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/*
* Copyright (C) 2011 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 com.android.inputmethod.latin;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.util.Log;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
/**
* Helper class to get the address of a mmap'able dictionary file.
*/
class BinaryDictionaryGetter {
/**
* Used for Log actions from this class
*/
private static final String TAG = BinaryDictionaryGetter.class.getSimpleName();
// Prevents this from being instantiated
private BinaryDictionaryGetter() {}
/**
* Returns a file address from a resource, or null if it cannot be opened.
*/
private static AssetFileAddress loadFallbackResource(Context context, int fallbackResId) {
final AssetFileDescriptor afd = context.getResources().openRawResourceFd(fallbackResId);
if (afd == null) {
Log.e(TAG, "Found the resource but cannot read it. Is it compressed? resId="
+ fallbackResId);
return null;
}
return AssetFileAddress.makeFromFileNameAndOffset(
context.getApplicationInfo().sourceDir, afd.getStartOffset(), afd.getLength());
}
/**
* Returns a list of file addresses for a given locale, trying relevant methods in order.
*
* Tries to get binary dictionaries from various sources, in order:
* - Uses a private method of getting a private dictionaries, as implemented by the
* PrivateBinaryDictionaryGetter class.
* If that fails:
* - Uses a content provider to get a public dictionary set, as per the protocol described
* in BinaryDictionaryFileDumper.
* If that fails:
* - Gets a file name from the fallback resource passed as an argument.
* If that fails:
* - Returns null.
* @return The address of a valid file, or null.
*/
public static List<AssetFileAddress> getDictionaryFiles(Locale locale, Context context,
int fallbackResId) {
// Try first to query a private package signed the same way for private files.
final List<AssetFileAddress> privateFiles =
PrivateBinaryDictionaryGetter.getDictionaryFiles(locale, context);
if (null != privateFiles) {
return privateFiles;
} else {
try {
// If that was no-go, try to find a publicly exported dictionary.
return BinaryDictionaryFileDumper.getDictSetFromContentProvider(locale, context);
} catch (FileNotFoundException e) {
Log.e(TAG, "Unable to create dictionary file from provider for locale "
+ locale.toString() + ": falling back to internal dictionary");
return Arrays.asList(loadFallbackResource(context, fallbackResId));
} catch (IOException e) {
Log.e(TAG, "Unable to read source data for locale "
+ locale.toString() + ": falling back to internal dictionary");
return Arrays.asList(loadFallbackResource(context, fallbackResId));
}
}
}
}
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