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## org.biojava.utils
Class Unchangeable

    java.lang.Object
      org.biojava.utils.Unchangeable

All Implemented Interfaces:
  Changeable

Direct Known Subclasses:
  AlternateTokenization, BioFetchSequenceDB, CharacterTokenization, DASSequenceDB, DoubleAlphabet, DoubleAlphabet.DoubleRange, DoubleAlphabet.DoubleSymbol, DoubleAlphabet.SubDoubleAlphabet, EmptyRichAnnotation, EmptyRichLocation, FeatureHolder.EmptyFeatureHolder, FlatSequenceDB, GapDistribution, IntegerAlphabet, IntegerAlphabet.IntegerSymbol, IntegerOntology, IntegerOntology.IntTerm, RelabeledAlignment, SimilarityPairFeature.EmptyPairwiseAlignment, SimpleCrossRef, SimpleDocRefAuthor, SimpleStatePath, SoftMaskedAlphabet, SoftMaskedAlphabet.CaseSensitiveTokenization, Triple.Impl, ViewSequence, WordTokenization

    public class Unchangeable

extends Object
implements Changeable

This is a utility implementation of Changeable that doesn't fire any events or keep references to any listeners. Use this when you have a final immutable class and can't be bothered to fill in all those method stubs.

Since:
  1.3
Author:
  Matthew Pocock

Constructor Summary
`Unchangeable()`

Method Summary
`void` | `addChangeListener(ChangeListener cl)` Add a listener that will be informed of all changes.
`void` | `addChangeListener(ChangeListener cl, ChangeType ct)` Add a listener that will be informed of changes of a given type.
`void` | `addForwarder(ChangeForwarder cf, ChangeType ct)`
`Set` | `getForwarders(ChangeType ct)`
`Set` | `getListeners(ChangeType ct)`
`boolean` | `isUnchanging(ChangeType ct)` A particular ChangeType can never be raised by this Changeable.
`void` | `removeChangeListener(ChangeListener cl)` Remove a listener that was interested in all types of changes.
`void` | `removeChangeListener(ChangeListener cl, ChangeType ct)` Remove a listener that was interested in a specific types of changes.
`void` | `removeForwarder(ChangeForwarder cf, ChangeType ct)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Unchangeable

    public Unchangeable()

Method Detail

### addChangeListener

    public final void addChangeListener(ChangeListener cl)

  Description copied from interface: `Changeable`
  Add a listener that will be informed of all changes.

  Specified by:
    `addChangeListener` in interface `Changeable`
  Parameters:
    `cl` - the ChangeListener to add

### addChangeListener

    public final void addChangeListener(ChangeListener cl,
                                        ChangeType ct)

  Description copied from interface: `Changeable`
  Add a listener that will be informed of changes of a given type.

  Specified by:
    `addChangeListener` in interface `Changeable`
  Parameters:
    `cl` - the ChangeListener
    `ct` - the ChangeType it is to be informed of

### getListeners

    public final Set getListeners(ChangeType ct)

### removeChangeListener

    public final void removeChangeListener(ChangeListener cl)

  Description copied from interface: `Changeable`
  Remove a listener that was interested in all types of changes.

  Specified by:
    `removeChangeListener` in interface `Changeable`
  Parameters:
    `cl` - a ChangeListener to remove

### removeChangeListener

    public final void removeChangeListener(ChangeListener cl,
                                           ChangeType ct)

  Description copied from interface: `Changeable`
  Remove a listener that was interested in a specific types of changes.

  Specified by:
    `removeChangeListener` in interface `Changeable`
  Parameters:
    `cl` - a ChangeListener to remove
    `ct` - the ChangeType that it was interested in

### addForwarder

    public final void addForwarder(ChangeForwarder cf,
                                   ChangeType ct)

### removeForwarder

    public final void removeForwarder(ChangeForwarder cf,
                                      ChangeType ct)

### getForwarders

    public final Set getForwarders(ChangeType ct)

### isUnchanging

    public final boolean isUnchanging(ChangeType ct)

  Description copied from interface: `Changeable`

  A particular ChangeType can never be raised by this Changeable.

  If this returns true, then it is guaranteed that change events of this type (and all child types) can never under any circumstances be fired by this Changeable instance. If it returns false, that does not mean that this type of event will or even can be raised, but that it is worth registering listeners incase.

  Specified by:
    `isUnchanging` in interface `Changeable`
  Parameters:
    `ct` - the ChangeType to check
  Returns:
    true if ChangeEvents of this type are guaranteed to never be fired

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