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## org.eclipse.ui.dialogs
Interface ISelectionValidator

All Known Implementing Classes:
  CopyResourceAction

public interface ISelectionValidator

For validating selections in some selection dialogs.

Clients should implement this interface to define specialized selection validators.

Method Summary
`String` | `isValid(Object selection)` Returns a string indicating whether the given selection is valid.

Method Detail

### isValid

    public String isValid(Object selection)

  Returns a string indicating whether the given selection is valid. If the result is `null`, the selection is considered to be valid; if the result is non-empty, it contains the error message to be displayed to the user.

  Parameters:
    `selection` - the selection to be validated
  Returns:
    the error message, or `null` indicating that the value is valid

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