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/*
* Copyright (C) 2017 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 androidx.work.integration.testapp.sherlockholmes;
import android.content.Context;
import android.content.res.AssetManager;
import android.support.annotation.NonNull;
import android.util.Log;
import androidx.work.Data;
import androidx.work.OneTimeWorkRequest;
import androidx.work.Worker;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
/**
* A Worker that counts words of length > 3 and stores the results.
*/
public class TextMappingWorker extends Worker {
private static final String INPUT_FILE = "input_file";
private Map<String, Integer> mWordCount = new HashMap<>();
/**
* Creates a {@link OneTimeWorkRequest.Builder} with the necessary arguments.
*
* @param inputFile The input file to process
* @return A {@link OneTimeWorkRequest.Builder} with these arguments
*/
public static OneTimeWorkRequest.Builder create(String inputFile) {
Data input = new Data.Builder()
.putString(INPUT_FILE, inputFile)
.build();
return new OneTimeWorkRequest.Builder(TextMappingWorker.class).setInputData(input);
}
@Override
public @NonNull Result doWork() {
Data input = getInputData();
String inputFileName = input.getString(INPUT_FILE, null);
String outputFileName = "out_" + inputFileName;
AssetManager assetManager = getApplicationContext().getAssets();
InputStream inputStream = null;
Scanner scanner = null;
try {
inputStream = assetManager.open(inputFileName);
scanner = new Scanner(inputStream);
while (scanner.hasNext()) {
String word = scanner.next();
if (word.length() > 3) {
int count = 1;
if (mWordCount.containsKey(word)) {
count = mWordCount.get(word) + 1;
}
mWordCount.put(word, count);
}
}
} catch (IOException e) {
return Result.FAILURE;
} finally {
if (scanner != null) {
scanner.close();
}
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
// Do nothing.
}
}
}
FileOutputStream fileOutputStream = null;
DataOutputStream dataOutputStream = null;
try {
fileOutputStream = getApplicationContext()
.openFileOutput(outputFileName, Context.MODE_PRIVATE);
dataOutputStream = new DataOutputStream(fileOutputStream);
for (Map.Entry<String, Integer> entry : mWordCount.entrySet()) {
dataOutputStream.writeUTF(entry.getKey());
dataOutputStream.writeInt(entry.getValue());
}
} catch (IOException e) {
return Result.FAILURE;
} finally {
if (dataOutputStream != null) {
try {
dataOutputStream.close();
} catch (IOException e) {
// Do nothing.
}
}
if (fileOutputStream != null) {
try {
fileOutputStream.close();
} catch (IOException e) {
// Do nothing.
}
}
}
setOutputData(new Data.Builder().putString(INPUT_FILE, outputFileName).build());
Log.d("Map", "Mapping finished for " + inputFileName);
return Result.SUCCESS;
}
}
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