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diff --git a/src/main/java/cuchaz/enigma/analysis/ParsedJar.java b/src/main/java/cuchaz/enigma/analysis/ParsedJar.java
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+++ b/src/main/java/cuchaz/enigma/analysis/ParsedJar.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
+ * <p>
+ * Contributors:
+ * Jeff Martin - initial API and implementation
+ ******************************************************************************/
+
+package cuchaz.enigma.analysis;
+
+import cuchaz.enigma.mapping.ClassEntry;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.tree.ClassNode;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.*;
+import java.util.function.Consumer;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+
+public class ParsedJar {
+        private final Map<String, ClassNode> nodes = new LinkedHashMap<>();
+
+        public ParsedJar(JarFile jar) throws IOException {
+                try {
+                        // get the jar entries that correspond to classes
+                        Enumeration<JarEntry> entries = jar.entries();
+                        while (entries.hasMoreElements()) {
+                                JarEntry entry = entries.nextElement();
+                                // is this a class file?
+                                if (entry.getName().endsWith(".class")) {
+                                        try (InputStream input = jar.getInputStream(entry)) {
+                                                // read the ClassNode from the jar
+                                                ClassReader reader = new ClassReader(input);
+                                                ClassNode node = new ClassNode();
+                                                reader.accept(node, 0);
+                                                String path = entry.getName().substring(0, entry.getName().length() - ".class".length());
+                                                nodes.put(path, node);
+                                        }
+                                }
+                        }
+                } finally {
+                        jar.close();
+                }
+        }
+
+        public void visit(Consumer<ClassNode> visitor) {
+                for (ClassNode node : nodes.values()) {
+                        visitor.accept(node);
+                }
+        }
+
+        public int getClassCount() {
+                return nodes.size();
+        }
+
+        public List<ClassEntry> getClassEntries() {
+                List<ClassEntry> entries = new ArrayList<>(nodes.size());
+                for (ClassNode node : nodes.values()) {
+                        entries.add(new ClassEntry(node.name));
+                }
+                return entries;
+        }
+
+        public ClassNode getClassNode(String name) {
+                return nodes.get(name);
+        }
+}