content: /*
   * Copyright (C) 2018 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 com.android.layout.remote.api;
  
  import com.android.ide.common.rendering.api.ResourceNamespace.Resolver;
  import com.android.ide.common.rendering.api.ResourceValue;
  import com.android.layout.remote.util.RemoteResolverAdapter;
  import com.android.tools.layoutlib.annotations.NotNull;
  import com.android.tools.layoutlib.annotations.Nullable;
  
  import java.io.Serializable;
  import java.rmi.RemoteException;
  
  /**
   * Wrapper for {@link ResourceValue} that can be transferred to a different VM.
   *
   * @param <T> the ResourceValue instance type
   */
  public class RemoteResourceValue<T extends ResourceValue> implements Serializable {
      private static final RemoteResourceValue<ResourceValue> NULL_INSTANCE =
              new RemoteResourceValue<>(null, null);
  
      private final T mResourceValue;
      private final RemoteNamespaceResolver mRemoteResolver;
  
      private RemoteResourceValue(@Nullable T resourceValue,
              @Nullable RemoteNamespaceResolver remoteResolver) {
          mResourceValue = resourceValue;
          mRemoteResolver = remoteResolver;
      }
  
      /**
       * Returns a RemoteResourceValue that wraps the given {@link ResourceValue} instance. The passed
       * resource value can be null.
       */
      @NotNull
      public static <T extends ResourceValue> RemoteResourceValue<T> fromResourceValue(
              T resourceValue) {
          if (resourceValue == null) {
              //noinspection unchecked
              return (RemoteResourceValue<T>) NULL_INSTANCE;
          }
          try {
              return new RemoteResourceValue<>(resourceValue,
                      RemoteResolverAdapter.create(resourceValue.getNamespaceResolver()));
  
          } catch (RemoteException e) {
              throw new RuntimeException(e);
          }
      }
  
      /**
       * Returns the {@link ResourceValue} wrapped by a remote wrapper
       */
      @NotNull
      private static <T extends ResourceValue> T toResourceValue(
              @NotNull RemoteResourceValue<T> remoteResourceValue) {
          T remoteValue = remoteResourceValue.mResourceValue;
          if (remoteValue == null) {
              return null;
          }
  
          // The Resolver is not transferred in the ResourceValue (it's transient) so we use the
          // information in the wrapper to reconstruct it.
          RemoteNamespaceResolver remoteResolver = remoteResourceValue.mRemoteResolver;
  
  //        TODO: Rethink this as setNamespaceResolver is not available in prebuilts any more
  //        if (remoteResolver != null) {
  //            remoteValue.setNamespaceResolver(new Resolver() {
  //                @Override
  //                public String prefixToUri(String namespacePrefix) {
  //                    try {
  //                        return remoteResolver.remotePrefixToUri(namespacePrefix);
  //                    } catch (RemoteException e) {
  //                        throw new RuntimeException(e);
  //                    }
  //                }
  //
  //                @Override
  //                public String uriToPrefix(String namespaceUri) {
  //                    try {
  //                        return remoteResolver.remoteUriToPrefix(namespaceUri);
  //                    } catch (RemoteException e) {
  //                        throw new RuntimeException(e);
  //                    }
  //                }
  //            });
  //        }
  //        else {
  //            remoteValue.setNamespaceResolver(Resolver.EMPTY_RESOLVER);
  //        }
  
          return remoteValue;
      }
  
      /**
       * Returns the {@link ResourceValue} wrapped by this remote wrapper
       */
      @NotNull
      public T toResourceValue() {
          return RemoteResourceValue.toResourceValue(this);
      }
  }
  