get Parameter Annotations - Java java.lang.annotation

Java examples for java.lang.annotation:Annotation Parameter

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Description

get Parameter Annotations

Demo Code


//package com.java2s;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static <A extends Annotation> List<A> getParameterAnnotations(
            Constructor<?> constructor, Class<A> annotation) {

        List<A> ret = new ArrayList<A>();
        Annotation[][] parameterAnnotations = constructor
                .getParameterAnnotations();

        for (Annotation[] annotations : parameterAnnotations) {
            boolean isAdd = false;
            for (int i = 0; i < annotations.length; i++) {
                Annotation a = annotations[i];
                if (a == null) {
                    continue;
                } else if (annotation.isAssignableFrom(a.getClass()) == true) {
                    @SuppressWarnings("unchecked")
                    A addElement = (A) a;
                    ret.add(addElement);
                    isAdd = true;//  w w w.j  ava2 s .  com
                    break;
                }
            }
            if (isAdd == false) {
                ret.add(null);
            }
        }
        return ret;
    }

    public static Annotation[] getParameterAnnotations(
            Constructor<?> constructor, int paramIndex) {
        return constructor.getParameterAnnotations()[paramIndex];

    }
}

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