Mirror of the BLOAT repository
https://www.cs.purdue.edu/homes/hosking/bloat/
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120 lines
3.5 KiB
120 lines
3.5 KiB
/**
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* All files in the distribution of BLOAT (Bytecode Level Optimization and
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* Analysis tool for Java(tm)) are Copyright 1997-2001 by the Purdue
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* Research Foundation of Purdue University. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package EDU.purdue.cs.bloat.editor;
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import java.util.*;
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import EDU.purdue.cs.bloat.util.*;
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// // For testing only
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// import EDU.purdue.cs.bloat.file.*;
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// import EDU.purdue.cs.bloat.context.*;
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/**
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* A <tt>TypeComparator</tt> orders <tt>Type</tt>s such that a subclass
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* preceededs its superclass. Note that this doesn't really work with
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* interfaces.
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*/
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public final class TypeComparator implements Comparator {
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public static boolean DEBUG = false;
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private EditorContext context;
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private static void db(final String s) {
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if (TypeComparator.DEBUG) {
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System.out.println(s);
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}
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}
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/**
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* Constructor.
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*/
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public TypeComparator(final EditorContext context) {
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this.context = context;
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}
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/**
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* Returns a negative value if o1 < o2 (t1 is a subclass of t2). Otherwise,
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* it returns a positive value.
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*/
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public int compare(final Object o1, final Object o2) {
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Assert.isTrue(o1 instanceof Type, o1 + " is not a Type");
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Assert.isTrue(o2 instanceof Type, o2 + " is not a Type");
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final Type t1 = (Type) o1;
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final Type t2 = (Type) o2;
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TypeComparator.db("Comparing " + t1 + " to " + t2);
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final ClassHierarchy hier = context.getHierarchy();
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if (hier.subclassOf(t1, t2)) {
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TypeComparator.db(" " + t1 + " is a subclass of " + t2);
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return (-1);
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} else if (hier.subclassOf(t2, t1)) {
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TypeComparator.db(" " + t2 + " is a subclass of " + t1);
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return (1);
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} else {
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TypeComparator.db(" " + t1 + " and " + t2 + " are unrelated");
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// Don't return 0. If you do, the type will not get included in
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// the sorted set. Weird.
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return (1);
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}
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}
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/**
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* Indicates whether some other object is "equal to" this Comparator.
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*/
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public boolean equals(final Object other) {
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return (other instanceof TypeComparator);
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}
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// /**
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// * Test program. Reads class names from the command line.
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// */
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// public static void main(String[] args) {
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// // Make a list of class names
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// List names = new ArrayList();
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// for(int i = 0; i < args.length; i++) {
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// names.add(args[i]);
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// }
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// // Do some BLOAT magic
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// EditorContext context =
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// new CachingBloatContext(new ClassFileLoader(), names, false);
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// Collection classes = context.getHierarchy().classes();
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// TypeComparator.DEBUG = true;
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// SortedSet sorted = new TreeSet(new TypeComparator(context));
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// sorted.addAll(classes);
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// System.out.println(classes.size() + " classes");
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// System.out.println(sorted.size() + " sorted types:");
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// Object[] array = sorted.toArray();
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// for(int i = 0; i < array.length; i++) {
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// System.out.println(" " + array[i]);
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// }
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// }
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}
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