Package com.google.gwt.util.tools

Class ArgHandlerFlag

java.lang.Object

com.google.gwt.util.tools.ArgHandler

com.google.gwt.util.tools.ArgHandlerFlag

Direct Known Subclasses:

ArgHandlerIgnore, ArgHandlerOverwrite

public abstract class ArgHandlerFlag
extends ArgHandler

Argument handler for boolean flags that have no parameters. Supports toggling the boolean value on and off using -label and -nolabel tag variants and calculating a meaningful purpose including default value.

Constructor Summary

Constructors

Constructor	Description
ArgHandlerFlag()

Method Summary

Modifier and Type	Method	Description
protected void	addTagValue(String tag, boolean value)
abstract boolean	getDefaultValue()	Returns the default value that will appear in help messages.
String	getHelpTag()	The tag to display in help messages.
String	getLabel()	The root String that will be munged into -label and -nolabel variants for flag value toggling.
final String	getPurpose()
abstract String	getPurposeSnippet()	Returns a description that will be mixed together with default value to come up with the overall flag purpose.
final String	getTag()	The primary tag matched by this argument handler.
String[]	getTagArgs()	A list of words representing the arguments in help text.
final String[]	getTags()	The set of tags matched by this argument handler.
(package private) boolean	getValueByTag(String tag)
int	handle(String[] args, int startIndex)	Attempts to process one flag or "extra" command-line argument (that appears without a flag).
boolean	isRequired()
abstract boolean	setFlag(boolean value)	Takes the explicitly provided value and propagates it into whatever option settings this flag controls.

Methods inherited from class com.google.gwt.util.tools.ArgHandler

getDefaultArgs, isExperimental, isUndocumented

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ArgHandlerFlag

public ArgHandlerFlag()

Method Details

addTagValue

protected void addTagValue(String tag,
 boolean value)

getDefaultValue

public abstract boolean getDefaultValue()

Returns the default value that will appear in help messages.

getHelpTag

public String getHelpTag()

Description copied from class: ArgHandler

The tag to display in help messages.

Overrides:

getHelpTag in class ArgHandler

getLabel

public String getLabel()

The root String that will be munged into -label and -nolabel variants for flag value toggling. Should follow the verb[Adjective]Noun naming pattern. For example:

getPurpose

public final String getPurpose()

Specified by:

getPurpose in class ArgHandler

getPurposeSnippet

public abstract String getPurposeSnippet()

Returns a description that will be mixed together with default value to come up with the overall flag purpose.

getTag

public final String getTag()

The primary tag matched by this argument handler.

Specified by:

getTag in class ArgHandler

getTagArgs

public String[] getTagArgs()

Description copied from class: ArgHandler

A list of words representing the arguments in help text.

Specified by:

getTagArgs in class ArgHandler

getTags

public final String[] getTags()

Description copied from class: ArgHandler

The set of tags matched by this argument handler. By default includes just the one primary tag mentioned in getTag() but can be overridden to provide broader matching.

Overrides:

getTags in class ArgHandler

getValueByTag

boolean getValueByTag(String tag)

handle

public int handle(String[] args,
 int startIndex)

Description copied from class: ArgHandler

Attempts to process one flag or "extra" command-line argument (that appears without a flag).

Specified by:

handle in class ArgHandler

Parameters:

args - the arguments passed in to main()

startIndex - an index into args indicating the first argument to use. If this is a handler for a flag argument. Otherwise it's the index of the "extra" argument.

Returns:

the number of additional arguments consumed, not including the flag or extra argument. Alternately, returns -1 if the argument cannot be used. This will causes the program to abort and usage to be displayed.

isRequired

public boolean isRequired()

Overrides:

isRequired in class ArgHandler

setFlag

public abstract boolean setFlag(boolean value)

Takes the explicitly provided value and propagates it into whatever option settings this flag controls.

Parameters:

value - the new value for the flag.

Returns:

whether the assignment was valid.