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/*
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* reserved comment block
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* DO NOT REMOVE OR ALTER!
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*/
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/*
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* Copyright 2001-2004 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* $Id: ConcatCall.java,v 1.2.4.1 2005/09/01 12:07:31 pvedula Exp $
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*/
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package com.sun.org.apache.xalan.internal.xsltc.compiler;
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import java.util.Vector;
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import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
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import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
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import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
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import com.sun.org.apache.bcel.internal.generic.Instruction;
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import com.sun.org.apache.bcel.internal.generic.InstructionList;
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import com.sun.org.apache.bcel.internal.generic.NEW;
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import com.sun.org.apache.bcel.internal.generic.PUSH;
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import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
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import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
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import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
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import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
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/**
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* @author Jacek Ambroziak
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* @author Santiago Pericas-Geertsen
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*/
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final class ConcatCall extends FunctionCall {
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public ConcatCall(QName fname, Vector arguments) {
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super(fname, arguments);
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}
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public Type typeCheck(SymbolTable stable) throws TypeCheckError {
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for (int i = 0; i < argumentCount(); i++) {
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final Expression exp = argument(i);
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if (!exp.typeCheck(stable).identicalTo(Type.String)) {
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setArgument(i, new CastExpr(exp, Type.String));
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}
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}
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return _type = Type.String;
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}
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/** translate leaves a String on the stack */
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public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
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final ConstantPoolGen cpg = classGen.getConstantPool();
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final InstructionList il = methodGen.getInstructionList();
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final int nArgs = argumentCount();
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switch (nArgs) {
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case 0:
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il.append(new PUSH(cpg, EMPTYSTRING));
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break;
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case 1:
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argument().translate(classGen, methodGen);
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break;
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default:
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final int initBuffer = cpg.addMethodref(STRING_BUFFER_CLASS,
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"<init>", "()V");
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final Instruction append =
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new INVOKEVIRTUAL(cpg.addMethodref(STRING_BUFFER_CLASS,
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"append",
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"("+STRING_SIG+")"
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+STRING_BUFFER_SIG));
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final int toString = cpg.addMethodref(STRING_BUFFER_CLASS,
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"toString",
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"()"+STRING_SIG);
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il.append(new NEW(cpg.addClass(STRING_BUFFER_CLASS)));
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il.append(DUP);
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il.append(new INVOKESPECIAL(initBuffer));
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for (int i = 0; i < nArgs; i++) {
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argument(i).translate(classGen, methodGen);
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il.append(append);
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}
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il.append(new INVOKEVIRTUAL(toString));
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}
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}
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}
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