joptsimple.ArgumentAcceptingOptionSpec Maven / Gradle / Ivy
/*
The MIT License
Copyright (c) 2004-2015 Paul R. Holser, Jr.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
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The above copyright notice and this permission notice shall be
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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*/
package joptsimple;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import static java.util.Collections.*;
import static java.util.Objects.*;
import static joptsimple.internal.Reflection.*;
import static joptsimple.internal.Strings.*;
/**
* Specification of an option that accepts an argument.
*
* Instances are returned from {@link OptionSpecBuilder} methods 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 an instance of this class, then that instance's option will treat its argument as
* a {@link String}.
*
* @param represents the type of the arguments this option accepts
* @author Paul Holser
*/
public abstract class ArgumentAcceptingOptionSpec extends AbstractOptionSpec {
private static final char NIL_VALUE_SEPARATOR = '\u0000';
private final boolean argumentRequired;
private final List defaultValues = new ArrayList<>();
private boolean optionRequired;
private ValueConverter converter;
private String argumentDescription = "";
private String valueSeparator = String.valueOf( NIL_VALUE_SEPARATOR );
ArgumentAcceptingOptionSpec( String option, boolean argumentRequired ) {
super( option );
this.argumentRequired = argumentRequired;
}
ArgumentAcceptingOptionSpec( List options, boolean argumentRequired, String description ) {
super( options, description );
this.argumentRequired = argumentRequired;
}
/**
* Specifies a type to which arguments of this spec's option are to be converted.
*
* JOpt Simple accepts types that have either:
*
*
* - a public static method called {@code valueOf} which accepts a single argument of type {@link String}
* and whose return type is the same as the class on which the method is declared. The {@code java.lang}
* primitive wrapper classes have such methods.
*
* - a public constructor which accepts a single argument of type {@link String}.
*
*
* This class converts arguments using those methods in that order; that is, {@code valueOf} would be invoked
* before a one-{@link String}-arg constructor would.
*
* Invoking this method will trump any previous calls to this method or to
* {@link #withValuesConvertedBy(ValueConverter)}.
*
* @param represents the runtime class of the desired option argument type
* @param argumentType desired type of arguments to this spec's option
* @return self, so that the caller can add clauses to the fluent interface sentence
* @throws NullPointerException if the type is {@code null}
* @throws IllegalArgumentException if the type does not have the standard conversion methods
*/
public final ArgumentAcceptingOptionSpec ofType( Class argumentType ) {
return withValuesConvertedBy( findConverter( argumentType ) );
}
/**
* Specifies a converter to use to translate arguments of this spec's option into Java objects. This is useful
* when converting to types that do not have the requisite factory method or constructor for
* {@link #ofType(Class)}.
*
* Invoking this method will trump any previous calls to this method or to {@link #ofType(Class)}.
*
* @param represents the runtime class of the desired option argument type
* @param aConverter the converter to use
* @return self, so that the caller can add clauses to the fluent interface sentence
* @throws NullPointerException if the converter is {@code null}
*/
@SuppressWarnings( "unchecked" )
public final ArgumentAcceptingOptionSpec withValuesConvertedBy( ValueConverter aConverter ) {
if ( aConverter == null )
throw new NullPointerException( "illegal null converter" );
converter = (ValueConverter) aConverter;
return (ArgumentAcceptingOptionSpec) this;
}
/**
* Specifies a description for the argument of the option that this spec represents. This description is used
* when generating help information about the parser.
*
* @param description describes the nature of the argument of this spec's option
* @return self, so that the caller can add clauses to the fluent interface sentence
*/
public final ArgumentAcceptingOptionSpec describedAs( String description ) {
argumentDescription = description;
return this;
}
/**
* Specifies a value separator for the argument of the option that this spec represents. This allows a single
* option argument to represent multiple values for the option. For example:
*
*
*
* parser.accepts( "z" ).withRequiredArg()
* .withValuesSeparatedBy( ',' );
* OptionSet options = parser.parse( new String[] { "-z", "foo,bar,baz", "-z",
* "fizz", "-z", "buzz" } );
*
*
*
* Then options.valuesOf( "z" ) would yield the list {@code [foo, bar, baz, fizz, buzz]}.
*
* You cannot use Unicode U+0000 as the separator.
*
* @param separator a character separator
* @return self, so that the caller can add clauses to the fluent interface sentence
* @throws IllegalArgumentException if the separator is Unicode U+0000
*/
public final ArgumentAcceptingOptionSpec withValuesSeparatedBy( char separator ) {
if ( separator == NIL_VALUE_SEPARATOR )
throw new IllegalArgumentException( "cannot use U+0000 as separator" );
valueSeparator = String.valueOf( separator );
return this;
}
/**
* Specifies a value separator for the argument of the option that this spec represents. This allows a single
* option argument to represent multiple values for the option. For example:
*
*
*
* parser.accepts( "z" ).withRequiredArg()
* .withValuesSeparatedBy( ":::" );
* OptionSet options = parser.parse( new String[] { "-z", "foo:::bar:::baz", "-z",
* "fizz", "-z", "buzz" } );
*
*
*
* Then options.valuesOf( "z" ) would yield the list {@code [foo, bar, baz, fizz, buzz]}.
*
* You cannot use Unicode U+0000 in the separator.
*
* @param separator a string separator
* @return self, so that the caller can add clauses to the fluent interface sentence
* @throws IllegalArgumentException if the separator contains Unicode U+0000
*/
public final ArgumentAcceptingOptionSpec withValuesSeparatedBy( String separator ) {
if ( separator.indexOf( NIL_VALUE_SEPARATOR ) != -1 )
throw new IllegalArgumentException( "cannot use U+0000 in separator" );
valueSeparator = separator;
return this;
}
/**
* Specifies a set of default values for the argument of the option that this spec represents.
*
* @param value the first in the set of default argument values for this spec's option
* @param values the (optional) remainder of the set of default argument values for this spec's option
* @return self, so that the caller can add clauses to the fluent interface sentence
* @throws NullPointerException if {@code value}, {@code values}, or any elements of {@code values} are
* {@code null}
*/
@SafeVarargs
public final ArgumentAcceptingOptionSpec defaultsTo( V value, V... values ) {
addDefaultValue( value );
defaultsTo( values );
return this;
}
/**
* Specifies a set of default values for the argument of the option that this spec represents.
*
* @param values the set of default argument values for this spec's option
* @return self, so that the caller can add clauses to the fluent interface sentence
* @throws NullPointerException if {@code values} or any elements of {@code values} are {@code null}
*/
public ArgumentAcceptingOptionSpec defaultsTo( V[] values ) {
for ( V each : values )
addDefaultValue( each );
return this;
}
/**
* Marks this option as required. An {@link OptionException} will be thrown when
* {@link OptionParser#parse(java.lang.String...)} is called, if an option is marked as required and not specified
* on the command line.
*
* @return self, so that the caller can add clauses to the fluent interface sentence
*/
public ArgumentAcceptingOptionSpec required() {
optionRequired = true;
return this;
}
public boolean isRequired() {
return optionRequired;
}
private void addDefaultValue( V value ) {
requireNonNull( value );
defaultValues.add( value );
}
@Override
final void handleOption( OptionParser parser, ArgumentList arguments, OptionSet detectedOptions,
String detectedArgument ) {
if ( isNullOrEmpty( detectedArgument ) )
detectOptionArgument( parser, arguments, detectedOptions );
else
addArguments( detectedOptions, detectedArgument );
}
protected void addArguments( OptionSet detectedOptions, String detectedArgument ) {
StringTokenizer lexer = new StringTokenizer( detectedArgument, valueSeparator );
if ( !lexer.hasMoreTokens() )
detectedOptions.addWithArgument( this, detectedArgument );
else {
while ( lexer.hasMoreTokens() )
detectedOptions.addWithArgument( this, lexer.nextToken() );
}
}
protected abstract void detectOptionArgument( OptionParser parser, ArgumentList arguments,
OptionSet detectedOptions );
@Override
protected final V convert( String argument ) {
return convertWith( converter, argument );
}
protected boolean canConvertArgument( String argument ) {
StringTokenizer lexer = new StringTokenizer( argument, valueSeparator );
try {
while ( lexer.hasMoreTokens() )
convert( lexer.nextToken() );
return true;
} catch ( OptionException ignored ) {
return false;
}
}
protected boolean isArgumentOfNumberType() {
return converter != null && Number.class.isAssignableFrom( converter.valueType() );
}
public boolean acceptsArguments() {
return true;
}
public boolean requiresArgument() {
return argumentRequired;
}
public String argumentDescription() {
return argumentDescription;
}
public String argumentTypeIndicator() {
return argumentTypeIndicatorFrom( converter );
}
public List defaultValues() {
return unmodifiableList( defaultValues );
}
@Override
public boolean equals( Object that ) {
if ( !super.equals( that ) )
return false;
ArgumentAcceptingOptionSpec other = (ArgumentAcceptingOptionSpec) that;
return requiresArgument() == other.requiresArgument();
}
@Override
public int hashCode() {
return super.hashCode() ^ ( argumentRequired ? 0 : 1 );
}
}