Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * QuasselDroid - Quassel client for Android
 * Copyright (C) 2016 Janne Koschinski
 * Copyright (C) 2016 Ken Brge Viktil
 * Copyright (C) 2016 Magnus Fjell
 * Copyright (C) 2016 Martin Sandsmark <martin.sandsmark@kde.org>
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import android.os.Build;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;

public class Main {
    /**
     * Creates a SyncFlush output stream, even if the current device does not support doing so
     * natively.
     *
     * @param rawOut the raw output stream to be wrapped
     * @return The wrapping output stream
     */
    @NonNull
    public static DeflaterOutputStream createDeflaterOutputStream(@Nullable OutputStream rawOut) {
        if (deviceSupportsCompression())
            return new DeflaterOutputStream(rawOut, true);
        else
            return new DeflaterOutputStream(rawOut, createSyncFlushDeflater());
    }

    /**
     * This method is used to check if the device supports SyncFlush
     * <p>
     * As that feature was only added in KitKat, we just check for the device version.
     *
     * @return Does the current device support SyncFlush natively?
     */
    public static boolean deviceSupportsCompression() {
        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
    }

    /**
     * Creates a SyncFlush Deflater for use on pre-KitKat Android
     *
     * @return The modified Deflater, or null if the creation failed
     */
    @Nullable
    private static Deflater createSyncFlushDeflater() {
        Deflater def = new Deflater();
        try {
            Field f = def.getClass().getDeclaredField("flushParm");
            f.setAccessible(true);
            f.setInt(def, 2); // Z_SYNC_FLUSH
        } catch (Exception e) {
            return null;
        }
        return def;
    }
}