| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| /* |
| * $Id$ |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import java.util.Vector; |
| |
| import org.apache.bcel.generic.ConstantPoolGen; |
| import org.apache.bcel.generic.INVOKESPECIAL; |
| import org.apache.bcel.generic.INVOKEVIRTUAL; |
| import org.apache.bcel.generic.Instruction; |
| import org.apache.bcel.generic.InstructionList; |
| import org.apache.bcel.generic.NEW; |
| import org.apache.bcel.generic.PUSH; |
| import org.apache.xalan.xsltc.compiler.util.ClassGenerator; |
| import org.apache.xalan.xsltc.compiler.util.MethodGenerator; |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| import org.apache.xalan.xsltc.compiler.util.TypeCheckError; |
| |
| /** |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| */ |
| final class ConcatCall extends FunctionCall { |
| public ConcatCall(QName fname, Vector arguments) { |
| super(fname, arguments); |
| } |
| |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| for (int i = 0; i < argumentCount(); i++) { |
| final Expression exp = argument(i); |
| if (!exp.typeCheck(stable).identicalTo(Type.String)) { |
| setArgument(i, new CastExpr(exp, Type.String)); |
| } |
| } |
| return _type = Type.String; |
| } |
| |
| /** translate leaves a String on the stack */ |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| final int nArgs = argumentCount(); |
| |
| switch (nArgs) { |
| case 0: |
| il.append(new PUSH(cpg, EMPTYSTRING)); |
| break; |
| |
| case 1: |
| argument().translate(classGen, methodGen); |
| break; |
| |
| default: |
| final int initBuffer = cpg.addMethodref(STRING_BUFFER_CLASS, |
| "<init>", "()V"); |
| final Instruction append = |
| new INVOKEVIRTUAL(cpg.addMethodref(STRING_BUFFER_CLASS, |
| "append", |
| "("+STRING_SIG+")" |
| +STRING_BUFFER_SIG)); |
| |
| final int toString = cpg.addMethodref(STRING_BUFFER_CLASS, |
| "toString", |
| "()"+STRING_SIG); |
| |
| il.append(new NEW(cpg.addClass(STRING_BUFFER_CLASS))); |
| il.append(DUP); |
| il.append(new INVOKESPECIAL(initBuffer)); |
| for (int i = 0; i < nArgs; i++) { |
| argument(i).translate(classGen, methodGen); |
| il.append(append); |
| } |
| il.append(new INVOKEVIRTUAL(toString)); |
| } |
| } |
| } |