src/org/apache/xalan/xsltc/compiler/ConcatCall.java

/*
 * @(#)$Id$
 *
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, Sun
 * Microsystems., http://www.sun.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 *
 */

package org.apache.xalan.xsltc.compiler;

import java.util.Vector;
import java.util.Enumeration;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.bcel.generic.Instruction;
import org.apache.bcel.generic.*;
import org.apache.xalan.xsltc.compiler.util.*;

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));
	}
    }
}