Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/java/core/src/main/java/com/google/protobuf/SingleFieldBuilderV3.java

Index: third_party/protobuf/java/core/src/main/java/com/google/protobuf/SingleFieldBuilderV3.java
diff --git a/third_party/protobuf/java/core/src/main/java/com/google/protobuf/SingleFieldBuilderV3.java b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/SingleFieldBuilderV3.java
deleted file mode 100644
index fb1f76a7311e89a4f092f87077be1d6ca5fbc465..0000000000000000000000000000000000000000
--- a/third_party/protobuf/java/core/src/main/java/com/google/protobuf/SingleFieldBuilderV3.java
+++ /dev/null
@@ -1,241 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 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;
-
-/**
- * {@code SingleFieldBuilderV3} implements a structure that a protocol
- * message uses to hold a single field of another protocol message. It supports
- * the classical use case of setting an immutable {@link Message} as the value
- * of the field and is highly optimized around this.
- * <br>
- * It also supports the additional use case of setting a {@link Message.Builder}
- * as the field and deferring conversion of that {@code Builder}
- * to an immutable {@code Message}. In this way, it's possible to maintain
- * a tree of {@code Builder}'s that acts as a fully read/write data
- * structure.
- * <br>
- * Logically, one can think of a tree of builders as converting the entire tree
- * to messages when build is called on the root or when any method is called
- * that desires a Message instead of a Builder. In terms of the implementation,
- * the {@code SingleFieldBuilderV3} and {@code RepeatedFieldBuilderV3}
- * classes cache messages that were created so that messages only need to be
- * created when some change occurred in its builder or a builder for one of its
- * descendants.
- *
- * @param <MType> the type of message for the field
- * @param <BType> the type of builder for the field
- * @param <IType> the common interface for the message and the builder
- *
- * @author jonp@google.com (Jon Perlow)
- */
-public class SingleFieldBuilderV3
-    <MType extends AbstractMessage,
-     BType extends AbstractMessage.Builder,
-     IType extends MessageOrBuilder>
-    implements AbstractMessage.BuilderParent {
-
-  // Parent to send changes to.
-  private AbstractMessage.BuilderParent parent;
-
-  // Invariant: one of builder or message fields must be non-null.
-
-  // If set, this is the case where we are backed by a builder. In this case,
-  // message field represents a cached message for the builder (or null if
-  // there is no cached message).
-  private BType builder;
-
-  // If builder is non-null, this represents a cached message from the builder.
-  // If builder is null, this is the authoritative message for the field.
-  private MType message;
-
-  // Indicates that we've built a message and so we are now obligated
-  // to dispatch dirty invalidations. See AbstractMessage.BuilderListener.
-  private boolean isClean;
-
-  public SingleFieldBuilderV3(
-      MType message,
-      AbstractMessage.BuilderParent parent,
-      boolean isClean) {
-    if (message == null) {
-      throw new NullPointerException();
-    }
-    this.message = message;
-    this.parent = parent;
-    this.isClean = isClean;
-  }
-
-  public void dispose() {
-    // Null out parent so we stop sending it invalidations.
-    parent = null;
-  }
-
-  /**
-   * Get the message for the field. If the message is currently stored
-   * as a {@code Builder}, it is converted to a {@code Message} by
-   * calling {@link Message.Builder#buildPartial} on it. If no message has
-   * been set, returns the default instance of the message.
-   *
-   * @return the message for the field
-   */
-  @SuppressWarnings("unchecked")
-  public MType getMessage() {
-    if (message == null) {
-      // If message is null, the invariant is that we must be have a builder.
-      message = (MType) builder.buildPartial();
-    }
-    return message;
-  }
-
-  /**
-   * Builds the message and returns it.
-   *
-   * @return the message
-   */
-  public MType build() {
-    // Now that build has been called, we are required to dispatch
-    // invalidations.
-    isClean = true;
-    return getMessage();
-  }
-
-  /**
-   * Gets a builder for the field. If no builder has been created yet, a
-   * builder is created on demand by calling {@link Message#toBuilder}.
-   *
-   * @return The builder for the field
-   */
-  @SuppressWarnings("unchecked")
-  public BType getBuilder() {
-    if (builder == null) {
-      // builder.mergeFrom() on a fresh builder
-      // does not create any sub-objects with independent clean/dirty states,
-      // therefore setting the builder itself to clean without actually calling
-      // build() cannot break any invariants.
-      builder = (BType) message.newBuilderForType(this);
-      builder.mergeFrom(message); // no-op if message is the default message
-      builder.markClean();
-    }
-    return builder;
-  }
-
-  /**
-   * Gets the base class interface for the field. This may either be a builder
-   * or a message. It will return whatever is more efficient.
-   *
-   * @return the message or builder for the field as the base class interface
-   */
-  @SuppressWarnings("unchecked")
-  public IType getMessageOrBuilder() {
-    if (builder != null) {
-      return  (IType) builder;
-    } else {
-      return (IType) message;
-    }
-  }
-
-  /**
-   * Sets a  message for the field replacing any existing value.
-   *
-   * @param message the message to set
-   * @return the builder
-   */
-  public SingleFieldBuilderV3<MType, BType, IType> setMessage(
-      MType message) {
-    if (message == null) {
-      throw new NullPointerException();
-    }
-    this.message = message;
-    if (builder != null) {
-      builder.dispose();
-      builder = null;
-    }
-    onChanged();
-    return this;
-  }
-
-  /**
-   * Merges the field from another field.
-   *
-   * @param value the value to merge from
-   * @return the builder
-   */
-  public SingleFieldBuilderV3<MType, BType, IType> mergeFrom(
-      MType value) {
-    if (builder == null && message == message.getDefaultInstanceForType()) {
-      message = value;
-    } else {
-      getBuilder().mergeFrom(value);
-    }
-    onChanged();
-    return this;
-  }
-
-  /**
-   * Clears the value of the field.
-   *
-   * @return the builder
-   */
-  @SuppressWarnings("unchecked")
-  public SingleFieldBuilderV3<MType, BType, IType> clear() {
-    message = (MType) (message != null ?
-        message.getDefaultInstanceForType() :
-        builder.getDefaultInstanceForType());
-    if (builder != null) {
-      builder.dispose();
-      builder = null;
-    }
-    onChanged();
-    return this;
-  }
-
-  /**
-   * Called when a the builder or one of its nested children has changed
-   * and any parent should be notified of its invalidation.
-   */
-  private void onChanged() {
-    // If builder is null, this is the case where onChanged is being called
-    // from setMessage or clear.
-    if (builder != null) {
-      message = null;
-    }
-    if (isClean && parent != null) {
-      parent.markDirty();
-
-      // Don't keep dispatching invalidations until build is called again.
-      isClean = false;
-    }
-  }
-
-  @Override
-  public void markDirty() {
-    onChanged();
-  }
-}