org.springframework.core.env

Class SimpleCommandLinePropertySource

java.lang.Object

org.springframework.core.env.PropertySource<T>

org.springframework.core.env.EnumerablePropertySource<T>

org.springframework.core.env.CommandLinePropertySource<org.springframework.core.env.CommandLineArgs>

org.springframework.core.env.SimpleCommandLinePropertySource

public class SimpleCommandLinePropertySource
extends CommandLinePropertySource<org.springframework.core.env.CommandLineArgs>

CommandLinePropertySource implementation backed by a simple String array.

Purpose

This CommandLinePropertySource implementation aims to provide the simplest possible approach to parsing command line arguments. As with all CommandLinePropertySource implementations, command line arguments are broken into two distinct groups: option arguments and non-option arguments, as described below (some sections copied from Javadoc for SimpleCommandLineArgsParser):

Working with option arguments

Option arguments must adhere to the exact syntax:

--optName[=optValue]

That is, options must be prefixed with "--" and may or may not specify a value. If a value is specified, the name and value must be separated without spaces by an equals sign ("="). The value may optionally be an empty string.

Valid examples of option arguments

 --foo
 --foo=
 --foo=""
 --foo=bar
 --foo="bar then baz"
 --foo=bar,baz,biz

Invalid examples of option arguments

 -foo
 --foo bar
 --foo = bar
 --foo=bar --foo=baz --foo=biz

Working with non-option arguments

Any and all arguments specified at the command line without the "--" option prefix will be considered as "non-option arguments" and made available through the CommandLineArgs.getNonOptionArgs() method.

Typical usage

 public static void main(String[] args) {
     PropertySource ps = new SimpleCommandLinePropertySource(args);
     // ...
 }

See CommandLinePropertySource for complete general usage examples.

Beyond the basics

When more fully-featured command line parsing is necessary, consider using the provided JOptCommandLinePropertySource, or implement your own CommandLinePropertySource against the command line parsing library of your choice.

Since:

3.1

Author:

Chris Beams

See Also:

CommandLinePropertySource, JOptCommandLinePropertySource

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.core.env.PropertySource

PropertySource.StubPropertySource

Field Summary

Fields inherited from class org.springframework.core.env.CommandLinePropertySource

COMMAND_LINE_PROPERTY_SOURCE_NAME, DEFAULT_NON_OPTION_ARGS_PROPERTY_NAME

Fields inherited from class org.springframework.core.env.PropertySource

logger, name, source

Constructor Summary

Constructors

Constructor and Description
SimpleCommandLinePropertySource(String... args) Create a new SimpleCommandLinePropertySource having the default name and backed by the given String[] of command line arguments.
SimpleCommandLinePropertySource(String name, String[] args) Create a new SimpleCommandLinePropertySource having the given name and backed by the given String[] of command line arguments.

Method Summary

Modifier and Type	Method and Description
protected boolean	containsOption(String name) Return whether the set of option arguments parsed from the command line contains an option with the given name.
protected List<String>	getNonOptionArgs() Return the collection of non-option arguments parsed from the command line.
protected List<String>	getOptionValues(String name) Return the collection of values associated with the command line option having the given name.
String[]	getPropertyNames() Get the property names for the option arguments.

Methods inherited from class org.springframework.core.env.CommandLinePropertySource

containsProperty, getProperty, setNonOptionArgsPropertyName

Methods inherited from class org.springframework.core.env.PropertySource

equals, getName, getSource, hashCode, named, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SimpleCommandLinePropertySource

public SimpleCommandLinePropertySource(String... args)

Create a new SimpleCommandLinePropertySource having the default name and backed by the given String[] of command line arguments.

See Also:

CommandLinePropertySource.COMMAND_LINE_PROPERTY_SOURCE_NAME, CommandLinePropertySource(Object)

SimpleCommandLinePropertySource

public SimpleCommandLinePropertySource(String name,
                                       String[] args)

Create a new SimpleCommandLinePropertySource having the given name and backed by the given String[] of command line arguments.

Method Detail

getPropertyNames

public String[] getPropertyNames()

Get the property names for the option arguments.

Specified by:

getPropertyNames in class EnumerablePropertySource<org.springframework.core.env.CommandLineArgs>

containsOption

protected boolean containsOption(String name)

Description copied from class: CommandLinePropertySource

Return whether the set of option arguments parsed from the command line contains an option with the given name.

Specified by:

containsOption in class CommandLinePropertySource<org.springframework.core.env.CommandLineArgs>

getOptionValues

@Nullable
protected List<String> getOptionValues(String name)

Description copied from class: CommandLinePropertySource

Return the collection of values associated with the command line option having the given name.

• if the option is present and has no argument (e.g.: "--foo"), return an empty collection ([])
• if the option is present and has a single value (e.g. "--foo=bar"), return a collection having one element (["bar"])
• if the option is present and the underlying command line parsing library supports multiple arguments (e.g. "--foo=bar --foo=baz"), return a collection having elements for each value (["bar", "baz"])
• if the option is not present, return null

Specified by:

getOptionValues in class CommandLinePropertySource<org.springframework.core.env.CommandLineArgs>

getNonOptionArgs

protected List<String> getNonOptionArgs()

Description copied from class: CommandLinePropertySource

Return the collection of non-option arguments parsed from the command line. Never null.

Specified by:

getNonOptionArgs in class CommandLinePropertySource<org.springframework.core.env.CommandLineArgs>