/interpreter/tags/at_build150307/src/edu/vub/at/objects/ATHandler.java

http://ambienttalk.googlecode.com/ · Java · 63 lines · 6 code · 4 blank · 53 comment · 0 complexity · 86b7bd45d320365b366414256439bf6e MD5 · raw file

  1. /**
  2. * AmbientTalk/2 Project
  3. * ATHandler.java created on Sep 26, 2006 at 7:56:45 PM
  4. * (c) Programming Technology Lab, 2006 - 2007
  5. * Authors: Tom Van Cutsem & Stijn Mostinckx
  6. *
  7. * Permission is hereby granted, free of charge, to any person
  8. * obtaining a copy of this software and associated documentation
  9. * files (the "Software"), to deal in the Software without
  10. * restriction, including without limitation the rights to use,
  11. * copy, modify, merge, publish, distribute, sublicense, and/or
  12. * sell copies of the Software, and to permit persons to whom the
  13. * Software is furnished to do so, subject to the following
  14. * conditions:
  15. *
  16. * The above copyright notice and this permission notice shall be
  17. * included in all copies or substantial portions of the Software.
  18. *
  19. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20. * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  21. * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22. * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  23. * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  24. * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  25. * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  26. * OTHER DEALINGS IN THE SOFTWARE.
  27. */
  28. package edu.vub.at.objects;
  29. import edu.vub.at.exceptions.InterpreterException;
  30. /**
  31. * Instances of the class ATHandler represent first-class exception handlers which
  32. * have a filter object, describing the kind of exceptions caught by the handler and
  33. * a code block which acts as replacement code for the code that raised the exception.
  34. *
  35. * @author smostinc
  36. */
  37. public interface ATHandler extends ATObject {
  38. /**
  39. * Used to determine whether a handler will be triggered when an exception is raised.
  40. * Its primary use is to provide a hook to deviate from the default semantics, which is:
  41. *
  42. * def canHandle(anException) {
  43. * (reflect: anException).isCloneOf(filter);
  44. * };
  45. *
  46. */
  47. public ATBoolean base_canHandle(ATObject anException) throws InterpreterException;
  48. /**
  49. * When a handler has answered that it can handle an exception, the following
  50. * method is invoked, asking the handler to handle the exception.
  51. * The default semantics is simply to invoke the associated handler closure.
  52. *
  53. * def handle(anException) {
  54. * handler(anException)
  55. * };
  56. *
  57. */
  58. public ATObject base_handle(ATObject anException) throws InterpreterException;
  59. }