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: Fallback.java,v 1.2.4.1 2005/09/01 14:22:25 pvedula Exp $ 22 */ 23 24 package com.sun.org.apache.xalan.internal.xsltc.compiler; 25 26 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; 27 import com.sun.org.apache.bcel.internal.generic.InstructionList; 28 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; 29 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; 30 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; 31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; 32 33 /** 34 * @author Morten Jorgensen 35 */ 36 final class Fallback extends Instruction { 37 38 private boolean _active = false; 39 40 /** 41 * This element never produces any data on the stack 42 */ typeCheck(SymbolTable stable)43 public Type typeCheck(SymbolTable stable) throws TypeCheckError { 44 if (_active) { 45 return(typeCheckContents(stable)); 46 } 47 else { 48 return Type.Void; 49 } 50 } 51 52 /** 53 * Activate this fallback element 54 */ activate()55 public void activate() { 56 _active = true; 57 } 58 toString()59 public String toString() { 60 return("fallback"); 61 } 62 63 /** 64 * Parse contents only if this fallback element is put in place of 65 * some unsupported element or non-XSLTC extension element 66 */ parseContents(Parser parser)67 public void parseContents(Parser parser) { 68 if (_active) parseChildren(parser); 69 } 70 71 /** 72 * Translate contents only if this fallback element is put in place of 73 * some unsupported element or non-XSLTC extension element 74 */ translate(ClassGenerator classGen, MethodGenerator methodGen)75 public void translate(ClassGenerator classGen, MethodGenerator methodGen) { 76 final ConstantPoolGen cpg = classGen.getConstantPool(); 77 final InstructionList il = methodGen.getInstructionList(); 78 79 if (_active) translateContents(classGen, methodGen); 80 } 81 } 82