root/third_party/protobuf/java/src/main/java/com/google/protobuf/GeneratedMessageLite.java

DEFINITIONS

1. getParserForType
2. parseUnknownField
3. makeExtensionsImmutable
4. SuppressWarnings
5. clear
6. clone
7. mergeFrom
8. getDefaultInstanceForType
9. parseUnknownField
10. hasExtension
11. getExtensionCount
12. getExtension
13. getExtension
14. verifyExtensionContainingType
15. hasExtension
16. getExtensionCount
17. SuppressWarnings
18. getExtension
19. SuppressWarnings
20. getExtension
21. extensionsAreInitialized
22. parseUnknownField
23. makeExtensionsImmutable
24. writeUntil
25. newExtensionWriter
26. newMessageSetExtensionWriter
27. extensionsSerializedSize
28. extensionsSerializedSizeAsMessageSet
29. SuppressWarnings
30. clear
31. ensureExtensionsIsMutable
32. buildExtensions
33. verifyExtensionContainingType
34. hasExtension
35. getExtensionCount
36. SuppressWarnings
37. getExtension
38. SuppressWarnings
39. getExtension
40. clone
41. setExtension
42. setExtension
43. addExtension
44. clearExtension
45. extensionsAreInitialized
46. parseUnknownField
47. mergeExtensionFields
48. parseUnknownField
49. newSingularGeneratedExtension
50. newRepeatedGeneratedExtension
51. getNumber
52. getLiteType
53. getLiteJavaType
54. isRepeated
55. isPacked
56. getEnumType
57. SuppressWarnings
58. internalMergeFrom
59. compareTo
60. getContainingTypeDefaultInstance
61. getNumber
62. getMessageDefaultInstance
63. SuppressWarnings
64. readResolve
65. writeReplace

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// http://code.google.com/p/protobuf/
//
// 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;

import java.io.IOException;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * Lite version of {@link GeneratedMessage}.
 *
 * @author kenton@google.com Kenton Varda
 */
public abstract class GeneratedMessageLite extends AbstractMessageLite
    implements Serializable {
  private static final long serialVersionUID = 1L;

  protected GeneratedMessageLite() {
  }

  protected GeneratedMessageLite(Builder builder) {
  }

  public Parser<? extends MessageLite> getParserForType() {
    throw new UnsupportedOperationException(
        "This is supposed to be overridden by subclasses.");
  }

  /**
   * Called by subclasses to parse an unknown field.
   * @return {@code true} unless the tag is an end-group tag.
   */
  protected boolean parseUnknownField(
      CodedInputStream input,
      ExtensionRegistryLite extensionRegistry,
      int tag) throws IOException {
    return input.skipField(tag);
  }

  /**
   * Used by parsing constructors in generated classes.
   */
  protected void makeExtensionsImmutable() {
    // Noop for messages without extensions.
  }

  @SuppressWarnings("unchecked")
  public abstract static class Builder<MessageType extends GeneratedMessageLite,
                                       BuilderType extends Builder>
      extends AbstractMessageLite.Builder<BuilderType> {
    protected Builder() {}

    //@Override (Java 1.6 override semantics, but we must support 1.5)
    public BuilderType clear() {
      return (BuilderType) this;
    }

    // This is implemented here only to work around an apparent bug in the
    // Java compiler and/or build system.  See bug #1898463.  The mere presence
    // of this dummy clone() implementation makes it go away.
    @Override
    public BuilderType clone() {
      throw new UnsupportedOperationException(
          "This is supposed to be overridden by subclasses.");
    }

    /** All subclasses implement this. */
    public abstract BuilderType mergeFrom(MessageType message);

    // Defined here for return type covariance.
    public abstract MessageType getDefaultInstanceForType();

    /**
     * Called by subclasses to parse an unknown field.
     * @return {@code true} unless the tag is an end-group tag.
     */
    protected boolean parseUnknownField(
        CodedInputStream input,
        ExtensionRegistryLite extensionRegistry,
        int tag) throws IOException {
      return input.skipField(tag);
    }
  }

  // =================================================================
  // Extensions-related stuff

  /**
   * Lite equivalent of {@link com.google.protobuf.GeneratedMessage.ExtendableMessageOrBuilder}.
   */
  public interface ExtendableMessageOrBuilder<
      MessageType extends ExtendableMessage> extends MessageLiteOrBuilder {

    /** Check if a singular extension is present. */
    <Type> boolean hasExtension(
        GeneratedExtension<MessageType, Type> extension);

    /** Get the number of elements in a repeated extension. */
    <Type> int getExtensionCount(
        GeneratedExtension<MessageType, List<Type>> extension);

    /** Get the value of an extension. */
    <Type> Type getExtension(GeneratedExtension<MessageType, Type> extension);

    /** Get one element of a repeated extension. */
    <Type> Type getExtension(
        GeneratedExtension<MessageType, List<Type>> extension,
        int index);
  }

  /**
   * Lite equivalent of {@link GeneratedMessage.ExtendableMessage}.
   */
  public abstract static class ExtendableMessage<
        MessageType extends ExtendableMessage<MessageType>>
      extends GeneratedMessageLite
      implements ExtendableMessageOrBuilder<MessageType> {

    private final FieldSet<ExtensionDescriptor> extensions;

    protected ExtendableMessage() {
      this.extensions = FieldSet.newFieldSet();
    }

    protected ExtendableMessage(ExtendableBuilder<MessageType, ?> builder) {
      this.extensions = builder.buildExtensions();
    }

    private void verifyExtensionContainingType(
        final GeneratedExtension<MessageType, ?> extension) {
      if (extension.getContainingTypeDefaultInstance() !=
          getDefaultInstanceForType()) {
        // This can only happen if someone uses unchecked operations.
        throw new IllegalArgumentException(
          "This extension is for a different message type.  Please make " +
          "sure that you are not suppressing any generics type warnings.");
      }
    }

    /** Check if a singular extension is present. */
    //@Override (Java 1.6 override semantics, but we must support 1.5)
    public final <Type> boolean hasExtension(
        final GeneratedExtension<MessageType, Type> extension) {
      verifyExtensionContainingType(extension);
      return extensions.hasField(extension.descriptor);
    }

    /** Get the number of elements in a repeated extension. */
    //@Override (Java 1.6 override semantics, but we must support 1.5)
    public final <Type> int getExtensionCount(
        final GeneratedExtension<MessageType, List<Type>> extension) {
      verifyExtensionContainingType(extension);
      return extensions.getRepeatedFieldCount(extension.descriptor);
    }

    /** Get the value of an extension. */
    //@Override (Java 1.6 override semantics, but we must support 1.5)
    @SuppressWarnings("unchecked")
    public final <Type> Type getExtension(
        final GeneratedExtension<MessageType, Type> extension) {
      verifyExtensionContainingType(extension);
      final Object value = extensions.getField(extension.descriptor);
      if (value == null) {
        return extension.defaultValue;
      } else {
        return (Type) value;
      }
    }

    /** Get one element of a repeated extension. */
    //@Override (Java 1.6 override semantics, but we must support 1.5)
    @SuppressWarnings("unchecked")
    public final <Type> Type getExtension(
        final GeneratedExtension<MessageType, List<Type>> extension,
        final int index) {
      verifyExtensionContainingType(extension);
      return (Type) extensions.getRepeatedField(extension.descriptor, index);
    }

    /** Called by subclasses to check if all extensions are initialized. */
    protected boolean extensionsAreInitialized() {
      return extensions.isInitialized();
    }

    /**
     * Called by subclasses to parse an unknown field or an extension.
     * @return {@code true} unless the tag is an end-group tag.
     */
    @Override
    protected boolean parseUnknownField(
        CodedInputStream input,
        ExtensionRegistryLite extensionRegistry,
        int tag) throws IOException {
      return GeneratedMessageLite.parseUnknownField(
          extensions,
          getDefaultInstanceForType(),
          input,
          extensionRegistry,
          tag);
    }

    /**
     * Used by parsing constructors in generated classes.
     */
    @Override
    protected void makeExtensionsImmutable() {
      extensions.makeImmutable();
    }

    /**
     * Used by subclasses to serialize extensions.  Extension ranges may be
     * interleaved with field numbers, but we must write them in canonical
     * (sorted by field number) order.  ExtensionWriter helps us write
     * individual ranges of extensions at once.
     */
    protected class ExtensionWriter {
      // Imagine how much simpler this code would be if Java iterators had
      // a way to get the next element without advancing the iterator.

      private final Iterator<Map.Entry<ExtensionDescriptor, Object>> iter =
            extensions.iterator();
      private Map.Entry<ExtensionDescriptor, Object> next;
      private final boolean messageSetWireFormat;

      private ExtensionWriter(boolean messageSetWireFormat) {
        if (iter.hasNext()) {
          next = iter.next();
        }
        this.messageSetWireFormat = messageSetWireFormat;
      }

      public void writeUntil(final int end, final CodedOutputStream output)
                             throws IOException {
        while (next != null && next.getKey().getNumber() < end) {
          ExtensionDescriptor extension = next.getKey();
          if (messageSetWireFormat && extension.getLiteJavaType() ==
                  WireFormat.JavaType.MESSAGE &&
              !extension.isRepeated()) {
            output.writeMessageSetExtension(extension.getNumber(),
                                            (MessageLite) next.getValue());
          } else {
            FieldSet.writeField(extension, next.getValue(), output);
          }
          if (iter.hasNext()) {
            next = iter.next();
          } else {
            next = null;
          }
        }
      }
    }

    protected ExtensionWriter newExtensionWriter() {
      return new ExtensionWriter(false);
    }
    protected ExtensionWriter newMessageSetExtensionWriter() {
      return new ExtensionWriter(true);
    }

    /** Called by subclasses to compute the size of extensions. */
    protected int extensionsSerializedSize() {
      return extensions.getSerializedSize();
    }
    protected int extensionsSerializedSizeAsMessageSet() {
      return extensions.getMessageSetSerializedSize();
    }
  }

  /**
   * Lite equivalent of {@link GeneratedMessage.ExtendableBuilder}.
   */
  @SuppressWarnings("unchecked")
  public abstract static class ExtendableBuilder<
        MessageType extends ExtendableMessage<MessageType>,
        BuilderType extends ExtendableBuilder<MessageType, BuilderType>>
      extends Builder<MessageType, BuilderType>
      implements ExtendableMessageOrBuilder<MessageType> {
    protected ExtendableBuilder() {}

    private FieldSet<ExtensionDescriptor> extensions = FieldSet.emptySet();
    private boolean extensionsIsMutable;

    @Override
    public BuilderType clear() {
      extensions.clear();
      extensionsIsMutable = false;
      return super.clear();
    }

    private void ensureExtensionsIsMutable() {
      if (!extensionsIsMutable) {
        extensions = extensions.clone();
        extensionsIsMutable = true;
      }
    }

    /**
     * Called by the build code path to create a copy of the extensions for
     * building the message.
     */
    private FieldSet<ExtensionDescriptor> buildExtensions() {
      extensions.makeImmutable();
      extensionsIsMutable = false;
      return extensions;
    }

    private void verifyExtensionContainingType(
        final GeneratedExtension<MessageType, ?> extension) {
      if (extension.getContainingTypeDefaultInstance() !=
          getDefaultInstanceForType()) {
        // This can only happen if someone uses unchecked operations.
        throw new IllegalArgumentException(
          "This extension is for a different message type.  Please make " +
          "sure that you are not suppressing any generics type warnings.");
      }
    }

    /** Check if a singular extension is present. */
    //@Override (Java 1.6 override semantics, but we must support 1.5)
    public final <Type> boolean hasExtension(
        final GeneratedExtension<MessageType, Type> extension) {
      verifyExtensionContainingType(extension);
      return extensions.hasField(extension.descriptor);
    }

    /** Get the number of elements in a repeated extension. */
    //@Override (Java 1.6 override semantics, but we must support 1.5)
    public final <Type> int getExtensionCount(
        final GeneratedExtension<MessageType, List<Type>> extension) {
      verifyExtensionContainingType(extension);
      return extensions.getRepeatedFieldCount(extension.descriptor);
    }

    /** Get the value of an extension. */
    //@Override (Java 1.6 override semantics, but we must support 1.5)
    @SuppressWarnings("unchecked")
    public final <Type> Type getExtension(
        final GeneratedExtension<MessageType, Type> extension) {
      verifyExtensionContainingType(extension);
      final Object value = extensions.getField(extension.descriptor);
      if (value == null) {
        return extension.defaultValue;
      } else {
        return (Type) value;
      }
    }

    /** Get one element of a repeated extension. */
    @SuppressWarnings("unchecked")
    //@Override (Java 1.6 override semantics, but we must support 1.5)
    public final <Type> Type getExtension(
        final GeneratedExtension<MessageType, List<Type>> extension,
        final int index) {
      verifyExtensionContainingType(extension);
      return (Type) extensions.getRepeatedField(extension.descriptor, index);
    }

    // This is implemented here only to work around an apparent bug in the
    // Java compiler and/or build system.  See bug #1898463.  The mere presence
    // of this dummy clone() implementation makes it go away.
    @Override
    public BuilderType clone() {
      throw new UnsupportedOperationException(
          "This is supposed to be overridden by subclasses.");
    }

    /** Set the value of an extension. */
    public final <Type> BuilderType setExtension(
        final GeneratedExtension<MessageType, Type> extension,
        final Type value) {
      verifyExtensionContainingType(extension);
      ensureExtensionsIsMutable();
      extensions.setField(extension.descriptor, value);
      return (BuilderType) this;
    }

    /** Set the value of one element of a repeated extension. */
    public final <Type> BuilderType setExtension(
        final GeneratedExtension<MessageType, List<Type>> extension,
        final int index, final Type value) {
      verifyExtensionContainingType(extension);
      ensureExtensionsIsMutable();
      extensions.setRepeatedField(extension.descriptor, index, value);
      return (BuilderType) this;
    }

    /** Append a value to a repeated extension. */
    public final <Type> BuilderType addExtension(
        final GeneratedExtension<MessageType, List<Type>> extension,
        final Type value) {
      verifyExtensionContainingType(extension);
      ensureExtensionsIsMutable();
      extensions.addRepeatedField(extension.descriptor, value);
      return (BuilderType) this;
    }

    /** Clear an extension. */
    public final <Type> BuilderType clearExtension(
        final GeneratedExtension<MessageType, ?> extension) {
      verifyExtensionContainingType(extension);
      ensureExtensionsIsMutable();
      extensions.clearField(extension.descriptor);
      return (BuilderType) this;
    }

    /** Called by subclasses to check if all extensions are initialized. */
    protected boolean extensionsAreInitialized() {
      return extensions.isInitialized();
    }

    /**
     * Called by subclasses to parse an unknown field or an extension.
     * @return {@code true} unless the tag is an end-group tag.
     */
    @Override
    protected boolean parseUnknownField(
        CodedInputStream input,
        ExtensionRegistryLite extensionRegistry,
        int tag) throws IOException {
      ensureExtensionsIsMutable();
      return GeneratedMessageLite.parseUnknownField(
          extensions,
          getDefaultInstanceForType(),
          input,
          extensionRegistry,
          tag);
    }

    protected final void mergeExtensionFields(final MessageType other) {
      ensureExtensionsIsMutable();
      extensions.mergeFrom(((ExtendableMessage) other).extensions);
    }
  }

  // -----------------------------------------------------------------

  /**
   * Parse an unknown field or an extension.
   * @return {@code true} unless the tag is an end-group tag.
   */
  private static <MessageType extends MessageLite>
      boolean parseUnknownField(
          FieldSet<ExtensionDescriptor> extensions,
          MessageType defaultInstance,
          CodedInputStream input,
          ExtensionRegistryLite extensionRegistry,
          int tag) throws IOException {
    int wireType = WireFormat.getTagWireType(tag);
    int fieldNumber = WireFormat.getTagFieldNumber(tag);

    GeneratedExtension<MessageType, ?> extension =
      extensionRegistry.findLiteExtensionByNumber(
          defaultInstance, fieldNumber);

    boolean unknown = false;
    boolean packed = false;
    if (extension == null) {
      unknown = true;  // Unknown field.
    } else if (wireType == FieldSet.getWireFormatForFieldType(
                 extension.descriptor.getLiteType(),
                 false  /* isPacked */)) {
      packed = false;  // Normal, unpacked value.
    } else if (extension.descriptor.isRepeated &&
               extension.descriptor.type.isPackable() &&
               wireType == FieldSet.getWireFormatForFieldType(
                 extension.descriptor.getLiteType(),
                 true  /* isPacked */)) {
      packed = true;  // Packed value.
    } else {
      unknown = true;  // Wrong wire type.
    }

    if (unknown) {  // Unknown field or wrong wire type.  Skip.
      return input.skipField(tag);
    }

    if (packed) {
      int length = input.readRawVarint32();
      int limit = input.pushLimit(length);
      if (extension.descriptor.getLiteType() == WireFormat.FieldType.ENUM) {
        while (input.getBytesUntilLimit() > 0) {
          int rawValue = input.readEnum();
          Object value =
              extension.descriptor.getEnumType().findValueByNumber(rawValue);
          if (value == null) {
            // If the number isn't recognized as a valid value for this
            // enum, drop it (don't even add it to unknownFields).
            return true;
          }
          extensions.addRepeatedField(extension.descriptor, value);
        }
      } else {
        while (input.getBytesUntilLimit() > 0) {
          Object value =
            FieldSet.readPrimitiveField(input,
                                        extension.descriptor.getLiteType());
          extensions.addRepeatedField(extension.descriptor, value);
        }
      }
      input.popLimit(limit);
    } else {
      Object value;
      switch (extension.descriptor.getLiteJavaType()) {
        case MESSAGE: {
          MessageLite.Builder subBuilder = null;
          if (!extension.descriptor.isRepeated()) {
            MessageLite existingValue =
                (MessageLite) extensions.getField(extension.descriptor);
            if (existingValue != null) {
              subBuilder = existingValue.toBuilder();
            }
          }
          if (subBuilder == null) {
            subBuilder = extension.messageDefaultInstance.newBuilderForType();
          }
          if (extension.descriptor.getLiteType() ==
              WireFormat.FieldType.GROUP) {
            input.readGroup(extension.getNumber(),
                            subBuilder, extensionRegistry);
          } else {
            input.readMessage(subBuilder, extensionRegistry);
          }
          value = subBuilder.build();
          break;
        }
        case ENUM:
          int rawValue = input.readEnum();
          value = extension.descriptor.getEnumType()
                           .findValueByNumber(rawValue);
          // If the number isn't recognized as a valid value for this enum,
          // drop it.
          if (value == null) {
            return true;
          }
          break;
        default:
          value = FieldSet.readPrimitiveField(input,
              extension.descriptor.getLiteType());
          break;
      }

      if (extension.descriptor.isRepeated()) {
        extensions.addRepeatedField(extension.descriptor, value);
      } else {
        extensions.setField(extension.descriptor, value);
      }
    }

    return true;
  }

  // -----------------------------------------------------------------

  /** For use by generated code only. */
  public static <ContainingType extends MessageLite, Type>
      GeneratedExtension<ContainingType, Type>
          newSingularGeneratedExtension(
              final ContainingType containingTypeDefaultInstance,
              final Type defaultValue,
              final MessageLite messageDefaultInstance,
              final Internal.EnumLiteMap<?> enumTypeMap,
              final int number,
              final WireFormat.FieldType type) {
    return new GeneratedExtension<ContainingType, Type>(
        containingTypeDefaultInstance,
        defaultValue,
        messageDefaultInstance,
        new ExtensionDescriptor(enumTypeMap, number, type,
                                false /* isRepeated */,
                                false /* isPacked */));
  }

  /** For use by generated code only. */
  public static <ContainingType extends MessageLite, Type>
      GeneratedExtension<ContainingType, Type>
          newRepeatedGeneratedExtension(
              final ContainingType containingTypeDefaultInstance,
              final MessageLite messageDefaultInstance,
              final Internal.EnumLiteMap<?> enumTypeMap,
              final int number,
              final WireFormat.FieldType type,
              final boolean isPacked) {
    @SuppressWarnings("unchecked")  // Subclasses ensure Type is a List
    Type emptyList = (Type) Collections.emptyList();
    return new GeneratedExtension<ContainingType, Type>(
        containingTypeDefaultInstance,
        emptyList,
        messageDefaultInstance,
        new ExtensionDescriptor(
            enumTypeMap, number, type, true /* isRepeated */, isPacked));
  }

  private static final class ExtensionDescriptor
      implements FieldSet.FieldDescriptorLite<
        ExtensionDescriptor> {
    private ExtensionDescriptor(
        final Internal.EnumLiteMap<?> enumTypeMap,
        final int number,
        final WireFormat.FieldType type,
        final boolean isRepeated,
        final boolean isPacked) {
      this.enumTypeMap = enumTypeMap;
      this.number = number;
      this.type = type;
      this.isRepeated = isRepeated;
      this.isPacked = isPacked;
    }

    private final Internal.EnumLiteMap<?> enumTypeMap;
    private final int number;
    private final WireFormat.FieldType type;
    private final boolean isRepeated;
    private final boolean isPacked;

    public int getNumber() {
      return number;
    }

    public WireFormat.FieldType getLiteType() {
      return type;
    }

    public WireFormat.JavaType getLiteJavaType() {
      return type.getJavaType();
    }

    public boolean isRepeated() {
      return isRepeated;
    }

    public boolean isPacked() {
      return isPacked;
    }

    public Internal.EnumLiteMap<?> getEnumType() {
      return enumTypeMap;
    }

    @SuppressWarnings("unchecked")
    public MessageLite.Builder internalMergeFrom(
        MessageLite.Builder to, MessageLite from) {
      return ((Builder) to).mergeFrom((GeneratedMessageLite) from);
    }

    public int compareTo(ExtensionDescriptor other) {
      return number - other.number;
    }
  }

  /**
   * Lite equivalent to {@link GeneratedMessage.GeneratedExtension}.
   *
   * Users should ignore the contents of this class and only use objects of
   * this type as parameters to extension accessors and ExtensionRegistry.add().
   */
  public static final class GeneratedExtension<
      ContainingType extends MessageLite, Type> {

    private GeneratedExtension(
        final ContainingType containingTypeDefaultInstance,
        final Type defaultValue,
        final MessageLite messageDefaultInstance,
        final ExtensionDescriptor descriptor) {
      // Defensive checks to verify the correct initialization order of
      // GeneratedExtensions and their related GeneratedMessages.
      if (containingTypeDefaultInstance == null) {
        throw new IllegalArgumentException(
            "Null containingTypeDefaultInstance");
      }
      if (descriptor.getLiteType() == WireFormat.FieldType.MESSAGE &&
          messageDefaultInstance == null) {
        throw new IllegalArgumentException(
            "Null messageDefaultInstance");
      }
      this.containingTypeDefaultInstance = containingTypeDefaultInstance;
      this.defaultValue = defaultValue;
      this.messageDefaultInstance = messageDefaultInstance;
      this.descriptor = descriptor;
    }

    private final ContainingType containingTypeDefaultInstance;
    private final Type defaultValue;
    private final MessageLite messageDefaultInstance;
    private final ExtensionDescriptor descriptor;

    /**
     * Default instance of the type being extended, used to identify that type.
     */
    public ContainingType getContainingTypeDefaultInstance() {
      return containingTypeDefaultInstance;
    }

    /** Get the field number. */
    public int getNumber() {
      return descriptor.getNumber();
    }

    /**
     * If the extension is an embedded message, this is the default instance of
     * that type.
     */
    public MessageLite getMessageDefaultInstance() {
      return messageDefaultInstance;
    }
  }

  /**
   * A serialized (serializable) form of the generated message.  Stores the
   * message as a class name and a byte array.
   */
  static final class SerializedForm implements Serializable {
    private static final long serialVersionUID = 0L;

    private String messageClassName;
    private byte[] asBytes;

    /**
     * Creates the serialized form by calling {@link com.google.protobuf.MessageLite#toByteArray}.
     * @param regularForm the message to serialize
     */
    SerializedForm(MessageLite regularForm) {
      messageClassName = regularForm.getClass().getName();
      asBytes = regularForm.toByteArray();
    }

    /**
     * When read from an ObjectInputStream, this method converts this object
     * back to the regular form.  Part of Java's serialization magic.
     * @return a GeneratedMessage of the type that was serialized
     */
    @SuppressWarnings("unchecked")
    protected Object readResolve() throws ObjectStreamException {
      try {
        Class messageClass = Class.forName(messageClassName);
        Method newBuilder = messageClass.getMethod("newBuilder");
        MessageLite.Builder builder =
            (MessageLite.Builder) newBuilder.invoke(null);
        builder.mergeFrom(asBytes);
        return builder.buildPartial();
      } catch (ClassNotFoundException e) {
        throw new RuntimeException("Unable to find proto buffer class", e);
      } catch (NoSuchMethodException e) {
        throw new RuntimeException("Unable to find newBuilder method", e);
      } catch (IllegalAccessException e) {
        throw new RuntimeException("Unable to call newBuilder method", e);
      } catch (InvocationTargetException e) {
        throw new RuntimeException("Error calling newBuilder", e.getCause());
      } catch (InvalidProtocolBufferException e) {
        throw new RuntimeException("Unable to understand proto buffer", e);
      }
    }
  }

  /**
   * Replaces this object in the output stream with a serialized form.
   * Part of Java's serialization magic.  Generated sub-classes must override
   * this method by calling {@code return super.writeReplace();}
   * @return a SerializedForm of this message
   */
  protected Object writeReplace() throws ObjectStreamException {
    return new SerializedForm(this);
  }
}