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 com.google.protobuf.MapEntryLite.Metadata;
  import java.util.Map;
  
  class MapFieldSchemaLite implements MapFieldSchema {
  
    @Override
    public Map<?, ?> forMutableMapData(Object mapField) {
      return (MapFieldLite<?, ?>) mapField;
    }
  
    @Override
    public Metadata<?, ?> forMapMetadata(Object mapDefaultEntry) {
      return ((MapEntryLite<?, ?>) mapDefaultEntry).getMetadata();
    }
  
    @Override
    public Map<?, ?> forMapData(Object mapField) {
      return (MapFieldLite<?, ?>) mapField;
    }
  
    @Override
    public boolean isImmutable(Object mapField) {
      return !((MapFieldLite<?, ?>) mapField).isMutable();
    }
  
    @Override
    public Object toImmutable(Object mapField) {
      ((MapFieldLite<?, ?>) mapField).makeImmutable();
      return mapField;
    }
  
    @Override
    public Object newMapField(Object unused) {
      return MapFieldLite.emptyMapField().mutableCopy();
    }
  
    @Override
    public Object mergeFrom(Object destMapField, Object srcMapField) {
      return mergeFromLite(destMapField, srcMapField);
    }
  
    @SuppressWarnings("unchecked")
    private static <K, V> MapFieldLite<K, V> mergeFromLite(Object destMapField, Object srcMapField) {
      MapFieldLite<K, V> mine = (MapFieldLite<K, V>) destMapField;
      MapFieldLite<K, V> other = (MapFieldLite<K, V>) srcMapField;
      if (!other.isEmpty()) {
        if (!mine.isMutable()) {
          mine = mine.mutableCopy();
        }
        mine.mergeFrom(other);
      }
      return mine;
    }
  
    @Override
    public int getSerializedSize(int fieldNumber, Object mapField, Object mapDefaultEntry) {
      return getSerializedSizeLite(fieldNumber, mapField, mapDefaultEntry);
    }
  
    @SuppressWarnings("unchecked")
    private static <K, V> int getSerializedSizeLite(
        int fieldNumber, Object mapField, Object defaultEntry) {
      MapFieldLite<K, V> mapFieldLite = (MapFieldLite<K, V>) mapField;
      MapEntryLite<K, V> defaultEntryLite = (MapEntryLite<K, V>) defaultEntry;
  
      if (mapFieldLite.isEmpty()) {
        return 0;
      }
      int size = 0;
      for (Map.Entry<K, V> entry : mapFieldLite.entrySet()) {
        size += defaultEntryLite.computeMessageSize(fieldNumber, entry.getKey(), entry.getValue());
      }
      return size;
    }
  }
  