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Java API for XML Processing Reference Implementation
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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* 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: Type.java,v 1.11 2010-11-01 04:34:20 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler.util;
import com.sun.org.apache.bcel.internal.generic.BranchInstruction;
import com.sun.org.apache.bcel.internal.generic.Instruction;
import com.sun.org.apache.xalan.internal.xsltc.compiler.Constants;
import com.sun.org.apache.xalan.internal.xsltc.compiler.FlowList;
import com.sun.org.apache.xalan.internal.xsltc.compiler.NodeTest;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*/
public abstract class Type implements Constants {
public static final Type Int = new IntType();
public static final Type Real = new RealType();
public static final Type Boolean = new BooleanType();
public static final Type NodeSet = new NodeSetType();
public static final Type String = new StringType();
public static final Type ResultTree = new ResultTreeType();
public static final Type Reference = new ReferenceType();
public static final Type Void = new VoidType();
public static final Type Object = new ObjectType(java.lang.Object.class);
public static final Type ObjectString = new ObjectType(java.lang.String.class);
public static final Type Node = new NodeType(NodeTest.ANODE);
public static final Type Root = new NodeType(NodeTest.ROOT);
public static final Type Element = new NodeType(NodeTest.ELEMENT);
public static final Type Attribute = new NodeType(NodeTest.ATTRIBUTE);
public static final Type Text = new NodeType(NodeTest.TEXT);
public static final Type Comment = new NodeType(NodeTest.COMMENT);
public static final Type Processing_Instruction = new NodeType(NodeTest.PI);
/**
* Factory method to instantiate object types. Returns a pre-defined
* instance for "java.lang.Object" and "java.lang.String".
*/
public static Type newObjectType(String javaClassName) {
if (javaClassName == "java.lang.Object") {
return Type.Object;
}
else if (javaClassName == "java.lang.String") {
return Type.ObjectString;
}
else {
//
java.security.AccessControlContext acc = java.security.AccessController.getContext();
acc.checkPermission(new RuntimePermission("getContextClassLoader"));
return new ObjectType(javaClassName);
}
}
/**
* Factory method to instantiate object types. Returns a pre-defined
* instance for java.lang.Object.class and java.lang.String.class.
*/
public static Type newObjectType(Class clazz) {
if (clazz == java.lang.Object.class) {
return Type.Object;
}
else if (clazz == java.lang.String.class) {
return Type.ObjectString;
}
else {
return new ObjectType(clazz);
}
}
/**
* Returns a string representation of this type.
*/
public abstract String toString();
/**
* Returns true if this and other are identical types.
*/
public abstract boolean identicalTo(Type other);
/**
* Returns true if this type is a numeric type. Redefined in NumberType.
*/
public boolean isNumber() {
return false;
}
/**
* Returns true if this type has no object representaion. Redefined in
* ResultTreeType.
*/
public boolean implementedAsMethod() {
return false;
}
/**
* Returns true if this type is a simple type. Redefined in NumberType,
* BooleanType and StringType.
*/
public boolean isSimple() {
return false;
}
public abstract com.sun.org.apache.bcel.internal.generic.Type toJCType();
/**
* Returns the distance between two types. This measure is used to select
* overloaded functions/operators. This method is typically redefined by
* the subclasses.
*/
public int distanceTo(Type type) {
return type == this ? 0 : Integer.MAX_VALUE;
}
/**
* Returns the signature of an internal type's external representation.
*/
public abstract String toSignature();
/**
* Translates an object of this type to an object of type
* type.
* Expects an object of the former type and pushes an object of the latter.
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
Type type) {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
toString(), type.toString());
classGen.getParser().reportError(Constants.FATAL, err);
}
/**
* Translates object of this type to an object of type type.
* Expects an object of the former type and pushes an object of the latter
* if not boolean. If type type is boolean then a branchhandle
* list (to be appended to the false list) is returned.
*/
public FlowList translateToDesynthesized(ClassGenerator classGen,
MethodGenerator methodGen,
Type type) {
FlowList fl = null;
if (type == Type.Boolean) {
fl = translateToDesynthesized(classGen, methodGen,
(BooleanType)type);
}
else {
translateTo(classGen, methodGen, type);
}
return fl;
}
/**
* Translates an object of this type to an non-synthesized boolean. It
* does not push a 0 or a 1 but instead returns branchhandle list to be
* appended to the false list.
*/
public FlowList translateToDesynthesized(ClassGenerator classGen,
MethodGenerator methodGen,
BooleanType type) {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
toString(), type.toString());
classGen.getParser().reportError(Constants.FATAL, err);
return null;
}
/**
* Translates an object of this type to the external (Java) type denoted
* by clazz. This method is used to translate parameters
* when external functions are called.
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
Class clazz) {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
toString(), clazz.getClass().toString());
classGen.getParser().reportError(Constants.FATAL, err);
}
/**
* Translates an external (Java) type denoted by clazz to
* an object of this type. This method is used to translate return values
* when external functions are called.
*/
public void translateFrom(ClassGenerator classGen, MethodGenerator methodGen,
Class clazz) {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
clazz.getClass().toString(), toString());
classGen.getParser().reportError(Constants.FATAL, err);
}
/**
* Translates an object of this type to its boxed representation.
*/
public void translateBox(ClassGenerator classGen,
MethodGenerator methodGen) {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
toString(), "["+toString()+"]");
classGen.getParser().reportError(Constants.FATAL, err);
}
/**
* Translates an object of this type to its unboxed representation.
*/
public void translateUnBox(ClassGenerator classGen,
MethodGenerator methodGen) {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
"["+toString()+"]", toString());
classGen.getParser().reportError(Constants.FATAL, err);
}
/**
* Returns the class name of an internal type's external representation.
*/
public String getClassName() {
return(EMPTYSTRING);
}
public Instruction ADD() {
return null; // should never be called
}
public Instruction SUB() {
return null; // should never be called
}
public Instruction MUL() {
return null; // should never be called
}
public Instruction DIV() {
return null; // should never be called
}
public Instruction REM() {
return null; // should never be called
}
public Instruction NEG() {
return null; // should never be called
}
public Instruction LOAD(int slot) {
return null; // should never be called
}
public Instruction STORE(int slot) {
return null; // should never be called
}
public Instruction POP() {
return POP;
}
public BranchInstruction GT(boolean tozero) {
return null; // should never be called
}
public BranchInstruction GE(boolean tozero) {
return null; // should never be called
}
public BranchInstruction LT(boolean tozero) {
return null; // should never be called
}
public BranchInstruction LE(boolean tozero) {
return null; // should never be called
}
public Instruction CMP(boolean less) {
return null; // should never be called
}
public Instruction DUP() {
return DUP; // default
}
}