Modify the base gestures API to use streams instead of files. Adds new wrappers to easily load/save gestures from files, resources, etc. Do the same for the letters recognizer.

1 files changed, 139 insertions, 0 deletions

diff --git a/core/java/android/gesture/GestureLibraries.java b/core/java/android/gesture/GestureLibraries.java
new file mode 100644
index 0000000..2ce7a8e
--- /dev/null
+++ b/core/java/android/gesture/GestureLibraries.java
@@ -0,0 +1,139 @@
+/*
+ * 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.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, 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() {
+            final File file = mPath;
+            if (!file.canWrite()) return false;
+
+            if (!file.getParentFile().exists()) {
+                if (!file.getParentFile().mkdirs()) {
+                    return false;
+                }
+            }
+
+            boolean result = false;
+            try {
+                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;
+        }
+    }
+}