1 /* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5 /* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22 package com.sun.org.apache.xalan.internal.xsltc.compiler; 23 24 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; 25 import com.sun.org.apache.bcel.internal.generic.InstructionList; 26 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; 27 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; 28 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; 29 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; 30 31 /** 32 * @author Morten Jorgensen 33 */ 34 final class Fallback extends Instruction { 35 36 private boolean _active = false; 37 38 /** 39 * This element never produces any data on the stack 40 */ typeCheck(SymbolTable stable)41 public Type typeCheck(SymbolTable stable) throws TypeCheckError { 42 if (_active) { 43 return(typeCheckContents(stable)); 44 } 45 else { 46 return Type.Void; 47 } 48 } 49 50 /** 51 * Activate this fallback element 52 */ activate()53 public void activate() { 54 _active = true; 55 } 56 toString()57 public String toString() { 58 return("fallback"); 59 } 60 61 /** 62 * Parse contents only if this fallback element is put in place of 63 * some unsupported element or non-XSLTC extension element 64 */ parseContents(Parser parser)65 public void parseContents(Parser parser) { 66 if (_active) parseChildren(parser); 67 } 68 69 /** 70 * Translate contents only if this fallback element is put in place of 71 * some unsupported element or non-XSLTC extension element 72 */ translate(ClassGenerator classGen, MethodGenerator methodGen)73 public void translate(ClassGenerator classGen, MethodGenerator methodGen) { 74 final ConstantPoolGen cpg = classGen.getConstantPool(); 75 final InstructionList il = methodGen.getInstructionList(); 76 77 if (_active) translateContents(classGen, methodGen); 78 } 79 } 80