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diff --git a/src/cuchaz/enigma/convert/ClassMatches.java b/src/cuchaz/enigma/convert/ClassMatches.java
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+++ b/src/cuchaz/enigma/convert/ClassMatches.java
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+/*******************************************************************************
+ * Copyright (c) 2015 Jeff Martin.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Lesser General Public
+ * License v3.0 which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/lgpl.html
+ * 
+ * Contributors:
+ *     Jeff Martin - initial API and implementation
+ ******************************************************************************/
+package cuchaz.enigma.convert;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
+
+import cuchaz.enigma.mapping.ClassEntry;
+
+
+public class ClassMatches implements Iterable<ClassMatch> {
+
+        Collection<ClassMatch> m_matches;
+        Map<ClassEntry,ClassMatch> m_matchesBySource;
+        Map<ClassEntry,ClassMatch> m_matchesByDest;
+        BiMap<ClassEntry,ClassEntry> m_uniqueMatches;
+        Map<ClassEntry,ClassMatch> m_ambiguousMatchesBySource;
+        Map<ClassEntry,ClassMatch> m_ambiguousMatchesByDest;
+        Set<ClassEntry> m_unmatchedSourceClasses;
+        Set<ClassEntry> m_unmatchedDestClasses;
+        
+        public ClassMatches() {
+                this(new ArrayList<ClassMatch>());
+        }
+        
+        public ClassMatches(Collection<ClassMatch> matches) {
+                m_matches = matches;
+                m_matchesBySource = Maps.newHashMap();
+                m_matchesByDest = Maps.newHashMap();
+                m_uniqueMatches = HashBiMap.create();
+                m_ambiguousMatchesBySource = Maps.newHashMap();
+                m_ambiguousMatchesByDest = Maps.newHashMap();
+                m_unmatchedSourceClasses = Sets.newHashSet();
+                m_unmatchedDestClasses = Sets.newHashSet();
+                
+                for (ClassMatch match : matches) {
+                        indexMatch(match);
+                }
+        }
+
+        public void add(ClassMatch match) {
+                m_matches.add(match);
+                indexMatch(match);
+        }
+        
+        public void remove(ClassMatch match) {
+                for (ClassEntry sourceClass : match.sourceClasses) {
+                        m_matchesBySource.remove(sourceClass);
+                        m_uniqueMatches.remove(sourceClass);
+                        m_ambiguousMatchesBySource.remove(sourceClass);
+                        m_unmatchedSourceClasses.remove(sourceClass);
+                }
+                for (ClassEntry destClass : match.destClasses) {
+                        m_matchesByDest.remove(destClass);
+                        m_uniqueMatches.inverse().remove(destClass);
+                        m_ambiguousMatchesByDest.remove(destClass);
+                        m_unmatchedDestClasses.remove(destClass);
+                }
+                m_matches.remove(match);
+        }
+
+        public int size() {
+                return m_matches.size();
+        }
+
+        @Override
+        public Iterator<ClassMatch> iterator() {
+                return m_matches.iterator();
+        }
+        
+        private void indexMatch(ClassMatch match) {
+                if (!match.isMatched()) {
+                        // unmatched
+                        m_unmatchedSourceClasses.addAll(match.sourceClasses);
+                        m_unmatchedDestClasses.addAll(match.destClasses);
+                } else {
+                        if (match.isAmbiguous()) {
+                                // ambiguously matched
+                                for (ClassEntry entry : match.sourceClasses) {
+                                        m_ambiguousMatchesBySource.put(entry, match);
+                                }
+                                for (ClassEntry entry : match.destClasses) {
+                                        m_ambiguousMatchesByDest.put(entry, match);
+                                }
+                        } else {
+                                // uniquely matched
+                                m_uniqueMatches.put(match.getUniqueSource(), match.getUniqueDest());
+                        }
+                }
+                for (ClassEntry entry : match.sourceClasses) {
+                        m_matchesBySource.put(entry, match);
+                }
+                for (ClassEntry entry : match.destClasses) {
+                        m_matchesByDest.put(entry, match);
+                }
+        }
+        
+        public BiMap<ClassEntry,ClassEntry> getUniqueMatches() {
+                return m_uniqueMatches;
+        }
+        
+        public Set<ClassEntry> getUnmatchedSourceClasses() {
+                return m_unmatchedSourceClasses;
+        }
+        
+        public Set<ClassEntry> getUnmatchedDestClasses() {
+                return m_unmatchedDestClasses;
+        }
+
+        public Set<ClassEntry> getAmbiguouslyMatchedSourceClasses() {
+                return m_ambiguousMatchesBySource.keySet();
+        }
+        
+        public ClassMatch getAmbiguousMatchBySource(ClassEntry sourceClass) {
+                return m_ambiguousMatchesBySource.get(sourceClass);
+        }
+
+        public ClassMatch getMatchBySource(ClassEntry sourceClass) {
+                return m_matchesBySource.get(sourceClass);
+        }
+        
+        public ClassMatch getMatchByDest(ClassEntry destClass) {
+                return m_matchesByDest.get(destClass);
+        }
+        
+        public void removeSource(ClassEntry sourceClass) {
+                ClassMatch match = m_matchesBySource.get(sourceClass);
+                if (match != null) {
+                        remove(match);
+                        match.sourceClasses.remove(sourceClass);
+                        if (!match.sourceClasses.isEmpty() || !match.destClasses.isEmpty()) {
+                                add(match);
+                        }
+                }
+        }
+        
+        public void removeDest(ClassEntry destClass) {
+                ClassMatch match = m_matchesByDest.get(destClass);
+                if (match != null) {
+                        remove(match);
+                        match.destClasses.remove(destClass);
+                        if (!match.sourceClasses.isEmpty() || !match.destClasses.isEmpty()) {
+                                add(match);
+                        }
+                }
+        }
+}