tests/utils/SleepUtils/WakeLoopService/src/android/test/wakeuploop/FileUtil.java

/*
 * Copyright (C) 2014 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.test.wakeuploop;

import android.util.Log;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class FileUtil {

    private static FileUtil sInst = null;
    private static DateFormat sDateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");

    private FileUtil() {};

    public static FileUtil get() {
        if (sInst == null) {
            sInst = new FileUtil();
        }
        return sInst;
    }

    public void writeDateToFile(File file) {
        try {
            FileOutputStream fos = new FileOutputStream(file);
            fos.write(sDateFormat.format(new Date()).getBytes());
            fos.write('\n');
            fos.flush();
            fos.close();
        } catch (IOException ioe) {
            Log.e("FileUtil", "exception writing date to file", ioe);
        }
    }
}