| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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: Type.java,v 1.8 2007/03/28 16:51:19 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 |
| * <code>type</code>. |
| * 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 <code>type</code>. |
| * Expects an object of the former type and pushes an object of the latter |
| * if not boolean. If type <code>type</code> 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 <code>clazz</code>. 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 <code>clazz</code> 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 |
| } |
| } |