com.google.gwt.util.tools

Class ArgHandler

java.lang.Object

com.google.gwt.util.tools.ArgHandler

Direct Known Subclasses:

ArgHandlerDir, ArgHandlerExtra, ArgHandlerFile, ArgHandlerFlag, ArgHandlerInt, ArgHandlerLogLevel, ArgHandlerScriptStyle, ArgHandlerString

public abstract class ArgHandler
extends Object

Base class for command line argument handlers.

Constructor Summary

Constructors

Constructor and Description
ArgHandler()

Method Summary

Modifier and Type	Method and Description
String[]	getDefaultArgs()
String	getHelpTag() The tag to display in help messages.
abstract String	getPurpose()
abstract String	getTag()
abstract String[]	getTagArgs() A list of words representing the arguments in help text.
String[]	getTags() The set of tags matched by this argument handler.
abstract int	handle(String[] args, int tagIndex) Attempts to process one flag or "extra" command-line argument (that appears without a flag).
boolean	isExperimental()
boolean	isRequired()
boolean	isUndocumented()

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, toString

Constructor Detail

ArgHandler

public ArgHandler()

Method Detail

getDefaultArgs

public String[] getDefaultArgs()

getPurpose

public abstract String getPurpose()

getTag

public abstract String getTag()

getTags

public String[] getTags()

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.

getHelpTag

public String getHelpTag()

The tag to display in help messages.

getTagArgs

public abstract String[] getTagArgs()

A list of words representing the arguments in help text.

handle

public abstract int handle(String[] args,
                           int tagIndex)

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

Parameters:

args - the arguments passed in to main()

tagIndex - 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()

isUndocumented

public boolean isUndocumented()

isExperimental

public boolean isExperimental()