Method GetValue

java/lib/src/main/java/io/github/ccxt/Helpers.java:530–584

(Object value2, Object key)

    public Object getValue(Object a, Object b) { return GetValue(a, b); }

    public static Object GetValue(Object value2, Object key) {
        if (value2 == null || key == null) return null;

        // Strings: index access
        if (value2 instanceof String) {
            String str = (String) value2;
            // check if key is int
            if (!(key instanceof Long) && !(key instanceof Integer) && !(key instanceof Double)) {
                return null;
            }
            int idx = toInt(key);
            if (idx < 0 || idx >= str.length()) return null;
            return String.valueOf(str.charAt(idx));
        }

        Object value = value2;
        if (value2.getClass().isArray()) {
            // Convert to List<Object>
            int len = Array.getLength(value2);
            List<Object> list = new ArrayList<>(len);
            for (int i = 0; i < len; i++) list.add(Array.get(value2, i));
            value = list;
        }

        if (value instanceof Map) {
            Map<String, Object> m = (Map<String, Object>) value;
            if (key instanceof String && m.containsKey(key)) {
                return m.get(key);
            }
            return null;
        } else if (value instanceof List) {
            int idx = toInt(key);
            List<?> list = (List<?>) value;
            if (idx < 0 || idx >= list.size()) return null;
            return list.get(idx);
        } else if (key instanceof String) {
            // Try Java field or getter
            String name = (String) key;
            try {
                // Field
                Field f = value.getClass().getField(name);
                f.setAccessible(true);
                return f.get(value2);
            } catch (Exception ignored) {}
            try {
                // Getter
                String mName = "get" + Character.toUpperCase(name.charAt(0)) + name.substring(1);
                Method m = value.getClass().getMethod(mName);
                return m.invoke(value2);
            } catch (Exception ignored) {}
            return null;
        } else {
            return null;
        }
    }

    public static CompletableFuture<List<Object>> promiseAll(Object promisesObj) { return PromiseAll(promisesObj); }