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A framework for building native apps with React
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/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

package com.facebook.react;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import com.facebook.react.bridge.ModuleSpec;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.module.model.ReactModuleInfoProvider;
import com.facebook.react.uimanager.ViewManager;
import com.facebook.systrace.Systrace;
import com.facebook.systrace.SystraceMessage;

import static com.facebook.systrace.Systrace.TRACE_TAG_REACT_JAVA_BRIDGE;

/**
 * React package supporting lazy creation of native modules.
 *
 * TODO(t11394819): Make this default and deprecate ReactPackage
 */
public abstract class LazyReactPackage implements ReactPackage {

  public static ReactModuleInfoProvider getReactModuleInfoProviderViaReflection(
      LazyReactPackage lazyReactPackage) {
    Class reactModuleInfoProviderClass;
    try {
      reactModuleInfoProviderClass = Class.forName(
          lazyReactPackage.getClass().getCanonicalName() + "$$ReactModuleInfoProvider");
    } catch (ClassNotFoundException e) {
      throw new RuntimeException(e);
    }

    if (reactModuleInfoProviderClass == null) {
      throw new RuntimeException("ReactModuleInfoProvider class for " +
          lazyReactPackage.getClass().getCanonicalName() + " not found.");
    }

    try {
      return (ReactModuleInfoProvider) reactModuleInfoProviderClass.newInstance();
    } catch (InstantiationException e) {
      throw new RuntimeException(
          "Unable to instantiate ReactModuleInfoProvider for " + lazyReactPackage.getClass(),
          e);
    } catch (IllegalAccessException e) {
      throw new RuntimeException(
          "Unable to instantiate ReactModuleInfoProvider for " + lazyReactPackage.getClass(),
          e);
    }
  }

  /**
   * @param reactContext react application context that can be used to create modules
   * @return list of module specs that can create the native modules
   */
  public abstract List getNativeModules(
    ReactApplicationContext reactContext);

  @Override
  public final List createNativeModules(ReactApplicationContext reactContext) {
    List modules = new ArrayList<>();
    for (ModuleSpec holder : getNativeModules(reactContext)) {
      SystraceMessage.beginSection(TRACE_TAG_REACT_JAVA_BRIDGE, "createNativeModule")
        .arg("module", holder.getType())
        .flush();
      try {
        modules.add(holder.getProvider().get());
      } finally {
        Systrace.endSection(TRACE_TAG_REACT_JAVA_BRIDGE);
      }
    }
    return modules;
  }

  /**
   * @param reactContext react application context that can be used to create View Managers.
   * @return list of module specs that can create the View Managers.
   */
  public List getViewManagers(ReactApplicationContext reactContext) {
    return Collections.emptyList();
  }

  @Override
  public List createViewManagers(ReactApplicationContext reactContext) {
    List viewManagerModuleSpecs = getViewManagers(reactContext);
    if (viewManagerModuleSpecs == null || viewManagerModuleSpecs.isEmpty()) {
      return Collections.emptyList();
    }

    List viewManagers = new ArrayList<>();
    for (ModuleSpec moduleSpec : viewManagerModuleSpecs) {
      viewManagers.add((ViewManager) moduleSpec.getProvider().get());
    }
    return viewManagers;
  }

  public abstract ReactModuleInfoProvider getReactModuleInfoProvider();
}