content: // 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
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  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import com.google.protobuf.ArrayDecoders.Registers;
  import java.io.IOException;
  
  /**
   * A runtime schema for a single protobuf message. A schema provides operations on message instances
   * such as serialization/deserialization.
   */
  @ExperimentalApi
  interface Schema<T> {
    /** Writes the given message to the target {@link Writer}. */
    void writeTo(T message, Writer writer) throws IOException;
  
    /**
     * Reads fields from the given {@link Reader} and merges them into the message. It doesn't make
     * the message immutable after parsing is done. To make the message immutable, use {@link
     * #makeImmutable}.
     */
    void mergeFrom(T message, Reader reader, ExtensionRegistryLite extensionRegistry)
        throws IOException;
  
    /**
     * Like the above but parses from a byte[] without extensions. Entry point of fast path. Note that
     * this method may throw IndexOutOfBoundsException if the input data is not valid protobuf wire
     * format. Protobuf public API methods should catch and convert that exception to
     * InvalidProtocolBufferException.
     */
    void mergeFrom(T message, byte[] data, int position, int limit, Registers registers)
        throws IOException;
  
    /** Marks repeated/map/extension/unknown fields as immutable. */
    void makeImmutable(T message);
  
    /** Checks whether all required fields are set. */
    boolean isInitialized(T message);
  
    /** Creates a new instance of the message class. */
    T newInstance();
  
    /** Determine of the two messages are equal. */
    boolean equals(T message, T other);
  
    /** Compute a hashCode for the message. */
    int hashCode(T message);
  
    /**
     * Merge values from {@code other} into {@code message}. This method doesn't make the message
     * immutable. To make the message immutable after merging, use {@link #makeImmutable}.
     */
    void mergeFrom(T message, T other);
  
    /** Compute the serialized size of the message. */
    int getSerializedSize(T message);
  }
  