content: /*
   * Copyright (C) 2017 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.google.android.apps.common.testing.broker;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  import static com.google.common.io.Closeables.close;
  import static com.google.common.io.Closeables.closeQuietly;
  
  import com.google.android.apps.common.testing.broker.DeviceBrokerAnnotations.TestTempDir;
  import com.google.common.io.ByteStreams;
  import com.google.inject.Provider;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import javax.inject.Inject;
  
  /**
   * A temporary work around to load resources before each test.
   *
   * TODO: This should be moved into bazel as an implicit dependency of all tests and
   * automatically included in the apks_to_install flag.
   */
  class ResourceProvider implements Provider<String> {
    private final Provider<String> resourcePathProvider;
  
    @Inject
    @TestTempDir private File tempDir;
    private String resourceOnFileSystemLocation;
  
    ResourceProvider(File tempDir, Provider<String> resourcePathProvider) {
      this.tempDir = tempDir;
      this.resourcePathProvider = resourcePathProvider;
    }
  
    ResourceProvider(Provider<String> resourcePathProvider) {
      this(null, checkNotNull(resourcePathProvider));
    }
  
    @Override
    public synchronized String get() {
      if (null == resourceOnFileSystemLocation) {
        String resourcePath = resourcePathProvider.get();
        File resourceInFs = new File(tempDir, resourcePath);
        if (!resourceInFs.exists()) {
          resourceInFs.getParentFile().mkdirs();
          InputStream in = null;
          OutputStream out = null;
          try {
            in = getClass().getResourceAsStream(resourcePath);
            out = new FileOutputStream(resourceInFs);
            ByteStreams.copy(in, out);
          } catch (IOException ioe) {
            throw new RuntimeException(ioe);
          } finally {
            closeQuietly(in);
            try {
              close(out, true);
            } catch (IOException e) {
              // Exception logged as Level.WARNING by close()
            }
          }
        }
        resourceInFs.setExecutable(true);
        resourceOnFileSystemLocation = resourceInFs.getPath();
      }
      return resourceOnFileSystemLocation;
    }
  }
  