Update //third_party/protobuf to version 3.

third_party/protobuf/ruby/src/main/java/com/google/protobuf/jruby/RubyMessage.java

Index: third_party/protobuf/ruby/src/main/java/com/google/protobuf/jruby/RubyMessage.java
diff --git a/third_party/protobuf/ruby/src/main/java/com/google/protobuf/jruby/RubyMessage.java b/third_party/protobuf/ruby/src/main/java/com/google/protobuf/jruby/RubyMessage.java
new file mode 100644
index 0000000000000000000000000000000000000000..547ab22cb2d6c3dbf819691e32707c54b368849b
--- /dev/null
+++ b/third_party/protobuf/ruby/src/main/java/com/google/protobuf/jruby/RubyMessage.java
@@ -0,0 +1,753 @@
+/*
+ * 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.*;
+import org.jruby.*;
+import org.jruby.anno.JRubyMethod;
+import org.jruby.runtime.Block;
+import org.jruby.runtime.Helpers;
+import org.jruby.runtime.ThreadContext;
+import org.jruby.runtime.builtin.IRubyObject;
+import org.jruby.util.ByteList;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class RubyMessage extends RubyObject {
+    public RubyMessage(Ruby ruby, RubyClass klazz, Descriptors.Descriptor descriptor) {
+        super(ruby, klazz);
+        this.descriptor = descriptor;
+    }
+
+    /*
+     * call-seq:
+     *     Message.new(kwargs) => new_message
+     *
+     * Creates a new instance of the given message class. Keyword arguments may be
+     * provided with keywords corresponding to field names.
+     *
+     * Note that no literal Message class exists. Only concrete classes per message
+     * type exist, as provided by the #msgclass method on Descriptors after they
+     * have been added to a pool. The method definitions described here on the
+     * Message class are provided on each concrete message class.
+     */
+    @JRubyMethod(optional = 1)
+    public IRubyObject initialize(final ThreadContext context, IRubyObject[] args) {
+        final Ruby runtime = context.runtime;
+        this.cRepeatedField = (RubyClass) runtime.getClassFromPath("Google::Protobuf::RepeatedField");
+        this.cMap = (RubyClass) runtime.getClassFromPath("Google::Protobuf::Map");
+        this.builder = DynamicMessage.newBuilder(this.descriptor);
+        this.repeatedFields = new HashMap<Descriptors.FieldDescriptor, RubyRepeatedField>();
+        this.maps = new HashMap<Descriptors.FieldDescriptor, RubyMap>();
+        this.fields = new HashMap<Descriptors.FieldDescriptor, IRubyObject>();
+        this.oneofCases = new HashMap<Descriptors.OneofDescriptor, Descriptors.FieldDescriptor>();
+        if (args.length == 1) {
+            if (!(args[0] instanceof RubyHash)) {
+                throw runtime.newArgumentError("expected Hash arguments.");
+            }
+            RubyHash hash = args[0].convertToHash();
+            hash.visitAll(new RubyHash.Visitor() {
+                @Override
+                public void visit(IRubyObject key, IRubyObject value) {
+                    if (!(key instanceof RubySymbol))
+                        throw runtime.newTypeError("Expected symbols as hash keys in initialization map.");
+                    final Descriptors.FieldDescriptor fieldDescriptor = findField(context, key);
+
+                    if (Utils.isMapEntry(fieldDescriptor)) {
+                        if (!(value instanceof RubyHash))
+                            throw runtime.newArgumentError("Expected Hash object as initializer value for map field.");
+
+                        final RubyMap map = newMapForField(context, fieldDescriptor);
+                        map.mergeIntoSelf(context, value);
+                        maps.put(fieldDescriptor, map);
+                    } else if (fieldDescriptor.isRepeated()) {
+                        if (!(value instanceof RubyArray))
+                            throw runtime.newTypeError("Expected array as initializer var for repeated field.");
+                        RubyRepeatedField repeatedField = rubyToRepeatedField(context, fieldDescriptor, value);
+                        addRepeatedField(fieldDescriptor, repeatedField);
+                    } else {
+                        Descriptors.OneofDescriptor oneof = fieldDescriptor.getContainingOneof();
+                        if (oneof != null) {
+                            oneofCases.put(oneof, fieldDescriptor);
+                        }
+                        fields.put(fieldDescriptor, value);
+                    }
+
+                }
+            });
+        }
+        return this;
+    }
+
+    /*
+     * call-seq:
+     *     Message.[]=(index, value)
+     *
+     * Sets a field's value by field name. The provided field name should be a
+     * string.
+     */
+    @JRubyMethod(name = "[]=")
+    public IRubyObject indexSet(ThreadContext context, IRubyObject fieldName, IRubyObject value) {
+        Descriptors.FieldDescriptor fieldDescriptor = findField(context, fieldName);
+        return setField(context, fieldDescriptor, value);
+    }
+
+    /*
+     * call-seq:
+     *     Message.[](index) => value
+     *
+     * Accesses a field's value by field name. The provided field name should be a
+     * string.
+     */
+    @JRubyMethod(name = "[]")
+    public IRubyObject index(ThreadContext context, IRubyObject fieldName) {
+        Descriptors.FieldDescriptor fieldDescriptor = findField(context, fieldName);
+        return getField(context, fieldDescriptor);
+    }
+
+    /*
+     * call-seq:
+     *     Message.inspect => string
+     *
+     * Returns a human-readable string representing this message. It will be
+     * formatted as "<MessageType: field1: value1, field2: value2, ...>". Each
+     * field's value is represented according to its own #inspect method.
+     */
+    @JRubyMethod
+    public IRubyObject inspect() {
+        String cname = metaClass.getName();
+        StringBuilder sb = new StringBuilder("<");
+        sb.append(cname);
+        sb.append(": ");
+        sb.append(this.layoutInspect());
+        sb.append(">");
+
+        return getRuntime().newString(sb.toString());
+    }
+
+    /*
+     * call-seq:
+     *     Message.hash => hash_value
+     *
+     * Returns a hash value that represents this message's field values.
+     */
+    @JRubyMethod
+    public IRubyObject hash(ThreadContext context) {
+        int hashCode = System.identityHashCode(this);
+        return context.runtime.newFixnum(hashCode);
+    }
+
+    /*
+     * call-seq:
+     *     Message.==(other) => boolean
+     *
+     * Performs a deep comparison of this message with another. Messages are equal
+     * if they have the same type and if each field is equal according to the :==
+     * method's semantics (a more efficient comparison may actually be done if the
+     * field is of a primitive type).
+     */
+    @JRubyMethod(name = "==")
+    public IRubyObject eq(ThreadContext context, IRubyObject other) {
+        Ruby runtime = context.runtime;
+        if (!(other instanceof RubyMessage))
+            return runtime.getFalse();
+        RubyMessage message = (RubyMessage) other;
+        if (descriptor != message.descriptor) {
+            return runtime.getFalse();
+        }
+
+        for (Descriptors.FieldDescriptor fdef : descriptor.getFields()) {
+            IRubyObject thisVal = getField(context, fdef);
+            IRubyObject thatVal = message.getField(context, fdef);
+            IRubyObject ret = thisVal.callMethod(context, "==", thatVal);
+            if (!ret.isTrue()) {
+                return runtime.getFalse();
+            }
+        }
+        return runtime.getTrue();
+    }
+
+    /*
+     * call-seq:
+     *     Message.method_missing(*args)
+     *
+     * Provides accessors and setters for message fields according to their field
+     * names. For any field whose name does not conflict with a built-in method, an
+     * accessor is provided with the same name as the field, and a setter is
+     * provided with the name of the field plus the '=' suffix. Thus, given a
+     * message instance 'msg' with field 'foo', the following code is valid:
+     *
+     *     msg.foo = 42
+     *     puts msg.foo
+     */
+    @JRubyMethod(name = "method_missing", rest = true)
+    public IRubyObject methodMissing(ThreadContext context, IRubyObject[] args) {
+        if (args.length == 1) {
+            RubyDescriptor rubyDescriptor = (RubyDescriptor) getDescriptor(context, metaClass);
+            IRubyObject oneofDescriptor = rubyDescriptor.lookupOneof(context, args[0]);
+            if (oneofDescriptor.isNil()) {
+                return index(context, args[0]);
+            }
+            RubyOneofDescriptor rubyOneofDescriptor = (RubyOneofDescriptor) oneofDescriptor;
+            Descriptors.FieldDescriptor fieldDescriptor =
+                    oneofCases.get(rubyOneofDescriptor.getOneofDescriptor());
+            if (fieldDescriptor == null)
+                return context.runtime.getNil();
+
+            return context.runtime.newSymbol(fieldDescriptor.getName());
+        } else {
+            // fieldName is RubySymbol
+            RubyString field = args[0].asString();
+            RubyString equalSign = context.runtime.newString(Utils.EQUAL_SIGN);
+            if (field.end_with_p(context, equalSign).isTrue()) {
+                field.chomp_bang(context, equalSign);
+            }
+            return indexSet(context, field, args[1]);
+        }
+    }
+
+    /**
+     * call-seq:
+     * Message.dup => new_message
+     * Performs a shallow copy of this message and returns the new copy.
+     */
+    @JRubyMethod
+    public IRubyObject dup(ThreadContext context) {
+        RubyMessage dup = (RubyMessage) metaClass.newInstance(context, Block.NULL_BLOCK);
+        IRubyObject value;
+        for (Descriptors.FieldDescriptor fieldDescriptor : this.descriptor.getFields()) {
+            if (fieldDescriptor.isRepeated()) {
+                dup.addRepeatedField(fieldDescriptor, this.getRepeatedField(context, fieldDescriptor));
+            } else if (fields.containsKey(fieldDescriptor)) {
+                dup.fields.put(fieldDescriptor, fields.get(fieldDescriptor));
+            } else if (this.builder.hasField(fieldDescriptor)) {
+                dup.fields.put(fieldDescriptor, wrapField(context, fieldDescriptor, this.builder.getField(fieldDescriptor)));
+            }
+        }
+        for (Descriptors.FieldDescriptor fieldDescriptor : maps.keySet()) {
+            dup.maps.put(fieldDescriptor, maps.get(fieldDescriptor));
+        }
+        return dup;
+    }
+
+    /*
+     * call-seq:
+     *     Message.descriptor => descriptor
+     *
+     * Class method that returns the Descriptor instance corresponding to this
+     * message class's type.
+     */
+    @JRubyMethod(name = "descriptor", meta = true)
+    public static IRubyObject getDescriptor(ThreadContext context, IRubyObject recv) {
+        return ((RubyClass) recv).getInstanceVariable(Utils.DESCRIPTOR_INSTANCE_VAR);
+    }
+
+    /*
+     * call-seq:
+     *     MessageClass.encode(msg) => bytes
+     *
+     * Encodes the given message object to its serialized form in protocol buffers
+     * wire format.
+     */
+    @JRubyMethod(meta = true)
+    public static IRubyObject encode(ThreadContext context, IRubyObject recv, IRubyObject value) {
+        RubyMessage message = (RubyMessage) value;
+        return context.runtime.newString(new ByteList(message.build(context).toByteArray()));
+    }
+
+    /*
+     * call-seq:
+     *     MessageClass.decode(data) => message
+     *
+     * Decodes the given data (as a string containing bytes in protocol buffers wire
+     * format) under the interpretration given by this message class's definition
+     * and returns a message object with the corresponding field values.
+     */
+    @JRubyMethod(meta = true)
+    public static IRubyObject decode(ThreadContext context, IRubyObject recv, IRubyObject data) {
+        byte[] bin = data.convertToString().getBytes();
+        RubyMessage ret = (RubyMessage) ((RubyClass) recv).newInstance(context, Block.NULL_BLOCK);
+        try {
+            ret.builder.mergeFrom(bin);
+        } catch (InvalidProtocolBufferException e) {
+            throw context.runtime.newRuntimeError(e.getMessage());
+        }
+        return ret;
+    }
+
+    /*
+     * call-seq:
+     *     MessageClass.encode_json(msg) => json_string
+     *
+     * Encodes the given message object into its serialized JSON representation.
+     */
+    @JRubyMethod(name = "encode_json", meta = true)
+    public static IRubyObject encodeJson(ThreadContext context, IRubyObject recv, IRubyObject msgRb) {
+        RubyMessage message = (RubyMessage) msgRb;
+        return Helpers.invoke(context, message.toHash(context), "to_json");
+    }
+
+    /*
+     * call-seq:
+     *     MessageClass.decode_json(data) => message
+     *
+     * Decodes the given data (as a string containing bytes in protocol buffers wire
+     * format) under the interpretration given by this message class's definition
+     * and returns a message object with the corresponding field values.
+     */
+    @JRubyMethod(name = "decode_json", meta = true)
+    public static IRubyObject decodeJson(ThreadContext context, IRubyObject recv, IRubyObject json) {
+        Ruby runtime = context.runtime;
+        RubyMessage ret = (RubyMessage) ((RubyClass) recv).newInstance(context, Block.NULL_BLOCK);
+        RubyModule jsonModule = runtime.getClassFromPath("JSON");
+        RubyHash opts = RubyHash.newHash(runtime);
+        opts.fastASet(runtime.newSymbol("symbolize_names"), runtime.getTrue());
+        IRubyObject[] args = new IRubyObject[] { Helpers.invoke(context, jsonModule, "parse", json, opts) };
+        ret.initialize(context, args);
+        return ret;
+    }
+
+    @JRubyMethod(name = {"to_h", "to_hash"})
+    public IRubyObject toHash(ThreadContext context) {
+        Ruby runtime = context.runtime;
+        RubyHash ret = RubyHash.newHash(runtime);
+        for (Descriptors.FieldDescriptor fdef : this.descriptor.getFields()) {
+            IRubyObject value = getField(context, fdef);
+            if (!value.isNil()) {
+                if (value.respondsTo("to_h")) {
+                    value = Helpers.invoke(context, value, "to_h");
+                } else if (value.respondsTo("to_a")) {
+                    value = Helpers.invoke(context, value, "to_a");
+                }
+            }
+            ret.fastASet(runtime.newSymbol(fdef.getName()), value);
+        }
+        return ret;
+    }
+
+    protected DynamicMessage build(ThreadContext context) {
+        return build(context, 0);
+    }
+
+    protected DynamicMessage build(ThreadContext context, int depth) {
+        if (depth > SINK_MAXIMUM_NESTING) {
+            throw context.runtime.newRuntimeError("Maximum recursion depth exceeded during encoding.");
+        }
+        for (Descriptors.FieldDescriptor fieldDescriptor : maps.keySet()) {
+            this.builder.clearField(fieldDescriptor);
+            RubyDescriptor mapDescriptor = (RubyDescriptor) getDescriptorForField(context, fieldDescriptor);
+            for (DynamicMessage kv : maps.get(fieldDescriptor).build(context, mapDescriptor)) {
+                this.builder.addRepeatedField(fieldDescriptor, kv);
+            }
+        }
+        for (Descriptors.FieldDescriptor fieldDescriptor : repeatedFields.keySet()) {
+            RubyRepeatedField repeatedField = repeatedFields.get(fieldDescriptor);
+            this.builder.clearField(fieldDescriptor);
+            for (int i = 0; i < repeatedField.size(); i++) {
+                Object item = convert(context, fieldDescriptor, repeatedField.get(i), depth);
+                this.builder.addRepeatedField(fieldDescriptor, item);
+            }
+        }
+        for (Descriptors.FieldDescriptor fieldDescriptor : fields.keySet()) {
+            IRubyObject value = fields.get(fieldDescriptor);
+            this.builder.setField(fieldDescriptor, convert(context, fieldDescriptor, value, depth));
+        }
+        return this.builder.build();
+    }
+
+    protected Descriptors.Descriptor getDescriptor() {
+        return this.descriptor;
+    }
+
+    // Internal use only, called by Google::Protobuf.deep_copy
+    protected IRubyObject deepCopy(ThreadContext context) {
+        RubyMessage copy = (RubyMessage) metaClass.newInstance(context, Block.NULL_BLOCK);
+        for (Descriptors.FieldDescriptor fdef : this.descriptor.getFields()) {
+            if (fdef.isRepeated()) {
+                copy.addRepeatedField(fdef, this.getRepeatedField(context, fdef).deepCopy(context));
+            } else if (fields.containsKey(fdef)) {
+                copy.fields.put(fdef, fields.get(fdef));
+            } else if (this.builder.hasField(fdef)) {
+                copy.fields.put(fdef, wrapField(context, fdef, this.builder.getField(fdef)));
+            }
+        }
+        return copy;
+    }
+
+    private RubyRepeatedField getRepeatedField(ThreadContext context, Descriptors.FieldDescriptor fieldDescriptor) {
+        if (this.repeatedFields.containsKey(fieldDescriptor)) {
+            return this.repeatedFields.get(fieldDescriptor);
+        }
+        int count = this.builder.getRepeatedFieldCount(fieldDescriptor);
+        RubyRepeatedField ret = repeatedFieldForFieldDescriptor(context, fieldDescriptor);
+        for (int i = 0; i < count; i++) {
+            ret.push(context, wrapField(context, fieldDescriptor, this.builder.getRepeatedField(fieldDescriptor, i)));
+        }
+        addRepeatedField(fieldDescriptor, ret);
+        return ret;
+    }
+
+    private void addRepeatedField(Descriptors.FieldDescriptor fieldDescriptor, RubyRepeatedField repeatedField) {
+        this.repeatedFields.put(fieldDescriptor, repeatedField);
+    }
+
+    private IRubyObject buildFrom(ThreadContext context, DynamicMessage dynamicMessage) {
+        this.builder.mergeFrom(dynamicMessage);
+        return this;
+    }
+
+    private Descriptors.FieldDescriptor findField(ThreadContext context, IRubyObject fieldName) {
+        String nameStr = fieldName.asJavaString();
+        Descriptors.FieldDescriptor ret = this.descriptor.findFieldByName(Utils.escapeIdentifier(nameStr));
+        if (ret == null)
+            throw context.runtime.newArgumentError("field " + fieldName.asJavaString() + " is not found");
+        return ret;
+    }
+
+    private void checkRepeatedFieldType(ThreadContext context, IRubyObject value,
+                                        Descriptors.FieldDescriptor fieldDescriptor) {
+        Ruby runtime = context.runtime;
+        if (!(value instanceof RubyRepeatedField)) {
+            throw runtime.newTypeError("Expected repeated field array");
+        }
+    }
+
+    // convert a ruby object to protobuf type, with type check
+    private Object convert(ThreadContext context,
+                           Descriptors.FieldDescriptor fieldDescriptor,
+                           IRubyObject value, int depth) {
+        Ruby runtime = context.runtime;
+        Object val = null;
+        switch (fieldDescriptor.getType()) {
+            case INT32:
+            case INT64:
+            case UINT32:
+            case UINT64:
+                if (!Utils.isRubyNum(value)) {
+                    throw runtime.newTypeError("Expected number type for integral field.");
+                }
+                Utils.checkIntTypePrecision(context, fieldDescriptor.getType(), value);
+                switch (fieldDescriptor.getType()) {
+                    case INT32:
+                        val = RubyNumeric.num2int(value);
+                        break;
+                    case INT64:
+                        val = RubyNumeric.num2long(value);
+                        break;
+                    case UINT32:
+                        val = Utils.num2uint(value);
+                        break;
+                    case UINT64:
+                        val = Utils.num2ulong(context.runtime, value);
+                        break;
+                    default:
+                        break;
+                }
+                break;
+            case FLOAT:
+                if (!Utils.isRubyNum(value))
+                    throw runtime.newTypeError("Expected number type for float field.");
+                val = (float) RubyNumeric.num2dbl(value);
+                break;
+            case DOUBLE:
+                if (!Utils.isRubyNum(value))
+                    throw runtime.newTypeError("Expected number type for double field.");
+                val = RubyNumeric.num2dbl(value);
+                break;
+            case BOOL:
+                if (!(value instanceof RubyBoolean))
+                    throw runtime.newTypeError("Invalid argument for boolean field.");
+                val = value.isTrue();
+                break;
+            case BYTES:
+            case STRING:
+                Utils.validateStringEncoding(context.runtime, fieldDescriptor.getType(), value);
+                RubyString str = (RubyString) value;
+                switch (fieldDescriptor.getType()) {
+                    case BYTES:
+                        val = ByteString.copyFrom(str.getBytes());
+                        break;
+                    case STRING:
+                        val = str.asJavaString();
+                        break;
+                    default:
+                        break;
+                }
+                break;
+            case MESSAGE:
+                RubyClass typeClass = (RubyClass) ((RubyDescriptor) getDescriptorForField(context, fieldDescriptor)).msgclass(context);
+                if (!value.getMetaClass().equals(typeClass))
+                    throw runtime.newTypeError(value, "Invalid type to assign to submessage field.");
+                val = ((RubyMessage) value).build(context, depth + 1);
+                break;
+            case ENUM:
+                Descriptors.EnumDescriptor enumDescriptor = fieldDescriptor.getEnumType();
+
+                if (Utils.isRubyNum(value)) {
+                    val = enumDescriptor.findValueByNumberCreatingIfUnknown(RubyNumeric.num2int(value));
+                } else if (value instanceof RubySymbol) {
+                    val = enumDescriptor.findValueByName(value.asJavaString());
+                } else {
+                    throw runtime.newTypeError("Expected number or symbol type for enum field.");
+                }
+                if (val == null) {
+                    throw runtime.newRangeError("Enum value " + value + " is not found.");
+                }
+                break;
+            default:
+                break;
+        }
+        return val;
+    }
+
+    private IRubyObject wrapField(ThreadContext context, Descriptors.FieldDescriptor fieldDescriptor, Object value) {
+        if (value == null) {
+            return context.runtime.getNil();
+        }
+        Ruby runtime = context.runtime;
+        switch (fieldDescriptor.getType()) {
+            case INT32:
+            case INT64:
+            case UINT32:
+            case UINT64:
+            case FLOAT:
+            case DOUBLE:
+            case BOOL:
+            case BYTES:
+            case STRING:
+                return Utils.wrapPrimaryValue(context, fieldDescriptor.getType(), value);
+            case MESSAGE:
+                RubyClass typeClass = (RubyClass) ((RubyDescriptor) getDescriptorForField(context, fieldDescriptor)).msgclass(context);
+                RubyMessage msg = (RubyMessage) typeClass.newInstance(context, Block.NULL_BLOCK);
+                return msg.buildFrom(context, (DynamicMessage) value);
+            case ENUM:
+                Descriptors.EnumValueDescriptor enumValueDescriptor = (Descriptors.EnumValueDescriptor) value;
+                if (enumValueDescriptor.getIndex() == -1) { // UNKNOWN ENUM VALUE
+                    return runtime.newFixnum(enumValueDescriptor.getNumber());
+                }
+                return runtime.newSymbol(enumValueDescriptor.getName());
+            default:
+                return runtime.newString(value.toString());
+        }
+    }
+
+    private RubyRepeatedField repeatedFieldForFieldDescriptor(ThreadContext context,
+                                                              Descriptors.FieldDescriptor fieldDescriptor) {
+        IRubyObject typeClass = context.runtime.getNilClass();
+
+        IRubyObject descriptor = getDescriptorForField(context, fieldDescriptor);
+        Descriptors.FieldDescriptor.Type type = fieldDescriptor.getType();
+        if (type == Descriptors.FieldDescriptor.Type.MESSAGE) {
+            typeClass = ((RubyDescriptor) descriptor).msgclass(context);
+
+        } else if (type == Descriptors.FieldDescriptor.Type.ENUM) {
+            typeClass = ((RubyEnumDescriptor) descriptor).enummodule(context);
+        }
+        return new RubyRepeatedField(context.runtime, cRepeatedField, type, typeClass);
+    }
+
+    protected IRubyObject getField(ThreadContext context, Descriptors.FieldDescriptor fieldDescriptor) {
+        Descriptors.OneofDescriptor oneofDescriptor = fieldDescriptor.getContainingOneof();
+        if (oneofDescriptor != null) {
+            if (oneofCases.containsKey(oneofDescriptor)) {
+                if (oneofCases.get(oneofDescriptor) != fieldDescriptor)
+                    return context.runtime.getNil();
+                return fields.get(fieldDescriptor);
+            } else {
+                Descriptors.FieldDescriptor oneofCase = builder.getOneofFieldDescriptor(oneofDescriptor);
+                if (oneofCase != fieldDescriptor) return context.runtime.getNil();
+                IRubyObject value = wrapField(context, oneofCase, builder.getField(oneofCase));
+                fields.put(fieldDescriptor, value);
+                return value;
+            }
+        }
+
+        if (Utils.isMapEntry(fieldDescriptor)) {
+            RubyMap map = maps.get(fieldDescriptor);
+            if (map == null) {
+                map = newMapForField(context, fieldDescriptor);
+                int mapSize = this.builder.getRepeatedFieldCount(fieldDescriptor);
+                Descriptors.FieldDescriptor keyField = fieldDescriptor.getMessageType().findFieldByNumber(1);
+                Descriptors.FieldDescriptor valueField = fieldDescriptor.getMessageType().findFieldByNumber(2);
+                RubyDescriptor kvDescriptor = (RubyDescriptor) getDescriptorForField(context, fieldDescriptor);
+                RubyClass kvClass = (RubyClass) kvDescriptor.msgclass(context);
+                for (int i = 0; i < mapSize; i++) {
+                    RubyMessage kvMessage = (RubyMessage) kvClass.newInstance(context, Block.NULL_BLOCK);
+                    DynamicMessage message = (DynamicMessage) this.builder.getRepeatedField(fieldDescriptor, i);
+                    kvMessage.buildFrom(context, message);
+                    map.indexSet(context, kvMessage.getField(context, keyField), kvMessage.getField(context, valueField));
+                }
+                maps.put(fieldDescriptor, map);
+            }
+            return map;
+        }
+        if (fieldDescriptor.isRepeated()) {
+            return getRepeatedField(context, fieldDescriptor);
+        }
+        if (fieldDescriptor.getType() != Descriptors.FieldDescriptor.Type.MESSAGE ||
+                this.builder.hasField(fieldDescriptor) || fields.containsKey(fieldDescriptor)) {
+            if (fields.containsKey(fieldDescriptor)) {
+                return fields.get(fieldDescriptor);
+            } else {
+                IRubyObject value = wrapField(context, fieldDescriptor, this.builder.getField(fieldDescriptor));
+                if (this.builder.hasField(fieldDescriptor)) {
+                    fields.put(fieldDescriptor, value);
+                }
+                return value;
+            }
+        }
+        return context.runtime.getNil();
+    }
+
+    protected IRubyObject setField(ThreadContext context, Descriptors.FieldDescriptor fieldDescriptor, IRubyObject value) {
+        if (Utils.isMapEntry(fieldDescriptor)) {
+            if (!(value instanceof RubyMap)) {
+                throw context.runtime.newTypeError("Expected Map instance");
+            }
+            RubyMap thisMap = (RubyMap) getField(context, fieldDescriptor);
+            thisMap.mergeIntoSelf(context, value);
+        } else if (fieldDescriptor.isRepeated()) {
+            checkRepeatedFieldType(context, value, fieldDescriptor);
+            if (value instanceof RubyRepeatedField) {
+                addRepeatedField(fieldDescriptor, (RubyRepeatedField) value);
+            } else {
+                RubyArray ary = value.convertToArray();
+                RubyRepeatedField repeatedField = rubyToRepeatedField(context, fieldDescriptor, ary);
+                addRepeatedField(fieldDescriptor, repeatedField);
+            }
+        } else {
+            Descriptors.OneofDescriptor oneofDescriptor = fieldDescriptor.getContainingOneof();
+            if (oneofDescriptor != null) {
+                Descriptors.FieldDescriptor oneofCase = oneofCases.get(oneofDescriptor);
+                if (oneofCase != null && oneofCase != fieldDescriptor) {
+                    fields.remove(oneofCase);
+                }
+                if (value.isNil()) {
+                    oneofCases.remove(oneofDescriptor);
+                    fields.remove(fieldDescriptor);
+                } else {
+                    oneofCases.put(oneofDescriptor, fieldDescriptor);
+                    fields.put(fieldDescriptor, value);
+                }
+            } else {
+                Descriptors.FieldDescriptor.Type fieldType = fieldDescriptor.getType();
+                IRubyObject typeClass = context.runtime.getObject();
+                boolean addValue = true;
+                if (fieldType == Descriptors.FieldDescriptor.Type.MESSAGE) {
+                    typeClass = ((RubyDescriptor) getDescriptorForField(context, fieldDescriptor)).msgclass(context);
+                    if (value.isNil()){
+                        addValue = false;
+                    }
+                } else if (fieldType == Descriptors.FieldDescriptor.Type.ENUM) {
+                    typeClass = ((RubyEnumDescriptor) getDescriptorForField(context, fieldDescriptor)).enummodule(context);
+                    Descriptors.EnumDescriptor enumDescriptor = fieldDescriptor.getEnumType();
+                    if (Utils.isRubyNum(value)) {
+                        Descriptors.EnumValueDescriptor val =
+                                enumDescriptor.findValueByNumberCreatingIfUnknown(RubyNumeric.num2int(value));
+                        if (val.getIndex() != -1) value = context.runtime.newSymbol(val.getName());
+                    }
+                }
+                if (addValue) {
+                    Utils.checkType(context, fieldType, value, (RubyModule) typeClass);
+                    this.fields.put(fieldDescriptor, value);
+                } else {
+                    this.fields.remove(fieldDescriptor);
+                }
+            }
+        }
+        return context.runtime.getNil();
+    }
+
+    private String layoutInspect() {
+        ThreadContext context = getRuntime().getCurrentContext();
+        StringBuilder sb = new StringBuilder();
+        for (Descriptors.FieldDescriptor fdef : descriptor.getFields()) {
+            sb.append(Utils.unescapeIdentifier(fdef.getName()));
+            sb.append(": ");
+            sb.append(getField(context, fdef).inspect());
+            sb.append(", ");
+        }
+        return sb.substring(0, sb.length() - 2);
+    }
+
+    private IRubyObject getDescriptorForField(ThreadContext context, Descriptors.FieldDescriptor fieldDescriptor) {
+        RubyDescriptor thisRbDescriptor = (RubyDescriptor) getDescriptor(context, metaClass);
+        return thisRbDescriptor.lookup(fieldDescriptor.getName()).getSubType(context);
+    }
+
+    private RubyRepeatedField rubyToRepeatedField(ThreadContext context,
+                                                  Descriptors.FieldDescriptor fieldDescriptor, IRubyObject value) {
+        RubyArray arr = value.convertToArray();
+        RubyRepeatedField repeatedField = repeatedFieldForFieldDescriptor(context, fieldDescriptor);
+        for (int i = 0; i < arr.size(); i++) {
+            repeatedField.push(context, arr.eltInternal(i));
+        }
+        return repeatedField;
+    }
+
+    private RubyMap newMapForField(ThreadContext context, Descriptors.FieldDescriptor fieldDescriptor) {
+        RubyDescriptor mapDescriptor = (RubyDescriptor) getDescriptorForField(context, fieldDescriptor);
+        Descriptors.FieldDescriptor keyField = fieldDescriptor.getMessageType().findFieldByNumber(1);
+        Descriptors.FieldDescriptor valueField = fieldDescriptor.getMessageType().findFieldByNumber(2);
+        IRubyObject keyType = RubySymbol.newSymbol(context.runtime, keyField.getType().name());
+        IRubyObject valueType = RubySymbol.newSymbol(context.runtime, valueField.getType().name());
+        if (valueField.getType() == Descriptors.FieldDescriptor.Type.MESSAGE) {
+            RubyFieldDescriptor rubyFieldDescriptor = (RubyFieldDescriptor) mapDescriptor.lookup(context,
+                    context.runtime.newString("value"));
+            RubyDescriptor rubyDescriptor = (RubyDescriptor) rubyFieldDescriptor.getSubType(context);
+            return (RubyMap) cMap.newInstance(context, keyType, valueType,
+                    rubyDescriptor.msgclass(context), Block.NULL_BLOCK);
+        } else {
+            return (RubyMap) cMap.newInstance(context, keyType, valueType, Block.NULL_BLOCK);
+        }
+    }
+
+    private Descriptors.FieldDescriptor getOneofCase(Descriptors.OneofDescriptor oneof) {
+        if (oneofCases.containsKey(oneof)) {
+            return oneofCases.get(oneof);
+        }
+        return builder.getOneofFieldDescriptor(oneof);
+    }
+
+    private Descriptors.Descriptor descriptor;
+    private DynamicMessage.Builder builder;
+    private RubyClass cRepeatedField;
+    private RubyClass cMap;
+    private Map<Descriptors.FieldDescriptor, RubyRepeatedField> repeatedFields;
+    private Map<Descriptors.FieldDescriptor, RubyMap> maps;
+    private Map<Descriptors.FieldDescriptor, IRubyObject> fields;
+    private Map<Descriptors.OneofDescriptor, Descriptors.FieldDescriptor> oneofCases;
+
+    private static final int SINK_MAXIMUM_NESTING = 64;
+}