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: StartsWithCall.java,v 1.2.4.1 2005/09/05 09:05:28 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.INVOKEVIRTUAL; 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.ErrorMsg; 33 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; 34 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; 35 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; 36 37 /** 38 * @author Jacek Ambroziak 39 * @author Santiago Pericas-Geertsen 40 * @author Morten Jorgensen 41 */ 42 final class StartsWithCall extends FunctionCall { 43 44 private Expression _base = null; 45 private Expression _token = null; 46 47 /** 48 * Create a starts-with() call - two arguments, both strings 49 */ 50 public StartsWithCall(QName fname, Vector arguments) { 51 super(fname, arguments); 52 } 53 54 /** 55 * Type check the two parameters for this function 56 */ 57 public Type typeCheck(SymbolTable stable) throws TypeCheckError { 58 59 // Check that the function was passed exactly two arguments 60 if (argumentCount() != 2) { 61 ErrorMsg err = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, 62 getName(), this); 63 throw new TypeCheckError(err); 64 } 65 66 // The first argument must be a String, or cast to a String 67 _base = argument(0); 68 Type baseType = _base.typeCheck(stable); 69 if (baseType != Type.String) 70 _base = new CastExpr(_base, Type.String); 71 72 // The second argument must also be a String, or cast to a String 73 _token = argument(1); 74 Type tokenType = _token.typeCheck(stable); 75 if (tokenType != Type.String) 76 _token = new CastExpr(_token, Type.String); 77 78 return _type = Type.Boolean; 79 } 80 81 /** 82 * Compile the expression - leave boolean expression on stack 83 */ 84 public void translate(ClassGenerator classGen, MethodGenerator methodGen) { 85 final ConstantPoolGen cpg = classGen.getConstantPool(); 86 final InstructionList il = methodGen.getInstructionList(); 87 _base.translate(classGen, methodGen); 88 _token.translate(classGen, methodGen); 89 il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS, 90 "startsWith", 91 "("+STRING_SIG+")Z"))); 92 } 93 }