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/*
* Copyright (C) 2016 AnySoftKeyboard
*
* 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.
*/
import java.io.*;
/** Compresses a list of words and frequencies into a tree structured binary dictionary. */
class BinaryDictionaryResourceNormalizer {
private static final int DICT_FILE_CHUNK_SIZE = 1000 * 1000;
private final File tempOutputFile;
private final File outputFolder;
private final File dict_id_array;
private final String mPrefix;
public BinaryDictionaryResourceNormalizer(
File tempOutputFile, File outputFolder, File dict_id_array, String prefix) {
this.tempOutputFile = tempOutputFile;
this.outputFolder = outputFolder;
this.dict_id_array = dict_id_array;
mPrefix = prefix;
}
public void writeDictionaryIdsResource() throws IOException {
splitOutputFile(tempOutputFile, outputFolder);
}
private int splitOutputFile(final File tempOutputFile, final File outputFolder)
throws IOException {
// output should be words_1.dict....words_n.dict
InputStream inputStream = new FileInputStream(tempOutputFile);
int file_postfix = 0;
int current_output_file_size = 0;
byte[] buffer = new byte[4 * 1024];
OutputStream outputStream = null;
int read = 0;
XmlWriter xml = new XmlWriter(dict_id_array);
xml.writeEntity("resources");
xml.writeEntity("array").writeAttribute("name", mPrefix + "_words_dict_array");
while ((read = inputStream.read(buffer)) > 0) {
if (outputStream != null && current_output_file_size >= DICT_FILE_CHUNK_SIZE) {
outputStream.flush();
outputStream.close();
outputStream = null;
}
if (outputStream == null) {
file_postfix++;
xml.writeEntity("item")
.writeText("@raw/" + mPrefix + "_words_" + file_postfix)
.endEntity();
current_output_file_size = 0;
File chunkFile =
new File(outputFolder, mPrefix + "_words_" + file_postfix + ".dict");
outputStream = new FileOutputStream(chunkFile);
System.out.println("Writing to dict file " + chunkFile.getAbsolutePath());
}
outputStream.write(buffer, 0, read);
current_output_file_size += read;
}
xml.endEntity();
xml.endEntity();
xml.close();
inputStream.close();
if (outputStream != null) {
outputStream.flush();
outputStream.close();
}
System.out.println("Done. Wrote " + file_postfix + " files.");
return file_postfix;
}
}
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