content: /*
   * Copyright (C) 2009 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.gesture;
  
  import android.annotation.RawRes;
  import android.util.Log;
  import static android.gesture.GestureConstants.*;
  import android.content.Context;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.FileInputStream;
  import java.io.InputStream;
  import java.lang.ref.WeakReference;
  
  public final class GestureLibraries {
      private GestureLibraries() {
      }
  
      public static GestureLibrary fromFile(String path) {
          return fromFile(new File(path));
      }
  
      public static GestureLibrary fromFile(File path) {
          return new FileGestureLibrary(path);
      }
  
      public static GestureLibrary fromPrivateFile(Context context, String name) {
          return fromFile(context.getFileStreamPath(name));
      }
  
      public static GestureLibrary fromRawResource(Context context, @RawRes int resourceId) {
          return new ResourceGestureLibrary(context, resourceId);
      }
  
      private static class FileGestureLibrary extends GestureLibrary {
          private final File mPath;
  
          public FileGestureLibrary(File path) {
              mPath = path;
          }
  
          @Override
          public boolean isReadOnly() {
              return !mPath.canWrite();
          }
  
          public boolean save() {
              if (!mStore.hasChanged()) return true;
  
              final File file = mPath;
  
              final File parentFile = file.getParentFile();
              if (!parentFile.exists()) {
                  if (!parentFile.mkdirs()) {
                      return false;
                  }
              }
  
              boolean result = false;
              try {
                  //noinspection ResultOfMethodCallIgnored
                  file.createNewFile();
                  mStore.save(new FileOutputStream(file), true);
                  result = true;
              } catch (FileNotFoundException e) {
                  Log.d(LOG_TAG, "Could not save the gesture library in " + mPath, e);
              } catch (IOException e) {
                  Log.d(LOG_TAG, "Could not save the gesture library in " + mPath, e);
              }
  
              return result;
          }
  
          public boolean load() {
              boolean result = false;
              final File file = mPath;
              if (file.exists() && file.canRead()) {
                  try {
                      mStore.load(new FileInputStream(file), true);
                      result = true;
                  } catch (FileNotFoundException e) {
                      Log.d(LOG_TAG, "Could not load the gesture library from " + mPath, e);
                  } catch (IOException e) {
                      Log.d(LOG_TAG, "Could not load the gesture library from " + mPath, e);
                  }
              }
  
              return result;
          }
      }
  
      private static class ResourceGestureLibrary extends GestureLibrary {
          private final WeakReference<Context> mContext;
          private final int mResourceId;
  
          public ResourceGestureLibrary(Context context, int resourceId) {
              mContext = new WeakReference<Context>(context);
              mResourceId = resourceId;
          }
  
          @Override
          public boolean isReadOnly() {
              return true;
          }
  
          public boolean save() {
              return false;
          }
  
          public boolean load() {
              boolean result = false;
              final Context context = mContext.get();
              if (context != null) {
                  final InputStream in = context.getResources().openRawResource(mResourceId);
                  try {
                      mStore.load(in, true);
                      result = true;
                  } catch (IOException e) {
                      Log.d(LOG_TAG, "Could not load the gesture library from raw resource " +
                              context.getResources().getResourceName(mResourceId), e);
                  }
              }
  
              return result;
          }
      }
  }
  