Constructor.java 文件源码

/**
 * Returns an array of arrays that represent the annotations on the formal
 * parameters, in declaration order, of the method represented by
 * this {@code Constructor} object. (Returns an array of length zero if the
 * underlying method is parameterless.  If the method has one or more
 * parameters, a nested array of length zero is returned for each parameter
 * with no annotations.) The annotation objects contained in the returned
 * arrays are serializable.  The caller of this method is free to modify
 * the returned arrays; it will have no effect on the arrays returned to
 * other callers.
 *
 * @return an array of arrays that represent the annotations on the formal
 *    parameters, in declaration order, of the method represented by this
 *    Constructor object
 * @since 1.5
 */
public Annotation[][] getParameterAnnotations() {
    int numParameters = parameterTypes.length;
    if (parameterAnnotations == null)
        return new Annotation[numParameters][0];

    Annotation[][] result = AnnotationParser.parseParameterAnnotations(
        parameterAnnotations,
        sun.misc.SharedSecrets.getJavaLangAccess().
            getConstantPool(getDeclaringClass()),
        getDeclaringClass());
    if (result.length != numParameters) {
        Class<?> declaringClass = getDeclaringClass();
        if (declaringClass.isEnum() ||
            declaringClass.isAnonymousClass() ||
            declaringClass.isLocalClass() )
            ; // Can't do reliable parameter counting
        else {
            if (!declaringClass.isMemberClass() || // top-level
                // Check for the enclosing instance parameter for
                // non-static member classes
                (declaringClass.isMemberClass() &&
                 ((declaringClass.getModifiers() & Modifier.STATIC) == 0)  &&
                 result.length + 1 != numParameters) ) {
                throw new AnnotationFormatError(
                          "Parameter annotations don't match number of parameters");
            }
        }
    }
    return result;
}