1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 */ 4 /* 5 * Licensed to the Apache Software Foundation (ASF) under one or more 6 * contributor license agreements. See the NOTICE file distributed with 7 * this work for additional information regarding copyright ownership. 8 * The ASF licenses this file to You under the Apache License, Version 2.0 9 * (the "License"); you may not use this file except in compliance with 10 * the License. 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 package com.sun.org.apache.xalan.internal.xsltc.compiler; 22 23 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; 24 import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL; 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.ErrorMsg; 28 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; 29 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; 30 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; 31 import java.util.List; 32 33 /** 34 * @author Jacek Ambroziak 35 * @author Santiago Pericas-Geertsen 36 * @author Morten Jorgensen 37 * @LastModified: Oct 2017 38 */ 39 final class StartsWithCall extends FunctionCall { 40 41 private Expression _base = null; 42 private Expression _token = null; 43 44 /** 45 * Create a starts-with() call - two arguments, both strings 46 */ 47 public StartsWithCall(QName fname, List<Expression> arguments) { 48 super(fname, arguments); 49 } 50 51 /** 52 * Type check the two parameters for this function 53 */ 54 public Type typeCheck(SymbolTable stable) throws TypeCheckError { 55 56 // Check that the function was passed exactly two arguments 57 if (argumentCount() != 2) { 58 ErrorMsg err = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, 59 getName(), this); 60 throw new TypeCheckError(err); 61 } 62 63 // The first argument must be a String, or cast to a String 64 _base = argument(0); 65 Type baseType = _base.typeCheck(stable); 66 if (baseType != Type.String) 67 _base = new CastExpr(_base, Type.String); 68 69 // The second argument must also be a String, or cast to a String 70 _token = argument(1); 71 Type tokenType = _token.typeCheck(stable); 72 if (tokenType != Type.String) 73 _token = new CastExpr(_token, Type.String); 74 75 return _type = Type.Boolean; 76 } 77 78 /** 79 * Compile the expression - leave boolean expression on stack 80 */ 81 public void translate(ClassGenerator classGen, MethodGenerator methodGen) { 82 final ConstantPoolGen cpg = classGen.getConstantPool(); 83 final InstructionList il = methodGen.getInstructionList(); 84 _base.translate(classGen, methodGen); 85 _token.translate(classGen, methodGen); 86 il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS, 87 "startsWith", 88 "("+STRING_SIG+")Z"))); 89 } 90 }