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Improved version of the DBus-Java library provided by freedesktop.org (https://dbus.freedesktop.org/doc/dbus-java/).

There is a newer version: 5.1.0

package org.freedesktop.dbus;

import java.lang.reflect.Field;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import org.freedesktop.dbus.annotations.Position;

/**
 * This class is the super class of both Structs and Tuples
 * and holds common methods.
 */
public abstract class Container {
    private static Map typecache = new HashMap<>();

    static void putTypeCache(Type k, Type[] v) {
        typecache.put(k, v);
    }

    static Type[] getTypeCache(Type k) {
        return typecache.get(k);
    }

    private Object[] parameters = null;

    Container() {
    }

    private void setup() {
        Field[] fs = getClass().getDeclaredFields();
        Object[] args = new Object[fs.length];

        int diff = 0;
        for (Field f : fs) {
            Position p = f.getAnnotation(Position.class);
            f.setAccessible(true);

            if (null == p) {
                diff++;
                continue;
            }
            try {
                args[p.value()] = f.get(this);
            } catch (IllegalAccessException exIa) {
            }
        }

        this.parameters = new Object[args.length - diff];
        System.arraycopy(args, 0, parameters, 0, parameters.length);
    }

    /**
    * Returns the struct contents in order.
    * @return object array
    */
    public final Object[] getParameters() {
        if (null != parameters) {
            return parameters;
        }
        setup();
        return parameters;
    }

    /** Returns this struct as a string. */
    @Override
    public final String toString() {
        String s = getClass().getName() + "<";
        if (null == parameters) {
            setup();
        }
        if (0 == parameters.length) {
            return s + ">";
        }
        for (Object o : parameters) {
            s += o + ", ";
        }
        return s.replaceAll(", $", ">");
    }

    @Override
    public final boolean equals(Object other) {
        if (other instanceof Container) {
            Container that = (Container) other;
            if (this.getClass().equals(that.getClass())) {
                return Arrays.equals(this.getParameters(), that.getParameters());
            } else {
                return false;
            }
        } else {
            return false;
        }
    }
}