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Immutable objects processor, new generation
There is a newer version: 2.2.8
/*
   Copyright 2015 Immutables Authors and Contributors

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */
package org.immutables.value.processor;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.immutables.generator.Generator;
import org.immutables.value.Value;
import org.immutables.value.processor.meta.Proto.AbstractDeclaring;
import org.immutables.value.processor.meta.Proto.DeclaringType;
import org.immutables.value.processor.meta.Proto.Protoclass;
import org.immutables.value.processor.meta.ValueAttribute;
import org.immutables.value.processor.meta.ValueType;

@Generator.Template
abstract class Gsons extends ValuesTemplate {

  final String gson = System.getProperty("gson.prefix", "com.google.gson");

  @Value.Immutable
  public interface TypeAdapterTypes {
    AbstractDeclaring definedBy();

    String packageGenerated();

    List types();
  }

  public Iterable typeAdapters() {
    Multimap byDeclaring = HashMultimap.create();
    for (ValueType value : values().values()) {
      Protoclass protoclass = value.constitution.protoclass();
      if (protoclass.kind().isValue()) {
        Optional typeAdaptersProvider = protoclass.typeAdaptersProvider();
        if (typeAdaptersProvider.isPresent()) {
          byDeclaring.put(typeAdaptersProvider.get(), value);
        } else if (protoclass.gsonTypeAdapters().isPresent()
            && protoclass.declaringType().isPresent()) {
          DeclaringType topLevel = protoclass.declaringType().get().associatedTopLevel();
          byDeclaring.put(topLevel, value);
        }
      }
    }

    ImmutableList.Builder builder = ImmutableList.builder();
    for (Entry> entry : byDeclaring.asMap().entrySet()) {
      String pack = Iterables.get(entry.getValue(), 0).$$package();
      builder.add(ImmutableTypeAdapterTypes.builder()
          .definedBy(entry.getKey())
          .packageGenerated(pack)
          .addAllTypes(entry.getValue())
          .build());
    }

    return builder.build();
  }

  @Generator.Typedef
  Multimap> Mm;

  @Generator.Typedef
  Map.Entry Nv;

  // Uhh that's ugly )))
  public final Function, Multimap>> byFirstCharacter =
      new Function, Multimap>>() {
        @Override
        public Multimap> apply(Iterable attributes) {
          ImmutableMultimap.Builder> builder = ImmutableMultimap.builder();

          for (ValueAttribute attribute : attributes) {
            String serializedName = attribute.getMarshaledName();
            builder.put(serializedName.charAt(0), Maps.immutableEntry(serializedName, attribute));

            for (String alternateName : attribute.getAlternateSerializedNames()) {
              if (!alternateName.isEmpty()) {
                builder.put(alternateName.charAt(0), Maps.immutableEntry(alternateName, attribute));
              }
            }
          }

          return builder.build();
        }
      };
}