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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.BindingRequest.bindingRequest;

import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.CodeBlock;
import dagger.assisted.Assisted;
import dagger.assisted.AssistedFactory;
import dagger.assisted.AssistedInject;
import dagger.internal.codegen.binding.ContributionBinding;
import dagger.internal.codegen.binding.FrameworkType;
import dagger.internal.codegen.javapoet.TypeNames;
import dagger.internal.codegen.writing.FrameworkFieldInitializer.FrameworkInstanceCreationExpression;
import dagger.producers.Producer;
import dagger.spi.model.RequestKind;
import java.util.Optional;

/** An {@link Producer} creation expression for provision bindings. */
final class ProducerFromProviderCreationExpression implements FrameworkInstanceCreationExpression {
  private final ContributionBinding binding;
  private final ComponentImplementation componentImplementation;
  private final ComponentBindingExpressions componentBindingExpressions;

  @AssistedInject
  ProducerFromProviderCreationExpression(
      @Assisted ContributionBinding binding,
      ComponentImplementation componentImplementation,
      ComponentBindingExpressions componentBindingExpressions) {
    this.binding = checkNotNull(binding);
    this.componentImplementation = componentImplementation;
    this.componentBindingExpressions = componentBindingExpressions;
  }

  @Override
  public CodeBlock creationExpression() {
    return FrameworkType.PROVIDER.to(
        RequestKind.PRODUCER,
        componentBindingExpressions
            .getDependencyExpression(
                bindingRequest(binding.key(), FrameworkType.PROVIDER),
                componentImplementation.shardImplementation(binding).name())
            .codeBlock());
  }

  @Override
  public Optional alternativeFrameworkClass() {
    return Optional.of(TypeNames.PRODUCER);
  }

  @AssistedFactory
  static interface Factory {
    ProducerFromProviderCreationExpression create(ContributionBinding binding);
  }

  // TODO(ronshapiro): should this have a simple factory if the delegate expression is simple?
}