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diff --git a/ruby/src/main/java/com/google/protobuf/jruby/RubyDescriptor.java b/ruby/src/main/java/com/google/protobuf/jruby/RubyDescriptor.java
new file mode 100644
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+++ b/ruby/src/main/java/com/google/protobuf/jruby/RubyDescriptor.java
@@ -0,0 +1,267 @@
+/*
+ * Protocol Buffers - Google's data interchange format
+ * Copyright 2014 Google Inc.  All rights reserved.
+ * https://developers.google.com/protocol-buffers/
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package com.google.protobuf.jruby;
+
+import com.google.protobuf.DescriptorProtos;
+import com.google.protobuf.Descriptors;
+import org.jruby.*;
+import org.jruby.anno.JRubyClass;
+import org.jruby.anno.JRubyMethod;
+import org.jruby.runtime.Block;
+import org.jruby.runtime.ObjectAllocator;
+import org.jruby.runtime.ThreadContext;
+import org.jruby.runtime.builtin.IRubyObject;
+
+import java.util.HashMap;
+import java.util.Map;
+
+
+@JRubyClass(name = "Descriptor", include = "Enumerable")
+public class RubyDescriptor extends RubyObject {
+    public static void createRubyDescriptor(Ruby runtime) {
+        RubyModule protobuf = runtime.getClassFromPath("Google::Protobuf");
+        RubyClass cDescriptor = protobuf.defineClassUnder("Descriptor", runtime.getObject(), new ObjectAllocator() {
+            @Override
+            public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
+                return new RubyDescriptor(runtime, klazz);
+            }
+        });
+        cDescriptor.includeModule(runtime.getEnumerable());
+        cDescriptor.defineAnnotatedMethods(RubyDescriptor.class);
+    }
+
+    public RubyDescriptor(Ruby runtime, RubyClass klazz) {
+        super(runtime, klazz);
+    }
+
+    /*
+     * call-seq:
+     *     Descriptor.new => descriptor
+     *
+     * Creates a new, empty, message type descriptor. At a minimum, its name must be
+     * set before it is added to a pool. It cannot be used to create messages until
+     * it is added to a pool, after which it becomes immutable (as part of a
+     * finalization process).
+     */
+    @JRubyMethod
+    public IRubyObject initialize(ThreadContext context) {
+        this.builder = DescriptorProtos.DescriptorProto.newBuilder();
+        this.fieldDefMap = new HashMap<String, RubyFieldDescriptor>();
+        this.oneofDefs = new HashMap<IRubyObject, RubyOneofDescriptor>();
+        return this;
+    }
+
+    /*
+     * call-seq:
+     *     Descriptor.name => name
+     *
+     * Returns the name of this message type as a fully-qualfied string (e.g.,
+     * My.Package.MessageType).
+     */
+    @JRubyMethod(name = "name")
+    public IRubyObject getName(ThreadContext context) {
+        return this.name;
+    }
+
+    /*
+     * call-seq:
+     *    Descriptor.name = name
+     *
+     * Assigns a name to this message type. The descriptor must not have been added
+     * to a pool yet.
+     */
+    @JRubyMethod(name = "name=")
+    public IRubyObject setName(ThreadContext context, IRubyObject name) {
+        this.name = name;
+        this.builder.setName(Utils.escapeIdentifier(this.name.asJavaString()));
+        return context.runtime.getNil();
+    }
+
+    /*
+     * call-seq:
+     *     Descriptor.add_field(field) => nil
+     *
+     * Adds the given FieldDescriptor to this message type. The descriptor must not
+     * have been added to a pool yet. Raises an exception if a field with the same
+     * name or number already exists. Sub-type references (e.g. for fields of type
+     * message) are not resolved at this point.
+     */
+    @JRubyMethod(name = "add_field")
+    public IRubyObject addField(ThreadContext context, IRubyObject obj) {
+        RubyFieldDescriptor fieldDef = (RubyFieldDescriptor) obj;
+        this.fieldDefMap.put(fieldDef.getName(context).asJavaString(), fieldDef);
+        this.builder.addField(fieldDef.build());
+        return context.runtime.getNil();
+    }
+
+    /*
+     * call-seq:
+     *     Descriptor.lookup(name) => FieldDescriptor
+     *
+     * Returns the field descriptor for the field with the given name, if present,
+     * or nil if none.
+     */
+    @JRubyMethod
+    public IRubyObject lookup(ThreadContext context, IRubyObject fieldName) {
+        return this.fieldDefMap.get(fieldName.asJavaString());
+    }
+
+    /*
+     * call-seq:
+     *     Descriptor.msgclass => message_klass
+     *
+     * Returns the Ruby class created for this message type. Valid only once the
+     * message type has been added to a pool.
+     */
+    @JRubyMethod
+    public IRubyObject msgclass(ThreadContext context) {
+        if (this.klazz == null) {
+            this.klazz = buildClassFromDescriptor(context);
+        }
+        return this.klazz;
+    }
+
+    /*
+     * call-seq:
+     *     Descriptor.each(&block)
+     *
+     * Iterates over fields in this message type, yielding to the block on each one.
+     */
+    @JRubyMethod
+    public IRubyObject each(ThreadContext context, Block block) {
+        for (Map.Entry<String, RubyFieldDescriptor> entry : fieldDefMap.entrySet()) {
+            block.yield(context, entry.getValue());
+        }
+        return context.runtime.getNil();
+    }
+
+    /*
+     * call-seq:
+     *     Descriptor.add_oneof(oneof) => nil
+     *
+     * Adds the given OneofDescriptor to this message type. This descriptor must not
+     * have been added to a pool yet. Raises an exception if a oneof with the same
+     * name already exists, or if any of the oneof's fields' names or numbers
+     * conflict with an existing field in this message type. All fields in the oneof
+     * are added to the message descriptor. Sub-type references (e.g. for fields of
+     * type message) are not resolved at this point.
+     */
+    @JRubyMethod(name = "add_oneof")
+    public IRubyObject addOneof(ThreadContext context, IRubyObject obj) {
+        RubyOneofDescriptor def = (RubyOneofDescriptor) obj;
+        builder.addOneofDecl(def.build(builder.getOneofDeclCount()));
+        for (RubyFieldDescriptor fieldDescriptor : def.getFields()) {
+            addField(context, fieldDescriptor);
+        }
+        oneofDefs.put(def.getName(context), def);
+        return context.runtime.getNil();
+    }
+
+    /*
+     * call-seq:
+     *     Descriptor.each_oneof(&block) => nil
+     *
+     * Invokes the given block for each oneof in this message type, passing the
+     * corresponding OneofDescriptor.
+     */
+    @JRubyMethod(name = "each_oneof")
+    public IRubyObject eachOneof(ThreadContext context, Block block) {
+        for (RubyOneofDescriptor oneofDescriptor : oneofDefs.values()) {
+            block.yieldSpecific(context, oneofDescriptor);
+        }
+        return context.runtime.getNil();
+    }
+
+    /*
+     * call-seq:
+     *     Descriptor.lookup_oneof(name) => OneofDescriptor
+     *
+     * Returns the oneof descriptor for the oneof with the given name, if present,
+     * or nil if none.
+     */
+    @JRubyMethod(name = "lookup_oneof")
+    public IRubyObject lookupOneof(ThreadContext context, IRubyObject name) {
+        if (name instanceof RubySymbol) {
+            name = ((RubySymbol) name).id2name();
+        }
+        return oneofDefs.containsKey(name) ? oneofDefs.get(name) : context.runtime.getNil();
+    }
+
+    public void setDescriptor(Descriptors.Descriptor descriptor) {
+        this.descriptor = descriptor;
+    }
+
+    public Descriptors.Descriptor getDescriptor() {
+        return this.descriptor;
+    }
+
+    public DescriptorProtos.DescriptorProto.Builder getBuilder() {
+        return builder;
+    }
+
+    public void setMapEntry(boolean isMapEntry) {
+        this.builder.setOptions(DescriptorProtos.MessageOptions.newBuilder().setMapEntry(isMapEntry));
+    }
+
+    private RubyModule buildClassFromDescriptor(ThreadContext context) {
+        Ruby runtime = context.runtime;
+
+        ObjectAllocator allocator = new ObjectAllocator() {
+            @Override
+            public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
+                return new RubyMessage(runtime, klazz, descriptor);
+            }
+        };
+
+        // rb_define_class_id
+        RubyClass klass = RubyClass.newClass(runtime, runtime.getObject());
+        klass.setAllocator(allocator);
+        klass.makeMetaClass(runtime.getObject().getMetaClass());
+        klass.inherit(runtime.getObject());
+        klass.instance_variable_set(runtime.newString(Utils.DESCRIPTOR_INSTANCE_VAR), this);
+        klass.defineAnnotatedMethods(RubyMessage.class);
+        return klass;
+    }
+
+    protected RubyFieldDescriptor lookup(String fieldName) {
+        return fieldDefMap.get(Utils.unescapeIdentifier(fieldName));
+    }
+
+    private IRubyObject name;
+    private RubyModule klazz;
+
+    private DescriptorProtos.DescriptorProto.Builder builder;
+    private Descriptors.Descriptor descriptor;
+    private Map<String, RubyFieldDescriptor> fieldDefMap;
+    private Map<IRubyObject, RubyOneofDescriptor> oneofDefs;
+}