1 /* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5 /* 6 * Copyright 2001-2004 The Apache Software Foundation. 7 * 8 * Licensed under the Apache License, Version 2.0 (the "License"); 9 * you may not use this file except in compliance with the License. 10 * You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 /* 21 * $Id: NameBase.java,v 1.2.4.1 2005/09/02 10:17:31 pvedula Exp $ 22 */ 23 24 package com.sun.org.apache.xalan.internal.xsltc.compiler; 25 26 import java.util.Vector; 27 28 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; 29 import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC; 30 import com.sun.org.apache.bcel.internal.generic.InstructionList; 31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; 32 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; 33 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; 34 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; 35 36 /** 37 * @author Morten Jorgensen 38 * @author Erwin Bolwidt <ejb@klomp.org> 39 */ 40 class NameBase extends FunctionCall { 41 42 private Expression _param = null; 43 private Type _paramType = Type.Node; 44 45 /** 46 * Handles calls with no parameter (current node is implicit parameter). 47 */ NameBase(QName fname)48 public NameBase(QName fname) { 49 super(fname); 50 } 51 52 /** 53 * Handles calls with one parameter (either node or node-set). 54 */ NameBase(QName fname, Vector arguments)55 public NameBase(QName fname, Vector arguments) { 56 super(fname, arguments); 57 _param = argument(0); 58 } 59 60 61 /** 62 * Check that we either have no parameters or one parameter that is 63 * either a node or a node-set. 64 */ typeCheck(SymbolTable stable)65 public Type typeCheck(SymbolTable stable) throws TypeCheckError { 66 67 // Check the argument type (if any) 68 switch(argumentCount()) { 69 case 0: 70 _paramType = Type.Node; 71 break; 72 case 1: 73 _paramType = _param.typeCheck(stable); 74 break; 75 default: 76 throw new TypeCheckError(this); 77 } 78 79 // The argument has to be a node, a node-set or a node reference 80 if ((_paramType != Type.NodeSet) && 81 (_paramType != Type.Node) && 82 (_paramType != Type.Reference)) { 83 throw new TypeCheckError(this); 84 } 85 86 return (_type = Type.String); 87 } 88 getType()89 public Type getType() { 90 return _type; 91 } 92 93 /** 94 * Translate the code required for getting the node for which the 95 * QName, local-name or namespace URI should be extracted. 96 */ translate(ClassGenerator classGen, MethodGenerator methodGen)97 public void translate(ClassGenerator classGen, 98 MethodGenerator methodGen) { 99 final ConstantPoolGen cpg = classGen.getConstantPool(); 100 final InstructionList il = methodGen.getInstructionList(); 101 102 il.append(methodGen.loadDOM()); 103 104 // Function was called with no parameters 105 if (argumentCount() == 0) { 106 il.append(methodGen.loadContextNode()); 107 } 108 // Function was called with node parameter 109 else if (_paramType == Type.Node) { 110 _param.translate(classGen, methodGen); 111 } 112 else if (_paramType == Type.Reference) { 113 _param.translate(classGen, methodGen); 114 il.append(new INVOKESTATIC(cpg.addMethodref 115 (BASIS_LIBRARY_CLASS, 116 "referenceToNodeSet", 117 "(" 118 + OBJECT_SIG 119 + ")" 120 + NODE_ITERATOR_SIG))); 121 il.append(methodGen.nextNode()); 122 } 123 // Function was called with node-set parameter 124 else { 125 _param.translate(classGen, methodGen); 126 _param.startIterator(classGen, methodGen); 127 il.append(methodGen.nextNode()); 128 } 129 } 130 } 131