cc.voox.graphql.utils.BeanUtil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of graphql-spring-boot-starter Show documentation

graphql tool for java

The newest version!

package cc.voox.graphql.utils;

import org.springframework.util.Assert;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

public final class BeanUtil {
    public static Field getDeclaredField(final Class clazz,
                                         final String fieldName) {
        Assert.notNull(clazz);
        Assert.hasText(fieldName);
        for (Class superClass = clazz; superClass != Object.class; superClass = superClass
                .getSuperclass()) {
            try {
                return superClass.getDeclaredField(fieldName);
            } catch (NoSuchFieldException e) {
            }
        }
        return null;
    }

    protected static Field getDeclaredField(final Object object,
                                            final String fieldName) {
        Assert.notNull(object);
        return getDeclaredField(object.getClass(), fieldName);
    }

    protected static void makeAccessible(Field field) {
        if (!Modifier.isPublic(field.getModifiers())
                || !Modifier.isPublic(field.getDeclaringClass().getModifiers())) {
            field.setAccessible(true);
        }
    }

    public static Object getFieldValue(final Object object,
                                       final String fieldName) {
        Field field = getDeclaredField(object, fieldName);

        if (field == null)
            throw new IllegalArgumentException("Could not find field ["
                    + fieldName + "] on target [" + object + "]");

        makeAccessible(field);

        Object result = null;
        try {
            result = field.get(object);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        return result;
    }
}