;
}
}
/**
* Used when a duplicated option is supplied to a command.
*/
public static class DuplicatedOptionException extends IllegalArgumentException {
private static final long serialVersionUID = 0L;
public DuplicatedOptionException(String duplicatedOption) {
super("option " + duplicatedOption + " already exists!");
}
}
}
