get Annotations Map By Fields - Java java.lang.annotation

Java examples for java.lang.annotation:Field Annotation

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Description

get Annotations Map By Fields

Demo Code


//package com.java2s;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Main {
    public static Map<Field, Annotation[]> getAnnotationsMapByFields(
            Field[] fields) {//  www .jav a  2 s.  c o m
        Map<Field, Annotation[]> map = new HashMap<Field, Annotation[]>();
        for (Field field : fields) {
            Annotation[] annotations = getAnnotationsByField(field);
            if (annotations.length > 0) {
                map.put(field, annotations);
            }
        }
        return map;
    }

    @SuppressWarnings("unchecked")
    public static <T> Map<String, T[]> getAnnotationsMapByFields(
            Field[] fields, Class<T> annotationType) {
        Map<String, T[]> map = new HashMap<String, T[]>();
        for (Field field : fields) {
            Annotation[] annotations = getAnnotationsByField(field);
            if (annotations.length > 0) {
                List<T> list = new ArrayList<T>();
                for (Annotation annotation : annotations) {
                    if (annotation.annotationType().getName()
                            .equals(annotationType.getName())) {
                        list.add((T) annotation);
                    }
                }
                if (list.size() > 0) {
                    map.put(field.getName(), (T[]) list.toArray());
                }
            }
        }
        return map;
    }

    public static Annotation[] getAnnotationsByField(Field field) {
        return field.getDeclaredAnnotations();
    }
}

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