FileIOUtil.java

/*
 * Copyright (C) 2016 Nishant Srivastava
 *
 * 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 github.nisrulz.androidutils.fileio;

import android.content.Context;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.HashMap;

/**
 * The type File io util.
 */
public class FileIOUtil {

    /**
     * Load hash map from file hash map.
     *
     * @param context  the context
     * @param fileName the file name
     * @return the hash map
     */
    public static HashMap<String, String> loadHashMapFromFile(Context context, String fileName) {
        String filePath = context.getFilesDir().getPath() + "/" + fileName;
        File f = new File(filePath);
        try {
            if (f.exists()) {

                ObjectInputStream objISt = new ObjectInputStream(new FileInputStream(f));

                HashMap<String, String> h = (HashMap<String, String>) objISt.readObject();
                objISt.close();
                System.out.println(h.get("c"));
                return h;
            } else {
                System.out.println("FILE DOES NOT EXIST !!");
            }
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }

        return new HashMap<>(1);
    }

    /**
     * Save hash map to file.
     *
     * @param context  the context
     * @param fileName the file name
     * @param h        the h
     */
    public static void saveHashMapToFile(Context context, String fileName,
            HashMap<String, String> h) {
        String filePath = context.getFilesDir().getPath() + "/" + fileName;
        File f = new File(filePath);
        try {
            if (!f.exists()) {
                f.createNewFile();
            }

            ObjectOutputStream objOSt = new ObjectOutputStream(new FileOutputStream(f));
            objOSt.writeObject(h);
            objOSt.flush();
            objOSt.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private FileIOUtil() {
        throw new UnsupportedOperationException(
                "Should not create instance of Util class. Please use as static..");
    }
}