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
  // 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.util.Map;
  
  interface MapFieldSchema {
    /** Returns the map data for mutation. */
    Map<?, ?> forMutableMapData(Object mapField);
  
    /** Returns the map data for read. */
    Map<?, ?> forMapData(Object mapField);
  
    /** Whether toImmutable() has been called on this map field. */
    boolean isImmutable(Object mapField);
  
    /**
     * Returns an immutable instance of the map field. It may make the parameter immutable and return
     * the parameter, or create an immutable copy. The status of the parameter after the call is
     * undefined.
     */
    Object toImmutable(Object mapField);
  
    /** Returns a new instance of the map field given a map default entry. */
    Object newMapField(Object mapDefaultEntry);
  
    /** Returns the metadata from a default entry. */
    MapEntryLite.Metadata<?, ?> forMapMetadata(Object mapDefaultEntry);
  
    /** Merges {@code srcMapField} into {@code destMapField}, and returns the merged instance. */
    Object mergeFrom(Object destMapField, Object srcMapField);
  
    /** Compute the serialized size for the map with a given field number. */
    int getSerializedSize(int fieldNumber, Object mapField, Object mapDefaultEntry);
  }
  