react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/PromiseImpl.java

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

/**
 * Implementation of two javascript functions that can be used to resolve or reject a js promise.
 */
package com.facebook.react.bridge;

import javax.annotation.Nullable;

public class PromiseImpl implements Promise {

  private static final String DEFAULT_ERROR = "EUNSPECIFIED";

  private @Nullable Callback mResolve;
  private @Nullable Callback mReject;

  public PromiseImpl(@Nullable Callback resolve, @Nullable Callback reject) {
    mResolve = resolve;
    mReject = reject;
  }

  @Override
  public void resolve(Object value) {
    if (mResolve != null) {
      mResolve.invoke(value);
    }
  }

  @Override
  public void reject(String code, String message) {
    reject(code, message, /*Throwable*/null);
  }

  @Override
  @Deprecated
  public void reject(String message) {
    reject(DEFAULT_ERROR, message, /*Throwable*/null);
  }

  @Override
  public void reject(String code, Throwable e) {
    reject(code, e.getMessage(), e);
  }

  @Override
  public void reject(Throwable e) {
    reject(DEFAULT_ERROR, e.getMessage(), e);
  }

  @Override
  public void reject(String code, String message, @Nullable Throwable e) {
    if (mReject != null) {
      if (code == null) {
        code = DEFAULT_ERROR;
      }
      // The JavaScript side expects a map with at least the error message.
      // It is possible to expose all kind of information. It will be available on the JS
      // error instance.
      WritableNativeMap errorInfo = new WritableNativeMap();
      errorInfo.putString("code", code);
      errorInfo.putString("message", message);
      // TODO(8850038): add the stack trace info in, need to figure out way to serialize that
      mReject.invoke(errorInfo);
    }
  }
}