ArrayType.java Source File

00001 package edu.ksu.cis.bandera.jjjc.symboltable;
00002 
00003 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
00004  * Bandera, a Java(TM) analysis and transformation toolkit           *
00005  * Copyright (C) 1999, 2000   Robby (robby@cis.ksu.edu)              *
00006  * All rights reserved.                                              *
00007  *                                                                   *
00008  * This work was done as a project in the SAnToS Laboratory,         *
00009  * Department of Computing and Information Sciences, Kansas State    *
00010  * University, USA (http://www.cis.ksu.edu/santos).                  *
00011  * It is understood that any modification not identified as such is  *
00012  * not covered by the preceding statement.                           *
00013  *                                                                   *
00014  * This work is free software; you can redistribute it and/or        *
00015  * modify it under the terms of the GNU Library General Public       *
00016  * License as published by the Free Software Foundation; either      *
00017  * version 2 of the License, or (at your option) any later version.  *
00018  *                                                                   *
00019  * This work is distributed in the hope that it will be useful,      *
00020  * but WITHOUT ANY WARRANTY; without even the implied warranty of    *
00021  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU *
00022  * Library General Public License for more details.                  *
00023  *                                                                   *
00024  * You should have received a copy of the GNU Library General Public *
00025  * License along with this toolkit; if not, write to the             *
00026  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,      *
00027  * Boston, MA  02111-1307, USA.                                      *
00028  *                                                                   *
00029  * Java is a trademark of Sun Microsystems, Inc.                     *
00030  *                                                                   *
00031  * To submit a bug report, send a comment, or get the latest news on *
00032  * this project and other SAnToS projects, please visit the web-site *
00033  *                http://www.cis.ksu.edu/santos                      *
00034  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
00035 import java.lang.reflect.Modifier;
00036 import edu.ksu.cis.bandera.jjjc.exception.*;
00037 
00038 public class ArrayType extends ReferenceType {
00039     public final Type baseType;
00040     public int nDimensions;
00041     public Field length;
00042 /**
00043  * 
00044  * @param baseType edu.ksu.cis.bandera.jjjc.symboltable.Type
00045  * @param nDimensions int
00046  */
00047 public ArrayType(Type baseType, int nDimensions) {
00048     this.baseType = baseType;
00049     this.nDimensions = nDimensions;
00050     name = baseType.getName();
00051     try {
00052         length = new Field(new Name("length"), IntType.TYPE);
00053         length.modifiers = Modifier.PUBLIC | Modifier.FINAL;
00054         length.isArrayLength = true;
00055         length.arrayType = this;
00056     } catch (InvalidNameException e) {};
00057 }
00058 /**
00059  * 
00060  * @return java.lang.String
00061  */
00062 public String getFullyQualifiedName() {
00063     StringBuffer result = new StringBuffer(name.toString());
00064     for (int i = 0; i < nDimensions; i++) {
00065         result.append("[]");
00066     }
00067     
00068     return result.toString();
00069 }
00070 /**
00071  * 
00072  * @return edu.ksu.cis.bandera.jjjc.symboltable.Name
00073  */
00074 public Name getName() {
00075     return name;
00076 }
00077 /**
00078  * 
00079  * @return boolean
00080  * @param otherType edu.ksu.cis.bandera.jjjc.symboltable.Type
00081  */
00082 public boolean isValidNarrowingConversion(Type otherType){
00083     if ((otherType instanceof ArrayType) && (baseType instanceof ReferenceType)) {
00084         ArrayType otherArrayType = (ArrayType) otherType;
00085         return (otherArrayType.baseType instanceof ReferenceType) && (this.nDimensions == otherArrayType.nDimensions)
00086                 && (baseType.isValidNarrowingConversion(otherArrayType.baseType));
00087     } else return false;
00088 }
00089 /**
00090  * 
00091  * @return boolean
00092  * @param otherType edu.ksu.cis.bandera.jjjc.symboltable.Type
00093  */
00094 public boolean isValidWideningConversion(Type otherType) {
00095     if ("java.lang.Object".equals(otherType.getFullyQualifiedName()) ||
00096             "java.lang.Cloneable".equals(otherType.getFullyQualifiedName()))
00097         return true;
00098     else if ((otherType instanceof ArrayType) && (baseType instanceof ReferenceType)) {
00099         ArrayType otherArrayType = (ArrayType) otherType;
00100         return (otherArrayType.baseType instanceof ReferenceType) && (this.nDimensions == otherArrayType.nDimensions)
00101                 && (baseType.isValidWideningConversion(otherArrayType.baseType));
00102     } else return false;
00103 }
00104 }