1  /*
2   * Copyright (C) 2009 The Android Open Source Project
3   *
4   * Licensed under the Apache License, Version 2.0 (the "License");
5   * you may not use this file except in compliance with the License.
6   * You may obtain a copy of the License at
7   *
8   *      http://www.apache.org/licenses/LICENSE-2.0
9   *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package android.gesture;
18  
19  import android.annotation.NonNull;
20  import android.annotation.RawRes;
21  import android.os.ParcelFileDescriptor;
22  import android.util.Log;
23  import static android.gesture.GestureConstants.*;
24  import android.content.Context;
25  
26  import java.io.File;
27  import java.io.FileDescriptor;
28  import java.io.FileOutputStream;
29  import java.io.IOException;
30  import java.io.FileInputStream;
31  import java.io.InputStream;
32  import java.lang.ref.WeakReference;
33  
34  public final class GestureLibraries {
GestureLibraries()35      private GestureLibraries() {
36      }
37  
fromFile(String path)38      public static GestureLibrary fromFile(String path) {
39          return fromFile(new File(path));
40      }
41  
fromFile(File path)42      public static GestureLibrary fromFile(File path) {
43          return new FileGestureLibrary(path);
44      }
45  
46      @NonNull
fromFileDescriptor(@onNull ParcelFileDescriptor pfd)47      public static GestureLibrary fromFileDescriptor(@NonNull ParcelFileDescriptor pfd) {
48          return new FileGestureLibrary(pfd.getFileDescriptor());
49      }
50  
fromPrivateFile(Context context, String name)51      public static GestureLibrary fromPrivateFile(Context context, String name) {
52          return fromFile(context.getFileStreamPath(name));
53      }
54  
fromRawResource(Context context, @RawRes int resourceId)55      public static GestureLibrary fromRawResource(Context context, @RawRes int resourceId) {
56          return new ResourceGestureLibrary(context, resourceId);
57      }
58  
59      private static class FileGestureLibrary extends GestureLibrary {
60          // Either a file or an fd is used
61          private final File mPath;
62          private final FileDescriptor mFd;
63  
FileGestureLibrary(File path)64          public FileGestureLibrary(File path) {
65              mPath = path;
66              mFd = null;
67          }
68  
FileGestureLibrary(FileDescriptor fd)69          public FileGestureLibrary(FileDescriptor fd) {
70              mPath = null;
71              mFd = fd;
72          }
73  
74          /**
75           * <p>If this GestureLibrary was created using a FileDescriptor,
76           * this method will always return false.
77           */
78          @Override
isReadOnly()79          public boolean isReadOnly() {
80              if (mPath != null) {
81                  return !mPath.canWrite();
82              }
83              return false;
84          }
85  
save()86          public boolean save() {
87              if (!mStore.hasChanged()) return true;
88              boolean result = false;
89  
90              if (mPath != null) {
91                  final File file = mPath;
92  
93                  final File parentFile = file.getParentFile();
94                  if (!parentFile.exists()) {
95                      if (!parentFile.mkdirs()) {
96                          return false;
97                      }
98                  }
99  
100                  try {
101                      //noinspection ResultOfMethodCallIgnored
102                      file.createNewFile();
103                      mStore.save(new FileOutputStream(file), true);
104                      result = true;
105                  } catch (IOException e) {
106                      Log.d(LOG_TAG, "Could not save the gesture library in " + mPath, e);
107                  }
108              } else {
109                  try {
110                      mStore.save(new FileOutputStream(mFd), true);
111                      result = true;
112                  } catch (IOException e) {
113                      Log.d(LOG_TAG, "Could not save the gesture library", e);
114                  }
115              }
116              return result;
117          }
118  
load()119          public boolean load() {
120              boolean result = false;
121              if (mPath != null) {
122                  final File file = mPath;
123                  if (file.exists() && file.canRead()) {
124                      try {
125                          mStore.load(new FileInputStream(file), true);
126                          result = true;
127                      } catch (IOException e) {
128                          Log.d(LOG_TAG, "Could not load the gesture library from " + mPath, e);
129                      }
130                  }
131              } else {
132                  try {
133                      mStore.load(new FileInputStream(mFd), true);
134                      result = true;
135                  } catch (IOException e) {
136                      Log.d(LOG_TAG, "Could not load the gesture library", e);
137                  }
138              }
139  
140              return result;
141          }
142      }
143  
144      private static class ResourceGestureLibrary extends GestureLibrary {
145          private final WeakReference<Context> mContext;
146          private final int mResourceId;
147  
ResourceGestureLibrary(Context context, int resourceId)148          public ResourceGestureLibrary(Context context, int resourceId) {
149              mContext = new WeakReference<Context>(context);
150              mResourceId = resourceId;
151          }
152  
153          @Override
isReadOnly()154          public boolean isReadOnly() {
155              return true;
156          }
157  
save()158          public boolean save() {
159              return false;
160          }
161  
load()162          public boolean load() {
163              boolean result = false;
164              final Context context = mContext.get();
165              if (context != null) {
166                  final InputStream in = context.getResources().openRawResource(mResourceId);
167                  try {
168                      mStore.load(in, true);
169                      result = true;
170                  } catch (IOException e) {
171                      Log.d(LOG_TAG, "Could not load the gesture library from raw resource " +
172                              context.getResources().getResourceName(mResourceId), e);
173                  }
174              }
175  
176              return result;
177          }
178      }
179  }
180