Kodestil

We follow Google’s Java Style Guidelines with a few additions and modifications, which are described herein.

Tips

You can use our code styles for Eclipse or IntelliJ IDEA to let your IDE format the code correctly for you. Visit Sponge Code Styles.

• Linjeslutt

  • Use Unix line endings when committing (\n)

    • Windows-brukere av Git kan bruke git config --global core.autocrlf true for å la Git konvertere dem automatisk.

• Kolonnebredde

  • 80 for Javadocs

  • 150 for kode

  • Du må gjerne la teksten gå over flere linjer dersom det gjør det mer lesbart.

• Innrykk

  • Bruk 4 mellomrom for innrykk, ikke bruk 2 mellomrom

• Vertikalt mellomrom

  • Plasser en tom linje før det første medlemmet av en klasse, et grensesnit, enum, osv. (altså etter class Example {), samt etter det siste medlemmet

• Filoverskrifter

  • File headers must contain the license headers for the project. Use the updateLicenses Gradle task to add them automatically

• Importer

  • Imports must be grouped in the following order, where each group is separated by an empty line

    • Static imports

    • All other imports

    • java imports

    • javax imports

  • This differs from Google’s style in that imports are not grouped by top-level package, they are all grouped as one.

• Unntak

  • For unntak som skal ignoreres, gi unntaksvariabelen navnet ignored

• Field accesses

  • Qualify all field accesses with this

• Javadocs

  • Ikke bruk @author

  • Pakk inn nye avsnitt i <p> og </p>

  • Den første bokstaven i beskrivelsene i hver @-klause bør være stor, altså @param navn Spilleren som affiseres. Ingen punktum.

• End of file

  • Each file should end with an empty line

Kodekonvensjoner

• Use Optionals instead of returning null in the API

• Metodeparametere som godtar null må annoteres med @Nullable (fra javax.*), alle metoder og parametere er @Nonnull som standard.

• API: Use java.util.Objects.requireNonNull for null checks and ifs for argument checking.

• Impl: Use Google Preconditions for null- and argument checking.

Kjernen

Selv om vi oppfordrer deg til å lese Google sine Java-konvensjoner godt, er de to ganske lange dokumenter. For å få deg fort i gang, her er et eksempel på riktig formatert kode:

/*
* This file is part of Sponge, licensed under the MIT License (MIT).
*
* Copyright (c) SpongePowered <https://www.spongepowered.org>
* Copyright (c) contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.spongepowered.example;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.inject.Inject;
import org.slf4j.Logger;

import java.util.Optional;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;

import javax.annotation.Nullable;

/**
* An example class which generates a new ID based on a specified base string
* and a randomly generated integer.
*
* <p>There is a chance the integer purposely fails to generate, in which case
* you can choose to provide a backup integer.</p>
*/
public class Example {

    private static final long SEED = 4815162342L;

    @Inject
    private Logger logger;

    private final String base;
    private final Random random;

    public Example(String base) {
        checkNotNull(base, "The specified base string cannot be null!");
        this.base = base;
        this.random = ThreadLocalRandom.current();
        this.random.setSeed(SEED);
    }

    /**
    * Generates and returns an ID using the base string specified on creation
    * or the alternative string if specified as well as a randomly generated
    * integer, which purposely fails to generate around 50% of the time.
    *
    * <p>A {@link ThreadLocalRandom} is used to check if the integer should
    * be generated and generates the integer itself if so.</p>
    *
    * @param alternate An alternate base string which will be used if not null
    * @return The generated ID, if available
    */
    public Optional<String> generateId(@Nullable String alternate) {
        if (this.random.nextBoolean()) {
            return Optional.of(alternate == null ? this.base : alternate + " - " + this.random.nextInt());
        }

        return Optional.empty();
    }

    /**
    * Generates and returns an ID using the base string specified on creation,
    * using a randomly generated integer if it was generated successfully, or
    * using the backup integer you specify.
    *
    * <p>A {@link ThreadLocalRandom} is used to check if the integer should
    * be generated and generates the integer itself if so. If it was not
    * generated, that is when your backup integer will be used.</p>
    *
    * @param backup A backup integer to use to create the ID with
    * @return The generated ID using the generated integer or the ID created
    *     using the backup integer specified
    */
    public String generateId(int backup) {
        return generateId(null).orElse(this.base + " - " + backup);
    }

}