IoUtils helper methods

IoUtils.java

import android.content.Context;

import com.squareup.okhttp.internal.io.FileSystem;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import okio.BufferedSource;
import okio.Okio;
import timber.log.Timber;
/**
 * Utils for I/O operations.
 * <p/>
 * Created by Tomek on 09/06/15.
 */
public class IoUtils {

    private static final String UTF_8 = "UTF-8";
    private static final String MARKDOWN_ASSET_ROOT = "markdown";

    /**
     * Returns String representation of a file from assets folder.
     *
     * @param context
     * @param fileName
     */
    public static String readStringFromAssets(Context context, final String fileName) {

        String outputString = null;
        InputStream inputStream = null;
        try {
            inputStream = context.getAssets().open(fileName);
            int size = inputStream.available();
            byte[] outputBuffer = new byte[size];
            int readBytesSize = inputStream.read(outputBuffer);
            outputString = new String(outputBuffer, UTF_8);
            inputStream.close();
        } catch (IOException e) {
            Timber.e("Error reading file:%s", fileName);
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    Timber.e("Cannot close inputStream!");
                }
            }
        }

        return outputString;
    }

    /**
     * Returns String content of a Markdown file.
     *
     * @param context        app context
     * @param markdownFolder name of the folder type e.g. "Folder1"
     * @param fileName       actual page file name
     */
    public static String readMarkdownAssetString(final Context context, final String markdownFolder, final String fileName) {
        return readStringFromAssets(context,
                String.format("%s%s%s%s%s", MARKDOWN_ASSET_ROOT, File.separator, markdownFolder, File.separator,
                        fileName));
    }

    /**
     * Reads file and returns a String.
     *
     * @param file
     * @throws IOException
     */
    public static String readFile(File file) throws IOException {
        BufferedSource source = Okio.buffer(FileSystem.SYSTEM.source(file));
        String result = source.readUtf8();
        source.close();
        return result;
    }


}