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A fast dependency injector for Android and Java.

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/*
 * Copyright (C) 2017 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 com.squareup.javapoet.ClassName;
import dagger.internal.codegen.binding.ComponentDescriptor.ComponentMethodDescriptor;
import dagger.internal.codegen.javapoet.Expression;

/** A factory of code expressions used to access a single request for a binding in a component. */
// TODO(bcorso): Rename this to RequestExpression?
abstract class RequestRepresentation {

  /**
   * Returns an expression that evaluates to the value of a request based on the given requesting
   * class.
   *
   * @param requestingClass the class that will contain the expression
   */
  abstract Expression getDependencyExpression(ClassName requestingClass);

  /**
   * Equivalent to {@link #getDependencyExpression} that is used only when the request is for an
   * implementation of a component method. By default, just delegates to {@link
   * #getDependencyExpression}.
   */
  Expression getDependencyExpressionForComponentMethod(
      ComponentMethodDescriptor componentMethod, ComponentImplementation component) {
    return getDependencyExpression(component.name());
  }
}