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/*
* 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.NonNull;
import android.annotation.RawRes;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import static android.gesture.GestureConstants.*;
import android.content.Context;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
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);
}
@NonNull
public static GestureLibrary fromFileDescriptor(@NonNull ParcelFileDescriptor pfd) {
return new FileGestureLibrary(pfd.getFileDescriptor());
}
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 {
// Either a file or an fd is used
private final File mPath;
private final FileDescriptor mFd;
public FileGestureLibrary(File path) {
mPath = path;
mFd = null;
}
public FileGestureLibrary(FileDescriptor fd) {
mPath = null;
mFd = fd;
}
/**
* <p>If this GestureLibrary was created using a FileDescriptor,
* this method will always return false.
*/
@Override
public boolean isReadOnly() {
if (mPath != null) {
return !mPath.canWrite();
}
return false;
}
public boolean save() {
if (!mStore.hasChanged()) return true;
boolean result = false;
if (mPath != null) {
final File file = mPath;
final File parentFile = file.getParentFile();
if (!parentFile.exists()) {
if (!parentFile.mkdirs()) {
return false;
}
}
try {
//noinspection ResultOfMethodCallIgnored
file.createNewFile();
mStore.save(new FileOutputStream(file), true);
result = true;
} catch (IOException e) {
Log.d(LOG_TAG, "Could not save the gesture library in " + mPath, e);
}
} else {
try {
mStore.save(new FileOutputStream(mFd), true);
result = true;
} catch (IOException e) {
Log.d(LOG_TAG, "Could not save the gesture library", e);
}
}
return result;
}
public boolean load() {
boolean result = false;
if (mPath != null) {
final File file = mPath;
if (file.exists() && file.canRead()) {
try {
mStore.load(new FileInputStream(file), true);
result = true;
} catch (IOException e) {
Log.d(LOG_TAG, "Could not load the gesture library from " + mPath, e);
}
}
} else {
try {
mStore.load(new FileInputStream(mFd), true);
result = true;
} catch (IOException e) {
Log.d(LOG_TAG, "Could not load the gesture library", 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;
}
}
}
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