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## org.netbeans.spi.queries
Interface VisibilityQueryImplementation

    public interface VisibilityQueryImplementation

Determine whether files should be hidden in views presented to the user.

Global lookup is used to find all instances of VisibilityQueryImplementation.

Threading note: implementors should avoid acquiring locks that might be held by other threads. Generally treat this interface similarly to SPIs in `org.openide.filesystems` with respect to threading semantics.

See Also:
  `VisibilityQuery`

Method Summary
`void` | `addChangeListener(ChangeListener l)` Add a listener to changes.
`boolean` | `isVisible(FileObject file)` Check whether a file is recommended to be visible.
`void` | `removeChangeListener(ChangeListener l)` Stop listening to changes.

Method Detail

### isVisible

    boolean isVisible(FileObject file)

  Check whether a file is recommended to be visible.

  Parameters:
    `file` - a file to considered
  Returns:
    true if it is recommended to display this file

### addChangeListener

    void addChangeListener(ChangeListener l)

  Add a listener to changes.

  Parameters:
    `l` - a listener to add

### removeChangeListener

    void removeChangeListener(ChangeListener l)

  Stop listening to changes.

  Parameters:
    `l` - a listener to remove

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Built on December 7 2006. | Portions Copyright 1997-2005 Sun Microsystems, Inc. All rights reserved.