content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * 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 androidx.test.espresso.web.bridge;
  
  import static androidx.test.internal.util.Checks.checkState;
  
  import androidx.concurrent.futures.ResolvableFuture;
  import java.util.concurrent.atomic.AtomicInteger;
  
  /**
   * Provides a gateway for Java and Javascript code to communicate to eachother.
   */
  public final class JavaScriptBridge {
    private static final AtomicInteger tokenGenerator = new AtomicInteger(0);
    static final String TAG = "JS_BRIDGE";
    static final String JS_BRIDGE_NAME = "__g_wd_jsb";
  
    private static volatile boolean initialized = false;
    private static JavaScriptBoundBridge boundBridge;
  
    /**
     * Creates a Conduit object which allows Java to wrap Javascript code within a handler that will
     * forward evaluation results back to the Java process.
     *
     * <p>Conduits can be used for only 1 evaluation. Creating new ones is relatively cheap.
     */
    public static Conduit makeConduit() {
      checkState(initialized, "Install bridge not called!");
      checkState(null != boundBridge, "Bridge not configured; chromium webviews do not need bridge");
      Conduit conduit =
          new Conduit.Builder()
              .withBridgeName(JS_BRIDGE_NAME)
              .withToken(String.valueOf(tokenGenerator.incrementAndGet()))
              .withSuccessMethod("setResult")
              .withErrorMethod("setError")
              .withJsResult(ResolvableFuture.<String>create())
              .build();
      boundBridge.addConduit(conduit);
      return conduit;
    }
  }
  