1. /*
  2. * Copyright 2001-2004 The Apache Software Foundation.
  3. *
  4. * Licensed under the Apache License, Version 2.0 (the "License");
  5. * you may not use this file except in compliance with the License.
  6. * You may obtain a copy of the License at
  7. *
  8. * http://www.apache.org/licenses/LICENSE-2.0
  9. *
  10. * Unless required by applicable law or agreed to in writing, software
  11. * distributed under the License is distributed on an "AS IS" BASIS,
  12. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13. * See the License for the specific language governing permissions and
  14. * limitations under the License.
  15. */
  16. /*
  17. * $Id: LiteralExpr.java,v 1.8 2004/02/16 22:24:29 minchau Exp $
  18. */
  19. package com.sun.org.apache.xalan.internal.xsltc.compiler;
  20. import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  21. import com.sun.org.apache.bcel.internal.generic.InstructionList;
  22. import com.sun.org.apache.bcel.internal.generic.PUSH;
  23. import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
  24. import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
  25. import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
  26. import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
  27. /**
  28. * @author Jacek Ambroziak
  29. * @author Santiago Pericas-Geertsen
  30. */
  31. final class LiteralExpr extends Expression {
  32. private final String _value;
  33. private final String _namespace;
  34. /**
  35. * Creates a new literal expression node.
  36. * @param value the literal expression content/value.
  37. */
  38. public LiteralExpr(String value) {
  39. _value = value;
  40. _namespace = null;
  41. }
  42. /**
  43. * Creates a new literal expression node.
  44. * @param value the literal expression content/value.
  45. * @param namespace the namespace in which the expression exists.
  46. */
  47. public LiteralExpr(String value, String namespace) {
  48. _value = value;
  49. _namespace = namespace.equals(Constants.EMPTYSTRING) ? null : namespace;
  50. }
  51. public Type typeCheck(SymbolTable stable) throws TypeCheckError {
  52. return _type = Type.String;
  53. }
  54. public String toString() {
  55. return "literal-expr(" + _value + ')';
  56. }
  57. protected boolean contextDependent() {
  58. return false;
  59. }
  60. protected String getValue() {
  61. return _value;
  62. }
  63. protected String getNamespace() {
  64. return _namespace;
  65. }
  66. public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
  67. final ConstantPoolGen cpg = classGen.getConstantPool();
  68. final InstructionList il = methodGen.getInstructionList();
  69. il.append(new PUSH(cpg, _value));
  70. }
  71. }