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A fast dependency injector for Android and Java.
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/*
 * Copyright (C) 2015 The Dagger Authors.
 *
 * 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 dagger.internal.codegen.writing;

import static com.google.common.base.Preconditions.checkNotNull;
import static dagger.internal.codegen.binding.MapKeys.getLazyClassMapKeyExpression;
import static dagger.internal.codegen.binding.MapKeys.getMapKeyExpression;
import static dagger.internal.codegen.binding.SourceFiles.mapFactoryClassName;

import androidx.room.compiler.codegen.XClassName;
import androidx.room.compiler.codegen.XCodeBlock;
import androidx.room.compiler.codegen.XTypeName;
import androidx.room.compiler.processing.XProcessingEnv;
import dagger.assisted.Assisted;
import dagger.assisted.AssistedFactory;
import dagger.assisted.AssistedInject;
import dagger.internal.codegen.base.MapType;
import dagger.internal.codegen.binding.BindingGraph;
import dagger.internal.codegen.binding.ContributionBinding;
import dagger.internal.codegen.binding.MapKeys;
import dagger.internal.codegen.binding.MultiboundMapBinding;
import dagger.internal.codegen.model.DependencyRequest;
import dagger.internal.codegen.xprocessing.XTypeNames;

/** A factory creation expression for a multibound map. */
final class MapFactoryCreationExpression extends MultibindingFactoryCreationExpression {

  private final XProcessingEnv processingEnv;
  private final ComponentImplementation componentImplementation;
  private final BindingGraph graph;
  private final MultiboundMapBinding binding;
  private final boolean useLazyClassKey;

  @AssistedInject
  MapFactoryCreationExpression(
      @Assisted MultiboundMapBinding binding,
      XProcessingEnv processingEnv,
      ComponentImplementation componentImplementation,
      ComponentRequestRepresentations componentRequestRepresentations,
      BindingGraph graph) {
    super(binding, componentImplementation, componentRequestRepresentations);
    this.processingEnv = processingEnv;
    this.binding = checkNotNull(binding);
    this.componentImplementation = componentImplementation;
    this.graph = graph;
    this.useLazyClassKey = MapKeys.useLazyClassKey(binding, graph);
  }

  @Override
  public XCodeBlock creationExpression() {
    XClassName mapFactoryClassName = mapFactoryClassName(binding);
    XCodeBlock.Builder builder = XCodeBlock.builder().add("%T.", mapFactoryClassName);
    XTypeName valueTypeName = XTypeName.ANY_OBJECT;
    if (!useRawType()) {
      MapType mapType = MapType.from(binding.key());
      valueTypeName = mapType.unwrappedFrameworkValueType().asTypeName();
      builder.add(
          "<%T, %T>",
          useLazyClassKey ? XTypeName.STRING : mapType.keyType().asTypeName(), valueTypeName);
    }

    builder.add("builder(%L)", binding.dependencies().size());

    for (DependencyRequest dependency : binding.dependencies()) {
      ContributionBinding contributionBinding = graph.contributionBinding(dependency.key());
      builder.add(
          ".put(%L, %L)",
          useLazyClassKey
              ? getLazyClassMapKeyExpression(graph.contributionBinding(dependency.key()))
              : getMapKeyExpression(
                  contributionBinding, componentImplementation.name(), processingEnv),
          multibindingDependencyExpression(dependency));
    }

    XCodeBlock creationExpression = builder.add(".build()").build();
    return useLazyClassKey
        ? XCodeBlock.of(
            "%T.<%T>of(%L)", lazyMapFactoryClassName(binding), valueTypeName, creationExpression)
        : creationExpression;
  }

  private static XClassName lazyMapFactoryClassName(MultiboundMapBinding binding) {
    MapType mapType = MapType.from(binding.key());
    switch (binding.bindingType()) {
      case PROVISION:
        return mapType.valuesAreProvider()
            ? XTypeNames.LAZY_CLASS_KEY_MAP_PROVIDER_FACTORY
            : XTypeNames.LAZY_CLASS_KEY_MAP_FACTORY;
      case PRODUCTION:
        return mapType.valuesAreFrameworkType()
            ? mapType.valuesAreTypeOf(XTypeNames.PRODUCER)
                ? XTypeNames.LAZY_MAP_OF_PRODUCER_PRODUCER
                : XTypeNames.LAZY_MAP_OF_PRODUCED_PRODUCER
            : XTypeNames.LAZY_MAP_PRODUCER;
      default:
        throw new IllegalArgumentException(binding.bindingType().toString());
    }
  }

  @AssistedFactory
  static interface Factory {
    MapFactoryCreationExpression create(MultiboundMapBinding binding);
  }
}