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diff --git a/ruby/src/main/java/com/google/protobuf/jruby/RubyEnumBuilderContext.java b/ruby/src/main/java/com/google/protobuf/jruby/RubyEnumBuilderContext.java
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+++ b/ruby/src/main/java/com/google/protobuf/jruby/RubyEnumBuilderContext.java
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+/*
+ * 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 org.jruby.Ruby;
+import org.jruby.RubyClass;
+import org.jruby.RubyModule;
+import org.jruby.RubyObject;
+import org.jruby.anno.JRubyClass;
+import org.jruby.anno.JRubyMethod;
+import org.jruby.runtime.ObjectAllocator;
+import org.jruby.runtime.ThreadContext;
+import org.jruby.runtime.builtin.IRubyObject;
+
+@JRubyClass(name = "EnumBuilderContext")
+public class RubyEnumBuilderContext extends RubyObject {
+    public static void createRubyEnumBuilderContext(Ruby runtime) {
+        RubyModule protobuf = runtime.getClassFromPath("Google::Protobuf");
+        RubyClass cMessageBuilderContext = protobuf.defineClassUnder("EnumBuilderContext", runtime.getObject(), new ObjectAllocator() {
+            @Override
+            public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
+                return new RubyEnumBuilderContext(runtime, klazz);
+            }
+        });
+        cMessageBuilderContext.defineAnnotatedMethods(RubyEnumBuilderContext.class);
+    }
+
+    public RubyEnumBuilderContext(Ruby ruby, RubyClass klazz) {
+        super(ruby, klazz);
+    }
+
+    @JRubyMethod
+    public IRubyObject initialize(ThreadContext context, IRubyObject enumDescriptor) {
+        this.enumDescriptor = (RubyEnumDescriptor) enumDescriptor;
+        return this;
+    }
+
+    /*
+     * call-seq:
+     *     EnumBuilder.add_value(name, number)
+     *
+     * Adds the given name => number mapping to the enum type. Name must be a Ruby
+     * symbol.
+     */
+    @JRubyMethod
+    public IRubyObject value(ThreadContext context, IRubyObject name, IRubyObject number) {
+        this.enumDescriptor.addValue(context, name, number);
+        return context.runtime.getNil();
+    }
+
+    private RubyEnumDescriptor enumDescriptor;
+}