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## 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
`ArgHandlerFlag()`

Method Summary
`protected void` | `addTagValue(java.lang.String tag, boolean value)`
`abstract boolean` | `getDefaultValue()` Returns the default value that will appear in help messages.
`java.lang.String` | `getHelpTag()` The tag to display in help messages.
`java.lang.String` | `getLabel()` The root String that will be munged into -label and -nolabel variants for flag value toggling.
`java.lang.String` | `getPurpose()`
`abstract java.lang.String` | `getPurposeSnippet()` Returns a description that will be mixed together with default value to come up with the overall flag purpose.
`java.lang.String` | `getTag()` The primary tag matched by this argument handler.
`java.lang.String[]` | `getTagArgs()` A list of words representing the arguments in help text.
`java.lang.String[]` | `getTags()` The set of tags matched by this argument handler.
`(package private) boolean` | `getValueByTag(java.lang.String tag)`
`int` | `handle(java.lang.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 Detail

### ArgHandlerFlag

    public ArgHandlerFlag()

Method Detail

### addTagValue

    protected void addTagValue(java.lang.String tag,
                               boolean value)

### getDefaultValue

    public abstract boolean getDefaultValue()

  Returns the default value that will appear in help messages.

### getHelpTag

    public java.lang.String getHelpTag()

  Description copied from class: `ArgHandler`
  The tag to display in help messages.

  Overrides:
    `getHelpTag` in class `ArgHandler`

### getLabel

    public java.lang.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 java.lang.String getPurpose()

  Specified by:
    `getPurpose` in class `ArgHandler`

### getPurposeSnippet

    public abstract java.lang.String getPurposeSnippet()

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

### getTag

    public final java.lang.String getTag()

  The primary tag matched by this argument handler.

  Specified by:
    `getTag` in class `ArgHandler`

### getTagArgs

    public java.lang.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 java.lang.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(java.lang.String tag)

### handle

    public int handle(java.lang.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.

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