content: /*
   * Copyright (C) 2019 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 android.content;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import android.content.res.AssetFileDescriptor;
  import android.database.Cursor;
  import android.database.DatabaseUtils;
  import android.net.Uri;
  import android.os.Binder;
  import android.os.Bundle;
  import android.os.CancellationSignal;
  import android.os.ParcelFileDescriptor;
  import android.os.RemoteException;
  import android.util.Log;
  
  import java.io.FileNotFoundException;
  import java.util.ArrayList;
  import java.util.Arrays;
  
  /**
   * Instance of {@link ContentInterface} that logs all inputs and outputs while
   * delegating to another {@link ContentInterface}.
   *
   * @hide
   */
  public class LoggingContentInterface implements ContentInterface {
      private final String tag;
      private final ContentInterface delegate;
  
      public LoggingContentInterface(String tag, ContentInterface delegate) {
          this.tag = tag;
          this.delegate = delegate;
      }
  
      private class Logger implements AutoCloseable {
          private final StringBuilder sb = new StringBuilder();
  
          public Logger(String method, Object... args) {
              // First, force-unparcel any bundles so we can log them
              for (Object arg : args) {
                  if (arg instanceof Bundle) {
                      ((Bundle) arg).size();
                  }
              }
  
              sb.append("callingUid=").append(Binder.getCallingUid()).append(' ');
              sb.append(method);
              sb.append('(').append(deepToString(args)).append(')');
          }
  
          private String deepToString(Object value) {
              if (value != null && value.getClass().isArray()) {
                  return Arrays.deepToString((Object[]) value);
              } else {
                  return String.valueOf(value);
              }
          }
  
          public <T> T setResult(T res) {
              if (res instanceof Cursor) {
                  sb.append('\n');
                  DatabaseUtils.dumpCursor((Cursor) res, sb);
              } else {
                  sb.append(" = ").append(deepToString(res));
              }
              return res;
          }
  
          @Override
          public void close() {
              Log.v(tag, sb.toString());
          }
      }
  
      @Override
      public @Nullable Cursor query(@NonNull Uri uri, @Nullable String[] projection,
              @Nullable Bundle queryArgs, @Nullable CancellationSignal cancellationSignal)
              throws RemoteException {
          try (Logger l = new Logger("query", uri, projection, queryArgs, cancellationSignal)) {
              try {
                  return l.setResult(delegate.query(uri, projection, queryArgs, cancellationSignal));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public @Nullable String getType(@NonNull Uri uri) throws RemoteException {
          try (Logger l = new Logger("getType", uri)) {
              try {
                  return l.setResult(delegate.getType(uri));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public @Nullable String[] getStreamTypes(@NonNull Uri uri, @NonNull String mimeTypeFilter)
              throws RemoteException {
          try (Logger l = new Logger("getStreamTypes", uri, mimeTypeFilter)) {
              try {
                  return l.setResult(delegate.getStreamTypes(uri, mimeTypeFilter));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public @Nullable Uri canonicalize(@NonNull Uri uri) throws RemoteException {
          try (Logger l = new Logger("canonicalize", uri)) {
              try {
                  return l.setResult(delegate.canonicalize(uri));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public @Nullable Uri uncanonicalize(@NonNull Uri uri) throws RemoteException {
          try (Logger l = new Logger("uncanonicalize", uri)) {
              try {
                  return l.setResult(delegate.uncanonicalize(uri));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public boolean refresh(@NonNull Uri uri, @Nullable Bundle args,
              @Nullable CancellationSignal cancellationSignal) throws RemoteException {
          try (Logger l = new Logger("refresh", uri, args, cancellationSignal)) {
              try {
                  return l.setResult(delegate.refresh(uri, args, cancellationSignal));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public @Nullable Uri insert(@NonNull Uri uri, @Nullable ContentValues initialValues)
              throws RemoteException {
          try (Logger l = new Logger("insert", uri, initialValues)) {
              try {
                  return l.setResult(delegate.insert(uri, initialValues));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public int bulkInsert(@NonNull Uri uri, @NonNull ContentValues[] initialValues)
              throws RemoteException {
          try (Logger l = new Logger("bulkInsert", uri, initialValues)) {
              try {
                  return l.setResult(delegate.bulkInsert(uri, initialValues));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public int delete(@NonNull Uri uri, @Nullable String selection,
              @Nullable String[] selectionArgs) throws RemoteException {
          try (Logger l = new Logger("delete", uri, selection, selectionArgs)) {
              try {
                  return l.setResult(delegate.delete(uri, selection, selectionArgs));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public int update(@NonNull Uri uri, @Nullable ContentValues values, @Nullable String selection,
              @Nullable String[] selectionArgs) throws RemoteException {
          try (Logger l = new Logger("update", uri, values, selection, selectionArgs)) {
              try {
                  return l.setResult(delegate.update(uri, values, selection, selectionArgs));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public @Nullable ParcelFileDescriptor openFile(@NonNull Uri uri, @NonNull String mode,
              @Nullable CancellationSignal signal) throws RemoteException, FileNotFoundException {
          try (Logger l = new Logger("openFile", uri, mode, signal)) {
              try {
                  return l.setResult(delegate.openFile(uri, mode, signal));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public @Nullable AssetFileDescriptor openAssetFile(@NonNull Uri uri, @NonNull String mode,
              @Nullable CancellationSignal signal) throws RemoteException, FileNotFoundException {
          try (Logger l = new Logger("openAssetFile", uri, mode, signal)) {
              try {
                  return l.setResult(delegate.openAssetFile(uri, mode, signal));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public @Nullable AssetFileDescriptor openTypedAssetFile(@NonNull Uri uri,
              @NonNull String mimeTypeFilter, @Nullable Bundle opts,
              @Nullable CancellationSignal signal) throws RemoteException, FileNotFoundException {
          try (Logger l = new Logger("openTypedAssetFile", uri, mimeTypeFilter, opts, signal)) {
              try {
                  return l.setResult(delegate.openTypedAssetFile(uri, mimeTypeFilter, opts, signal));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public @NonNull ContentProviderResult[] applyBatch(@NonNull String authority,
              @NonNull ArrayList<ContentProviderOperation> operations)
              throws RemoteException, OperationApplicationException {
          try (Logger l = new Logger("applyBatch", authority, operations)) {
              try {
                  return l.setResult(delegate.applyBatch(authority, operations));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  
      @Override
      public @Nullable Bundle call(@NonNull String authority, @NonNull String method,
              @Nullable String arg, @Nullable Bundle extras) throws RemoteException {
          try (Logger l = new Logger("call", authority, method, arg, extras)) {
              try {
                  return l.setResult(delegate.call(authority, method, arg, extras));
              } catch (Exception res) {
                  l.setResult(res);
                  throw res;
              }
          }
      }
  }
  