/interpreter/tags/at2dist030708/src/edu/vub/at/objects/symbiosis/JavaMethod.java

http://ambienttalk.googlecode.com/ · Java · 145 lines · 82 code · 18 blank · 45 comment · 7 complexity · ff6c0a177845165c9914e2bd057326fe MD5 · raw file

  1. /**
  2. * AmbientTalk/2 Project
  3. * JavaMethod.java created on 5-nov-2006 at 20:08:39
  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.symbiosis;
  29. import edu.vub.at.eval.Evaluator;
  30. import edu.vub.at.exceptions.InterpreterException;
  31. import edu.vub.at.exceptions.XTypeMismatch;
  32. import edu.vub.at.objects.ATBoolean;
  33. import edu.vub.at.objects.ATClosure;
  34. import edu.vub.at.objects.ATContext;
  35. import edu.vub.at.objects.ATMethod;
  36. import edu.vub.at.objects.ATObject;
  37. import edu.vub.at.objects.ATTable;
  38. import edu.vub.at.objects.coercion.NativeTypeTags;
  39. import edu.vub.at.objects.grammar.ATBegin;
  40. import edu.vub.at.objects.grammar.ATSymbol;
  41. import edu.vub.at.objects.mirrors.Reflection;
  42. import edu.vub.at.objects.natives.NATBoolean;
  43. import edu.vub.at.objects.natives.NATByRef;
  44. import edu.vub.at.objects.natives.NATTable;
  45. import edu.vub.at.objects.natives.NATText;
  46. import edu.vub.at.objects.natives.grammar.AGBegin;
  47. import java.lang.reflect.Method;
  48. /**
  49. * JavaMethod is a wrapper class encapsulating one or more java.lang.reflect.Method objects.
  50. * The receiver is to be supplied during method application.
  51. *
  52. * All methods in the choices array should be overloaded versions of the same method
  53. * (i.e. they should have the same selector). The choices array should never be empty!
  54. *
  55. * JavaMethod objects must be constant, they are globally cached for all actors to use.
  56. *
  57. * @author tvcutsem
  58. */
  59. public final class JavaMethod extends NATByRef implements ATMethod {
  60. protected final Method[] choices_;
  61. public JavaMethod(Method[] choices) {
  62. // assertion
  63. if (choices.length == 0) { throw new RuntimeException("assertion failed"); }
  64. choices_ = choices;
  65. }
  66. public ATObject base_apply(ATTable arguments, ATContext ctx) throws InterpreterException {
  67. ATObject wrapper = ctx.base_receiver();
  68. Object receiver;
  69. if (wrapper.isJavaObjectUnderSymbiosis()) {
  70. receiver = wrapper.asJavaObjectUnderSymbiosis().getWrappedObject();
  71. } else {
  72. // static invocations do not require a receiver
  73. receiver = null;
  74. }
  75. return Symbiosis.symbioticInvocation(wrapper, receiver, choices_[0].getName(), this, arguments.asNativeTable().elements_);
  76. }
  77. public ATObject base_applyInScope(ATTable arguments, ATContext ctx) throws InterpreterException {
  78. return base_apply(arguments, ctx);
  79. }
  80. public ATBegin base_bodyExpression() throws InterpreterException {
  81. // list all of the method signatures of the (possibly overloaded) Java method
  82. StringBuffer buff = new StringBuffer("Java implementation of: ");
  83. for (int i = 0; i < choices_.length; i++) {
  84. buff.append("\n");
  85. buff.append(choices_[i].toString());
  86. }
  87. buff.append("\n");
  88. return new AGBegin(NATTable.atValue(new ATObject[] { NATText.atValue(buff.toString()) }));
  89. }
  90. public ATSymbol base_name() throws InterpreterException {
  91. return Reflection.downSelector(choices_[0].getName());
  92. }
  93. public ATTable base_parameters() throws InterpreterException {
  94. return Evaluator._ANON_MTH_ARGS_;
  95. }
  96. public ATTable base_annotations() throws InterpreterException {
  97. return NATTable.EMPTY;
  98. }
  99. public NATText meta_print() throws InterpreterException {
  100. return NATText.atValue("<java method:"+choices_[0].getName()+">");
  101. }
  102. public ATTable meta_typeTags() throws InterpreterException {
  103. return NATTable.of(NativeTypeTags._METHOD_);
  104. }
  105. public ATMethod asMethod() throws XTypeMismatch {
  106. return this;
  107. }
  108. public boolean isJavaMethodUnderSymbiosis() { return true; }
  109. public JavaMethod asJavaMethodUnderSymbiosis() { return this; }
  110. /**
  111. * Two JavaMethod instances are equal if they both represent a set of methods
  112. * from the same declaring class with the same selector.
  113. */
  114. public ATBoolean base__opeql__opeql_(ATObject comparand) throws InterpreterException {
  115. if (comparand.isJavaMethodUnderSymbiosis()) {
  116. JavaMethod mth = comparand.asJavaMethodUnderSymbiosis();
  117. return NATBoolean.atValue(
  118. (mth.choices_[0].getDeclaringClass().equals(choices_[0].getDeclaringClass())) &&
  119. mth.choices_[0].getName().equals(choices_[0].getName()));
  120. } else {
  121. return NATBoolean._FALSE_;
  122. }
  123. }
  124. public ATClosure base_wrap(ATObject lexicalScope, ATObject dynamicReceiver) {
  125. return new JavaClosure(lexicalScope, this);
  126. }
  127. }