| /* |
| * @(#)$Id$ |
| * |
| * 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.util; |
| |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| import org.apache.bcel.generic.*; |
| import org.apache.xalan.xsltc.compiler.Parser; |
| import org.apache.xalan.xsltc.compiler.Constants; |
| |
| public final class VoidType extends Type { |
| protected VoidType() {} |
| |
| public String toString() { |
| return "void"; |
| } |
| |
| public boolean identicalTo(Type other) { |
| return this == other; |
| } |
| |
| public String toSignature() { |
| return "V"; |
| } |
| |
| public org.apache.bcel.generic.Type toJCType() { |
| return null; // should never be called |
| } |
| |
| /** |
| * Translates a void into an object of internal type <code>type</code>. |
| * This translation is needed when calling external functions |
| * that return void. |
| * |
| * @see org.apache.xalan.xsltc.compiler.util.Type#translateTo |
| */ |
| public void translateTo(ClassGenerator classGen, MethodGenerator methodGen, |
| Type type) { |
| if (type == Type.String) { |
| translateTo(classGen, methodGen, (StringType) type); |
| } |
| else { |
| ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR, |
| toString(), type.toString()); |
| classGen.getParser().reportError(Constants.FATAL, err); |
| } |
| } |
| |
| /** |
| * Translates a void into a string by pushing the empty string ''. |
| * |
| * @see org.apache.xalan.xsltc.compiler.util.Type#translateTo |
| */ |
| public void translateTo(ClassGenerator classGen, MethodGenerator methodGen, |
| StringType type) { |
| final InstructionList il = methodGen.getInstructionList(); |
| il.append(new PUSH(classGen.getConstantPool(), "")); |
| } |
| |
| /** |
| * Translates an external (primitive) Java type into a void. |
| * Only an external "void" can be converted to this class. |
| */ |
| public void translateFrom(ClassGenerator classGen, MethodGenerator methodGen, |
| Class clazz) { |
| if (!clazz.getName().equals("void")) { |
| ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR, |
| toString(), clazz.getName()); |
| classGen.getParser().reportError(Constants.FATAL, err); |
| } |
| } |
| } |