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java.lang.Objectjoptsimple.OptionParser
public class OptionParser
Parses command line arguments, using a syntax that attempts to take from the best
of POSIX getopt() and GNU getopt_long().
This parser supports short options and long options.
Number, then that argument is treated as the
negative number argument of the option, even if the parser recognizes the
corresponding numeric option. For example:
OptionParser parser = new OptionParser();
parser.accepts( "a" ).withOptionalArg().ofType( Integer.class );
parser.accepts( "2" );
OptionSet options = parser.parse( "-a", "-2" );
In this case, the option set contains "a" with argument -2,
not both "a" and "2". Swapping the elements in the
args array gives the latter.There are two ways to tell the parser what options to recognize:
accepts or acceptsAll
methods; calls on the ensuing chain of objects describe whether the options can take
an argument, whether the argument is required or optional, to what type arguments of
the options should be converted if any, etc. Since version 3, these calls return
an instance of OptionSpec, which can subsequently be used to retrieve the
arguments of the associated option in a type-safe manner.String. Here are the rules for the
format of the specification strings this constructor accepts:
Each of the options in a list of options given to acceptsAll is treated as a synonym of the others. For example:
OptionParser parser = new OptionParser();
parser.acceptsAll( asList( "w", "interactive", "confirmation" ) );
OptionSet options = parser.parse( "-w" );
In this case, options.has would answer
true when given arguments "w", "interactive", and
"confirmation". The OptionSet would give the same responses to
these arguments for its other methods as well.
By default, as with GNU getopt(), the parser allows intermixing of options
and non-options. If, however, the parser has been created to be "POSIX-ly correct",
then the first argument that does not look lexically like an option, and is not a
required argument of a preceding option, signals the end of options. You can still
bind optional arguments to their options using the abutting (for short options) or
= syntax.
Unlike GNU getopt(), this parser does not honor the environment variable
POSIXLY_CORRECT. "POSIX-ly correct" parsers are configured by either:
posixlyCorrect(boolean), or
| Field Summary | |
|---|---|
private boolean |
posixlyCorrect
|
private AbbreviationMap<AbstractOptionSpec<?>> |
recognizedOptions
|
private OptionParserState |
state
|
| Constructor Summary | |
|---|---|
OptionParser()
Creates an option parser that initially recognizes no options, and does not exhibit "POSIX-ly correct" behavior. |
|
OptionParser(java.lang.String optionSpecification)
Creates an option parser and configures it to recognize the short options specified in the given string. |
|
| Method Summary | |
|---|---|
OptionSpecBuilder |
accepts(java.lang.String option)
Tells the parser to recognize the given option. |
OptionSpecBuilder |
accepts(java.lang.String option,
java.lang.String description)
Tells the parser to recognize the given option. |
OptionSpecBuilder |
acceptsAll(java.util.Collection<java.lang.String> options)
Tells the parser to recognize the given options, and treat them as synonymous. |
OptionSpecBuilder |
acceptsAll(java.util.Collection<java.lang.String> options,
java.lang.String description)
Tells the parser to recognize the given options, and treat them as synonymous. |
private static char[] |
extractShortOptionsFrom(java.lang.String argument)
|
(package private) void |
handleLongOptionToken(java.lang.String candidate,
ArgumentList arguments,
OptionSet detected)
|
private void |
handleShortOptionCluster(java.lang.String candidate,
ArgumentList arguments,
OptionSet detected)
|
(package private) void |
handleShortOptionToken(java.lang.String candidate,
ArgumentList arguments,
OptionSet detected)
|
private boolean |
isRecognized(java.lang.String option)
|
(package private) boolean |
looksLikeAnOption(java.lang.String argument)
|
(package private) void |
noMoreOptions()
|
OptionSet |
parse(java.lang.String... arguments)
Parses the given command line arguments according to the option specifications given to the parser. |
private static KeyValuePair |
parseLongOptionWithArgument(java.lang.String argument)
|
private static KeyValuePair |
parseShortOptionWithArgument(java.lang.String argument)
|
(package private) boolean |
posixlyCorrect()
|
void |
posixlyCorrect(boolean setting)
Tells the parser whether or not to behave "POSIX-ly correct"-ly. |
void |
printHelpOn(java.io.OutputStream sink)
Writes information about the options this parser recognizes to the given output sink. |
void |
printHelpOn(java.io.Writer sink)
Writes information about the options this parser recognizes to the given output sink. |
(package private) void |
recognize(AbstractOptionSpec<?> spec)
|
void |
recognizeAlternativeLongOptions(boolean recognize)
Tells the parser either to recognize or ignore "-W"-style long options. |
private void |
reset()
|
private AbstractOptionSpec<?> |
specFor(char option)
|
private AbstractOptionSpec<?> |
specFor(java.lang.String option)
|
private void |
validateOptionCharacters(char[] options)
|
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
|---|
private final AbbreviationMap<AbstractOptionSpec<?>> recognizedOptions
private OptionParserState state
private boolean posixlyCorrect
| Constructor Detail |
|---|
public OptionParser()
Creates an option parser that initially recognizes no options, and does not exhibit "POSIX-ly correct" behavior.
public OptionParser(java.lang.String optionSpecification)
Creates an option parser and configures it to recognize the short options specified in the given string.
Arguments of options specified this way will be of type String.
optionSpecification - an option specification
java.lang.NullPointerException - if optionSpecification is
null
OptionException - if the option specification contains illegal characters
or otherwise cannot be recognized| Method Detail |
|---|
public OptionSpecBuilder accepts(java.lang.String option)
Tells the parser to recognize the given option.
This method returns an instance of OptionSpecBuilder to allow the
formation of parser directives as sentences in a fluent interface language.
For example:
OptionParser parser = new OptionParser();
parser.accepts( "c" ).withRequiredArg().ofType( Integer.class );
If no methods are invoked on the returned OptionSpecBuilder, then the
parser treats the option as accepting no argument.
option - the option to recognize
OptionException - if the option contains illegal characters
java.lang.NullPointerException - if the option is null
public OptionSpecBuilder accepts(java.lang.String option,
java.lang.String description)
Tells the parser to recognize the given option.
option - the option to recognizedescription - a string that describes the purpose of the option. This is
used when generating help information about the parser.
OptionException - if the option contains illegal characters
java.lang.NullPointerException - if the option is nullaccepts(String)public OptionSpecBuilder acceptsAll(java.util.Collection<java.lang.String> options)
Tells the parser to recognize the given options, and treat them as synonymous.
options - the options to recognize and treat as synonymous
OptionException - if any of the options contain illegal characters
java.lang.NullPointerException - if the option list or any of its elements are
nullaccepts(String)
public OptionSpecBuilder acceptsAll(java.util.Collection<java.lang.String> options,
java.lang.String description)
Tells the parser to recognize the given options, and treat them as synonymous.
options - the options to recognize and treat as synonymousdescription - a string that describes the purpose of the option. This is
used when generating help information about the parser.
OptionException - if any of the options contain illegal characters
java.lang.NullPointerException - if the option list or any of its elements are
null
java.lang.IllegalArgumentException - if the option list is emptyacceptsAll(Collection)public void posixlyCorrect(boolean setting)
Tells the parser whether or not to behave "POSIX-ly correct"-ly.
setting - true if the parser should behave "POSIX-ly correct"-lyboolean posixlyCorrect()
public void recognizeAlternativeLongOptions(boolean recognize)
Tells the parser either to recognize or ignore "-W"-style long options.
recognize - true if the parser is to recognize the special style
of long optionsvoid recognize(AbstractOptionSpec<?> spec)
public void printHelpOn(java.io.OutputStream sink)
throws java.io.IOException
Writes information about the options this parser recognizes to the given output sink.
The output sink is flushed, but not closed.
sink - the sink to write information to
java.io.IOException - if there is a problem writing to the sink
java.lang.NullPointerException - if sink is nullprintHelpOn(Writer)
public void printHelpOn(java.io.Writer sink)
throws java.io.IOException
Writes information about the options this parser recognizes to the given output sink.
The output sink is flushed, but not closed.
sink - the sink to write information to
java.io.IOException - if there is a problem writing to the sink
java.lang.NullPointerException - if sink is nullprintHelpOn(OutputStream)public OptionSet parse(java.lang.String... arguments)
Parses the given command line arguments according to the option specifications given to the parser.
arguments - arguments to parse
OptionSet describing the parsed options, their arguments, and
any non-option arguments found
OptionException - if problems are detected while parsing
java.lang.NullPointerException - if the argument list is null
void handleLongOptionToken(java.lang.String candidate,
ArgumentList arguments,
OptionSet detected)
void handleShortOptionToken(java.lang.String candidate,
ArgumentList arguments,
OptionSet detected)
private void handleShortOptionCluster(java.lang.String candidate,
ArgumentList arguments,
OptionSet detected)
void noMoreOptions()
boolean looksLikeAnOption(java.lang.String argument)
private boolean isRecognized(java.lang.String option)
private AbstractOptionSpec<?> specFor(char option)
private AbstractOptionSpec<?> specFor(java.lang.String option)
private void reset()
private static char[] extractShortOptionsFrom(java.lang.String argument)
private void validateOptionCharacters(char[] options)
private static KeyValuePair parseLongOptionWithArgument(java.lang.String argument)
private static KeyValuePair parseShortOptionWithArgument(java.lang.String argument)
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