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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 static dagger.internal.codegen.javapoet.CodeBlocks.anonymousProvider;
import static dagger.spi.model.RequestKind.INSTANCE;

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.BindingRequest;
import dagger.internal.codegen.binding.ContributionBinding;
import dagger.internal.codegen.javapoet.Expression;
import dagger.internal.codegen.writing.FrameworkFieldInitializer.FrameworkInstanceCreationExpression;

/**
 * A {@link javax.inject.Provider} creation expression for an anonymous inner class whose
 * {@code get()} method returns the expression for an instance binding request for its key.
 */
final class AnonymousProviderCreationExpression
    implements FrameworkInstanceCreationExpression {
  private final ContributionBinding binding;
  private final ComponentRequestRepresentations componentRequestRepresentations;
  private final ClassName requestingClass;

  @AssistedInject
  AnonymousProviderCreationExpression(
      @Assisted ContributionBinding binding,
      ComponentRequestRepresentations componentRequestRepresentations,
      ComponentImplementation componentImplementation) {
    this.binding = checkNotNull(binding);
    this.componentRequestRepresentations = componentRequestRepresentations;
    this.requestingClass = componentImplementation.name();
  }

  @Override
  public CodeBlock creationExpression() {
    BindingRequest instanceExpressionRequest = bindingRequest(binding.key(), INSTANCE);
    Expression instanceExpression =
        componentRequestRepresentations.getDependencyExpression(
            instanceExpressionRequest,
            // Not a real class name, but the actual requestingClass is an inner class within the
            // given class, not that class itself.
            requestingClass.nestedClass("Anonymous"));
    return anonymousProvider(instanceExpression);
  }

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