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/jEdit/tags/jedit-4-2-pre14/bsh/BSHCastExpression.java

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Java | 70 lines | 19 code | 8 blank | 43 comment | 0 complexity | b559bf3f9e589cfc2313b7c525822430 MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, Apache-2.0, LGPL-2.0, LGPL-3.0, GPL-2.0, CC-BY-SA-3.0, LGPL-2.1, GPL-3.0, MPL-2.0-no-copyleft-exception, IPL-1.0
  1. /*****************************************************************************
  2. * *
  3. * This file is part of the BeanShell Java Scripting distribution. *
  4. * Documentation and updates may be found at http://www.beanshell.org/ *
  5. * *
  6. * Sun Public License Notice: *
  7. * *
  8. * The contents of this file are subject to the Sun Public License Version *
  9. * 1.0 (the "License"); you may not use this file except in compliance with *
  10. * the License. A copy of the License is available at http://www.sun.com *
  11. * *
  12. * The Original Code is BeanShell. The Initial Developer of the Original *
  13. * Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
  14. * (C) 2000. All Rights Reserved. *
  15. * *
  16. * GNU Public License Notice: *
  17. * *
  18. * Alternatively, the contents of this file may be used under the terms of *
  19. * the GNU Lesser General Public License (the "LGPL"), in which case the *
  20. * provisions of LGPL are applicable instead of those above. If you wish to *
  21. * allow use of your version of this file only under the terms of the LGPL *
  22. * and not to allow others to use your version of this file under the SPL, *
  23. * indicate your decision by deleting the provisions above and replace *
  24. * them with the notice and other provisions required by the LGPL. If you *
  25. * do not delete the provisions above, a recipient may use your version of *
  26. * this file under either the SPL or the LGPL. *
  27. * *
  28. * Patrick Niemeyer (pat@pat.net) *
  29. * Author of Learning Java, O'Reilly & Associates *
  30. * http://www.pat.net/~pat/ *
  31. * *
  32. *****************************************************************************/
  33. package bsh;
  34. /**
  35. Implement casts.
  36. I think it should be possible to simplify some of the code here by
  37. using the Types.getAssignableForm() method, but I haven't looked
  38. into it.
  39. */
  40. class BSHCastExpression extends SimpleNode {
  41. public BSHCastExpression(int id) { super(id); }
  42. /**
  43. @return the result of the cast.
  44. */
  45. public Object eval(
  46. CallStack callstack, Interpreter interpreter ) throws EvalError
  47. {
  48. NameSpace namespace = callstack.top();
  49. Class toType = ((BSHType)jjtGetChild(0)).getType(
  50. callstack, interpreter );
  51. SimpleNode expression = (SimpleNode)jjtGetChild(1);
  52. // evaluate the expression
  53. Object fromValue = expression.eval(callstack, interpreter);
  54. Class fromType = fromValue.getClass();
  55. try {
  56. return Types.castObject( fromValue, toType, Types.CAST );
  57. } catch ( UtilEvalError e ) {
  58. throw e.toEvalError( this, callstack );
  59. }
  60. }
  61. }