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## org.eclipse.debug.core
Interface IExpressionListener

public interface IExpressionListener

An expression listener is notified of expression additions, removals, and changes. Listeners register and deregister with the expression manager.

Clients may implement this interface.

Since:
  2.0
See Also:
  `IExpressionManager`

Method Summary
`void` | `expressionAdded(IExpression expression)` Notifies this listener that the given expression has been added to the expression manager.
`void` | `expressionChanged(IExpression expression)` Notifies this listener that the given expression has changed.
`void` | `expressionRemoved(IExpression expression)` Notifies this listener that the given expression has been removed from the expression manager.

Method Detail

### expressionAdded

    public void expressionAdded(IExpression expression)

  Notifies this listener that the given expression has been added to the expression manager.

  Parameters:
    `expression` - the added expression

### expressionRemoved

    public void expressionRemoved(IExpression expression)

  Notifies this listener that the given expression has been removed from the expression manager.

  Parameters:
    `expression` - the removed expression

### expressionChanged

    public void expressionChanged(IExpression expression)

  Notifies this listener that the given expression has changed.

  Parameters:
    `expression` - the changed expression

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