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/*
 * Copyright (C) 2014 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.binding;

import com.google.common.collect.ImmutableSet;
import dagger.internal.codegen.model.BindingKind;
import dagger.internal.codegen.model.DependencyRequest;
import dagger.internal.codegen.model.Scope;
import java.util.Optional;

/**
 * An abstract type for classes representing a Dagger binding. Particularly, contains the element
 * that generated the binding and the {@link DependencyRequest} instances that are required to
 * satisfy the binding, but leaves the specifics of the mechanism of the binding to the
 * subtypes.
 */
public abstract class Binding extends BindingDeclaration {

  /**
   * Returns {@code true} if using this binding requires an instance of the {@link
   * #contributingModule()}.
   */
  public abstract boolean requiresModuleInstance();

  /**
   * Returns {@code true} if this binding may provide {@code null} instead of an instance of {@link
   * #key()}. Nullable bindings cannot be requested from {@linkplain DependencyRequest#isNullable()
   * non-nullable dependency requests}.
   */
  public abstract boolean isNullable();

  /** The kind of binding this instance represents. */
  public abstract BindingKind kind();

  /** The {@link BindingType} of this binding. */
  public abstract BindingType bindingType();

  /** The {@link FrameworkType} of this binding. */
  public final FrameworkType frameworkType() {
    return FrameworkType.forBindingType(bindingType());
  }

  /** The set of {@link DependencyRequest dependencies} required to satisfy this binding. */
  public abstract ImmutableSet dependencies();

  /**
   * If this binding's key's type parameters are different from those of the {@link
   * #bindingTypeElement()}, this is the binding for the {@link #bindingTypeElement()}'s unresolved
   * type.
   */
  public abstract Optional unresolved();

  /** Returns the optional scope used on the binding. */
  public abstract Optional scope();
}