Class ArchUtils

src/main/java/org/apache/commons/lang3/ArchUtils.java:33–149

Provides methods for identifying the architecture of the current JVM based on the "os.arch" system property. Important: The "os.arch" system property returns the architecture used by the JVM not of the operating system. @since 3.6

 * @since 3.6
 */
public class ArchUtils {

    private static final Map<String, Processor> ARCH_TO_PROCESSOR;

    static {
        ARCH_TO_PROCESSOR = new HashMap<>();
        init();
    }

    /**
     * Adds the given {@link Processor} with the given key {@link String} to the map.
     *
     * @param key       The key as {@link String}.
     * @param processor The {@link Processor} to add.
     * @throws IllegalStateException If the key already exists.
     */
    private static void addProcessor(final String key, final Processor processor) {
        if (ARCH_TO_PROCESSOR.containsKey(key)) {
            throw new IllegalStateException("Key " + key + " already exists in processor map");
        }
        ARCH_TO_PROCESSOR.put(key, processor);
    }

    /**
     * Adds the given {@link Processor} with the given keys to the map.
     *
     * @param keys      The keys.
     * @param processor The {@link Processor} to add.
     * @throws IllegalStateException If the key already exists.
     */
    private static void addProcessors(final Processor processor, final String... keys) {
        Streams.of(keys).forEach(e -> addProcessor(e, processor));
    }

    /**
     * Gets a {@link Processor} object of the current JVM.
     *
     * <p>
     * Important: The {@code "os.arch"} system property returns the architecture used by the JVM not of the operating system.
     * </p>
     *
     * @return A {@link Processor} when supported, else {@code null}.
     */
    public static Processor getProcessor() {
        return getProcessor(SystemProperties.getOsArch());
    }

    /**
     * Gets a {@link Processor} object the given value {@link String}. The {@link String} must be like a value returned by the {@code "os.arch"} system
     * property.
     *
     * @param value A {@link String} like a value returned by the {@code os.arch} System Property.
     * @return A {@link Processor} when it exists, else {@code null}.
     */
    public static Processor getProcessor(final String value) {
        return ARCH_TO_PROCESSOR.get(value);
    }