Class InjectionRequest

core/src/com/google/inject/spi/InjectionRequest.java:38–105

A request to inject the instance fields and methods of an instance. Requests are created explicitly in a module using com.google.inject.Binder#requestInjection(Object) requestInjection() statements: requestInjection(serviceInstance); @author mikeward@google.com (Mike Ward)

 * @since 2.0
 */
public final class InjectionRequest<T> implements Element {

  private final Object source;
  private final TypeLiteral<T> type;
  private final T instance;

  public InjectionRequest(Object source, TypeLiteral<T> type, T instance) {
    this.source = checkNotNull(source, "source");
    this.type = checkNotNull(type, "type");
    this.instance = instance;
  }

  @Override
  public Object getSource() {
    return source;
  }

  /**
   * Returns the instance that injection is being requested on. This may be null for injection
   * requests returned from an Injector, to allow the injector to reclaim memory.
   */
  public T getInstance() {
    return instance;
  }

  public TypeLiteral<T> getType() {
    return type;
  }

  /**
   * Returns the instance methods and fields of {@code instance} that will be injected to fulfill
   * this request.
   *
   * @return a possibly empty set of injection points. The set has a specified iteration order. All
   *     fields are returned and then all methods. Within the fields, supertype fields are returned
   *     before subtype fields. Similarly, supertype methods are returned before subtype methods.
   * @throws ConfigurationException if there is a malformed injection point on the class of {@code
   *     instance}, such as a field with multiple binding annotations. The exception's {@link
   *     ConfigurationException#getPartialValue() partial value} is a {@code Set<InjectionPoint>} of
   *     the valid injection points.
   */
  public Set<InjectionPoint> getInjectionPoints() throws ConfigurationException {
    return InjectionPoint.forInstanceMethodsAndFields(type);
  }

  @Override
  public <R> R acceptVisitor(ElementVisitor<R> visitor) {
    return visitor.visit(this);
  }

  @Override
  public void applyTo(Binder binder) {
    binder.withSource(getSource()).requestInjection(type, instance);
  }

  @Override
  public boolean equals(Object obj) {
    return obj instanceof InjectionRequest