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diff --git a/src/cuchaz/enigma/convert/ClassMatching.java b/src/cuchaz/enigma/convert/ClassMatching.java
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+++ b/src/cuchaz/enigma/convert/ClassMatching.java
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+/*******************************************************************************
+ * Copyright (c) 2014 Jeff Martin.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ * 
+ * Contributors:
+ *     Jeff Martin - initial API and implementation
+ ******************************************************************************/
+package cuchaz.enigma.convert;
+
+import java.util.AbstractMap;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Multimap;
+
+public class ClassMatching {
+        
+        private Multimap<ClassIdentity,ClassIdentity> m_sourceClasses;
+        private Multimap<ClassIdentity,ClassIdentity> m_matchedDestClasses;
+        private List<ClassIdentity> m_unmatchedDestClasses;
+        
+        public ClassMatching() {
+                m_sourceClasses = ArrayListMultimap.create();
+                m_matchedDestClasses = ArrayListMultimap.create();
+                m_unmatchedDestClasses = Lists.newArrayList();
+        }
+        
+        public void addSource(ClassIdentity c) {
+                m_sourceClasses.put(c, c);
+        }
+        
+        public void matchDestClass(ClassIdentity destClass) {
+                Collection<ClassIdentity> matchedSourceClasses = m_sourceClasses.get(destClass);
+                if (matchedSourceClasses.isEmpty()) {
+                        // no match
+                        m_unmatchedDestClasses.add(destClass);
+                } else {
+                        // found a match
+                        m_matchedDestClasses.put(destClass, destClass);
+                        
+                        // DEBUG
+                        ClassIdentity sourceClass = matchedSourceClasses.iterator().next();
+                        assert (sourceClass.hashCode() == destClass.hashCode());
+                        assert (sourceClass.equals(destClass));
+                }
+        }
+        
+        public void removeSource(ClassIdentity sourceClass) {
+                m_sourceClasses.remove(sourceClass, sourceClass);
+        }
+        
+        public void removeDest(ClassIdentity destClass) {
+                m_matchedDestClasses.remove(destClass, destClass);
+                m_unmatchedDestClasses.remove(destClass);
+        }
+        
+        public List<ClassIdentity> getSourceClasses() {
+                return new ArrayList<ClassIdentity>(m_sourceClasses.values());
+        }
+        
+        public List<ClassIdentity> getDestClasses() {
+                List<ClassIdentity> classes = Lists.newArrayList();
+                classes.addAll(m_matchedDestClasses.values());
+                classes.addAll(m_unmatchedDestClasses);
+                return classes;
+        }
+        
+        public BiMap<ClassIdentity,ClassIdentity> getUniqueMatches() {
+                BiMap<ClassIdentity,ClassIdentity> uniqueMatches = HashBiMap.create();
+                for (ClassIdentity sourceClass : m_sourceClasses.keySet()) {
+                        Collection<ClassIdentity> matchedSourceClasses = m_sourceClasses.get(sourceClass);
+                        Collection<ClassIdentity> matchedDestClasses = m_matchedDestClasses.get(sourceClass);
+                        if (matchedSourceClasses.size() == 1 && matchedDestClasses.size() == 1) {
+                                ClassIdentity matchedSourceClass = matchedSourceClasses.iterator().next();
+                                ClassIdentity matchedDestClass = matchedDestClasses.iterator().next();
+                                uniqueMatches.put(matchedSourceClass, matchedDestClass);
+                        }
+                }
+                return uniqueMatches;
+        }
+        
+        public BiMap<List<ClassIdentity>,List<ClassIdentity>> getAmbiguousMatches() {
+                BiMap<List<ClassIdentity>,List<ClassIdentity>> ambiguousMatches = HashBiMap.create();
+                for (ClassIdentity sourceClass : m_sourceClasses.keySet()) {
+                        Collection<ClassIdentity> matchedSourceClasses = m_sourceClasses.get(sourceClass);
+                        Collection<ClassIdentity> matchedDestClasses = m_matchedDestClasses.get(sourceClass);
+                        if (matchedSourceClasses.size() > 1 && matchedDestClasses.size() > 1) {
+                                ambiguousMatches.put(
+                                        new ArrayList<ClassIdentity>(matchedSourceClasses),
+                                        new ArrayList<ClassIdentity>(matchedDestClasses)
+                                );
+                        }
+                }
+                return ambiguousMatches;
+        }
+        
+        public int getNumAmbiguousSourceMatches() {
+                int num = 0;
+                for (Map.Entry<List<ClassIdentity>,List<ClassIdentity>> entry : getAmbiguousMatches().entrySet()) {
+                        num += entry.getKey().size();
+                }
+                return num;
+        }
+        
+        public int getNumAmbiguousDestMatches() {
+                int num = 0;
+                for (Map.Entry<List<ClassIdentity>,List<ClassIdentity>> entry : getAmbiguousMatches().entrySet()) {
+                        num += entry.getValue().size();
+                }
+                return num;
+        }
+        
+        public List<ClassIdentity> getUnmatchedSourceClasses() {
+                List<ClassIdentity> classes = Lists.newArrayList();
+                for (ClassIdentity sourceClass : getSourceClasses()) {
+                        if (m_matchedDestClasses.get(sourceClass).isEmpty()) {
+                                classes.add(sourceClass);
+                        }
+                }
+                return classes;
+        }
+        
+        public List<ClassIdentity> getUnmatchedDestClasses() {
+                return new ArrayList<ClassIdentity>(m_unmatchedDestClasses);
+        }
+        
+        public Map<String,Map.Entry<ClassIdentity,List<ClassIdentity>>> getIndex() {
+                Map<String,Map.Entry<ClassIdentity,List<ClassIdentity>>> conversion = Maps.newHashMap();
+                for (Map.Entry<ClassIdentity,ClassIdentity> entry : getUniqueMatches().entrySet()) {
+                        conversion.put(
+                                entry.getKey().getClassEntry().getName(),
+                                new AbstractMap.SimpleEntry<ClassIdentity,List<ClassIdentity>>(entry.getKey(), Arrays.asList(entry.getValue()))
+                        );
+                }
+                for (Map.Entry<List<ClassIdentity>,List<ClassIdentity>> entry : getAmbiguousMatches().entrySet()) {
+                        for (ClassIdentity sourceClass : entry.getKey()) {
+                                conversion.put(
+                                        sourceClass.getClassEntry().getName(),
+                                        new AbstractMap.SimpleEntry<ClassIdentity,List<ClassIdentity>>(sourceClass, entry.getValue())
+                                );
+                        }
+                }
+                for (ClassIdentity sourceClass : getUnmatchedSourceClasses()) {
+                        conversion.put(
+                                sourceClass.getClassEntry().getName(),
+                                new AbstractMap.SimpleEntry<ClassIdentity,List<ClassIdentity>>(sourceClass, getUnmatchedDestClasses())
+                        );
+                }
+                return conversion;
+        }
+        
+        @Override
+        public String toString() {
+                StringBuilder buf = new StringBuilder();
+                buf.append(String.format("%12s%8s%8s\n", "", "Source", "Dest"));
+                buf.append(String.format("%12s%8d%8d\n", "Classes", getSourceClasses().size(), getDestClasses().size()));
+                buf.append(String.format("%12s%8d%8d\n", "Unique", getUniqueMatches().size(), getUniqueMatches().size()));
+                buf.append(String.format("%12s%8d%8d\n", "Ambiguous", getNumAmbiguousSourceMatches(), getNumAmbiguousDestMatches()));
+                buf.append(String.format("%12s%8d%8d\n", "Unmatched", getUnmatchedSourceClasses().size(), getUnmatchedDestClasses().size()));
+                return buf.toString();
+        }
+}