Java Reflection Field Find findField(Class clazz, String name)

Description

Search a java.lang.reflect.Field given its class and name

License

Apache License

Parameter

Parameter	Description
clazz	a parameter
name	a parameter

Declaration

public static Field findField(Class<?> clazz, String name) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.lang.reflect.Field;

public class Main {
    /**//from  ww w . ja va 2 s.  c om
     * Search a {@link java.lang.reflect.Field} given its class and name
     * 
     * @param clazz
     * @param name
     * @return
     */
    public static Field findField(Class<?> clazz, String name) {
        return findField(clazz, name, null);
    }

    /**
     * Search a {@link java.lang.reflect.Field} given its class and name
     * 
     * @param clazz
     * @param name
     * @param type
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static Field findField(Class<?> clazz, String name, Class<?> type) {
        validateField(clazz, name, type);
        Class searchType = clazz;
        while ((!(Object.class.equals(searchType))) && (searchType != null)) {
            Field[] fields = searchType.getDeclaredFields();
            for (Field field : fields) {
                if ((((name == null) || (name.equals(field.getName()))))
                        && (((type == null) || (type.equals(field.getType()))))) {
                    return field;
                }
            }
            searchType = searchType.getSuperclass();
        }
        return null;
    }

    private static void validateField(Class<?> clazz, String name, Class<?> type) {
        if (clazz == null) {
            throw new IllegalArgumentException("Class must not be null");
        }
        if (!((name != null) || (type != null))) {
            throw new IllegalArgumentException("Either name or type of the field must be specified");
        }
    }
}

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