XmlEnumUtils.java 文件源码

private static Method getConversionMethod(Class cls) {
    // Look for forName method that is generated by JAXB.
    Method m = fromValueMethod(cls, String.class);
    if (m != null) {
        return m;
    }

    // If cannot find forName(String) then look for @XmlEnum value
    if (log.isDebugEnabled()) {
        log.debug("try looking for @XmlEnum ");
    }
    XmlEnum xmlEnum = (XmlEnum)
        cls.getAnnotation(XmlEnum.class);
    if (xmlEnum != null) {
        Class argClass = xmlEnum.value();
        m = fromValueMethod(cls, argClass);
        if (m !=null) {
            return m;
        }
        Class primitiveClass = getPrimitiveClass(argClass);
        if (primitiveClass != null) {
            m = fromValueMethod(cls, primitiveClass);
            if (m != null) {
                return m;
            }
        }
    }

    // Look for valueOf(String) method
    if (log.isDebugEnabled()) {
        log.debug("try looking for valueOf method ");
    }
    m = valueOfMethod(cls);
    if (m != null) {
        return m;
    }

    throw new IllegalArgumentException();
}