- /*
- * Copyright 2001-2004 The Apache Software Foundation.
- *
- * Licensed 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: VoidType.java,v 1.7 2004/02/16 22:26:44 minchau Exp $
- */
-
- package com.sun.org.apache.xalan.internal.xsltc.compiler.util;
-
- import com.sun.org.apache.bcel.internal.generic.Instruction;
- import com.sun.org.apache.bcel.internal.generic.InstructionList;
- import com.sun.org.apache.bcel.internal.generic.PUSH;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.Constants;
-
- /**
- * @author Jacek Ambroziak
- * @author Santiago Pericas-Geertsen
- */
- 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 com.sun.org.apache.bcel.internal.generic.Type toJCType() {
- return null; // should never be called
- }
-
- public Instruction POP() {
- return NOP;
- }
-
- /**
- * Translates a void into an object of internal type <code>type</code>.
- * This translation is needed when calling external functions
- * that return void.
- *
- * @see com.sun.org.apache.xalan.internal.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 com.sun.org.apache.xalan.internal.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);
- }
- }
- }