本文整理了Java中com.apollographql.apollo.api.internal.Optional.fromNullable()方法的一些代码示例，展示了Optional.fromNullable()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Optional.fromNullable()方法的具体详情如下：
包路径：com.apollographql.apollo.api.internal.Optional
类名称：Optional
方法名：fromNullable

Optional.fromNullable介绍

[英]If nullableReference is non-null, returns an Optional instance containing that reference; otherwise returns Optional#absent.

Comparison to java.util.Optional: this method is equivalent to Java 8's Optional.ofNullable.
[中]如果nullableReference为非null，则返回包含该引用的可选实例；否则返回可选#缺席。
与java的比较。util。可选：此方法相当于Java8的可选方法。完全可以。

代码示例

代码示例来源：origin: apollographql/apollo-android

public InterceptorResponse(okhttp3.Response httpResponse, Response parsedResponse,
   Collection<Record> cacheRecords) {
  this.httpResponse = Optional.fromNullable(httpResponse);
  this.parsedResponse = Optional.fromNullable(parsedResponse);
  this.cacheRecords = Optional.fromNullable(cacheRecords);
 }
}

代码示例来源：origin: apollographql/apollo-android

public Builder optimisticUpdates(Operation.Data optimisticUpdates) {
 this.optimisticUpdates = Optional.fromNullable(optimisticUpdates);
 return this;
}

代码示例来源：origin: apollographql/apollo-android

/**
 * The {@link Logger} to use for logging purposes.
 *
 * @return The {@link Builder} object to be used for chaining method calls
 */
public Builder logger(@Nullable Logger logger) {
 this.logger = Optional.fromNullable(logger);
 return this;
}

代码示例来源：origin: apollographql/apollo-android

@NotNull @Override public Optional<Record> apply(@NotNull NormalizedCache cache) {
  return Optional.fromNullable(cache.loadRecord(key, cacheHeaders));
 }
});

代码示例来源：origin: apollographql/apollo-android

/**
 * Set the configuration to be used for normalized cache.
 *
 * @param normalizedCacheFactory the {@link NormalizedCacheFactory} used to construct a {@link NormalizedCache}.
 * @param keyResolver            the {@link CacheKeyResolver} to use to normalize records
 * @return The {@link Builder} object to be used for chaining method calls
 */
public Builder normalizedCache(@NotNull NormalizedCacheFactory normalizedCacheFactory,
  @NotNull CacheKeyResolver keyResolver) {
 cacheFactory = Optional.fromNullable(checkNotNull(normalizedCacheFactory, "normalizedCacheFactory == null"));
 cacheKeyResolver = Optional.fromNullable(checkNotNull(keyResolver, "cacheKeyResolver == null"));
 return this;
}

代码示例来源：origin: apollographql/apollo-android

synchronized Optional<ApolloCall.Callback<T>> responseCallback() {
 switch (state.get()) {
  case ACTIVE:
  case CANCELED:
   return Optional.fromNullable(originalCallback.get());
  case IDLE:
  case TERMINATED:
   throw new IllegalStateException(
     CallState.IllegalStateMessage.forCurrentState(state.get()).expected(ACTIVE, CANCELED));
  default:
   throw new IllegalStateException("Unknown state");
 }
}

代码示例来源：origin: apollographql/apollo-android

synchronized Optional<Callback<T>> responseCallback() {
 switch (state.get()) {
  case ACTIVE:
  case CANCELED:
   return Optional.fromNullable(originalCallback.get());
  case IDLE:
  case TERMINATED:
   throw new IllegalStateException(
     CallState.IllegalStateMessage.forCurrentState(state.get()).expected(ACTIVE, CANCELED));
  default:
   throw new IllegalStateException("Unknown state");
 }
}

代码示例来源：origin: apollographql/apollo-android

synchronized Optional<Callback<T>> terminate() {
 switch (state.get()) {
  case ACTIVE:
   tracker.unregisterCall(this);
   state.set(TERMINATED);
   return Optional.fromNullable(originalCallback.getAndSet(null));
  case CANCELED:
   return Optional.fromNullable(originalCallback.getAndSet(null));
  case IDLE:
  case TERMINATED:
   throw new IllegalStateException(
     CallState.IllegalStateMessage.forCurrentState(state.get()).expected(ACTIVE, CANCELED));
  default:
   throw new IllegalStateException("Unknown state");
 }
}

代码示例来源：origin: apollographql/apollo-android

synchronized Optional<ApolloPrefetch.Callback> terminate() {
  switch (state.get()) {
   case ACTIVE:
    tracker.unregisterPrefetchCall(this);
    state.set(TERMINATED);
    return Optional.fromNullable(originalCallback.getAndSet(null));
   case CANCELED:
    return Optional.fromNullable(originalCallback.getAndSet(null));
   case IDLE:
   case TERMINATED:
    throw new IllegalStateException(
      CallState.IllegalStateMessage.forCurrentState(state.get()).expected(ACTIVE, CANCELED));
   default:
    throw new IllegalStateException("Unknown state");
  }
 }
}

代码示例来源：origin: apollographql/apollo-android

synchronized Optional<ApolloCall.Callback<T>> terminate() {
 switch (state.get()) {
  case ACTIVE:
   tracker.unregisterQueryWatcher(this);
   state.set(TERMINATED);
   return Optional.fromNullable(originalCallback.getAndSet(null));
  case CANCELED:
   return Optional.fromNullable(originalCallback.getAndSet(null));
  case IDLE:
  case TERMINATED:
   throw new IllegalStateException(
     CallState.IllegalStateMessage.forCurrentState(state.get()).expected(ACTIVE, CANCELED));
  default:
   throw new IllegalStateException("Unknown state");
 }
}

代码示例来源：origin: apollographql/apollo-android

public ApolloHttpCache(@NotNull final HttpCacheStore cacheStore, @Nullable final Logger logger) {
 this.cacheStore = checkNotNull(cacheStore, "cacheStore == null");
 this.logger = new ApolloLogger(Optional.fromNullable(logger));
}

代码示例来源：origin: apollographql/apollo-android

public ApolloServerInterceptor(@NotNull HttpUrl serverUrl, @NotNull Call.Factory httpCallFactory,
  @Nullable HttpCachePolicy.Policy cachePolicy, boolean prefetch,
  @NotNull ScalarTypeAdapters scalarTypeAdapters, @NotNull ApolloLogger logger) {
 this.serverUrl = checkNotNull(serverUrl, "serverUrl == null");
 this.httpCallFactory = checkNotNull(httpCallFactory, "httpCallFactory == null");
 this.cachePolicy = Optional.fromNullable(cachePolicy);
 this.prefetch = prefetch;
 this.scalarTypeAdapters = checkNotNull(scalarTypeAdapters, "scalarTypeAdapters == null");
 this.logger = checkNotNull(logger, "logger == null");
}

代码示例来源：origin: apollographql/apollo-android

private void log(int priority, @NotNull String message, @Nullable Throwable t, Object... args) {
  if (logger.isPresent()) {
   logger.get().log(priority, message, Optional.fromNullable(t), args);
  }
 }
}

代码示例来源：origin: apollographql/apollo-android

@SuppressWarnings("unchecked") private void resolveObjectFields(FieldDescriptor fieldDescriptor,
  Map<String, Object> rawFieldValues, ResolveDelegate<Map<String, Object>> delegate) {
 delegate.willResolveObject(fieldDescriptor.field, Optional.fromNullable(rawFieldValues));
 if (fieldDescriptor.value == null) {
  delegate.didResolveNull();
 } else {
  resolveFields(operationVariables, delegate, (Map<String, FieldDescriptor>) fieldDescriptor.value);
 }
 delegate.didResolveObject(fieldDescriptor.field, Optional.fromNullable(rawFieldValues));
}

代码示例来源：origin: apollographql/apollo-android

@Override
public <D extends Mutation.Data, T, V extends Mutation.Variables> ApolloMutationCall<T> mutate(
  @NotNull Mutation<D, T, V> mutation, @NotNull D withOptimisticUpdates) {
 checkNotNull(withOptimisticUpdates, "withOptimisticUpdate == null");
 return newCall(mutation).toBuilder().responseFetcher(ApolloResponseFetchers.NETWORK_ONLY)
   .optimisticUpdates(Optional.<Operation.Data>fromNullable(withOptimisticUpdates)).build();
}

代码示例来源：origin: apollographql/apollo-android

@Override public ApolloQueryWatcher<T> enqueueAndWatch(@Nullable final ApolloCall.Callback<T> callback) {
 try {
  activate(Optional.fromNullable(callback));
 } catch (ApolloCanceledException e) {
  if (callback != null) {
   callback.onCanceledError(e);
  } else {
   logger.e(e, "Operation: %s was canceled", operation().name().name());
  }
  return this;
 }
 activeCall.enqueue(callbackProxy());
 return this;
}

代码示例来源：origin: apollographql/apollo-android

@Test
public void testFromNullable() {
 Optional<String> optionalName = Optional.fromNullable("bob");
 assertEquals("bob", optionalName.get());
}

代码示例来源：origin: apollographql/apollo-android

@Test
public void testFromNullableNull() {
 // not promised by spec, but easier to test
 assertSame(Optional.absent(), Optional.fromNullable(null));
}

代码示例来源：origin: apollographql/apollo-android

@Override public void enqueue(@Nullable final Callback responseCallback) {
 try {
  activate(Optional.fromNullable(responseCallback));
 } catch (ApolloCanceledException e) {
  if (responseCallback != null) {
   responseCallback.onFailure(e);
  } else {
   logger.e(e, "Operation: %s was canceled", operation().name().name());
  }
  return;
 }
 ApolloInterceptor.InterceptorRequest request = ApolloInterceptor.InterceptorRequest.builder(operation).build();
 interceptorChain.proceedAsync(request, dispatcher, interceptorCallbackProxy());
}

代码示例来源：origin: apollographql/apollo-android

@Override public void enqueue(@Nullable final Callback<T> responseCallback) {
 try {
  activate(Optional.fromNullable(responseCallback));
 } catch (ApolloCanceledException e) {
  if (responseCallback != null) {
   responseCallback.onCanceledError(e);
  } else {
   logger.e(e, "Operation: %s was canceled", operation().name().name());
  }
  return;
 }
 ApolloInterceptor.InterceptorRequest request = ApolloInterceptor.InterceptorRequest.builder(operation)
   .cacheHeaders(cacheHeaders)
   .fetchFromCache(false)
   .optimisticUpdates(optimisticUpdates)
   .build();
 interceptorChain.proceedAsync(request, dispatcher, interceptorCallbackProxy());
}